A simple question :
the new synthesizer uses a DDS? If yes what is the type?
73
Giuliano I0CG
Italy
K1,K2,K3+P3
Message: 18
Date: Tue, 10 Mar 2015 15:54:24 -0000
From: "Dave Olean"<k1...@metrocast.net>
To: "Elecraft Reflector"<elecraft@mailman.qth.net>
Subject: [Elecraft] A datapoint comparing old vs new synthesizer
boards.
Message-ID: <3AE5C8AA7D6B4DF2A2932520B75DCF21@t30ce0d73e1b34>
Content-Type: text/plain; charset="iso-8859-1"
I recently got a new K3 and it was one of the first units supplied with the new
and improved synthesizer board. In reading a few comments on the reflector, a
number of people wanted to know if anyone could detect any difference between
the old and the new. I also have some older K3s and decided to compare one of
them head to head with the new one on ten meter CW using a 500 Hz bandwidth and
check for MDS. I used the line out jack and an HP AC VTVM and 8640B signal
generator. Here is what I found:
K3 #8858 no preamp -137 dBm new synthesizer board
preamp ON -139 dBm new synthesizer board
K3 #1504 no preamp -134.5 dBm old synthesizer board
preamp ON -137 dBm old synthesizer board
I also ordered a pair of synth boards for one of my old K3s on March 1, but it
will be awhile before it gets here I guess. I ordered a P3 kit with it and
included comments that I was in no rush for the P3 so ship it all together.
From the comments I have seen on how many have been ordered, I might be waiting
a long time for the P3!! At my age, I'll probably forget about the order in
another week or so. When it shows up, I'll wonder what it is and who ordered
it!! The plan is to put new synth boards into #1504 and then I can check MDS
again to see how it looks. From my checking, it looks like the newer K3 is
almost 3 dB better than the older one at least as far as minimum discernable
signals go. The new board definitely makes a difference, and my result tracks
reasonably well with what what others have found.
Dave K1WHS
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