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VE2EOT

Joined: Wed, Jan 5th 2022, 15:22 Roles: N/A Moderates: N/A

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Order / Gain Structure of RX Front End? Jan 6th, 10:50 3 809 on 6/1/22

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Order / Gain Structure of RX Front End? VE2EOT on 6/1/22
Thanks for the reply. I realize that every design has trade-offs. (very experienced non-RF designer here) But I'm looking for some starting points and rules of thumb at least to get me started.

A few things seem obvious, like not having too much gain up front where the amp could be overloaded before any ability to attenuate. Or having gain before any IF stage / filtering would help to filter out strong unwanted signals. I assume the first amp(s) bring the signal up to the level required by the first mixer, and then most of the gain can go after that?

I will do some experiments but just want to get a sense of the right way to approach things.
Order / Gain Structure of RX Front End? VE2EOT on 6/1/22
Hey folks,

I'm working on a homebrew design for an HF transceiver and there seem to be just as many approaches to receiver design as there are radios out there.

Are there any best-practice rules on the order of blocks / gain settings for receiver front ends? What is the normal thought process that goes into deciding how much gain to put right after the antenna, after filters and attenuators, after the IF mixer, etc.?

I'm working on a basic block diagram for my project and feel funny just trying to arbitrarily stick things together.

73 VE2EOT

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