| Forum: Radio Mods |
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| Topic: Pro-91 Mod |
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| Pro-91 Mod [message #288] |
Fri, 13 August 2010 03:57 |
 root
Messages: 99
Registered: December 2004 |
Member |
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1. Clear the scanner (2+9)+ power ON.
2. (2+9+SCAN)+ON fills channels
3. 2+9+HOLD fills channels 1-150 with frequencies 144-148.000
4. 2+9+MON or 2+9+0 or 2+9+E put the display in test mode.
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| Topic: Yaesu FT-7800 Mod - Weather Satellite Mod |
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| Yaesu FT-7800 Mod - Weather Satellite Mod [message #285] |
Sun, 01 August 2010 15:01 |
root
Messages: 99
Registered: December 2004 |
Member |
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FT7800 can hear weather satellites NOAA (15, 17, 18 and 19), but getting nice pictures is difficult due to narrow badpass IF filter. This can be "fixed" by inserting a small IF module with no ceramic filter, only a resonant coil on 455 kHz, which allow to get the 30 wide khz audio at the exit point. Insering this module does not alter the transceiver parameters because this new audio signal is collected on a different output point, with no connection with the original receiver.
Pictures 1 and 2 shows the connecting point (455 kHz out) from FT7800 receiver IC.
Pictures 3,4 and 5 shows module construction details.
Picture 6 shows a QHF antenna, the details can be found on many sites.
Picture 7and 8 shows the amount of signal available using QHF antenna.
Picture 9 show a noaa19 satellite image taken with "new" FT7800 and WXTOIMG software.
The module is powered from pin 5 of the audio amplifier.
Audio wire is taken out through the gap made for fan wires.
Click here for the images
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| Topic: Yaesu 7800/7900 |
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| Yaesu 7800/7900 [message #200] |
Wed, 12 August 2009 10:03 |
N7HLZ
Messages: 1
Registered: August 2009
Location: Arizona |
Junior Member |
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Can anyone confirm if the Mars/Cap mod is the same for the FT-7900R as has been posted for the FT7800 R.
Thanks, Mike
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| Topic: unblock cellular on IC-2820H |
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| unblock cellular on IC-2820H [message #198] |
Tue, 02 June 2009 20:32 |
micwin31
Messages: 1
Registered: June 2009 |
Junior Member |
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WOULD LIKE INFO ON HOW TO UNBLOCK CELLULAR ON MY IC-2820H.
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| Topic: mic wiring |
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| mic wiring [message #197] |
Thu, 07 May 2009 07:15 |
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Hi im looking for the pin configuraion to wire my yaesu md-1 8 pin mic to my kenwood 4 pin ts-830s radio i need what colors go to which pins thanks jon,,cell is 208-410-7772 or can post here on the site thanks jon..any help would be nice thanks..
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| Topic: IC-7700 Mod - Expand 40M |
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| IC-7700 Mod - Expand 40M [message #195] |
Sun, 29 March 2009 00:38 |
root
Messages: 99
Registered: December 2004 |
Member |
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To Expand the 40m band on the IC-7700, add diodes D52 and D56 to the LOGIC UNIT as shown in the image.
***Do this at your own risk.***
[Updated on: Sun, 29 March 2009 00:40]
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| Topic: Icom IC2200H FM Discriminator Location |
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| Icom IC2200H FM Discriminator Location [message #188] |
Wed, 19 November 2008 23:12 |
fungkh
Messages: 2
Registered: September 2008
Location: Keningau |
Junior Member |
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Anyone could help me where is the location of FM discriminator for link it to repeater COR. I need to get a SQL signal to the repeater COR, pls help me, if posibble with photo, thanks....
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| Topic: IC-7200 Band Voltage Modification |
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| IC-7200 Band Voltage Modification [message #179] |
Fri, 29 August 2008 21:40 |
root
Messages: 99
Registered: December 2004 |
Member |
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IC-7200 Band Voltage Modification
If you want to connect an external unit which can be controlled by the band voltatge from [ACC] connector, the modifihoneyion is necessary as in pdf attached.
The band voltage appears from pin 5 of [ACC] connector after modifihoneyion (1) is completed, or the regulated 8 V appears from pin 1 of [ACC] connector after modifihoneyion (2) is completed.
Performing this mod is the customer's responsibility. Icom does not guarantee this modifihoneyion's result.
[Updated on: Fri, 29 August 2008 21:46]
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| Topic: How to expand tx/rx for TM-251A |
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 How to expand tx/rx for TM-251A [message #176] |
Fri, 11 July 2008 21:02 |
inquirer
Messages: 1
Registered: July 2008 |
Junior Member |
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I got an information from here.
http://www.kb2ljj.com/data/kenwood/TM-251_A_E.htm
I've removed D417 and also cut all 3 wire(w1-3) on the PCB but still not success.
The radio don't work if cut all 3 wire(w1-3).so,need to connect them back.
How i do next ?
I do not know D416 already remove ?
Is it need to reinstall if already removed. ?
Attachment: TM-251.JPG
(Size: 79.68KB, Downloaded 525 time(s))
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| Topic: ICOM V-8000 |
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| ICOM V-8000 [message #175] |
Sun, 22 June 2008 22:50 |
shredddincali
Messages: 1
Registered: June 2008
Location: Up North, USA |
Junior Member |
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Okay, so I already saw the mod for the V8000 to expand the TX from 136-174, however, I heard there is a mod to expand the RX to recieve aircraft frequencies, is this true, if so does anybody know how to do it? ICOM V-8000 (US ver).
