[Elecraft] K3 & ADAT ADT-200A by HB9CBU

[Bill W5WVO]

I have to agree with the reasoning behind John's comments here. As
has been opined by many, the K3 really shines its brightest on CW,
where spurious transmitter products are typically limited to the
occasional key clicks. The percentage of misadjusted and badly
offending transmitters is MUCH greater on SSB; I don't think
anybody would argue with that.

That said, it's all a matter of arithmetic, and there are a lot of
variables involved -- on both the TX and the RX ends. But all
other factors being equal, how much is it worth to have the needed
receiver dynamic range for that one must-have SSB contest or DX
QSO that you wouldn't get without it? Many would say (no trademark
infringement intended), "Priceless!"

For most of us, that isn't literally true, of course. You do reach
a point of diminishing returns with anything, especially in
engineering. The K3, IMO, strikes what is just about a perfect
balance between high-end performance and price. No other radio
even comes close to the K3's price/performance ratio, as far as I
can tell.

Bill W5WVO


----- Original Message ----- 
From: "John A. McCabe" <johnamccabe at verizon.net>
To: "elecraft" <elecraft at mailman.qth.net>
Sent: Tuesday, December 02, 2008 6:11 PM
Subject: Re: [Elecraft] K3 & ADAT ADT-200A by HB9CBU


>
>
> David Cutter wrote:
> > Some folk suffer extremely strong QRM from broadcasters on 40m
> > (particularly on the east coast of Scotland) and to them there
is a
> > real desire for the best possible gear to hear weak stations
amongst
> > huge bc signals from Europe.  That's where receivers like the
Perseus
> > and others come in to their own.
> >
> >
>
> Hi David,
>
> Yes I can see your point, and I am certainly not questioning the
benefit
> of High Dynamic range receivers in those situations. I guess
what I am
> having a hard time understanding how it would be possible for
any
> receiver, regardless of the dynamic range of the receiver, to
receive a
> weak signal 2 Khz away from, say a 80db over 9 broadcast or
other
> signal. Would not the IMD, sidebands, and splatter from the
broadcast
> station itself be so severe as to prevent this? Or am I
overstating the
> effects of transmitted phase noise and IMD? As I mentioned in my
> previous post, there is no way I could see operating 2 Khz away
from the
> very strong signal of my  ham neighbor. His transmitted IMD
would be way
> too severe. But  I can easily operate 20 Khz  or more away with
the K3.
> To me, any minor difference in close in dynamic range between
say the
> Perseus and the K3 is of little or no importance in this
situation. I
> could not receive a weak signal so close to such a strong signal
anyhow
> because of his transmitted IMD. But the wider spaced number's
matter a
> great deal, and that is what concerns me when I see a 117-123db
BDR as
> compared to 140db at wider spacings.
>
> 73,
>
> John, KD8K
>
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