Thanks for the figures. I am trying to understand the amount of improvement we
can expect.
According to the ARRL Review in January 2009 the IMDDR was 106/103 dbm at 2 KHZ
but the Reciprocal Mixing was -86dbc at 2KHZ offset with 500 HZ bandwidth.
The new synthesizer has essential the SAME IMDDR 106 or 103 depending on the
filter bandwidth.
So, my question: is the real import of all this that the new synthesizer will
give the K3 an IMDDR which is NOT limited to 86 dbs by Reciprocal Mixing so we
will now get the FULL benefit of a IMDDR of 106/103?If so, that 20 db
improvement is huge.
I may be mixing apples and oranges, but I am just trying to understand this.
Thanks for any clarification the group can provide.
73,
Bob/AA6VB
From: Wayne Burdick <[email protected]>
To: Elecraft Reflector <[email protected]>
Cc: "[email protected]" <[email protected]>
Sent: Friday, February 13, 2015 3:34 PM
Subject: [Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)
Hi all,
I've updated the KSYN3A FAQ with the following information regarding testing of
a K3 with the new synthesizer performed by Rob Sherwood, NC0B.
* * *
Q: What is the approximate 2-kHz dynamic range (IMDDR3) of the K3 when using
the new synthesizer?
A: Our tests show in excess of 105 dB with the narrowest filters, though there
are many factors, and this should be considered approximate. (A very robust
test setup is required to make these measurements.) Rob Sherwood tested a K3
with a KSYN3A and obtained the following results:
2-kHz IMDDR3 with 200-Hz roofing and DSP filter = 106 dB
2-kHz IMDDR3 with 400-Hz roofing and DSP filter = 103 dB
Rob will be posting this information in his receiver performance chart
(http://www.sherweng.com/table.html) after he completes his full suite of tests.
* * *
The above numbers were used with Rob's permission.
73,
Wayne
N6KR
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