[Elecraft] K3 P3 Spurious signals
Ian White
gm3sek at ifwtech.co.uk
Mon Feb 18 17:19:03 EST 2013
On 18/02/2013 20:57, Peter Lambert wrote:
> Hello Fred,
>
> I see a very similar thing on my IC-7700. Different frequency spacings but
> pretty much as you described.
>
> They're visible on the band scope but that's it. I can't detect any I'll
> effect from them. They're so far down to be of no consequence. I write
> them off as images in the DSP processing that produces the bandscope and
> appreciate that absolutely nothing is perfect.
>
> 73's Peter VK4JD
>
Fred, Peter: have you replaced the Elecraft supplied BNC-BNC cable?
I had very similar problems because the cable shield was improperly
crimped at both ends. A BNC cable from the junk box cured the problem
almost completely.
--
73 from Ian GM3SEK
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Fred Jensen
> Sent: Tuesday, 19 February 2013 6:42 AM
> To: Elecraft Reflector
> Subject: [Elecraft] K3 P3 Spurious signals
>
> K3 [#642] w/P3 in FixTune mode [cursor moves, ends of screen are fixed].
> K3 has the resistor mod to increase the 8 MHz IF output. I see them on
> CW, I haven't tried SSB.
>
> I've got a pair of weak, steady spurious signals ~14.5 KHz above and below
> the VFO A cursor. They tune with the VFO [i.e. I can never tune to them]
> With a noise floor around -135dBm, they run about -115 dBm. I see them only
> on 10m, however my noise floor is in the -120 to -115dBm range on other
> bands and they may be there and I just can't see them.
>
> With no antenna, the signals appear to be each bracketed by two very weak
> bands of noise about 2 KHz wide, about 3 KHz above and below each signal.
> They only show up on the waterfall [I use a monochrome WF].
>
> The K3 and P3 appear to be working just fine and I only notice them because
> when I tune VFO A, I end up with faint slanting traces on the WF. Anyone
> have an explanation?
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 2013 Cal QSO Party 5-6 Oct 2013
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