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Author Topic: How close is too close?  (Read 389 times)
AE6RF
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Posts: 151


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« on: May 13, 2006, 08:28:48 AM »

How close to an existing CW QSO, or specified calling frequency can you get while still being courteous?

Sure, with a tight filter and a good op you can get within a couple hundred Hz, but that assumes "the other guy" has the same.

What is considered "too close" for normal operation?

(And yes, given an unoccupied band, there is no need to "get close.")

Thanks and 73,

-Donald
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NI0C
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Posts: 2391




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« Reply #1 on: May 13, 2006, 04:01:35 PM »

This is an interesting question. The answer depends a lot on conditions at the time and relative signal strengths.  I'm fortunate to have a receiver with a 600 Hz CW roofing filter, followed by cascaded 250 Hz filters, and two stages of audio DSP.  Unless your signal is at least 20 dB over s-9, you could call CQ 150-200 Hz from my frequency and I wouldn't know you were there.

Still, I wouldn't plop myself that close to another strong signal (unless it's contest time).  I'd allow 300 Hz or more, if possible, which is a little more than a half-bandwidth of the typical 500 Hz filter.  

73,
Chuck  NI0C  
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AA4PB
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« Reply #2 on: May 14, 2006, 03:26:31 PM »

Interesting question. Some guys are using a 3KHz wide SSB filter for their CW and so will consider that you are QRMing them if you are within 3KHz of their signal. You run into this quite a bit with various data modes. Many times you just can't give everyone that much space unless you stay off the air. In a crowded band I figure if I am using a reasonable filter for the mode (say 500Hz for CW) and I can't hear the other station then I should be far enough away.
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KX8N
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« Reply #3 on: July 21, 2006, 06:43:50 PM »

It actually just depends... I mean, when you've got two QSO's close together, you are talking about 4 hams with most likely 4 different transceivers and who knows what filters they each have. If any one of them has a wide filter, you may QRM him.
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