[Elecraft] K3 synthesizer problem

[Fred Jensen]

On 2/9/2012 4:07 PM, Tom Kramer wrote:

> I have exchanged a number of emails with Gary Surrency about
> this with basically no conclusion and an apparent lack of desire to
> solve it.

That would be a first for this group.
>
> I discovered that when attempting to transmit between 24,910.0 and
> 24,930.0 the swr bar graph shows a pulsating full scale reading and
> the dial reads SWR between 9:1 and 12:1, and power output of maybe 20
> watts.

Do you have the K3 ATU?

If you're getting 20W with that SWR, you must have the 100W PA, true?

With an antenna connected, what do you hear on RX as you tune into one 
of these regions?

Why do you think it's a synthesizer problem?

Do you have any method [another receiver] to check the freq of your TX 
signal as you cross into one of the high SWR regions?

If it happened across an entire band, I'd suspect you maybe 
inadvertently selected ANT2 on that band and "elephant-brain" K3 
remembered it.  I'd suspect that because that's what I did, and got a 
phone call from Wayne -- first thing he asked me to check.

If you have the ATU and it is in AUTO, it may have "remembered" a 
setting for that band segment that is wildly wrong.

Others will no doubt speak up here.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org