Bunin, L. Yailenko
Line: Spravochnic Radiolyubitelya Korotkovolnovika, - 2 Izdanie,
Kiev : Tehnika, 1984.
The PA is designed for ham bands 160- 10- meters. It
provides 200 Wtts CW/ 500 Wtts PEP SSB. Efficiency of the PA is 65- 70%
in depend on used r\band. Figure 1 shows the schematic of the PA.
Four tubes G811 (switched in bridge, grounded grid)
are used in the PA. Four tubes may dissipative 160- Watts
on their plates, so, the PA can work continuously
with 200- Wtts output.
of the PA is closed to 75- Ohm at 160- 10- meters.
RX: Tubes are closed by minus 27-V that is coming by relay
K1. Contacts of the relay switch antenna to X3- Receiver Input.
TX: Grids of the tubes are connected to the ground by
pedal S1, antenna through contacts of Relay K1 goes to PA output.
T1 provides 2x6.5-V at 8- A. It should stand 110- Wtts.
L1, L2, L3, L4 are wound on Russian Resistors MLT- 2 (for sizes see: http://www.antentop.org/009/tst009.htm).
Each inductor contains 5 turns and coiled by wire in dia 0.62-
mm (22- AWG).
choke L6 is wound on porcelain form in dia 20- 25-mm and 150-mm
length. It contains 150 turns, 50 turns at plate side is wound
with gap 0.5- mm. Was used wire in dia 0.35- mm (27- AWG) in silk
L7 and L8 is commercial made from old military
equipment. May be used any suitable chokes.