Pin 3 =
Pin 4 = RX audio (Only available on some radio's)
Pin 5 =
Pin 6 = PTT (Push To Talk)
Pin 7 = Ground
Pin 8 = MIC input
The information above is given in good faith and I DO NOT, under any circumstances accept any liability.
Please make sure that you are familiar with the pin numbers on the mic sokets (fitted to end of mic leads) before you make
Subject: Yaesu 8-pin mic
1. = Channel Up
2. = +B (5V)
3. = Channel Down
4. = LF Out (Speaker)
5. = 1750Hz Tone via 1k resistor to Ground
6. = PTT
7. = Ground
8. = Mic
This modification is read 1491 times.
(FL-2100) FL-2100B 12 meter modification
If you do not mind losing 10 meters on your FL2100B, this quick mod should have you up and running on 12 meters with
near full power output.
Place the FL2100B on its side with the LOADING control nearest the surface that the amp is setting on. Make sure that the
amp has been UNPLUGED and that the PLATE VOLTAGE has dissipated before you proceed. Remove the screws that hold the
bottom cover on and remove the bottom cover of the amp.
Set the BANDSWITCH to : 10
Set the PLATE CONTROL to : 9
Set the LOADING CONTROL to: Fully counter-clockwise
Disconnect the 850 volt red wire that leads from the transformer to the DIODE BOARD (located right behind the TRANS -
OPERATE switch. Install a SWR bridge between the EXCITER and the FL2100B. Tune your HF rig to 24.950. Turn the
FL2100B on and place the amp in the OPERATE MODE. Excite the the AMP with an AM signal, enough so that you can
calibrate (set) your SWR meter. Place your SWR meter in the REV position and read the SWR. While in the TX mode, tune
L206 (located near the GROUNDING WINGNUT just inside of the amp chasis) untill you achive your lowest SWR reading. You
have just completed the retuning proceedure of the 10 meter ANTENNA INPUT COIL.
If you would like to operate both 10 meters and 12 meters, you may want to tune L206 on a frequency between your
operating fre-quencys on 10 and 12.
Re-solder the 850 volt red wire (with the AMP off and un-pluged). Re-assemble the AMP and enjoy INCREASED POWER
OUTPUT on 12 METERS.
This modification is read 749 times.