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: [email protected]
[mailto:[email protected]] 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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