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Author Topic: Carrier on 14.316  (Read 9766 times)
KF5WFL
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Posts: 1




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« on: August 16, 2013, 10:11:37 AM »

I'm just getting back into ham radio, so I have a lot to learn anew. One thing I found is a carrier on 14.316 that's there 24/7. Can anyone tell me what it is?
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K5LXP
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« Reply #1 on: August 16, 2013, 12:04:28 PM »

Probably something in your house.  The band isn't open 24/7 so it's something nearby.

Mark K5LXP
Albuquerque, NM
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W8CZ
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Posts: 12




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« Reply #2 on: August 16, 2013, 03:53:25 PM »

The NTSC colorburst frequency is 3.579545 MHz. The 4th harmonic is 14.31818 MHz.

I can pick-up both virtually 24/7 from TV receivers in the area. Perhaps this is the source?

73,
Rick
W8CZ
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W5ZZT
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Posts: 70




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« Reply #3 on: November 30, 2013, 10:01:12 PM »

That carrier has been there for as long as I can remember.  Years ago I use to check into the Icom net that was on 14.317.  The carrier on 316 always was a problem for me.  Never could figure out where it was coming from.
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W2MV
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Posts: 207




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« Reply #4 on: January 02, 2014, 11:43:36 AM »

Interesting. I had a carrier on 14.310 and it turned out to be a cordless phone "base."
Now if anyone can tell me what the multiple, very close in freq carriers are at around 14.029 MHz that would be great.
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SWMAN
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Posts: 557




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« Reply #5 on: January 02, 2014, 12:20:45 PM »

Maybe its the clowns on 14.313 playing around again !!!
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HURRICAINE
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« Reply #6 on: January 02, 2014, 03:56:39 PM »

The NTSC colorburst frequency is 3.579545 MHz. The 4th harmonic is 14.31818 MHz.

I can pick-up both virtually 24/7 from TV receivers in the area. Perhaps this is the source?

73,
Rick
W8CZ

Wow Rick!
You really impressed me with that one..
Good answer.
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K1DA
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Posts: 480




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« Reply #7 on: January 31, 2014, 09:25:01 AM »

Does the new HDTV standard still is the same colorburst?  Digital, now, is it not?
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KF7CG
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Posts: 826




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« Reply #8 on: January 31, 2014, 12:55:02 PM »

If any one in your area has an embedded control computer of older PC style and vintage, the master clock in all those PC and there clones was 14.31818 MHz devide this by 3 and you get the old 4.77 mhz clock that they ran. A cheap stunt to allow on master clock to generate the 1 on, two off clock used by the cpu and to produce the color burst frequency used by the old color video cards. DIgital oscillator so dirty as H@@@.

Color burst oscillotors tend to generate signals on 3.5780 and 7.160 as well where PCs often do not. They just polute on 4.77, 14.318 and multiples thereof.

The amount of emissions allowed for home computing devices was significantly increased to allow the PC to be marketed with a display for home use.

David
KF&CG
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WX7G
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« Reply #9 on: February 09, 2014, 04:51:59 AM »

Radiated emissions testing below 30 MHz is not a requirement for unintentional radiators (such as a PC).
« Last Edit: February 09, 2014, 04:55:04 AM by WX7G » Logged
KF7CG
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Posts: 826




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« Reply #10 on: February 10, 2014, 11:11:41 AM »

I believe there was a standard for overall emissions for "home" as opposed to "computing/business" class computing devices in the early 80's. The time when all the Apple units came with the traces for but no parts installed for video modulators, allowing them to bypass the stricter "home" Class B computing device requirements. Atari's went with the modulator so all their peripherals were run through a sheilded serial bus.

David
KF7CG
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