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G8MNY > TECH 07.03.26 19:23l 53 Lines 2087 Bytes #7 (0) @ WW
BID : 53749_GB7CIP
Read: GUEST
Subj: Using 2 HF PAs
Path: JH4XSY<N3HYM<N2NOV<VE2PKT<VK4OT<VK6ZRT<GB7CIP
Sent: 260307/1014Z @:GB7CIP.#32.GBR.EURO #:53749 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (New Aug 13)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
At an 8 day Ham Summer Camp I needed to use 1 of 2 HF PAs for /P. One was a
500W Transistor PA floated on a large battery that allowed just a small petrol
650W generator to keep the batteries topped up, and the other was a Valve Amp
used in the colder nights and that needed much bigger generators (2.3 / 7kW).
I looked at the 2 possible connection systems...
FULLY SWITCHED SERIES RF & TEED CONTROL LINES
ﾚﾄﾄｿ
ﾚﾄﾄﾄﾄﾄｴHFｳ ﾚﾄﾄｿ ﾚﾄﾄｿ
ﾚﾄﾄﾄｿ__/. ﾚﾄﾄﾄｴPAﾃﾄｿ ﾚﾄﾄﾄｿ_________ｳHFｳ_____ｳHFｳ ﾚﾄﾄﾄｿ
ｳHF ｳRF : ｳ ﾚﾄｴ1 ｳ ｳ ﾚﾄﾄﾄｿ ｳHF ｳRF _____ｳPAｳ ___ｳPAﾃﾄｴATUﾃﾄ
ｳ ｳ____/. ｳ ﾀﾄﾄﾙ \__ｳATUﾃﾄ ｳ ｳ___ｳ ﾚﾄ)ﾄｴ1 ｳ ｳ ﾚﾄｴ2 ｳ ﾀﾄﾄﾄﾙ
ｳRigｳPTT: : ｳ ﾚﾄﾄｿ ｳ ﾀﾄﾄﾄﾙ ｳRigｳPTT ｳ ｳ ﾀﾄﾄﾙ ｳ ｳ ﾀﾄﾄﾙ
ｳ ｳ______/..ｳHFｳ ｳ ｳ ｳ_____ｳ ﾀﾄﾄﾄﾄﾄﾄﾙ ｳ
ﾀﾄﾄﾄﾙALC: :...ｳPAﾃﾄﾙ ﾀﾄﾄﾄﾙALC ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
:.....ｳ2 ｳ
ﾀﾄﾄﾙ
The switched system is complex, unless relays are used.
The series and teed system assumes PA2 can handle PA1 Tx power in through mode!
Steering diodes my be needed to isolate the powered off PA from affecting PTT &
ALC lines...
ﾚｴ<ﾃﾄﾄPA1 PTT Test PTT interaction by keying up
PTTﾄﾄｴ Tx + PA & seeing if connecting the
ﾀｴ<ﾃﾄﾄPA2 PTT unused PA has any affect on Tx/Tx.
Add diodes if there is any affect.
ﾚｴ>ﾃﾄﾄPA1 ALC Test ALC interaction by setting Tx
ALCﾄﾄｴ + PA to 100W & adding the turned
ﾀｴ>ﾃﾄﾄPA2 ALC off PA. I found no power change so
steering diodes were not needed.
Of course NEVER enable both PAs together! However the ALCs will work overtime
if you accidenty do!
See my Tech bul "T500 M 12V 500W HF Linear", "PTT line for Drake L-4B PA", &
"ALC line for Drake L-4B PA".
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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