| Author |
Message |
    
Road_warrior
Intermediate Member
Username: Road_warrior
Post Number: 297
Registered: 7-2004
| | Posted on Monday, February 14, 2005 - 6:27 pm: | 
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Hope this helps someone that recieves
awful noises in there radio./I use a 40 Ch
Walkie Talkie to track down noise sources in
my home & outside./ I found one of our
touchlamps made a buzzing noise in my radio./
Touchlamps do not have to be on to cause
buzzing./ I tracked down a terrible knocking
noise i started getting right after Christmas./
4 weeks of knocking was driving me crazy. I
found the noise source. My neighbor 3 houses
down had a garage in his yard. He was charging
a cordless drill battery & forgot about it./
We unplugged his charger & it quit./
Hopefully these tips will help someone...
JIM/CENTRAL PA/ CEF 375 |
Tech808
Moderator
Username: Tech808
Post Number: 4853
Registered: 8-2002
| | Posted on Monday, February 14, 2005 - 6:36 pm: |
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Yep,
They Work GREAT for finding problem areas and interference sources. 
Lon
Tech808
CEF808
N9OSN |
Supertech1
Junior Member
Username: Supertech1
Post Number: 21
Registered: 1-2005
| | Posted on Monday, February 14, 2005 - 9:47 pm: |
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I used my mfj-259b freq. counter to locate a bug that was planted in my house by a neihbor kid |
Gijoe
Member
Username: Gijoe
Post Number: 70
Registered: 4-2002
| | Posted on Monday, February 14, 2005 - 10:31 pm: |
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Supertech1,
What do you use for an antenna, if any at all, for the freq. counter on your 259.
Thanks,
Joe |
Supertech1
Junior Member
Username: Supertech1
Post Number: 26
Registered: 1-2005
| | Posted on Tuesday, February 15, 2005 - 12:15 am: |
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I used a vhf 'rubber duck' ant. off of a scanner. you can even put a broadband pre-amp on it for better sensitivity. without a preamp, i started detecting the bug when i was within 10 feet of it. freq. lock-on about 5 feet from it. just plug the ant. into the bnc con. that is label freq. counter. input. |
Corey8989
New member
Username: Corey8989
Post Number: 1
Registered: 2-2005
| | Posted on Tuesday, February 15, 2005 - 4:14 pm: |
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I'm having a problem with my mobil unit (cobra 18 with the weather band with a lil wil ant)that is installed in my vechile. When I start my car there is a alternator hum that I cant get rid of. I have installed a noise filter and that didn't any. I have even run my wires stright to my battery and that didn't help either. So any help would be greatfull. |
Usa2112
Junior Member
Username: Usa2112
Post Number: 13
Registered: 2-2005
| | Posted on Tuesday, February 15, 2005 - 5:50 pm: |
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I hope your neighbor is now in the FED resort for quite a long time.Being an x-private investigator I am aware of the insanity it can take to get permision to do taps and bugs and the very heavy prison time for failing to do it the right way.Not to mention what a grand civil case you would have. |
Racer X (Unregistered Guest)
Unregistered guest
| | Posted on Tuesday, February 15, 2005 - 8:16 pm: |
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Depending on the bandwidth of the noise, you can use a transistor AM radio tuned to a frequency without a station. Turn up the sound really high and move around with it. You can even use the directional nature of the loopstick antenna they have to find the direction of the noise source.
AM is great in that you can hear all modulation types with an AM reciever. You won't get a clear signal on anything other than AM, but you'll certainly hear them as noise.
I also own what's called an FM interceptor. It'll lock onto the stongest nearby FM transmission between 30 MHz and 1 GHz. I use it mostly for listening to local emergency services when I'm at the scene, but it can also be used to sweep a room for bugs. I've never used it to run down noise for HF, but it works great for anything above HF. |
Tech237
Moderator
Username: Tech237
Post Number: 137
Registered: 4-2004
| | Posted on Tuesday, February 15, 2005 - 8:57 pm: |
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Touch Lamps cause noise, even when off, because they always have an oscillator running whenever they are plugged in. It is you interaction with this oscillator that causes the lamp to turn, change light levels and of course turn off.
The other problem with Touch Lamps is that they can make a great modulation monitor (ask my ex-wife). The one in our bedroom flashed whenever I operated on 40m. |
Legend
Member
Username: Legend
Post Number: 79
Registered: 12-2002
| | Posted on Sunday, February 20, 2005 - 6:58 am: |
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Supertech1, what was the frequency that the bug was operating on? |
