RadioBanter - View Single Post - how to wind 10mH inductor for AF diplexer?

March 9th 06, 03:46 PM posted to rec.radio.amateur.homebrew

wrote:

I understood that it is a good idea (or even mandatory?) to follow DBM
with a diplexer.

My question is: how on earth should I wind those 10mH inductors?

I'm curious, is the virtual ground at the input of a modern
high-bandwidth op-amp (set up with unity or only moderate gain) good
enough at frequencies of concern that terminating the mixer into this
with a resistive network would produced the needed lack of RF
reflection?

I know that in terms of the audio frequencies, op amps with R and C
passives have long been a viable option to big inductors - but can they
now satisfy the need to terminate the RF components?