Re: Uniden BCT15X - Cutting out on weak signals!


John Svensson
 

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From: main@Uniden.groups.io <main@Uniden.groups.io> On Behalf Of robert johnson
Sent: Monday, April 20, 2020 09:22
To: main@Uniden.groups.io
Subject: Re: [Uniden] Uniden BCT15X - Cutting out on weak signals!

 

Its definitely an issue with the scanner - Bought it new a few years ago - Nobody has been inside - Close Call / Weather Alerts / are off - Priority Channels may have something to do with it Unsure

Thanks for all the replies - I'll get it fixed sometime

Rob United Kingdom..

 

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From: main@Uniden.groups.io <main@Uniden.groups.io> on behalf of Rick Bates, NK7I <Rick.NK7I@...>
Sent: Saturday, April 18, 2020 6:13:47 PM
To: main@Uniden.groups.io <main@Uniden.groups.io>
Subject: Re: [Uniden] Uniden BCT15X - Cutting out on weak signals!

 

Robert,

There are a few basic reasons that the signal can cut out.  Here are some (not in any order)...

1)  It's THAT weak.

2)  The squelch is too restricted.

3)  If it uses CTCSS and it's weak, the receiver may not capture enough audio to allow an open squelch (try disabling CTCSS).

4)  A local transmitter on/near the frequency wanted is blocking what you want to hear.  This may be simply near the frequency of interest but strong enough that the AGC (part of the receiver chain) dials down the sensitivity (it can't manage signals too loud otherwise).

5)  The bandwidth of the signal may exceed the setting of the receiver, i.e. you're listening in NFM but the signal is WFM and it's going out of the bandpass of the receiver.

6)  Local noise sources (LED lights, neon lights, wall wart power cubes, many electronics) may cause interference.

If there is a pattern to the dropping out, that may assist in knowing the reason.

One quick test, try another receiver and see if it continues to drop out.

A pre-amplifier at the antenna may boost the signals (and noise sources) well enough to help, BUT if you're also hearing very strong signals, it can be overdriven too (swamped is the usual term).  It can also be useful to overcome line loss in the antenna feed (which is why you put a receiver pre-amp AT the antenna).

If it's something you need to hear more consistently, a directional antenna may help (at the cost of less hearing in other directions).  Using a directional antenna, one 'listens' in that direction and they tend to null out noise sources in the other directions.

Using a higher gain antenna for that band may also be useful.

Good luck,
Rick NK7I

 

On 4/18/2020 8:25 AM, robert johnson wrote:

Hi,

Can anyone help me - I own a Uniden BCT15X

Strong signal are great but the more distance weaker signals cut in and out - Has anybody else had this issue? Its not the antenna or coax as it's been checked on a MFJ Analyser - Is there a way of getting rid of the weak signal cutting out? I bought the scanner from new - This issue is really annoying - Any ideas will be much appreciated

73 Robert United Kingdom

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