Looking for ideas, schemes.
Have a good (now that I fixed it) working Central Electronics 600L amp.
Want to use it with a transceiver.
It was designed for use with the CE Multi-Phase 20V exciter.
The schematic is attached.
The amp has "Input", "Output" and "Antenna".
"Antenna" was intended to be used with a receiver.
The tube is set up for
grid block keying/control.
There are no "T/R" relays internal.
Stock, it would have been used with an external Dow Key relay going to
the receiver...
So, the short version of what it seems is needed goes something like this:
(working
backwards from the keyed up state)
- drop exciter RF
- dump in grid block (turn off tube)
- switch "T/R relay" - transceiver for receive to Antenna (jack or coax)
Keying up:
- connect ("T/R") amp to coax/
disconnect receive line from coax - transmit line to input
- send RF from transceiver
- unkey grid block (enable amp)
Of course there are a few variations on the connection scheme.
The transceiver could stay connected to the "Input" on the amp at all times,
BUT the "loop back" from the Antenna jack or alternately direct to the coax
(see schematic)
must not arc, pass too much RF even on a transient, lest
the amp oscillate and/or the receiver input get fried.
Part of the circular nature of the thinking revolves around what keys what.
As in, one could "key" the amp and have that key the transceiver, or key some
sort of external relay, etc...
Assume I have Dow Key relays, and electronic T/R, suitable open frame relays...
but the idea is that the transmit jack and the receive port on the transceiver is
the same, and likely switches WAY faster than the linear or the Dow Key can.
I'd greatly prefer to NOT have to buy a uproc operated "sequencer" and really would
prefer some more basic approach. Transistors, and even some 555 timers or opamps
seem more robust to me. Don't mind building a circuit with relays...
Any ideas on how to make this go?
_-_-
PS. patent is attached for your reading enjoyment!