[Elecraft] K3 TX spurs?

[Willard Myers]

One possibility: “microphonics” modulating the synthesizer. The source is typically the sidetone being played through the internal speaker. A quick fix is to not use the internal speaker. The solid fix is the Elecraft synthesizer stiffener mod kit.

Easy to determine if this is the problem: change PITCH and see if the offset of the spurs changes.

I’ve seen this on a friend’s unit. The spurs were present, but diminished, with an external speaker. The mod kit stamped them out.

  Bill, K1GQ

On 2011.01.18, at 13:40, Rose wrote:

> I think I recall a thread about spurs being produced by 
> a K3's TX, but didn't pay enough attention at the time.
> 
> I've since become aware of a K3 that appeared to have 
> two spurs showing up on my P3.  They were about 30db 
> down from his very strong carrier on 7031 KHZ, and equally 
> spaced about 1 KHZ on either side. They both could be 
> "tuned in" and copied as individual signals.  I was surprised 
> when I asked the fella what his rig was and he told me it is a 
> K3. (;-)
> 
> I have -not- seen these spurs appear on other strong signals
> since this event, and follow-up tests with him have not shown
> the spurs ... but ... I've not seen his signal as strong as it was
> at the time.
> 
> There's no doubt they were "real", but what might be the
> cause?  Is / was the problem with his K3, my K3 or my P3.
> 
> Thoughts?
> 
> 73! 
> 
> Ken Kopp - K0PP
> ElecraftCovers at gmail.com 
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