I have been scanning the list my coordinator gave me for an IG FCC application. I have been using ProScan and the Search Frequencies here on Radio Reference. ProScan with my scanner enables me to monitor the frequencies and also record the audio. I am stumped because on a frequency that a search shows no license in neighboring cities I am getting runs of a 5 second burst of audio spaced 1 second apart thru out the day. It seems automated and might be digital. Anybody know what it could be? Other than that the freq is clear.
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Scanning for clear frequencies from coordinator.
- Thread starter RDTS
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First off, would you mind sharing the frequency in question? That would help with identifying it. Second, you posted this in the Federal Monitoring section of the forums - is this a frequency in the federal spectrum (138-144, 144-150.75, 162-174 or 400-420 MHz)?
- Chris
- Chris
Is it possible it's telemetry?
I've spent quite a bit of time reading 47CFR 90.35
eCFR — Code of Federal Regulations
One example is limitation 30 which is on a ton of frequencies:
This frequency will be assigned with an authorized bandwidth not to exceed 11.25 kHz. In the 450-470 MHz band, secondary telemetry operations pursuant to §90.238(e) will be authorized on this frequency.
I've spent quite a bit of time reading 47CFR 90.35
eCFR — Code of Federal Regulations
One example is limitation 30 which is on a ton of frequencies:
This frequency will be assigned with an authorized bandwidth not to exceed 11.25 kHz. In the 450-470 MHz band, secondary telemetry operations pursuant to §90.238(e) will be authorized on this frequency.
It's in the IG business frequencies. I posted here because I could find no other section that came close. Finishing up our FCC business lic. It's in the 150 range. I can give you the freq if you still feel it would help. If this isnt the spot to post could you steer me in the right direction.
Your state forum might be better place to start. people in your area might be better familiar with freqs in your area.
Thanks I'll give that a try. Primarily I just wanted to know if anybody might know what 4 second burst at 1 second intervals might be. In a 30 day period I logged 2 hours of it.I am the only lic holder on that freq in 2 cities. Probably data or digital though. Thanks again!
ecps92
Member
Plenty of expired licenses are still in use.
You could also be hearing [depending on the radio you use] Adjacent channels.
Knowing a.) Where you are and b.) The Freq's can help us formulate a better response
You could also be hearing [depending on the radio you use] Adjacent channels.
Knowing a.) Where you are and b.) The Freq's can help us formulate a better response
Thread moved to Industry Discussion.
mkewman
Member
I suspect that the frequency may be part of a distant LTR system or trunked system using telemetry. Your best bet is to see what RSSI level you're getting on the transmissions. If it's a very low power transmission, you'll be fine with it.
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