Need schematic
Posted: Sat Dec 17, 2005 4:53 pm
Need the schematic for the Electronic T/R Switch that was in the older ARRL handbooks. Does anyone have it?
from 1960 handbook page 253.
tube is a 6c4 triode.
left to right.
input can be a coax T connector from transmit output Teed to antenna.
rf from xmiter triggers circuit.
input is 47mmfd in series with shielded input line (coax).
goes to pin 6 of tube with 1 meg half watt to ground.
pins 3 and 4 are 6.3 volt fil
pin 7 cathode 520 ohm 1/2 watt to ground
pin7 .01 mfd in series to shielded coax to recvr ant input.
pin 1 and 5 are plate has .01 mfd to ground and 2,.2k 1/2 watt to 150 to 250 volts dc plate voltage.
the 6c4 acts as a cathode follower amp to the antenna signal on recieve.
on transmit the rf cuts off the 6c4 so no signal to the reciever.
next page has a circuit with a 6ah6 ...
can copy and send both . if you cant draw from above description.
don. call sign at aol...