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Measurements >> RF Measurements >> C/N of Low-IF Receiver with small Gain
https://designers-guide.org/forum/YaBB.pl?num=1125934832

Message started by pancho_hideboo on Sep 5^th, 2005, 8:40am

Title: C/N of Low-IF Receiver with small Gain
Post by pancho_hideboo on Sep 5^th, 2005, 8:40am

Hi.

How do you measure C/N or NF of Low-IF Reciever which doesn't have much Gain ? :-*

Generally Noise Source for NF Meter is valid from 10MHz.

I can't evaluate C/N reliably using Spectrum Analyzer since
Receiver doesn't have much Gain.

Is there any practical or reliable instrument in commercial ?

Noise/Com Inc. has good solution ?
http://www.noisecom.com/

Title: Re: C/N of Low-IF Receiver with small Gain
Post by cybq on Jun 8^th, 2006, 11:24pm

try to use enough low noise floor spectrum analyzer, with addition of RF probe (it is a hign input impedance device).

Title: Re: C/N of Low-IF Receiver with small Gain
Post by keplin on Aug 5^th, 2006, 11:38am

How about using a really low resolution bandwidth on the Spectrum Analayzer and using a Noise Source with an ENR of say 15dB?

This should work well.