[Elecraft] Pumping with K3

[wayne burdick]

Gary,

If your AGC is getting pumped by nearby stations even with the 250-Hz 
filter engaged, it's almost surely due to excessive transmit bandwidth 
on the part of those stations. Their keying sidebands may extend far 
beyond their carrier frequency. This is a common problem with rigs that 
have poorly-shaped keying and/or poor phase noise characteristics. If 
these stations are well over S9 and very close to your frequency, you 
may not have any really effective defense other than to ask them to 
reduce power, improve key shaping, or get a new rig.

The K3 is extremely clean in both regards, so chances are you're not 
bothering *them*  :)

You might try speeding up AGC-F (see associated menu entry) or even 
turning AGC off, backing down the RF GAIN, and possibly NR and DSP NB.

73,
Wayne
N6KR

On Jan 24, 2009, at 2:20 PM, Gary Smith wrote:

> I'm working the 160 contest and am wondering if there's some hint to
> help me overcome pumping from nearby stations. I am using the 8 pole
> 2.8K, 1K & 250Hz filters on CW. I'm mostly tuned down to 50Hz as
> that's what I need to do to find the DX that's being covered by the
> local stations calling CQ.

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