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 Post subject: Re: What's on 49.8500 ?
PostPosted: Fri Dec 04, 2009 10:41 pm 
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Joined: Fri Nov 13, 2009 5:02 pm
Posts: 88
Has to be an in home monitoring device. Odd that it's sending out such a strong signal. I can hear a book on tape going and some one walking around and tv in the background. I heard an older woman and man talking earlier, so it must be a monitoring system of some kind. Crystal clear, the guy needs to put new batteries in his tape player. The audio slows down every so often....... :D Took me awhile to figure out it's a book on tape. Weird stuff going on in the book. LOL

It sure is putting out a heck of a signal! I'll have to take my hand held out tomorrow for a walk and see what I can find. It's not anyone I know, so has to be at least 1/2 mile away.


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 Post subject: Re: What's on 49.8500 ?
PostPosted: Sat Dec 05, 2009 12:41 am 
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Joined: Thu Oct 04, 2007 1:58 pm
Posts: 3430
Location: Not in Alaska
Line five sides of the inside of a box with foil, cut off the sixth, stick the radio inside with the attenuator on, and you've got yourself a cheap DF rig.


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 Post subject: Re: What's on 49.8500 ?
PostPosted: Fri Dec 18, 2009 10:31 am 
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Joined: Thu Apr 30, 2009 12:06 am
Posts: 344
My 6 meter rigs for the most part will tune that far out of band (on RX :wink:
and with a really good Yagi, you can hear those "100mW" (10,000uV/M measured at 3 meters :mrgreen: devices at considerable distances. Huge numbers of them... :party:

Took a pair of the HT's built for the 49 Mhz "garbage band", added full
quarter-wave antennae, and made a QSO from Southworth ferry terminal to a mobile similarly equipped on the ferry between Fountleroy
and Vashon, AND there was a "baby monitor" active on the frequency holding the squelch open on my HT, anyway!

I have been known to connect SWR analyzers to long-boom yagis, point them somewhere, and find that the "low power" signal from the SWR analyzer could be heard up to 30 miles away.

In order to determine if you are REALLY "in the middle of nowhere" one has to travel where there is no cell service, no PCS service, and NO signals between 49.830 to 49.890 :bowrofl:

_________________
That is how the people at DARPA think. they take things and use them in unconventional ways, to see what happens.


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 Post subject: Re: What's on 49.8500 ?
PostPosted: Sat Dec 19, 2009 1:39 am 
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Joined: Fri Nov 13, 2009 5:02 pm
Posts: 88
It's surprising how far the "low power" signals can travel. Way back when I had a Scantenna up about 100 ft. in a tree and it was amazing how far I could hear cordless phones. (2-3 miles) Of course I never listened to those freqs. only used them for test purposes!......:)

I still haven't narrowed down my signal. It's still full scale and I have it locked out as there isn't any thing worth listening too. Old people watching tv, coughing, sweeping, talking, farting.

Maybe this weekend I'll take the hand held out for a walk. I have an idea where it might be coming from. About 1/4-1/2 mile through the woods. I do have a 6 mtr yagi up against the wall outside, so I could throw that up and see what direction the signal is coming from. No, that would take too much effort. :)


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 Post subject: Re: What's on 49.8500 ?
PostPosted: Fri Apr 09, 2010 2:50 pm 
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Joined: Fri Apr 09, 2010 3:45 am
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Jim wrote:
I know that sounds weird but that is exactly what I used to help the local Coast Guard find a fishing boat with a stuck mic which was transmitting on 156.800. I had them drive around the water front and honk their horn while I listened. When they got to where I could hear the horn I went to that location and used a paperclip for an antenna. We finally found the right boat by tapping on the windows of a few boats where the sound was loud. :D


That's a great story!
Back in the 80's when I was a member of the USCG Aux as the communications officer for my flotilla, I turned on my VHF to start my radio watch when I started receiving a taxi service on on the maritime distress freq. 156.80. I guess this taxi service probably got a good deal on a batch of radios, put them in their cars, set up a base station and went on the air. As you may know the FCC requires all manufacturers of these radios to default to channel 16 when you turn them on, so unknowingly they were running their taxi service on the distress channel. I knew there were about 5-6 different taxi services in my area, and recognizing the street address that the cars were dispatched to narrowed my search. It took a few tries, but I would dial up the taxi service phone number while the base was transmitting and listened to the phone ringing over the radio in phase with the ringing on the phone. After verifying this a few times I called the FCC field office in NYC and spoke with the then head of enforcement, giving him the exact street address of the illegal station. The next day the FCC arrived and seized all of their equipment; antennas and all. It was likely one of the easiest "busts" they ever had! that too was in the local paper here. Ahhh fond memories!!


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 Post subject: Re: What's on 49.8500 ?
PostPosted: Fri Apr 09, 2010 3:08 pm 
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Angus Cheeseburger
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Joined: Thu Feb 19, 2004 5:09 pm
Posts: 4765
Location: CN88st
Very interesting story radiohead.

About 25 years ago in Bellingham, WA one of the local taxi companies bought some
sideband CB radios from a guy in town who sold radios and "tweaked" them.

He messed around with them and set them up to operate in the 24MHz area on SSB.
That way the other taxi drivers would not hear their dispatcher and beat them to a call. Too bad that we had an FCC monitoring facility at that time located only a few miles north east of Ferndale, WA in the same county. That operation didn't last very long. Needless to say the guy who sold and "tweaked" them got caught and heavily fined.

I think all the local taxies now use cell phones for dispatching.

_________________
" SILENCE IS CONSENT "

Made to Government Specs:
1) Measured with a micrometer.
2) Marked with a chalk.
3) Cut with an axe.

Jim N7UAP - Bellingham, WA / InterceptRadio.com


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 Post subject: Re: What's on 49.8500 ?
PostPosted: Wed Apr 14, 2010 11:01 pm 
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Joined: Fri Nov 13, 2009 5:02 pm
Posts: 88
Interesting posts. I remember way back when (70's) you could rewire and reverse the 455 khz crystal in the 23 channel CBs and either drop or raise the frequency. That was big for several years. Right about the peak of the sunspot cycle then, so there was world wide people on.

My 49.8500 signal is still going strong. I never did figure out where it's coming from. I have a good idea though.


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 Post subject: Re: What's on 49.8500 ?
PostPosted: Thu Apr 15, 2010 4:22 am 
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K7CAR wrote:
My 49.8500 signal is still going strong. I never did figure out where it's coming from. I have a good idea though.


Of course this is "theoretical", but, "theoretically" speaking, you may get a rise if you talk back to them...


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