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Static after unkeying on repeater

UnHumanReactions

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Just curious if anyone knows what causes that burst static when a radio unkeys while on a repeater. Does that have to do with the receiver part of the repeater not catching the reverse burst or having the squelch set too low? Also, why is it inconsistent? Sometimes it's a really long burst and sometimes not at all.

Clips for example: Static Example - Clyp
 

buddrousa

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There are several things that can cause what you say you hear but it is hard to answer without hearing what you are hearing.
Squelch set to close to open.
Desense in the receiver due to duplexers not tuned correctly.
Open band conditions ect.
 

clbsquared

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I listened to the clip you posted and it sounds like the repeater tail. The reason it's inconsistent is most likely because a radio is keying up before you have a chance to hear the tail.
 

buddrousa

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That is in fact a id squak on key up voice traffic plus OPEN SQUELCH at the end. A radio shop needs to adjust the repeater squelch to end the sound.
 

baayers

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I normally read more than post on this forum but this one caught my interest.

The data burst that you hear in each transmission are at the beginning so that is definitely not the problem. It looks as if the squelch tail elimination option on either your radios or your repeater has been disabled. This issue can happen when the repeater has either CTCSS or DCS tones. It is a lot more noticeable however with a DCS system as sometimes the squelch burst can last up to a full second. If you point your radio techs In this direction it is something they can check out and fix easily.
 

mikegilbert

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Was that all on one frequency?

I'm hearing several things on the first transmission:

1. MDC1200 pre-ID
2. A chirp from a voting comparator
3. An RF link closing with a squelch tail
4. The repeater hangtime ending

At :16 I hear a weak signal from a field unit with dispatcher replying through what sounds like an ASTRO Core. Is there a new P25 system being installed, or in use in your area? It sounds like they're patching things together.

The transmissions at :22 with Fleetsync pre-ID also sound like they're going through COR-activated RF links.
 

UnHumanReactions

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Was that all on one frequency?

I'm hearing several things on the first transmission:

1. MDC1200 pre-ID
2. A chirp from a voting comparator
3. An RF link closing with a squelch tail
4. The repeater hangtime ending

At :16 I hear a weak signal from a field unit with dispatcher replying through what sounds like an ASTRO Core. Is there a new P25 system being installed, or in use in your area? It sounds like they're patching things together.

The transmissions at :22 with Fleetsync pre-ID also sound like they're going through COR-activated RF links.
The audio clips were just examples I had compiled to show the long bursts of static when a unit stops transmitting.
 

12dbsinad

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One thing to remember is "reverse burst" is not always compatible between brands. Icom and Kenwood come to mind and can cause squelch clash on a Motorola repeater even though the radio is sending reverse burst.
 

a417

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One thing to remember is "reverse burst" is not always compatible between brands. Icom and Kenwood come to mind and can cause squelch clash on a Motorola repeater even though the radio is sending reverse burst.
...and the "Non Standard Reverse Burst" checkbox was supposed to fix that.

ha.
 
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