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| Topic: Icom SM-20 desktop microphone wiring |
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| Icom SM-20 desktop microphone wiring [message #174] |
Fri, 16 May 2008 22:02 |
root
Messages: 99
Registered: December 2004 |
Member |
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Icom SM-20 desktop microphone wiring
1. microphone output (white)
2. +8 VDC input (red)
3. frequency up/down (blue)
4. no connection
5. PTT (yellow)
6. GND (PTT ground) (black)
7. GND (mic ground) (shield)
8. No connection
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| Topic: Yaesu Mic to Kenwood Radio Conversion |
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| Yaesu Mic to Kenwood Radio Conversion [message #164] |
Sun, 03 February 2008 13:20 |
root
Messages: 99
Registered: December 2004 |
Member |
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Yaesu Mic to Kenwood Radio Conversion
To those who may desire to use a microphone with a different transceiver (other than the original microphone brand)
For a Yaesu Mic to work with an Kenwood Radio wire the mic plug as discribed below:
Pin #1 move to Pin #8
#2 move to Pin #6
#3 stays on Pin #3
#4 move to Pin #1
#5 un-solder and tape
#6 un-solder and tape
#7 stays on Pin #7
#8 move to Pin #2 & #5
For Yaesu Mic to work with a Kenwood Radio just reverse the procedure described above.
Note: ALWAYS READ THE SERVICE MANUAL ON BOTH RADIOS BEFORE TRYING THIS MODIFICATION
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| Topic: Kenwood Mic to Yaesu Radio Conversion |
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| Kenwood Mic to Yaesu Radio Conversion [message #163] |
Sun, 03 February 2008 13:16 |
root
Messages: 99
Registered: December 2004 |
Member |
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Kenwood Mic to Yaesu Radio Conversion
To those who may desire to use a microphone with a different transceiver (other than the original microphone brand)
For a Kenwood Mic to work with an Yaesu Radio wire the mic plug as discribed below:
Pin #1 move to Pin #8
#2 move to Pin #6
#3 stays on Pin #3
#4 move to Pin #1
#5 un-solder and tape
#6 un-solder and tape
#7 stays on Pin #7
#8 move to Pin #2 & #5
Note: ALWAYS READ THE SERVICE MANUAL ON BOTH RADIOS BEFORE TRYING THIS MODIFICATION
[Updated on: Sun, 03 February 2008 13:21]
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| Topic: Kenwood Mic to Icom Radio Conversion |
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| Kenwood Mic to Icom Radio Conversion [message #162] |
Sun, 03 February 2008 13:14 |
root
Messages: 99
Registered: December 2004 |
Member |
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Kenwood Mic to Icom Radio Conversion
To those who may desire to use a microphone with a different transceiver (other than the original microphone brand)
For a Kenwood Mic to work with an Icom Radio wire the mic plug as discribed below:
Pin #1 stays on Pin #1
#2 move to Pin #5
#3 stays on Pin #3
#4 stays on Pin #4
#5 move to Pin #2
#6 move to Pin #8
#7 stays on Pin #7
#8 move to Pin #6
For Icom Mic to Kenwood Radio you must preform a special Mod on the mic
Note: ALWAYS READ THE SERVICE MANUAL ON BOTH RADIOS BEFORE TRYING THIS MODIFICATION
[Updated on: Sun, 03 February 2008 13:21]
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| Topic: Uniden BD996 Discriminator tap |
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| Uniden BD996 Discriminator tap [message #161] |
Sun, 03 February 2008 13:03 |
root
Messages: 99
Registered: December 2004 |
Member |
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Uniden BD996 Discriminator tap
OK, I dug around a little and it appears our friends at Uniden made it real easy!
Take off the outer case shell, and then the top inner case. Just about dead center on the board look for the solder pad labeled "DISC". Run a single insulated wire to this point to a jack of your choice (I prefer RCA jacks) mounted on the rear of the radio. I also like to use a tantalum capacitor in line with the jack as well.
If you take the bottom inner cover off the radio you will see the best place to install the jack appears to be the area of the bar code/serial number label. This is kind of thick double walled metal so be careful drilling. You could also just run an audio cable into the radio through the threaded rear hole or even one of the holes on either side of the radio's rear.
Ray Colvill
[Updated on: Sun, 03 February 2008 13:05]
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| Topic: Expand Frequency Coverage on TX/RX for the Icom IC-W32A/E |
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| Expand Frequency Coverage on TX/RX for the Icom IC-W32A/E [message #158] |
Sun, 20 January 2008 14:24 |
root
Messages: 99
Registered: December 2004 |
Member |
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Icom IC-W32A Mod
Expand Frequency Coverage on TX/RX for the Icom IC-W32A/E
NOTICE: We can not guarantee specifications beyond the amateur bands. Not responsible for any damages incurred in
attempting this procedure. This modification may void all warranties.
1. Remove the battery.
2. Remove the 4 screws holding the rear cover and the 2 lower screws holding the shield in place in the battery compartment.
3. Carefully lift the rear cover with the battery comparment shield away from the front cover.
4. The front and rear sections are connected together with a flex strip connector. Carefully lay the rear section aside by lifting
upward, turning and laying the rear section over away from the front cover leaving the flex strip connected.
