36 lines
1.7 KiB
Plaintext
36 lines
1.7 KiB
Plaintext
FL2100B
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YAESU FL2100B 12 METER MODIFICATION
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by Bill Walton KJ6EO
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If you do not mind losing 10 meters on your FL2100B, this quick mod should
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have you up and running on 12 meters with near full power output.
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Place the FL2100B on its side with the LOADING control nearest the surface
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that the amp is setting on. Make sure that the amp has been UNPLUGED and that
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the PLATE VOLTAGE has dissipated before you proceed. Remove the screws that
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hold the bottom cover on and remove the bottom cover of the amp.
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Set the BANDSWITCH to : 10
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Set the PLATE CONTROL to : 9
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Set the LOADING CONTROL to: Fully counter-clockwise
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Disconnect the 850 volt red wire that leads from the transformer to the DIODE
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BOARD (located right behind the TRANS - OPERATE switch. Install a SWR bridge
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between the EXCITER and the FL2100B. Tune your HF rig to 24.950. Turn the
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FL2100B on and place the amp in the OPERATE MODE. Excite the the AMP with an
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AM signal, enough so that you can calibrate (set) your SWR meter. Place your
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SWR meter in the REV position and read the SWR. While in the TX mode, tune
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L206 (located near the GROUNDING WINGNUT just inside of the amp chasis) untill
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you achive your lowest SWR reading. You have just completed the retuning
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proceedure of the 10 meter ANTENNA INPUT COIL.
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If you would like to operate both 10 meters and 12 meters, you may want to
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tune L206 on a frequency between your operating fre-quencys on 10 and 12.
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Re-solder the 850 volt red wire (with the AMP off and un-pluged). Re-assemble
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the AMP and enjoy INCREASED POWER OUTPUT on 12 METERS.
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Send questions, comments, or other to: KJ6EO @ KJ6EO
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RELAYED BY N0KGX...GENE
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