[Lowfer] An interesting signal on 1610 KHz A.M. last night

[Andy - KU4XR]

Greetings all: Coming home after mid-week church service last night ( 10/26/2011 ),  my wife wanted to
stop at the grocery store to get some ice cream, and caramel topping... While she and my son were in the
store, I turned on the radio in the Chevy Blazer, and set it to 1610 KHz... I got to listen for about 15 min.
The factory radio isn't anything to brag about for reception, but I was hearing the usual spanish station,
along with a second spanish station ocassionally, and I even heard an english station 1 time for about 
30 seconds or so... But, that wasn't the interesting signal... rising up, and fading out, I was hearing a very
raspy, and chirpy CW signal... It never stayed copyable long enough to get any really useful ID info on it.
I did manage to hear the letters J J many times, but there was more than that in the transmission...
I ruled out mixing products when I was able to hear it on the Kenwood at home too. Of course on the 
160 Windom, and the much more sensitive receiver; it was harder to detect it than on the car radio...
I finally found that the signal was 1700 Hz above 1610 KHz, so I engaged the DSP filter with a 200 Hz BW
from 1600 - 1800 Hz, and switched to USB... Now; I could actually tell that there was a CW signal in there.
Unfortunately, by the time I had all this figured out; the band changed, and the signal went away, and did not
come back over the space of about an hour... The speed was about 15 wpm, and I did clearly hear the J J
in USB at 200 Hz Audio BW... A nice little trick to heterodyne ( piggy back ) a weak signal on a strong one.
I mainly heard the signal when the spanish stations would rise up, and it was better during talking, or a 
dead space in programming... Curiousity of course will have me listening on the way home from work tonite
on my Pioneer radio which is a much better A.M. receiver than the GM radio is... May hear something; and
then again, may not...
 
73:  Andy - KU4XR