5. With the front cover section in front of you, antenna connector to your left, locate the notch at the right side of the exposed PC board. Next locate the three, 3 terminal diodes near the lower corner of the notch. Two are in line from left to right, with the third below the diode to the right. This last diode (the one below the right one) is diode D523. Very carefully remove D523.
6. Reassemble the radio in reverse order.
7. Perform a system reset by holding down the Squelch button (on the side) and the Band button while turning the radio on.
Note that all memories will be erased, so write down anything you want to save and reprogram.
VHF coverage will be from 140 to 170 (plus or minus a bit) on Tx/RX
UHF coverage will be from 430 to 470 (plus or minus a bit) on TX/RX
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| Topic: IC-290 Mod - Enhance SSB audio quality |
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| IC-290 Mod - Enhance SSB audio quality [message #157] |
Sat, 19 January 2008 20:00 |
root
Messages: 99
Registered: December 2004 |
Member |
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IC-290 Mod - Enhance SSB audio quality
French language below
On strong signals (59+) the SSB demodulated audio is affected by distortion. On weak signals, the noise coming from the SSB demodulator can be improved for a better S/N ratio.
To modify your IC290, you need the schematic diagram and layout plan of the device.
Remove the bottom cover (speaker side) to gain access to the main PCB.
Remove all connectors carefully (use a screw driver as lever). This PCB is sensitive to ESD.
Close to IC3, change capacitor C55 from 1 nF to 10nF to move the low pass cut-off to 5kHz. Use a good ceramic capacitor (X7R 1206 SMD, or a small MKT like Wima).
Change capacitor C53 from 0.047-??F to 22nF to limit audio low frequency to 200 Hz.
Replace the capacitor C87 1-??F by 0.47-??F tantalum or MKT. This capacitor acts only in transmitting low frequency if your voice is too deep. But, take care of the quality of this capacitor. Don't use a bad quality ceramic capacitor.
Modify the region of Q29 close to IC11. The audio is fed to Q29 as audio amplifier.
In parallel to R187 (collector load), add a 10nF X7R SMD capacitor. This will add a final low pass cut-off frequency at 4.5kHz to remove all high frequency noise from audio.
Cut the emitter track of Q29 to add a 150 Ohms resistor in series with the (C157 R188) couple. This will add an emitter feedback to reduce distortion in SSB and FM. Note : collector voltage of Q29 is near 5 V.
Change capacitor C157 from 4.7-??F to 22-??F 6V minimum, a tantalum capacitor will be better. This will improve low frequency and audio will be smooth and less aggressive (not like Asian sound!).
You could improve power supply rejection by changing C155 from 10-??F to 47-??F/10V.
I did those modifications to improve the quality of my transceiver used in short-wave band with a transverter. The sound quality is less aggressive.
Testing your transceiver:
To compare improvements, I checked the full frequency response of the receiver:
Connect a noise source to the receiver antenna socket, or your antenna pointed to sun (to get a wide band noise).
Connect the sound card of your PC to R153 via 10-??F capacitor.
Load up a DSP software SPECTRAN that makes FFT on audio signal, average the display with a factor close to 16. You will see the audio response of your transceiver. (SPECTRAN: http://www.qsl.net/padan/spectran.html)
Transceiver frequency response before modification:
too much emphasis on high frequencies and low frequency attenuation.
Transceiver frequency response after modification:
better frequency balance and broader bandpass.
Have good QSOs !
73's from F5RCT
Augmentez la qualit+?? audio en SSB de votre IC-290
En forts signaux (59+), la d+??modulation en SSB est affect+??e par de la distorsion. En signaux faibles, le bruit provenant du d+??modulateur peut +??tre am+??lior+?? pour augmenter le rapport signal sur bruit.
Pour modifier votre IC-290 vous avez besoin du sch+??ma et du plan d'implantation de l'appareil.
D+??poser le couvercle du fond (cot+?? haut-parleur) pour acc+??der au circuit imprim+?? principal (MAIN PCB).
D+??brancher d+??licatement les connecteurs (sans tirer sur les fils), en se servant d'un tournevis pour faire levier. Le circuit est sensible aux d+??charges +??lectrostatiques.
Pr+??s de iC3, remplacer le condensateur C55 de 1nF +?? 10nF pour d+??placer la fr+??quence de coupure +?? 5 kHz. Utiliser un bon condensateur c+??ramique (type X7R 1206 CMS, ou un petit MKT type "Wima").
Remplacer le condensateur C53 de 0.047-??F +?? 22nF pour limiter le fr+??quences basses +?? 200 Hz.
Remplacer le condensateur C87 de 1-??F +?? 0.47-??F tantale, MKT ou +??lectrolytique aluminium. Ce condensateur agit en +??mission sur la clart+?? de la voix et les fr+??quences basse du domaine audio (int+??ressant pour les OM qui ont une voix tr+??s grave). Mais attention +?? la qualit+?? de ce condensateur car l'imp+??dance s+??rie doit rester faible, ne pas mettre de capacit+?? c+??ramique miniature.
Modifier la r+??gion de Q29 pr+??s de iC11. Le signal audio passe par Q29 en tant qu'amplificateur audio.
En parall+??le +?? R187 (charge collecteur), ajouter condensateur 10nF type X7R 1206 CMS, ou un petit MKT type "Wima". Ceci ajoute un filtre passe bas +?? 4.5 kHz pour att+??nuer toutes des hautes fr+??quences du spectre audio, y compris en mode FM.
