Is anyone aware of any systems that transmit a 2850Hz pilot tone? I have a a 800Mhz Quantar in the Bronx that I was able catch interference coming in on the RX today, and it sounds like a continuous 2850Hz audible tone. It lasted for around 15 min then cleared itself. I have remote access to a computer that sits at the tower site that is loaded with RSS and connected to the serial port of the Quantar. Checking the RSSI indicated that a transmitter somewhere is continuosly keyed, so I'm fairly cofident it is an RF source. I also have a cable that connects the front handset jack audio of the Quantar to the line in of the computer's sound card, so I was able to record and download the interference audio.
Any ideas appreciated.
Thanks!!!!!
Zaputil
Interference in NYC
Moderator: Queue Moderator
Re: Interference in NYC
Grasping at straws here, but maybe there's still an old GE MARC-V system on the air?
I seem to recall they transmitted a ~3 kHz pilot tone on the repeater output; don't know if that was present on the input coming from the mobile as well.
--mws / kf4lhp
I seem to recall they transmitted a ~3 kHz pilot tone on the repeater output; don't know if that was present on the input coming from the mobile as well.
--mws / kf4lhp
Re: Interference in NYC
Isn't OpenSky being built out in NYC right now? Is it possible that you are receiving interference from the old Metro system being switched to OpenSky?
JAYMZ
"Mom and dad say I should make my life an example of the principles I believe in. But every time I do, they tell me to stop it."
Calvin
"Mom and dad say I should make my life an example of the principles I believe in. But every time I do, they tell me to stop it."
Calvin
Re: Interference in NYC
There wouldn't be a 2850hz tone...
Opensky's system has the same charactristic as cell data. You should be able to hear the PA Opensky from Beach Lake around the 866.x area. I believe there are 3-4 different channels running continously in Wayne County that you can pick up (from at least here).
BTW, check RR.com for thost NPS channels that I finally tracked down.
Opensky's system has the same charactristic as cell data. You should be able to hear the PA Opensky from Beach Lake around the 866.x area. I believe there are 3-4 different channels running continously in Wayne County that you can pick up (from at least here).
BTW, check RR.com for thost NPS channels that I finally tracked down.
Lowband radio. The original and non-complicated wide area interoperable communications system
Re: Interference in NYC
Fair enough. I hadn't heard the OpenSky signal before so I wouldn't have known... just a best guess. I ended up getting NPS frequencies from them directly. Works very well on the new scanner at work.
I'll give it a try when I get home later and see what I can hear. Unfortunately I am in enough of valley that I may not get it there.
I'll give it a try when I get home later and see what I can hear. Unfortunately I am in enough of valley that I may not get it there.
JAYMZ
"Mom and dad say I should make my life an example of the principles I believe in. But every time I do, they tell me to stop it."
Calvin
"Mom and dad say I should make my life an example of the principles I believe in. But every time I do, they tell me to stop it."
Calvin
Re: Interference in NYC
UPDATE:
The interference looks like it was comming from a mobile stuck on transmit. The tone was just a weird byproduct at that tower. Thanks for your comments!
The interference looks like it was comming from a mobile stuck on transmit. The tone was just a weird byproduct at that tower. Thanks for your comments!