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G0FTD > QRP 15.06.05 21:48l 19 Lines 564 Bytes #999 (0) @ WW
BID : EC0811G0FTD
Read: GUEST DG9NBR
Subj: Re: Help with PA circuit
Path: DB0FHN<DB0RGB<DB0SL<DB0FSG<DB0AAB<F6KFT<LX0PAC<DB0NDK<DB0ACH<DB0PKE<
DB0RES<ON0AR<7M3TJZ<PY1AYH<CX2SA<GB7CIP<GB7SXE
Sent: 050615/0026Z @:GB7SXE.#38.GBR.EU #:33144 [Hastings] FBB7.00i $:EC0811G0FT
From: G0FTD@GB7SXE.#38.GBR.EU
To : QRP@WW
ZL4AJS wrote:-
> I have been trying to design a solid state broadband PA stage for my
> latest QRP transceiver, but have hit a 'brick wall' at about 1W! I want
> it to have an output of around 5W,
I've just seen the 7plussed circuit diagram.
If you want to keep the transistors all the same type then just add
extra transistors in parallel but include a small resistance in the
emitters (about 1 ohm) before they reach the 0v line.
There's an excellent article about such techniques on the G-QRP CD Rom.
- Andy -
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