Couper la piste tout pr+??s de l'+??metteur de Q29 pour ajouter une r+??sistance de 150 Ohms en s+??rie avec le couple (C157//R188). Cette r+??sistance ajoutera une contre r+??action d'+??metteur pour r+??duire la distorsion en SSB et en FM. Note : la tension du collecteur de Q29 est proche de 5V.
Remplacer le condensateur C157 de 4.7-??F +?? 22-??F (6V min), un tantale c'est parfait ! Cela am+??liore les basses fr+??quences et l'audio est plus doux (et moins agressif comme le son asiatique !).
On peut augmenter la r+??jection d'alimentation en rempla+??ant C155 de 10-??F +?? 47-??F/10V.
J'avais fait ces modifications pour augmenter la qualit+?? de mon transceiver que j'utilise en ondes -courtes avec un transverter. La qualit+?? est beaucoup moins agressive.
Testez votre transceiver:
Pour comparer les am+??lioration, j'ai v+??rifi+?? la r+??ponse compl+??te en fr+??quence du r+??cepteur:
Connecter une source de bruit +?? l'entr+??e du r+??cepteur, ou votre antenne (avec pr+??ampli) point+??e vers le soleil pour avoir une source de bruit large bande.
Connecter la carte son de votre PC sur la sortie haut-parleur (jack-externe)
Charger un logiciel de traitement num+??rique pour faire une FFT du signal audio. J'ai utilis+?? Spectran avec un facteur average de 16. http://www.qsl.net/padan/spectran.html
R+??ponse en fr+??quence de mon IC290 avant modification:
accentuation des aigu+??s et att+??nuation des graves.
R+??ponse en fr+??quence de mon IC290 apr+??s modification:
meilleur +??quilibre des fr+??quences et bande passante +??largie.
Bons QSOs !
73's de F5RCT
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| Topic: Ham 900 Band Filters on ebay |
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| Ham 900 Band Filters on ebay [message #154] |
Mon, 31 December 2007 10:31 |
DBMdbm
Messages: 1
Registered: December 2007 |
Junior Member |
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FYI Maxtrac 900 ham band filters for sale on ebay
Item number: 180201771850
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| Topic: YAESU FT767GX from 1.5Mhz to 29.99999MHz Mod |
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| YAESU FT767GX from 1.5Mhz to 29.99999MHz Mod [message #152] |
Wed, 19 December 2007 20:40 |
root
Messages: 99
Registered: December 2004 |
Member |
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YAESU FT767GX from 1.5Mhz to 29.99999MHz Mod
I have recently purchased the aforementioned transceiver. I have had no problems to speak of and enjoy the rig thoroughly. I would like to submit the following mod for the rig. Note that implementation on this mod is at the rig owner's risk and may violate warranties. Here is a description of the mod:
o Remove the bottom cover (8 screws: 4 underneath, 2 on each side)
o Remove the plastic rear panel. (Just a cosmetic piece)
o Remove the rear metal panel. (So many screws)
o Loosen the "hinge" screws on the front bottom. There are 4 of them.
o Lift the now loose card tray to expose to inner circuit boards. Be careful! There are two power supply lines that need to be disconnected.(Remember to reconnect them on assembly.) (one is the control board, the other the one we want.) Note that the board we will mod is the same one that has the switch that allows changing the tuning dial from 5kHz/rev to 10kHz/rev.
o Change the position of switch S01. The rig will now transmit from 1.5 to 29.99999 MHz.
o Reverse the disassembly procedure.
Well that's it. You are now ready for any band addition that may come our way. If you have problems, reply; I'll try to answer your questions.
73s de KA1TIH : Kendell_Chilton@dgc.mceo.dg.com (Ken Chilton)
[Updated on: Wed, 19 December 2007 20:40]
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| Topic: TM-941A Mod - Open Transmit Mod |
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| TM-941A Mod - Open Transmit Mod [message #150] |
Sun, 02 December 2007 14:00 |
root
Messages: 99
Registered: December 2004 |
Member |
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TM-941A Open Transmit Mod
The following mod will allow the TM-941A to transmit from 142.000 to 151.995 mhz, 420 to 450 mhz and 1100 to 1400 mhz.
1. Disconnect power supply and antenna
2. Remove the detachable front panel assembly
3. Locate a green jumper wire on the control board, in the body of the transceiver. The wire is located towards the left edge of the board
4. Cut the green wire loop in half and insulate
5. Install front panel assembly, and connect power and antenna
This mod works, but is done at your own risk
Author: ZS5
J
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| Topic: Preamp mod for Yaesu FT-890AT |
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| Preamp mod for Yaesu FT-890AT [message #149] |
Mon, 26 November 2007 21:57 |
root
Messages: 99
Registered: December 2004 |
Member |
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Try this Preamp mod for the Yaesu FT-890AT...
Yesterday we made a similar modification, as I mentioned with my FT-990.
My friend (HA5AUC) have an FT-890. We changed the parallel-connected gg 2SK125's in the preamplifier stage to J310's. (Q2008 and Q2006) (Be care with the different pin-out!).
Results: bit less noises, bit more gain.
HA5BWW
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| Topic: BC95XLT BC-92XLT BC-72XLT Pro-83 Pro-84 Frequency Counter |
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| BC95XLT BC-92XLT BC-72XLT Pro-83 Pro-84 Frequency Counter [message #146] |
Sat, 17 November 2007 13:47 |
root
Messages: 99
Registered: December 2004 |
Member |
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The Uniden BC-95XLT Can Be Used As A Frequency Counter.
