xts5000 RX sensitivity optimization

[TrunkLatcher]

Hello,
I have a question regarding whether the "squelch (fine tune)" option in the conventional personality windows of the CPS have any effect on digital P25 operation. I can't seem to find the answer in the help. I am actually running a UHF R1 into the R2 band for receive only operation. Although this is not an ideal method for sensitivity, I still am attempting to optimize it as best as possible.

Any other suggestions of improvement that don't require tuning/aligning are greatly appreciated.

Thanks.

 

[RKG]

Squelch and sensitivity are two different issues.

Sensitivity of a receiver is its ability to detect valid wave form at a low received signal strength. Sensitivity of a receiver is pretty much fixed by its design and construction. (Sensitivity of a system is also affected by the gain of the antenna, quality of the feedline and connectors, and similar issues.)

Squelch is the level beneath which the radio (per the programmer's instruction) declines to open audio. Squelch has basically two functions in a contemporary FM radio: (a) to block audio amplification of the "white noise" than an analog FM product detector produces in the absence of an incoming RF signal and (b) to block audio on stations whose signal strength is so low as to be not useful (and which, therefore, tend to look close to the same annoying white noise).

So far as I am aware -- and it is not something I've studied closely -- digital audio gating is based on BER, not incoming signal strength. Whether adjustments to maximum permissible BER would be called "squelch" is, to me, an open question.

 

[TrunkLatcher]

I was a little unclear in my op. I understand the point you brought up about sensitivity vs. squelch. I am aware of the difference.

I actually meant to more clearly express that I wanted help not only on whether the Squelch Fine Tune has any affect on digital operation but also on any other enhancement suggestions that have to do with the separate matter of sensitivity as long as they don't involve the tuner (CPS tweaks only). Thanks for your help.