Weird open min on GMRS/GRS channels

[AronDouglas]

Sorry, mis-type title. "Weird open MIC"

I don't know when it started, but at 2100 hours eastern standard time (when I turned on my scanner), I started hearing long transmissions of static lasting 2-3 minutes. I heard it on FRS channel 9 first and thought I picked up some goofball holding the mic key down. But then it stopped for a few seconds and my scanner went back to scanning. Then it stopped on FRS channel 10 and began again. The transmissions are progressing upward through the 400mhz along the GMRS and FRS range.

It sounded to me like just static, but I haven't been listening to scanners long so I wont say too much. I live in south east Georgia. As I post this at 2112, it is on 467.7250mhz.

 

[AronDouglas]

Ok, longest transmission is on 467.7250. Maybe someone has a stuck open mic on a repeater? BTW, as of 2123 its still transmitting.

 

[robertmac]

Can happen anytime anywhere when radios are involved.

 

[VE1GAT]

I've confirmed some sources for GMRS/FRS signals.
check for a 900 Mhz wireless internet within 10meters of RX'r (and for any business end pointed your way of any yagi associated with one)
Another source is (this is weird) car radios with MP3 CD players in them may TX on specific GMRS FRS frequencies, and I mean specific +2.5khzI've tried several antennas on the RX'r with the same result

 

[Darth_vader]

They don't actually "transmit" on those frequencies, they simply emit spurious radio signals. Remember, CD players, especially those with MPn support, are actually dedicated computers and have lots of RF-generating equipment within. I have a Panasonic SL-SX480 pocket MP2/3/Red Book CD player that emits strong white noise on FRS 4, 6, 9, 11, 14, GMRS 15/550, 17/600 and various other 400 MHz frequencies. If I move my radio away from it about 2 1/2-3 feet it goes away. Seems to me that this kind of falls on "part-15" turf.

Hence the traditional boillerplate:

"Operation of this device is subject to the following two conditions:
1) This device may not generate harmful interference
2) This device must accept any interference received, including that which may cause undesired operation." (Emphasis added.)

 

[VE1GAT]

so true, but to TX on exactly on one FRS GMRS frequency not 2.5khz above or below and not splattering is some weird harmonic coincidence. I wonder if in that case it might localized control signals sent to an optional remote unit (say in the trunk).