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Grid circuits for RF power amplifiers
I need some information on an appropriate input circuit for a small RF power
amplifier using a 2E26 operating in the HF region. Output would be about 27 watts. Drive input power about 0.12 watts. I want the input circuit of the PA to present a 50 or 75 Ohm load to the driver (the exciter - probably a CW QRP rig - will supply about 0.12 watts). Perhaps (I muse) it would be good, (certainly it would be convenient) if the input circuit was NOT a tuned input circuit, but see below. Questions (that incidentally show my thinking): Can anyone point me to a website that gives the design data for an appropriate circuit given the things I have mentioned? Is it okay to have an untuned grid circuit? I muse no problem if the exciter has a pi-network output circuit. I just wonder that if the exciter uses a pi network, if that would represent both the exciter anode/collector tank circuit, and the grid tank circuit. (So, really there would be a tuned input circuit - the output pi-network of the exciter). (Just shows I know nothin', I'm not even certain whether solid stage rigs use Pi-networks to match with the load). Any thoughts on biasing arrangement - fixed bias, drive bias, or cathode bias? (Perhaps fixed bias is best - no need for a clamp valve). Grid bias needs to be about - 45 volts. Muse that a simple RF choke supplying the bias to grid would suffice. So, basically, I want to be able to plug a QRP rig into the PA, tune up the QRP rig and the plate circuit of PA, and that's it. |
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