Re: Variable gain preamp anyone?

Tom Crosbie G6PZZ

Hello Chris,

I appreciate the design problems you were faced with in choosing 5V as a source for a Bias-T PSU and the performance jump when using 12V. It’s quite a dilemma as generally the quest is for as much gain as possible and best 3rd IP. I would contend that in real world SWLing, that the maximum performance isn’t always necessary, especially with a very strong adjacent channel which is always in the passband of the amplifier.


I was wondering if varying the voltage and thus the gain could be turned into a feature. Could this help in optimising the gain throughout the receiver?




From: <> On Behalf Of Chris Moulding
Sent: 25 September 2020 20:08
Subject: Re: [CrossCountryWireless] Variable gain preamp anyone?


Hi Tom,

I've not tried the Loop Antenna Amplifier + with a variable power supply so I'm not sure how much gain variation you would get.

It's now on the list of things to do next week.



Join to automatically receive all group messages.