To enter this mode Press "HOLD,3 and 0" while turning the Power On.
You then can change the group of frequencies you wish to check.
To do this use the Up and Down Arrow Keys.
The Scanner will display the strongest frequency transmitted.
Example: To check a Citizens Band Radio frequency, select The Lo group.
If you Transmit on Channel 20 the scanner will display 27.205 MHz.
You can check with a Ham Radio, Marine, GMRS, etc.
It will display the frequency used.
This Will also work on Uniden BC-92XLT & BC-72XLT.
Should work with Radio Shack PRO-83 & PRO-84.
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| Topic: ic 7000 Mars Mod (UK Model) Needed |
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| ic 7000 Mars Mod (UK Model) Needed [message #142] |
Tue, 25 September 2007 07:32 |
2e0mcg
Messages: 1
Registered: September 2007
Location: cheshire uk |
Junior Member |
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hi im after the mars/cap mod for the icom ic 7000 (uk model) all i can find is us mod,no definative instructions stating the uk mod,any help would be appreciated,regards john. allojohny@yahoo.co.uk
[Updated on: Sat, 26 December 2009 09:40] by Moderator
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| Topic: Alternate fan mod for IC-7000 |
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| Alternate fan mod for IC-7000 [message #141] |
Tue, 28 August 2007 02:09 |
root
Messages: 99
Registered: December 2004 |
Member |
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!! IF YOU ARE UNSURE ABOUT PERFORMING THIS MOD DON'T!!
!!IF YOU DAMAGE YOUR RADIO YOU ONLY HAVE YOURSELF TO BLAME!!
I have performed this mod on MY OWN radio without any adverse affects and my LDG AT-7000 atu still works as it should.
Before this mod after been turned on for an hour or so the temp meter on the radio would show around 50% on the scale (7 or 8 bars), after the mod the temp meter shows around 25% on the scale (4 bars).
First remove the top cover and remove the fan from the radio,
take a 100ohm resistor and solder a length of wire to each end and cover with heat shrink tubing. Cut the red wire to the fan and attach one of the resistor wires between the two halves and cover with heat shrink tubing.
Next follow the ORANGE wire from the ATU molex socket on the back of the radio to where it is soldered on to the DDS unit (top right hand corner at the back of the radio) and attach the remaining resistor wire to this point, position the resistor and wires so that they look neat and tidy and then refit the fan and the top cover, mod is now complete.
M3SVO
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| Topic: Monitor AM on the Yaesu FT-8800 |
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| Monitor AM on the Yaesu FT-8800 [message #140] |
Sat, 18 August 2007 23:45 |
root
Messages: 99
Registered: December 2004 |
Member |
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Monitor AM on the Yaesu FT-8800
How to monitor AM outside the default Aircraft band:
Depress the set button once and rotate the left selector knob to menu item 46, it will say AM.
Select the frequency you wish to operate by VFO. You are now on AM. If you turn VFO one click to left or right, radio will revert back to FM.
You can program this into a memory channel and it will stay in the AM mode.
Author: KC9BZX
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| Topic: Yaesu FT7200 Mod - Call Tone 1750 Hz volume increase |
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| Yaesu FT7200 Mod - Call Tone 1750 Hz volume increase [message #139] |
Sun, 05 August 2007 00:14 |
root
Messages: 99
Registered: December 2004 |
Member |
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I'm a long time user of the Yaesu FT-7200.
This transceiver came with a very low level 1750 Hz repeater tone.
Nearly no repeater could be opened easily, at least you hda to press the call button a very long time.
If you compare the volume/deviation of different transceivers you will 'hear' what I'm talking about.
I know that nowadays the repeaters should use a lower deviation, but this can be adjusted with a summing resistor R1058 on the main unit. See the picture attached.
Please be aware that this modifihoneyion also influences the level of the CTCSS sub-tones.Check the circuit diagram for details.
The recommendation to REPLACE R1058 I did not like, It might damage the PCB as the components are glued to the board.
It's much easier to switch 68 kOhms in parallel, changing the value allows an adjustment of the deviation. (68k//68k=34k)
Comparing the volume (and spectrum on a spectrum analyzer) I found out that 68 kOhms work fine.
Use a very small wired resistor or a SMD version and be sure that not short circuit occur.
Please proceed at your own risk.
Good luck!
Wolfgang DH3WO
[Updated on: Sun, 05 August 2007 00:15]
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| Topic: Add 30-meter Transmit to Kenwood TS-180S Transceiver Mod |
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| Add 30-meter Transmit to Kenwood TS-180S Transceiver Mod [message #138] |
Sat, 21 July 2007 00:40 |
root
Messages: 99
Registered: December 2004 |
Member |
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The WARC band kit for the TS-180S is a pretty rare item these days, but I figured it should be easy to add 30m CW transmit capability to the non-WARC stock rig, as it already receives the 10 MHz band using the normal receiver stages.
The 10 MHz band is marked JJY/WWV on the band switch. The schematics revealed that the 30-meter part of the WARC band option adds an additional low-pass filter to the LPF board, and a band pass "AUX 3" filter to the Coilpack board.
