[Lowfer] RX while TX !

[Ed Phillips]

W5JGV wrote:
> 
> I want to be able to RX on 185.3 while I have the TX running at 400
> watts output on 166.5.  The antennas will be separated by about 25 feet.
> 
> Has anyone managed to do something like this?
> 
> I did some preliminary antenna tests this afternoon that seem to
> indicate that it may be possible if it is done with a lot of careful
> construction.
> 
> Any thoughts, comments or whatever?
> 
> 73,
> 
> Ralph   W5JGV - WC2XSR/13

	With a suitable duplexing filter (notch out the 166.5) you should be
able to hook your receiver to the RX antenna without blowing up its
front end.  However, IF you want to hear anything you have to make sure
that the noise sidebands of the 166.5 transmitter are down in the noise
level at 185.3, something which may not be possible.  Using a notch
filter at 166.5 won't affect the 185.3 noise output at all, so you'll
have to do a lot of filtering of the 166.5 output, maybe more than you
can accomplish.

Ed