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Control Channel Scanning

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  • James F. Boehner, MD
    Quick question- If you have two towers, one stronger (and first in the control frequency list), and always locked on first, is there a way to move to the other
    Message 1 of 55 , Mar 30, 2009
    • 0 Attachment
      Quick question-

      If you have two towers, one stronger (and first in the control frequency
      list), and always locked on first, is there a way to move to the other tower
      control frequency without locking out the stronger tower control frequency?

      '73 de Jim N2ZZ



      ----- Original Message -----
      From: "Uniden UPMan" <uniden.upman@...>
      To: <BCD396XT@yahoogroups.com>
      Sent: Monday, March 30, 2009 11:50 AM
      Subject: Re: [BCD396XT] Control Channel Scanning


      1. It will have no detectable affect on scan speed.
      2. It only knows a system frequency is a control channel by detecting
      control channel data on the frequency.
      3. Correct. Control channel only has been the norm for several years.
      UPMan




      ________________________________
      From: J. Newell <john.o.newell@...>
      To: BCD396XT@yahoogroups.com
      Sent: Monday, March 30, 2009 10:38:15 AM
      Subject: Re: [BCD396XT] Control Channel Scanning



      Three things here.

      1. I assume that programming only control channels will materially speed the
      effective scan rate, since the voice channels aren't scanned.

      2. I assume that the scanner has no way of knowing which programmed
      frequency is a control channel, so the solution is to program only control
      channels.

      3. Hasn't it been true for quite a while that you only needed to program the
      control channels? In other words, this isn't a recent change in the Uniden
      scanners?

      Thanks

      John Newell

      ----- Original Message -----
      From: "johnstark" <johnstark@earthlink .net>
      To: BCD396XT@yahoogroup s.com
      Sent: Sunday, March 29, 2009 10:17:38 PM GMT -05:00 US/Canada Eastern
      Subject: Re: [BCD396XT] Control Channel Scanning

      Program all control channels, the scanner will use the active channel on
      it's own.

      JOhn

      ----- Original Message -----
      From: "Brian Hall" <bhall007@hotmail. com>
      To: <BCD396XT@yahoogroup s.com>
      Sent: Sunday, March 29, 2009 7:08 PM
      Subject: [BCD396XT] Control Channel Scanning

      > I'm still waiting for my BCD396XT, and in the meantime, I'm having fun
      > programming stuff in to FreeSCAN. I've never had a scanner capable of
      > scanning a trunked system on just the control channel. On RR, the system
      > I'm following has a main control channel, and an alternate control
      > channel.
      > Should I program both frequencies into the system and select the Control
      > Channel Only option in FreeSCAN? Will the BCD396XT search for any control
      > channel signal on any of the programmed frequencies and follow the trunked
      > system that way?
      >
      >

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    • J. Newell
      Thanks for the correction! John ... From: Uniden UPMan To: BCD396XT@yahoogroups.com Sent: Thursday, April 2, 2009 3:41:13 PM GMT
      Message 55 of 55 , Apr 2, 2009
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        Thanks for the correction!



        John


        ----- Original Message -----
        From: "Uniden UPMan" <uniden.upman@...>
        To: BCD396XT@yahoogroups.com
        Sent: Thursday, April 2, 2009 3:41:13 PM GMT -05:00 US/Canada Eastern
        Subject: Re: [BCD396XT] P25 Low Pass Filter

        It actually gets the DSP up close to 100% utilization so can degrade P25 decode performance. Scan speed is unaffected.
         UPMan

        ________________________________
        From: J. Newell <john.o.newell@...>
        To: BCD396XT@yahoogroups.com
        Sent: Thursday, April 2, 2009 2:26:28 PM
        Subject: Re: [BCD396XT] P25 Low Pass Filter


        I thought I'd read somewhere that the extra CPU usage may slow down the scan speed?  I might be mis-remembering.  =%^(

        I haven't tried enabling it.  I assume it doesn't get rid of that slight digital "burbble" effect that characterizes digital signals if you don't have a full-bore signal?

        John

        ----- Original Message -----
        From: "MCH" <mch@...>
        To: BCD396XT@yahoogroup s.com
        Sent: Thursday, April 2, 2009 2:02:53 PM GMT -05:00 US/Canada Eastern
        Subject: Re: [BCD396XT] P25 Low Pass Filter

        That could be encrypted TGs that the GRE scanners try to decode. This is
        something completely different. I've never heard of a high pitched noise
        problem on the GREs.

        This would only affect 'ringing' when you're actually hearing audio.

        Regardless, it's probably something that wouldn't hurt having enabled.

        Joe M.



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