1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
    Dismiss Notice

Motorola GM300 wide/narrow and 'step' ??

Discussion in 'Ham Equipment' started by MrClean, Apr 24, 2016.

  1. MrClean

    MrClean New Member

    Joined:
    Mar 11, 2016
    Messages:
    29
    Likes Received:
    2
    I setup a GM300 for my truck that is wideband according to the model number.M33GMC29C2AA.



    It accepted all local repeater frequencies in RSS and seems to be working as I can trip them and they sound clear coming in with tones and such.

    Some of them are like 146.835- and 147.285+. My question is does wide band mean these frequencies won't work?

    Just got Tech last week and wide/narrow has me confused with spacing vs steps I think..
     

  2. MrClean

    MrClean New Member

    Joined:
    Mar 11, 2016
    Messages:
    29
    Likes Received:
    2
    I just downloaded the RSS programming manual from the internet.

    On page 4-8 (pg. 72) it says the RX frequency must be divisible by 5khz of 6.25 khz... under the TX page 4-13 (pg.77) it says see your price sheets or manual for valid TX frequencies..

    So I am correct to guess that a freq of 146.835 is good to go??

    I can hit 2 repeaters ending with .835 and .625 just fine and can hear them just fine, the issue is no one is on them to give me a QRK or QRI to confirm...
     
  3. BJ radionut

    BJ radionut Supporting Member and 6m addict

    Joined:
    May 9, 2008
    Messages:
    1,797
    Likes Received:
    951
    http://www.artscipub.com/repeaters/search/index.asp?state=Pennsylvania&band=2

    Set it for wide (receiver bandwidth)

    Spacing: Most repeaters use +/- 600 kHz for difference between the Receiver frequency and the Transmit freq....IE: 146.76- / Receiver is 146.76 / TX is 146.16...IE: 147.15+...RX is 147.15 / TX is 147.715
    there are some "odd" splits but those are normally noted in the Guides.

    Don't forget to add the access tone code to your TX frequency(if required/see guide)...otherwise you may not be able to open the repeater.

    Step: the change in frequency when in VFO mode (before saving to memory) set this to lowest value radio will do .005 kHz...this has no effect once a frequency is stored in memory...only used when manual tuning...

    One final note; Forget the "Q" codes on all voice bands...these are "shorthand" for CW operation and only appropriate on voice bands in Emergency communications...and then only by the advice from "Net Control"
    JMHO...
    Hope this helps
    All the Best
    Gary/W9FNB

    PS: CONGRATS on getting you call 73
     
  4. RonF

    RonF New Member

    Joined:
    Aug 14, 2018
    Messages:
    2
    Likes Received:
    0
    I have a GM300 that has an advertised range starting at 146 MHz. Is it possible to tune it down to 144 MHz?
     

Share This Page

  • About Us

    The WorldwideDX Radio Forum was originally established in 2001. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We are working every day to make sure our community is the best Radio Hobbyist's site.
  • Like us on Facebook

  • Premium VIP Member

    The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Care to buy us a beer? We'd really appreciate it!

    Donate to us!