Yaesu Fl2100 bypass may be stuck ??

Discussion in 'Amateur Radio Amplifiers' started by KG4RSF, Mar 18, 2018.

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  1. WQ4G

    WQ4G Ham Member QRZ Page

    You should be using a well tuned Dummy Load. It must be you I keep hearing tuning up....

    If your antenna is 'well tuned' then why are you using an Auto Tuner? You really should be using a 50 ohm resistive load (a dummy load) to do all testing with.

    Based on what you have described KA9JLM is right. The amp probably has the original capacitors in it and those need to be changed as a matter of preventative maintenance. The HV sag is evidence of the Power Supply caps getting weak. Change them now before you have to scrape them off the insides of the amp.

    Dan KI4AX
    KA9JLM likes this.
  2. G3YRO

    G3YRO Ham Member QRZ Page

    Yes I don't really understand what you are saying . . .

    1. When the Amp is keyed (ie in Transmit mode, with the Relay activated) but with NO RF Drive from your transmitter, what is the Standing Currenet reading?

    2. When you apply drive from your Tx, after initially tuning the Amp at low power, you need to give it 100 watts to get full output from the Amp. Is that what you are giving it?

    Roger G3YRO

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