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Re: VHF MTR2000 Poor Receive Performance

 

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Jared,

I think your SM allows you to read dBm directly.? Please consider using that measurement unit instead of uV, because it requires less conversions and makes more sense in the end.

Taking your two measurements of 0.4uV and 0.5uV the equivalent dBm for each is -115dBm and -113dBm respectively - or a difference of 2dB.? You stated your duplexers IL is 1.67dB - I consider that pretty darn close.

There is no free lunch.? A duplexer allows you to use one antenna in a duplex system - - at the expense of signal loss.?

In my book - .4uV (-115dBm) bench sensitivity is pretty deaf - but you don't say what you're referencing at that level.? Is that the level where you achieve 12dB SINAD?? 20dB of quieting?? The cracklies are totally gone??

Kevin

On 11/2/2022 8:19 AM, Jared Smudde wrote:

So last night, I measured the MTR at 0.4uV at the receiver port and 0.5uV at the duplexer antenna port.

I injected a signal into the receiver port of the MTR that had just barely had no noise and when I injected it through the duplexer into the repeater, there was noise present. It wasn't heavy noise but it still had noise on the signal.

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