Re: Variable gain preamp anyone?
Tom Crosbie G6PZZ
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: CrossCountryWireless@groups.io <CrossCountryWireless@groups.io> On Behalf Of Chris Moulding
Sent: 25 September 2020 20:08
Subject: Re: [CrossCountryWireless] Variable gain preamp anyone?