[TenTec] THANK YOU AND APOLOGY - for Billy

[shristov]

Rick - DJ0IP / NJ0IP <Rick at DJ0IP.de> wrote:

> The transmitter's broadband noise will indeed go through the 
> bandpass filter because it is also actually transmitting on that frequency too.


The usual practice is this:

* TX on, say, 14 MHz, transmits through a 14 MHz bandpass filter,
  which attenuates the TX noise on 21 MHz.

* RX on, say, 21 MHz, receives through a 21 MHz bandpass filter,
  which does not attenuate the TX noise on 21 MHz.
  But, equally important, this filter attenuates the main TX signal
  on 14 MHz, thus helping with RX LO noise "reciprocal mixing".


73,

Sinisa  YT1NT, VE3EA