Iowa City - Anyone else getting a lot of GMRS traffic without audio?

sempai

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Iowa City, IA
i'm logging a lot of 2-10sec transmissions on GMRS that don't have any audio that i can discern. my SDS100 is chirping all day long about it, and i haven't gone on a dive through the recordings yet but on .72500 with C 114.8 today i've had over 250 hits since this morning. the alert goes off on my scanner, ProScan is hitched up to it, so i've got an iPad Pro riding shotgun giving me a log tail via RDP.

RSSI is usually ~-80 on these. it's interfering with my ability to monitor an NXDN system so i've had to disable my FRS/GMRS list for now. i just don't know if i have an equipment problem or what.

the 1080 upstairs has priority assigned to GMRS i'm hearing a lot more AM CB than usual too, but i can hear those transmissions. the GMRS ones are apparently silent.
my GMRS system uses some of the same frequencies but not that squelch code, but between the scanners and my kitchen radio it's starting to weird me out.
 

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VFN05

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Dec 19, 2002
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Norfolk, VA
I’ve seen home intercom systems that use GMRS/FRS freqs. Any chance part of your system is beaconing? It sounds like you have a pretty
strong signal based on the rssi.
 

sempai

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Iowa City, IA
interesting observation! i do have several GMRS-Pro HTs and they do position beaconing but it is a very short burst and wouldn't account for a signal with no audible, they actually make a little chirp when they do it much to my annoyance.

over the weekend I had something super weird going on with FRS/GMRS that may be the same thing. i have spliced to video clips together one of a pro97 (fast as hell at scanning cb/gmrs) and a GMRS-Pro picking it up as noise and a pop at the same cadence. i put a nooelec smart on another workstation down there so when it's happening i can grab a waterfall.

video: Dropbox
 

sempai

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Iowa City, IA
also i swear i heard what sounded like an after-school parking lot somewhere last friday, and there's only a couple of schools within range of my HTs and they're on the ICCSD NXDN system so maybe it was a parent or something.

i have 3-4 calls like it in ProScan's log during the 2:55p pickup window fri feb 14, and if anyone else spots it, the ones i captured were using D452 DCS.
i have too many projects and mysteries going on right now - i am trying to figure out how i configured my Randy II FCC wrong enough that i'm inaudible and i want to get that fastlane subscription for DSDPlus to really camp the hell out of that NXDN system ICCSD uses, but i'm making myself wait until i have some other things done before getting squirreled on that all over again 😂
 
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