I found you could substitute a 10.7 MHz FM transistor radio IF transformer (I used a Mouser 42IF122 for the bandpass filter. For the low-pass filter I added two wire jumpers on the two rear-most sections of the bandswitch (at the LPF board) so that the 7 MHz and 10 MHz lugs were connected together. This puts the 7 MHz low-pass filter section is also in-line for the 10 MHz band.
The only tune-up necessary was to set the rig to 10.120 MHz or so and peak the new IF transformer.
I achieved about 60 watts output and confirmed the signal was clean by feeding a sample of the output into my spectrum analyzer. The spurious outputs were down below the original specs of the rig, so I called it "good" and made some contacts on 30-meter CW.
Steve Johnston WD8DAS
July 2007
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| Topic: Programming Cable for Icom IC-F12 |
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| Programming Cable for Icom IC-F12 [message #136] |
Sat, 02 June 2007 01:36 |
root
Messages: 99
Registered: December 2004 |
Member |
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Programming Cable for Icom IC-F12
Simple handle programmer for radio transceiver ICOM ICF12, mounted with one plug P2 stereo and a female connector DB25 where bolt 15 of the female DB25 will be for data, bolt 1 land. It will have to be made to jumper between bolts 4 and 11 of the female DB25, this female connector DB25 will go on in any interface on type RIB to a PC. Detail of plug P2 stereo that will go to the radio:
bolt 1 nc
bolt 2 data from bolt 15 female DB25
bolt 3 gnd from bolt 1 female DB25
[Updated on: Sat, 02 June 2007 01:38]
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| Topic: IC-P7A MARS Mods |
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| IC-P7A MARS Mods [message #135] |
Wed, 30 May 2007 21:16 |
root
Messages: 99
Registered: December 2004 |
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IC-P7A MARS Mods
The following mod works exactly as described for the Icom IC-P7A (see mod for the IC-E7)
NOTE: The sticker is a very small (1cm) one and in the P7 the pads are shorted with a SMT diode. With a steady hand, a jewlers loupe, and some really small tweezers, you can pluck the diodes off lohoneyions 3 and 4 (as noted below.)
As per EB4EQA:
TX bands configuration via 4 solder pads in the PCB, behind a square sticker lohoneyed under the battery, on the top-left corner.
I've number the pads as seen while looking to the back of the transceiver, with no battery and the PTT looking to your right.
1234 VHF_TX UHF_TX
OOOO 136-174 400-479
OOOS 136-174 430-440
OOSS 144-146 430-440 (factory)
O = Open
S = Short
Procceed at your own risk.
[Updated on: Wed, 30 May 2007 21:17]
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| Topic: Open Icom IC-M800 or IC-M810 to ham Frequency |
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| Open Icom IC-M800 or IC-M810 to ham Frequency [message #129] |
Mon, 07 May 2007 20:01 |
root
Messages: 99
Registered: December 2004 |
Member |
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Open Icom IC-M800 or IC-M810 to ham Frequency
This modification allow the IC-M800 or IC-M810 marine band transceiver to be used in ham bands.
To make this mod you must remove power, disconnect the antenna and remove protective top and bottom cover to gain access to the RF UNIT which is on the lift side of the radio.
This mod require your cut D25 and D26 on this board. Also you must cut wire W1 on the logic unit board.
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| Topic: ICOM IC-2820 Extended band, cross-band procedure |
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| ICOM IC-2820 Extended band, cross-band procedure [message #128] |
Sun, 06 May 2007 13:07 |
root
Messages: 99
Registered: December 2004 |
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I have tested on my IC2820 the diodes guide for extended bands. Please, open the down side and look at the two rows of diodes on the right side, placed vertically (foto 1).
From up to down (foto 2):
First diode is not present
Remove second diode: 144-150 Mhz 430-450 Mhz auto-repeater USA
+ Remove fourth diode: 144-148 Mhz 430-450 Mhz
+ Remove fifth diode: 144-148 Mhz 400-470 Mhz
+ Remove sixth diode: 137-174 Mhz 400-470 Mhz
+ Seventh diode apparently it doesn't change anything ……
Applying the eighth: cross-band is activated
To activate cross-band procedure, press and hold two main band knobs and press ; the radio will beep and the key symbol on the left side of the display will flash; now the radio is now active in the cross-band mode.
To cancel the cross-band repeat function, please press .
Good test, Luca IK0YYY, Rome, Italy.
[Updated on: Sun, 06 May 2007 13:11]
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| Topic: IC-7000 Alternate method to enable TV mode |
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| IC-7000 Alternate method to enable TV mode [message #106] |
Tue, 30 January 2007 23:58 |
root
Messages: 99
Registered: December 2004 |
Member |
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The IC-7000 has an additional set of solder pads next to TV diode D2154.
The solder pads are in the shape of half circles connected by a thin printed trace. The thin pc trace can be easily cut with an exacto type knife.
If present this method eliminates unsoldering the small surface mount diode, furthermore, the TV function can be easily disabled by bridging the half circles with solder.
[Updated on: Tue, 30 January 2007 23:58]
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| Topic: Icom IC-7000 TVRO & MARS Mods by Steve, N5AC (US version) |
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| Icom IC-7000 TVRO & MARS Mods by Steve, N5AC (US version) [message #93] |
Mon, 25 December 2006 03:23 |
root
Messages: 99
Registered: December 2004 |
Member |
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Thanks to Steve, N5AC for his research and success in determining the mods below!
