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Author Topic: TONE AT 28.440  (Read 362 times)
KB9ASC
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Posts: 12




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« on: August 01, 2006, 06:29:18 AM »

I OFTEN HEAR A STEADY TONE AT 28.440.DOES ANYONE KNOW WHAT IT IS??
HANK KB9ASC
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N3OX
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Posts: 8847


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« Reply #1 on: August 01, 2006, 06:36:15 AM »

At this point in the sunspot cycle, it's almost certain to be something very near to you.  

I remember that my Kenwood TS-440 has a tone on 28.400, a signal that's just generated inside the radio, sounded like it was in the digital electronics because it would change when I pressed a button.

There are all kinds of other sources of interference that could cause it too, computers and networking gear are good suspects for single tones.

Dan
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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
K8GU
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« Reply #2 on: August 01, 2006, 06:59:41 AM »

My money's on an internal heterodyne, too.  What kind of radio are you using?
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KC8VWM
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Posts: 3121




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« Reply #3 on: August 01, 2006, 07:15:17 AM »

Might be a signal generated by a computer in close proximity to your radio.
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KB9ASC
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« Reply #4 on: August 01, 2006, 08:15:19 AM »

I USE A 706 MK2G IN A MOBILE
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KB4QAA
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« Reply #5 on: August 01, 2006, 08:58:17 AM »

One other possibility to check out is out-of-band CB'ers.   Switch to AM and see if you hear anything intelligible.  I have heard several boaters/watermen working this freq. on the Chesapeake Bay.

73, bill
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N7UQA
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« Reply #6 on: August 01, 2006, 12:36:24 PM »

I USE A 706 MK2G IN A MOBILE


I have one of these to, but I don't have any birdies there. It's possible the signal could be coming from something in the car. The computer in my Saturn puts out a birdie on CB channel 26 (27.265MHz). But doesn't seem to be anywhere else.

Craig - N7UQA
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