Posted: 10/16/2010 9:38:48 PM EDT
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I have a Motorola XTL 2500 in my assigned police car. I was checking all of the different channels I have and noticed one said "HAMM". Perhaps someone misspelled "Ham", don't know but is it possible for this radio to transmit to other Ham operators? If it can what channel am I possibly talking on?
Frequency range from Motorola: 136-174 MHz; 380-470 MHz; 450-520 MHz; 764-870 MHz Frequency band: VHF, UHF, 700 MHz, 800 MHz |
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The most popular amateur band is the "2 meter" band at 144 to 148 MHz which would be covered by a VHF high band LMR radio. The other option would be a "70 centimeter" band frequency between 420-450MHz (probably between 440-450). No amateur allocations at 700 or 800MHz.
It's probably a local amateur repeater frequency which are ubiquitous on both of those bands. Might be a local skywarn group on that repeater or something like that which they want to be able to monitor. The channel may be programmed in as receive only. If you don't know what frequency band you are on, give us the description and approximate dimensions of your mobile antennas and we can tell you the band you are on. |
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Quoted:
The four taller antennas are for lojack. http://img.photobucket.com/albums/v720/trdvet/Mobile%20Uploads/100MEDIA_IMAG0071.jpg Quoted:
The three smaller ones are 2" height 1" diameter Lojack is a doppler direction finder at the high end of the VHF high band. Doppler DF uses four antennas in a square like that, they are switched rapidly between antennas to find the direction of the signal source. The remaining antennas... none are for VHF. Those are reduced size antennas, the two in the front look like Antenex brand (Laird) and the back one is a Maxrad (PCTel). There are antennas like that for UHF, but they are a little taller than the ones you have... what is there is some combination of 700, 800, cellular phone bands either single or dual band, maybe 900 or 2.4gHz data. If you unscrew them from the mounting bases they usually say on the inside what they are for or at least have a part number. The Antenex in that style I know make good antennas for cellular phone use and the 800 LMR should be good also. I'm told the 2.4gHz ones work well too. If you're on a 700/800 trunking system it might well have interties out to the national LE frequency, other mutual aid frequencies, etc, and they may have a monitor on an amateur frequency for skywarn or RACES stuff. |
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Quoted:
I have a Motorola XTL 2500 in my assigned police car. I was checking all of the different channels I have and noticed one said "HAMM". Perhaps someone misspelled "Ham", don't know but is it possible for this radio to transmit to other Ham operators? If it can what channel am I possibly talking on? Frequency range from Motorola: 136-174 MHz; 380-470 MHz; 450-520 MHz; 764-870 MHz Frequency band: VHF, UHF, 700 MHz, 800 MHz i guess, put it in your scan bank and listen to it. and see what comes across. if it is a ham repeater, and a popular one, it should come to life once in a while. or ask your superivor or radio guy, he'll know. how long have you had the squad with this HAMM labled channel?? if it is a ham repeater or simplex freq, it might be receive only. Ask around i'm sure your car isn't the only one with this in. |