Disclaimer: No liability is assumed for the accuracy of this material or the consequences of its use. Use of this information is intended to be eduhoneyional and is at your own risk. Modifihoneyions to your radio may void its warrantee and may be illegal in your country. It is your responsibility to check and follow the laws of your country in regards to this information. In NO case should the TV function of this unit be watched by the driver while a vehicle is in motion. The pictures below are from the USA #5 version of the IC-7000. See additional notes after the modifihoneyion information.
TVRO:
1. Remove CPU/DSP unit by unscrewing three silver screws holding it down (the silver box on the top of the radio with copper taped sides) and pull up.
2. Lohoneye four shift registers and bank of diodes - shift registers are 4094's. There are two next to each other and then a couple more. We'll call the two stacked the "left" ones
3. The "middle" shift register if looking from the front of the radio is the target.
4. Lohoneye bank of SMT diodes (silver with "K" on top on one side) in front of the target shift register. They are in two columns, "left" and "right"
5. Unsolder one side of the second diode from the front on the right and lift up one side (or remove, slip to the side, whatever turns you on)
MARS:
OK - here's an out-of-band mod that does TX from 0-54, 118-173, 400-470.
1. Remove CPU/DSP unit by unscrewing three silver screws holding it down (the silver box on the top of the radio with copper taped sides) and pull up.
2. Lohoneye four shift registers and bank of diodes - shift registers are 4094's. There are two next to each other and then a couple more. We'll call the two stacked the "left" ones.
3. The "left" shift register if looking from the front of the radio is the target.
4. Lohoneye bank of SMT diodes (silver with "K" on top on one side) in front of the target shift register. They are in two columns, "left" and "right".
5. Unsolder one side of the second diode from the front on the left and lift up one side (or remove, slip to the side, whatever turns you on).
NOTE: The Automatic Repeater Shift on 2 meters and 440 is not affected by this mod! The “Band Edge Beep”, on the other hand, does not function.
NOTES:
* The modifihoneyion information for MARS is the official modifihoneyion information from ICOM USA, so the modifihoneyion may not be appropriate for versions other than the USA #5 unit.
* IC-7000 owners performing the mod do so at their own risk.
* The diodes should be unsoldered carefully, not broken or crushed.
* If decision is made to reverse the modifihoneyions, remember these are diodes, and must be replaced in the proper direction
* No responsibility is assumed for the accuracy of the mod info, or for the consequences of its use.
* Transmitting on unauthorized frequencies is in breach of radio regulations.
USING THE TVRO FUNCTION:
After modifihoneyion, TV channels 2-13 are available (USA) in NTSC format
* Push and hold [AF(set)] for one second to turn TV mode ON and OFF
* Rotate [M-ch] (inner control) to select the desired TV Channel
* The Band keys to the far right of the radio also change TV channels
* There will be a popup showing the TV channel (This can be turned off in set mode)
* The preamp and attenuator functions are functional in TV mode and each channel can store the preamp/attenuator on/off functions independently
* There will be a popup showing the ATT/P.AMP status (This can be turned off in set mode)
* Rotate [AF] for a suitable volume level.
[Updated on: Sat, 26 December 2009 09:48]
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| Topic: ICOM R-7000 Receiver Heat Sink Cooler |
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| ICOM R-7000 Receiver Heat Sink Cooler [message #74] |
Sat, 09 September 2006 20:32 |
root
Messages: 99
Registered: December 2004 |
Member |
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The new ICOM R7000 25-2000 MHz receiver is a super radio, but the power supply tends to run hot. The two biggest heat generators are the pbasstransistor and bridge rectifier module. The stock heat sink, a flat piece of metal bolted to the inside of the cabinet rear, is inadequate. After 30 minutes of use, the back panel gets very hot, and the entire cabinet warms.
I added a small heat sink to the outside of my radio, using the screw that holds the bridge rectifer to the stock heat sink. An application of heat conductive grease between the added sink and the cabinet helps the heat transfer process. Now the rest of the cabinet gets barely warm to the touch.
Bob Parnass, AJ9S
[Updated on: Sat, 09 September 2006 20:37]
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| Topic: Icom 02AT Frequency Modification |
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| Icom 02AT Frequency Modification [message #64] |
Sun, 25 June 2006 16:41 |
root
Messages: 99
Registered: December 2004 |
Member |
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icom 02at mod 140-163 mhz
a. locate a copy of the june 1986 issue of 73 mag.
b. the article on pg. 60 is for models with id numbers
lower than 35,000. if yours is one of the newer
models like mine..... then follow these changes:
1. read the entire article b-4 doing anything!!!
2. follow steps 1 to 3 on pg. 61 "modify ur 02at"
then s t o p ! refer to fig.2 on pg. 60 and remember
the diodes on urs are in different locations than in
the pix.
3. using a very small flat blade iron and some solder wick
remove the the three leg diode d2 notice that the
numbering for d1,d2,d3,d4 are off to the left of the
actual location of the diodes on the board.
4. resolder d2 down in position d5 try to use the solder
on the pads.. only add solder to the pads if absolutely
necessary, b-4 you put the diode in place to avoid
bridging.
5. solder a store bought 1n914 or 1n4148 diode from the top
pad to the bottom left pad of d4. you will need to bend
and cut the leads of the diode and pre-tin with solder.
bend the leads of the diode so that the body of the
diode across the bottom right pad covering it up.
the banded end ohe the diode should be facing down
towards mhe bottom right pad.
now you are ready to follow steps 7 to 13 and the rest of the
instructions in the article. the only difference you will find
is that a letter "u" will flash to indicate unlocked instead
of the entire display flashing.
