Not quite sure what you're trying to do, but here's some links on implementing an RF gain control.
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/g/BITX20/topic/4238539???
On Sun, Jun 11, 2017 at 09:21 pm, John Smith wrote:
I previously made the FLDGI CW keying circuit, and it works great. But better than that is using the rig controls for serial port PTT. Tests with the relay module and the Usb to serial adapter Indicates it's working very well. Next is the audio. I plan to use the Easy Digi schematic design for the audio connections with 600ohm audio transformers, and a 2kR across the lines and a 104C on the + line, of the radio side. The only hard part seems to be wiring all those stereo audio mini jacks. 3 on both the interface box, and the radio enclosure. Audio in, out, and PTT, and hard wire the audio adapter. Plus Allard's new wires from the Nano.
Has anyone thought about RF signal attenuation? I tried a 240ohm resistor inline with the antenna to better handle the bigger stations near by. It gave me the results I was looking for, but again it seems too easy for a proper solution. If there is nothing wrong with that, I might use a switch to bring it in and out of circuit.
I just happened to think that the attenuation would be both ways. Humm.
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