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. Input resistance 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-
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:
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 insulation.
L7 and L8 is commercial
made from old military equipment. May be used any suitable chokes.