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Author Topic: Zero beat another CW station  (Read 2012 times)
KD7TCV
Member

Posts: 17




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« on: November 09, 2003, 05:44:24 PM »

I just don't understand how to do this. Can someone explain it in a simple manner.
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N8UZE
Member

Posts: 1524




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« Reply #1 on: November 09, 2003, 06:40:10 PM »

You are trying to match the pitch of the incoming CW station to the pitch of the CW sidetone on your radio.

1. Set your radio in CW mode.
2. Find an incoming CW station.
3. Turn the tuning knob until the incoming signal gives you a max reading on your S-meter.
4. Make sure that your radio is set to NOT transmit on keydown.
5. Hold down your CW key and while holding it, turn the tuning knob until the pitch of the two are exactly the same.
6. Let go of the key, set your radio to transmit, and answer them.

The reason that it is called "zero beating" is that when the two pitches are different, you get a pulsing "beat" but when you have them exactly the same there is no pulsing sound.  When there is no pulsing, it is "zero beat."

If your radio has CW filtering available, put in the filter after step 3 and again tune until you get the max S-meter deflection and then continue with step 4.  If you have very narrow filtering available, it may be sufficient just to turn the filter on and go for the max signal and you can often skip the steps after number 4.
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KF5YU
Member

Posts: 18




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« Reply #2 on: December 04, 2003, 12:53:18 PM »

Check this website for a neat looking zerobeat indicator. I've haven't tried it yet but heard great things about it. http://home.att.net/~jacksonharbor/ham.htm
Glad to see some interest in zero beating, very few on the air apparently don't know how!
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AC3P
Member

Posts: 20




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« Reply #3 on: December 24, 2003, 06:13:55 PM »

Back in the days before transceivers we would zero beat by tuning the receiver on the incoming cw signal until the audio frequency was zero. Then we would tune the vfo on the transmitter until its audio frequency in the receiver was zero. Then you knew you were on the other fellow's frequency. Then we would set the beat frequency oscillator on the receiver so that we could hear the other fellow's signal.

This technique was also used to coordinate the transmit and receive frequencies before calling CQ.

That was before sidetones and digital readouts.

Took me a while to get the hang of aligning the sidetone and receive frequencies as is now the practice.

   
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KJ4AWF
Member

Posts: 1




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« Reply #4 on: February 05, 2008, 09:22:34 AM »

how does this work when using something like a two tinned tuna and separate receiver?

thanks,
K4TTR ex KJ4AWF
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