Eric, et al,
A couple of years ago at the Salina, Kansas hamfest, Dwight (N3ARU) and I did a
similar test without all the antenna modeling, signal generator testing and
with much closer antenna spacing using a pair of home made PAC-12 verticals on
20 meters. The verticals were just over 40 feet apart and the only isolation
consideration was that one antenna was sited barely around the corner of a
concrete and steel building from the other one. The rigs were our two K3's
with Dwight running 100 watts of SSB on 20 and I was running 100 watts of CW
and sometimes 100 watts of RTTY, demonstrating the two rigs and the
non-interference capability. I did have the 400 Hz 8 pole filter switched in
on the CW station and Dwight was using the stock 5 pole SSB filter. To add to
the mix, we also had David, KD0R running his K2 at some power between 5 and 10
watts (I don't remember exactly now) on CW somewhere in the 20 meter band as
well. David's antenna was a wire dipole taped to the wall of the bu
ilding about 10 feet or so behind the table on which all three rigs were
operating.
The K2 got a little interference from both of the K3's but would still have
been usable in a real-world situation and neither K3 had any interference from
each other or from the K2 which speaks very well for the almost lack of phase
noise in the K2 as well. I had a P3 connected to my K3 and I could tell when
both Dwight and David were transmitting by watching the P3's baseline, but no
artifacts or blocking was detectable by ear (granted it was a fairly noisy
environment) in either K3. I don't remember now what frequency separation was
necessary between either K3 and the K2 to eliminate interference to the K2, but
it wasn't a tremendous amount and it was able to co-exist with the K3's on the
20 meter band during the hamfest.
Not sure how many sales we generated for Elecraft that day, but there were a
large number of people that were shaking their heads in almost disbelief that
the reports they had heard previously of this capability of the K3 weren't just
"smoke and mirrors". Quite a few of them came back several times to discuss
the rigs and all left with the literature handouts.
Jim Sheldon - W0EB
> Nice real world interference test of IMD/Blocking and phase noise
> between 2 K3s operating in the same band versus other rigs for
> Field Day
> and contesting use.
>
> http://www.w0qe.com/Technical_Topics/phase_noise_and_overload_testing.
> html
>
> 73,
> Eric
> ---
> www.elecraft.com
>
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