396 modulation setting

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ampulman

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Been trying to tweak my P25 reception to improve problem reception.

I've noted that the modulation setting for the troubled channels are set to 'auto' but receive as NFM. Would setting such a channel to NFM reduce/eliminate some of the problems, e.g., hesitation, clipping, etc.?

AM

If such a channel indicates
 

RoninJoliet

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I get much better reception here on Starcom with the digital set to "FM" as stated by the Uniden rep on these boards....Also here on the Starcom IL System "Auto 8" works best on the digital setting...700/800 digital needs a very good signal to be processed and seeing at least 3-4 signal bars and using the RS 800 rubber duck is a must.....Also, using outdoor antennas need very short run low loss coax such as RG6u/RG11....My opinion only....
 

ampulman

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RoninJoliet said:
I get much better reception here on Starcom with the digital set to "FM" as stated by the Uniden rep on these boards....Also here on the Starcom IL System "Auto 8" works best on the digital setting...700/800 digital needs a very good signal to be processed and seeing at least 3-4 signal bars and using the RS 800 rubber duck is a must.....Also, using outdoor antennas need very short run low loss coax such as RG6u/RG11....My opinion only....

Thanks. I've been waiting for your response. While my question was directed at conventional frequencies, I'm also interested in the same result for trunked systems.

I monitor 2 sites (as different systems in my 396) of the county TRS which are MOT type II Smart Zone. Just checked the modulation setting on both and interestingly, one is set to auto; the other, FM. I did not manually set either one. Come to think of it, the one (FM) does seem to 'come in' better.

As far as the conventional frequencies, they are Federal and the transmissions tend to be short, making tweaking difficult. They do, however, indicate their modulation mode.

The MOTs on the otherhand, do not. Is it a given that all MOTs are using FM modulation? Did not see any reference in the database.

AM
 

RoninJoliet

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The MOT and EDACS systems here are put in in "FM", i have some Federal and one digital APCO25 ham conv- freqy in the 396 and there set to FM and NO PL and work fine on AUTO 8.....It will not decode with a PL installed...I monitor on 155.58 conv-digital "Kenosha Wisc on AUTO8 and FM and they come in perfect when skip is rolling here in the Chicago area....
 

ampulman

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RoninJoliet said:
The MOT and EDACS systems here are put in in "FM", i have some Federal and one digital APCO25 ham conv- freqy in the 396 and there set to FM and NO PL and work fine on AUTO 8.....It will not decode with a PL installed...I monitor on 155.58 conv-digital "Kenosha Wisc on AUTO8 and FM and they come in perfect when skip is rolling here in the Chicago area....

Thanks again.

AM
 
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