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?

 

Tom G6PZZ

 

From: CrossCountryWireless@groups.io <CrossCountryWireless@groups.io> On Behalf Of Chris Moulding
Sent: 25 September 2020 20:08
To: CrossCountryWireless@groups.io
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.

Regards,

Chris

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