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Camden County, GA Scanning Changes

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In other Camden County radio news, the VHF public safety radio systems in Camden County recently (this week) switched from regular FM to narrowband FM (NFM) transmissions; transmission remain analog.  In addition to going narrowband, they also moved to a new output frequency on the Camden County S.O. repeater in order to alleviate interference with the St. Marys P.D. repeater.  The new output frequency for the Camden County S.O. repeater is 151.385 instead of the old 159.165 which interfered with the St. Mary’s P.D. repeater.

With the exception of reprogramming the one frequency in your scanners, all you’ll have to do for Camden County frequencies is change the receive mode from FM to NFM.  If you have an older scanner that doesn’t have the NFM setting, don’t worry – you’ll still be able to hear them, it just won’t sound quite as good as it did before.

If you’re interested in such things, you can see the license modification information for the S.O. repeater here.


8 Comments

  1. Bhs779 says:

    Interesting, I would have thought by now Camden would have teamed up with Glynn and expanded that simulcast system. Any ideas on that?

    • KF4LMT says:

      As I understand it, that will eventually happen. Apparently funding the expansion is an issue for Camden County. Currently, the SEGARRN is in use in Bryan, Bulloch, Chatham, Liberty, and Glynn with the two future expansions that I’m aware of being Camden and Effingham. Effingham is in the same boat as Camden seems to be – short of funding.

  2. E232 says:

    How can they be transmitting in analog when they are on Narrowband?…I’m guessing the Narrowband only has to do w/ the recieve aspects of the radio, I thought it had to do w/ both transmit and recieve aspects of it. Could you briefly educate me on this, as it does not really make sense to me what you stated..Also as far as the S/O repeater goes, the input frequency continues to remain the same of 156.060 MHz correct?

    • KF4LMT says:

      ES32,

      Narrowband and analog are two separate issues. Narrowband has to do with the deviation of the signal, or how wide the signal is. Narrowband is the width of the signal, Analog is the type of modulation the signal uses. FM uses 5 kHz deviation, NFM uses 2.5 kHz deviation. Camden County’s radios are now using 2.5 kHz deviation, therefore they are NFM both transmit and receive. Analog transmissions can be used on NFM just as they are on FM. Digital transmissions can also be used 2.5 kHz.

      The reason for the change is FCC compliance. All commercial users (public safety and government included) must be narrowband compliant (using 2.5 kHz deviation) by January 2013. You can therefore look for others to be changing in the near future.

      The reason for the switch from 5 kHz deviation to 2.5 kHz deviation is to open up more spectrum for use. Using narrowband FM allows you to operate more “channels” within the same piece of spectrum.

      • E232 says:

        okay, I understand now for the most part..thank you for helping me out. I’ve read up about the Narrowband stuff before, and it says the spacing/deviation is 12.5 kHz for Narrowband and 25 kHz for Wideband. So what is the significance of that?, is 12.5 kHz equal to that of 2.5 kHz and likewise 5 kHz equal to that of 25 kHz..

  3. KF4LMT says:

    Spacing and deviation are two different things but they are related. Spacing has to do with the space between “channels.” Deviation has to do with the width of the signal. FM requires 25 kHz spacing because of the wider width of the 5 kHz deviation. NFM requires less spacing between “channels” because the deviation is narrower (2.5 kHz). If you tried to use 12.5 kHz spacing with 5 kHz deviation, you would run into interference problems if you tried to use 2 “channels” next to each other in frequency.

    Hope that makes sense…

  4. E232 says:

    Yeah makes perfect sense now..Thank you. So what exactly do they do to the individual radios themselves, when they go in and reprogram them..what are the processes involved, I’ve read its a very simple procedure when they do it and takes no time at all hardly

    • KF4LMT says:

      The radios are simply connected to a computer and reprogrammed with appropriate software if they are narrowband capable. If the radios are older models that aren’t narrowband capable, they have to be replaced with ones that are.

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