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| Topic: Audio Modification for Icom IC02 and IC04 Radios |
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| Audio Modification for Icom IC02 and IC04 Radios [message #63] |
Sun, 25 June 2006 16:38 |
root
Messages: 99
Registered: December 2004 |
Member |
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This audio mod works on the 02 and 04AT. It increases the level of audio, as well as rolling off some of the lows. Sounds real nice. It involves the circuit around Q105.
1. Replace C119 with a .01 uF cap (disc ceramic is fine).
2. Parallel R131 with a 1 uF cap (use a tantalum cap).
3. Parallel R132 with a .01 uF cap (disc ceramic is fine).
This is not the same mod as the one International Radio is advertising, which involves changing C117.
I tried an AB-1 Audiolaster from Engineering Consulting, and was very unhappy with the results. I am very pleased with the audio given by this mod (much cheaper too!).
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| Topic: Icom IC02 PL Out of Band Modification |
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| Icom IC02 PL Out of Band Modification [message #62] |
Sun, 25 June 2006 16:36 |
root
Messages: 99
Registered: December 2004 |
Member |
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The following method of modifying the Icom IC02. This one should give you PL out of band without jumpering 5 VDC to the tone chip. Use 1N914 or equivelent when adding diodes.
1. On the logic matrix, remove D402 and D403.
2. Add D402, D403 and D404 with the cathode at 4 o'clock and the anode at 12 o'clock.
3. Retune the VCO to cover your desired frequency spread. My 02AT did not want to go beyond 163 MHz. I have a friend whowas able to get his to the low 170s.
4. To jump from 140 to 150 or from 150 to 160 (or vice versa) you must "tune across" the boundry, in the same way that you do for an unmodified 02AT. For example, key in 149.995 and then move up until you are in the 150s. You can then enter any 150 MHz frequency (starting with the MHz).
-----------------------------
***->Be careful not to transmit out-of-band, or accidentally operate on any non-amateur, unless you are authorized to do so.
DO NOT JEOPARDIZE YOUR LICENSE!
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| Topic: ICOM I290 Modification |
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| ICOM I290 Modification [message #61] |
Sun, 25 June 2006 16:33 |
root
Messages: 99
Registered: December 2004 |
Member |
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OBJECTIVE:
---------
The objective of the modification is to implement a delay before scanning restarts when, in SCAN-STOP mode on BUSY frequency, the received signal disappears.
The modification will then allow a frequency to be free for a while before scanning resumes. With this modification, it will be given a chance to a signal to come back within a few seconds before the scanning restarts. Now multiple QSOs or poor signals won't be truncated any more because of a too much impatient scanning !
WHAT TO DO:
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Very simple. On the SENSOR UNIT, just solder a jumper between:
- the unused contact of switch S3 (the one corresponding to the TIMER OFF position of the circuit commanding the SEL pin of IC1)
- and the EMPTY signal of connector J3 (this is the extreme pin nearest S2 on the SENSOR unit)
ATTENTION, there are some errors on the electrical scheme that I possess reference A-0488 :
* The S3 switch is represented in position TIMER OFF and not ON as written. You have to reverse labels OFF and ON.
* The signals BUSY and EMPTY on connected are reversed. EMPTY (SQ1) is on the extreme left pin of S3 and BUSY is on 2nd pin of this connector S3. In fact, the switch S2 is drawn in the BUSY position and not EMPTY.
HOW IT WORKS :
-------------
The TIMER starts when pin SEL of IC1 goes to 0V. When the TIMER is running, the scanning is halted. The scanning also stops when the BUSY signal is low level (0V) on pin SQL of IC1. Let us suppose that a signal is received. Then BUSY goes to 0V and scanning halts. At the same time the EMPTY signal , which is the inverse of BUSY, goes to 5V and the TIMER remains off.
If the received signal disappears BUSY goes high and EMPTY low, then the TIMER is enabled and starts running. It also maintains the scanning in halt mode.
If, at the end of the TIMER delay, no signal has come back then the scanning restarts. If a signal comes back before the end of the TIMER delay then the BUSY signal returns to 0V and maintains the scanning in halt mode. In the meantime the TIMER will run until the end of its delay without any action on the process.
The TIMER delay is chosen with the R32 potentiometer on the SENSOR UNIT. The minimum value is about 4 to 5 seconds which is perfect for this working mode.
CONCLUSION:
----------
Small modification .... great effect !
============================================================ ==============
Note: Proceed at your own risk.
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| Topic: Expanding Functions for the IC-V8000 |
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| Expanding Functions for the IC-V8000 [message #58] |
Mon, 08 May 2006 23:54 |
root
Messages: 99
Registered: December 2004 |
Member |
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This PDF contains content on the ICOM V-8000:
1. RX Frequency Expansion
2. TX Frequency Expansion
3. ANI Function
4. Voice Scrambler Function
5. MIC Gain Level
6. Wide and Narrow Function
Click here for the PDF document for these function mods
[Updated on: Mon, 08 May 2006 23:55]
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| Topic: Icom IC-2720H Out of Band Mod |
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| Icom IC-2720H Out of Band Mod [message #57] |
Fri, 28 April 2006 23:23 |
root
Messages: 99
Registered: December 2004 |
Member |
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