Subject: Yeasu FT-840 general TX mod
From: "Donald J. Bensch Sr." | Yaesu FT-840 Expanded RF
>| All band modification:
1. Remove ant from radio.
2. Remove top and bottom covers.
3. On Local Unit , TEMPORARY jump TP-2003 to ground.
(Take a wire lead + attach to the metal case)
4. Press & Hold (SSB) + (AM) and turn power on.
(Display will show 02-OFF)
5. Rotate main control to show 02-ON
6. Press AM. The display should read (7.000.00 LSB)
7. Turn radio off.
8. Press and hold the memory (DOWN) + (UP) buttons and turn radio ON.
9. Turn the radio OFF.
10. Remove the jumper to ground on TP-2003.
11. Reassemble radio.
Think u were missing step #6. Mod taken from Book 8A
Gud luck.....hope this helps....dave
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David M Schertzer NOPF Whidbey Is.WA USA Canadian NAVY
Email :subbustr
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From: G7MRI
To :YAESU
Well guys i see that many people have been looking for mods for
this radio so here is the out of band tx mod.
1. take off bottom and top covers.
2. connect a jumper from point TP2003 to ground. this is temporary
while preforming the programming steps. that point is in front and to
the edge of the lithium battery.
3. with the ft-840 off, press and hold the (SSB) & (AM) buttons at the
same time. turn on the rig, then release the buttons simultaneously.
4. the display will show (02-ON). press the (AM) button to confirm
setting:it should read 7.000.00 LSB. turn rig off.
( If the rig does not show 02-on move the main freq knob to change it)
5. press and hold in the MEM , (DOWN) and (UP) buttons while turning
rig "on".
6. turn pwr off, and remove jumper.
7. if you have a problem, dump the backup memory by switching the back
up switch off per the manual.you can then redo the steps.
If you know of any mods please let me know and if you can find out what
01-ON/OFF to 09-ON/OFF i think it goes to, what do the other settings do.
73's de John
G7MRI
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The mod below was the only mod for the FT-840 that I could find on the net.
THE MOD BELOW DOES NOT WORK!!! It is listed here for reference only.
Archievers might want to remove this mod if they have it.
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From: paul
Subject: FT-840 Expanded RF Mod
Date: 10 Dec 94 08:02:20 EST
I saw many requests for this mod but never had a chance to post it till now.
Yaesu FT-840 Expanded RF
All band modification:
1. Remove bottom cover and locate vertical pin TP 2003.
2. Connect a jumper wire from this pin to ground.
3. Hold SSB button and AM button at the same time and turn the radio On.
4. Frequency display should read "02 OFF". Turn Frequency knob until display
reads "02 ON". Now turn radio Off.
5. Hold VFO/M button and UP and DOWN buttons at the same time and turn the
radio On.
6. Last, turn radio Off and remove jumper from Test Point 2003.
7. Reassemble radio.
This mod allows gerneral coverage transmit on the FT-840.
I assume no responsibility, proceed at your own risk.
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73 de KE4QJA Paul
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