RCtime
So. Calif.
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I was tooling along today co-mingled with some truckers and started to receive audio on ch. 19 with my CB off. I turned it on and it was there but broken. When off Very, Very faint but not broken. really weird.
We eventually split up and it was gone, but for a few minutes I had ch.19 audio and I even think it might have been coming out of my surround sound speakers, not sure , I couldnt do much at freeway speeds. Weirdest thing I ever heard.
Ron
2002 34HD Winnebago Journey DL, Cat. 330/freightliner
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dons2346
Sioux Falls, SD, formerly of So. CA
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It is totally possible. If the truckers were running a high wattage amplifier (which is illegal), it is possible to overload the front end of your CB even with the power off. It acts kinda like a crystal radio set.
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Sailbad
Bernardo, New Mexico or Quartzsite
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Yep! someone around you was running a foot warmer.
Dave C.
2005 Silverado 2500 CC
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camperpaul
Wherever I park my travel trailer
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dons2346 wrote:It is totally possible. If the truckers were running a high wattage amplifier (which is illegal), it is possible to overload the front end of your CB even with the power off. It acts kinda like a crystal radio set.
Even with legal (4W out) power, I have seen this happen.
Paul
Ham Radio - K9ERG (since 1956)
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SCVJeff
Santa Clarita, CA.
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camperpaul wrote:dons2346 wrote:It is totally possible. If the truckers were running a high wattage amplifier (which is illegal), it is possible to overload the front end of your CB even with the power off. It acts kinda like a crystal radio set.
Even with legal (4W out) power, I have seen this happen. Ditto
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350
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Rvpapa
Alberta , Can.
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Joined: 08/07/2002
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Used to service gensets, working on standby power at a standard radio broadcast site you could listen to the program on a wrench. In fact the whole toolbox was like a real cheap radio.
ART.
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dons2346
Sioux Falls, SD, formerly of So. CA
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camperpaul wrote:dons2346 wrote:It is totally possible. If the truckers were running a high wattage amplifier (which is illegal), it is possible to overload the front end of your CB even with the power off. It acts kinda like a crystal radio set.
Even with legal (4W out) power, I have seen this happen.
I think this is due to a cheap receiving CB. The signal rejection isn't that good and it is processing a harmonic of another channel.
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jay2003
San Joaquin Valley, California
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I've worked with audio gear from many different manufactures. You will know the "cheap" stuff because from time to time you can hear CB'ers in the speakers due to the fact the speakers aren't properly shielded from RF noise. The high power illegal amplifiers can actually cause unshielded speaker coils to modulate. It's basicaly the same effect that happens when a cell phone is near a cheap speaker and you hear the "chirp chirp" from the cell phone only you hear voices instead.
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Caddywhompus
Southeast WI
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When I was a teen, I used to sit in my parent's driveway and jabber on my CB with friends (back then everyone had them). If I used certain channels, my parents could hear my transmissions on their TV. I never knew, but later my mother told me that her and dad used to sit and listen to all the dirt I thought was private, and use it to bust me later! My radio was nothing hot or fancy. It had no amplifier, and was stock. I wanna say Cobra 30+ or something? It was just that the cable ran up the side of the house right near the driveway and close enough to the CB antenna (I did have a 108" whip!) to overcome the shielding on the coax.
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SCVJeff
Santa Clarita, CA.
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Probably something like a Cobra 132?
The 1st time I saw this was as a little kid at Sears with my genius neighbor that built an Eico CB Kit. There was a parking guy in a tower telling people where the open spots were over the parking lot PA. We stopped under the speaker cable spanning the lot at least 12' in the air, and he keyed up and gave a quick test in the mic. Loud and clear in the lot! And this was a completely stock radio.
Driving up on Mt. Wilson above Los Angeles, there is enough RF in the air to not only hear the local FM in the area (vehicle off), but many radios lose their entire memory if parked there too long.
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