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- FL2100B.1
-
- YAESU FL2100B 12 METER MODIFICATION
- by Bill Walton KJ6EO
-
- 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.
-
- Send questions, comments, or other to: KJ6EO @ KJ6EO