Hi Darren,
I have a later KX3, number 5111, with similar options to you, built in ASTU
and KX3 hardware, but I don't have the battery charger or additional
heatsink options.
I built mine from the kit. It was very straight forward but I did buy an
anti-static mat first.
BTW - I made a mistake in labelling those pictures! The 1st is KX3 off and
the second KX3 on. I'll issue an ammendment just in case it causes
confusion later.
Good luck in tracking it down, I would be interested to see your screen
grabs showing the effects that you are seeing between on and off, so that I
can compare them to my own results. I'm downloading updated software for
the RF Explorer, which may improve the resolution of the pictures.
Cheers - Dave (G0DJA)
----- Original Message -----
From: "Darren Long" <darren.l...@mac.com>
To: <elecraft@mailman.qth.net>; <d...@g0dja.co.uk>
Sent: Friday, June 27, 2014 2:58 PM
Subject: Re: [Elecraft] KX3 - UHF emissions
Hi Dave,
Thanks for performing this comparison test. I admit that I found it
difficult
to perform repeatable measurements, as levels varied by as much as 10 to
15dB
due to position and orientation of the rig and cables and my position
with
respect to the equipment. That is why I chose to provide considered
representative figures derived from multiple observations as opposed to
precise
measurements or screen-shots, but I could provide screen-shots by way of
examples if anyone feels that would be really useful.
My KX3 is #01685, purchased complete (not kit) with the roofing filter and
ATU
options, from Waters & Stanton in the UK. I fitted the battery charger
when it
shipped, and have also recently fitted the SideKX end-plates and a VE7FMN
CoolerKX heatsink (although as noted before, the issue described pre-dates
these
retrofits).
Your results lead me to hope that my KX3 might be defective and that the
problem
could be resolved by repair or exchange. I suppose I should order a
KX3-PCKT
cable set to try in case the official I/Q cable mitigates this issue, but
I have
tried the 2.5mm to 3.5mm stereo cable that came with my Sennheiser
headphones
and that didn't seem any better.
I look forward to hearing confirmation from Elecraft of whether or not
these
emissions are considered typical for this build standard of KX3.
Cheers, 73
Darren, G0HWW
On 27/06/14 11:39, Dave wrote:
Here are two more screen grabs for KX3 on and off, but just looking at
the
frequency range 100MHz to 500MHz. Everything else is the same between
the test
done earlier.
KX3 on
https://dl.dropboxusercontent.com/u/65397105/KX3%20Test%2027-06-2014%201122.jpg
KX3 off
https://dl.dropboxusercontent.com/u/65397105/KX3%20Test%2027-06-2014%201123.jpg
I can't see any additional frequency peaks and moving the VFO on the KX3,
or
changing the band, doesn't appear to make any difference to the display
on the
analyser.
So, I can say that I'm not seeing seeing any distinct frequency spikes,
which
vary as I tune the KX3 VFO up and down, as Darren is seeing from his KX3.
Dave (G0DJA)
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