Phil,
I am using Field Day as a worst case scenario. I can't think of any
situation that is worse than have a collection of radios operating in
close proximity, to include their antennas. QRP operation does offer
the least challenges, but it still does have its problems. At the other
end, the serious QRO stations like W3LPL all take special precautions in
field layout and they use bandpass filters. However, I think you know
all that.
We don't have Frank's acreage to operate. We have to live within 2
acres for everything, but the KX3s do allow us to be less than
absolutely rigorous in our operation. We chose what we do because it
allows us to operate without the need to use bandpass filtering and the
need to model our site so that everything will work. I suspect strongly
we could operate at the 100 what level and still make no changes to our
site or operation except that we would need to be careful to have only
one transmitter on a band at a time, better band management.
One could argue the definition of the term intelligently crowed.
However, I was thinking that for a co-site operation no two transmitters
would be in the same portion of the same band. I may have a bit clumsy
with the my definition on this one.
Bottom line: my original point is that the KX3 does survive quite
nicely in what I would call an RF hostile environment. Will it wilt when
things get really crazy? Yes, it will along with every other radio.
73,
Barry
K3NDM
------ Original Message ------
From: "Phil Wheeler" <[email protected]>
To: "Elecraft Reflector" <[email protected]>
Sent: 12/12/2015 3:18:43 AM
Subject: Re: [Elecraft] Receivers?
Barry,
You said "Our Field Day operation uses all KX3s, QRP ... ". Well
that's a tad different than if you have some 500 W stations nearby
operating near your frequency. And that is more typical of the
situation I described. So rather than disagree you provided the
exception that proves the rule :-)
And "the KX3 can handle any intelligently crowded environment": Would
that all our bands were "intelligently crowded"!
73, Phil W7OX
On 12/11/15 3:49 PM, Barry LaZar wrote:
Phil,
I will take the given opportunity to disagree. Our Field Day
operation uses all KX3s, QRP, That accounts for 3AB + a GOTA station.
There have been times when we found one of our GOTA ops on the same
band and in the same portion of the band. What we have found is that
if the other radio is not in the same part of the band, you may not
even know he is there. However, you know he's there. If he is far
enough away, you could work through him. There is one caveat. We do
have our antennas really spread out. Our GOTA antenna(s) can be any
where from 200'-400' away depending on which of our many antennas are
being used at the time. And secondly, all of our radios are using the
8 KHz offset. I was amazed at the demonstration the first time it
happened. I would say that the KX3 can handle any intelligently crowed
environment.
73,
Barry
K3NDM
------ Original Message ------
From: "Phil Wheeler" <[email protected]>
To: [email protected]
Sent: 12/11/2015 6:23:11 PM
Subject: Re: [Elecraft] Receivers?
Scott,
I agree with all that Ron says -- and have the K2, K3 and KX3 .. and
like them all.
Re "I am considering the KX3": The one caveat I would add, and others
can expand on (or disagree with) this, is that if you operate in a
dense ham environment like Field Day or with other nearby hams
operating on the same bands the direct-conversion KX3 will not be as
good as the two superhets because you may have more difficulty
hearing weaker signals with those strong, nearby signals at adjacent
frequencies.
In Auckland this may or may not be an issue for you -- but as I
recall 70% or so of New Zealand's population is in the Auckland area.
73, Phil W7OX
On 12/11/15 1:40 PM, Ron D'Eau Claire wrote:
Scott, the three rigs use different design formats:
The K3 and K2 and conventional superhetrodyne formats with an
Intermediate
Frequency in the H.F. range and crystal filters to set the passband.
The K2
has an adjustable crystal filter and the K3 uses fixed crystal
filter
bandwidths. The basic K2 bandwidth is established by the crystal
filter
while the K3 adds an adjustable DSP filter after the crystal filter.
(The K2
has an optional audio DSP for enhanced filtering.)
Although you will often see Elecraft rig owners refer to "roofing
filters"
the Elecraft rigs avoid them, using an I.F. in the H.F. range
instead that
avoids a lot of the compromises involved in up-converting to a first
I.F. in
the VHF range with a VHF "roofing filter" to set the initial
selectivity.
The KX3 is quite different. It is a high-performance direct
conversion
receiver using phasing to suppress the unwanted sideband followed by
filtering of the resulting audio.
I'm a casual, mostly QRP operator who avoids pile-ups (and so
contests) and
enjoy all three. If I had to settle on one or the other I'd probably
take
the KX3 as my first choice because of its small size, the
"transparent"
sound of a direct conversion format and options such as the PX3
panadapter.
My second choice would be my trusty and ever dependable 15 year old
K2
simply because I'm basically an "analog" sort of guy. But I have no
complaints about the K3/K3S. I'm sure others who enjoy busting
"pileups"
will have more to offer about the advantages of the K3/K3S.
For detailed test comparisons check out the results published by
Sherwood
Engineering on their web site:
http://www.sherweng.com/table.html
-----Original Message-----
From: Elecraft [mailto:[email protected]] On Behalf
Of Scott
Gillen ZL1CHM
Sent: Friday, December 11, 2015 1:09 PM
To: [email protected]
Subject: [Elecraft] Receivers?
Can anyone compare the receivers in the KX3 versus K3 versus K2? Is
there a
significant difference? I am considering the KX3.
73
Scott
N0HOK / ZL1CHM
Auckland New Zealand
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