antentopSince2 July

Ham Spirit
Antentop Free E-Magazine
Free Choice

 

 

Free Antentop Amateur Open Book
Antentop Album
Antentop Survey

 

 

 

Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

Special page devoted to

Linear Power Amplifier on G811

Custom Search

 

ANTENTOP- 01- 2010, # 012

Linear Power Amplifier on G811

 

 

 

S. Bunin, L. Yailenko

 

Credit Line: Spravochnic Radiolyubitelya Korotkovolnovika, - 2 Izdanie, Kiev : Tehnika, 1984.

(“Reference for Ham”)

 

 

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- 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.

Transformer T1 provides 2x6.5-V at 8- A. It should stand 110- Wtts.

Inductors 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).

Plate 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.

Chokes L7 and L8 is commercial made from old military equipment. May be used any suitable chokes.

 

 

 

 

Figure 1 Schematic of the Four- G811 PA

 

http://www.antentop.org/

Page 87

 

87 88

 

 

QRP Transceivers and PA from Accessible Parts IP for QRP Antentop Book Radio Antenna Engineering Book Antentop Printed and e- magazines
 


 

 

Just for Fun:

Map IP Address
Powered byIP2Location.com

Thanks for your time!

Last Updated:

August 2, 2016 18:21

Antentop Home Page

Free Antentop Open Book

2003entop