[UK-CONTEST] K3

[Bob Henderson]

Don

I have no detailed knowledge of the K3 but a signal 15-18 kHz away from the
intended suggests leakage across the filter whose purpose is removal of the
DSP image.  However, I would not expect an unwanted signal +/- the preferred
frequency.  Rather I would expect to find it in one direction only.

The DSP image problem can be created in Orion through inappropriate choice
of roofing filter, though only on receive. Thank goodness.

My advice is to double check whether the unwanted signal is both + & - the
intended or offset in only one direction.  If it is only one direction you
might want to check what effect use of opposite side-band CW has.  If the
unwanted signals are both sides of the wanted, I would want to speak to
Elecraft before going much further.

Good luck.

Bob, 5B4AGN

2009/12/5 Don Beattie <g3ozf at btinternet.com>

> Re my posting of half an hour ago, please ignore.
>
> I have found the note on the Elecraft website that says they shipped some
> faulty boards, and - you're right - mine is one of them.
>
> It seems to simple fix and I'll do it this afternoon after some sleep, in
> time for night 2 of the ARRL contest.
>
> Sorry for the bandwidth.
>
> 73
>
> Don, G3BJ
>
>
>  ----- Original Message -----
>  From: Don Beattie
>  To: CDXC Reflector ; Uk-Contest at Contesting.Com
>  Sent: Saturday, December 05, 2009 8:35 AM
>  Subject: K3
>
>
>  Apologies for cross posting this to two reflectors, but I am seeking a bit
> of advice.
>
>  I pressed my K3 into use for the ARRL 160 contest overnight, and this
> morning, got a report of a bad spurious +/- 18 kHz from the wanted signal.
> I've checked, and it's there, about 30-40 dB down.
>
>  Has anyone experienced this, and is there a known fix ? I suspect
> imbalance somewhere in the first mixer/DSP.
>
>  Does anyone have any advice (other than to write to Elecraft !) By the
> way, as far as I can see, it is there on all bands.
>
>  73
>
>  Don, G3BJ
>
> _______________________________________________
> UK-Contest mailing list
> UK-Contest at contesting.com
> http://lists.contesting.com/mailman/listinfo/uk-contest
>