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Transmission ID?

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hockeyref2

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Joined
Mar 26, 2002
Messages
176
Location
Northern MI
Hello,
Hopefully this is posted in the proper location..

I have some repeaters in the UHF business band (451/456 mhz). I am getting a transmission of some sort coming over the input side of one of the repeaters. It does not appear to have CTCSS/DCS tone and so repeater does not repeat it..... Of course it will interfere with users when they transmit on that repeater however....

It usually lasts a second or so, and comes at 'random' intervals. Sometimes its hours,sometimes its every few minutes. Any idea on what this is? Screenshot from SDR# and a .wav file in a .zip file...

There is nothing that I can see in current FCC licenses that makes any sense..
Thanks for your thoughts and ideas!
 

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TampaTyron

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Feb 1, 2010
Messages
895
Location
Tampa, FL
Sounds like a differential gps transmitter used in land surveying. Basically, these survey companies buy a box that comes with 10-16 channels and a note saying "get licensed". Very few get licensed. So, you end up chasing these guys around. I find that if you DF to their transmitter, it is usually a gps antenna on a tripod with a differential box and a few car/deep cycle batteries. Typically, there is no one near the box and if you disconnect power, they show up fast. TT
 
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My cousin ran into one of those, finally got in touch with the owner who just changed channels.
Local Goodwill has a Ritron alert system with a canned message about 'customer assistance needed at the fitting rooms'.
I went in and asked if they had a license, got the deer in the headlight look.
 

hockeyref2

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Joined
Mar 26, 2002
Messages
176
Location
Northern MI
Thanks! I wonder if its for a gas well or something? I found one expired license using the '6.1 meter rule' but most of their locations are 150+ miles away. A few other 'local' licenses but they are just narrowband FM...

I've never done RDF, nor have the gear to do it... I may end up changing frequencies... Bit of a pain with 100+ subscribers to reprogram, plus repeater, probably just get a new duplexer... but at least I have a license for it already.
 

TampaTyron

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Joined
Feb 1, 2010
Messages
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Tampa, FL
You can take duplexer to a radio shop and have them retune it for you. Should not be more than an hour or so of labor. Certainly less expensive than buy and learning RDF. TT
 
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