Problem is that (at least in SSB) I feel the K3 receiver (with the "old"
synth board) is never the limiting factor, it's always all those dirty
other signals (splatter, key-clicks, a.s.o. ... the new synth board will
*not* help anything if they splatter into your passband). I will not
upgrade for exactly that reason! In every contest I feel I already have
too good an RX and TX while other people gain advantages from their
dirty rigs ... :-(
73, Olli - DH8BQA
Contest, DX & radio projects: http://www.dh8bqa.de
Am 14.02.2015 um 01:44 schrieb Don Wilhelm:
Johnny,
Hopefully I can simplify it a bit given your example.
That S9+60dB signal will have a weaker response in your receiver *if*
your receiver was the limiting factor. If the transmitter phase noise
(splatter and other 'bad stuff' was the original problem, then you may
or may not have any improvement for that example.
In other words, you will notice an improvement if other signals on the
band are relatively clean. The improvement when other signals on the
band are not clean will not be as obvious.
Actually if an S9+60dB signal 10 kHz away is going to give you
problems, then that signal is coming from a 'dirty transmitter'. I
think a better example would be -- If you can operate within 2 kHz of
a strong signal with the current KSYN3, then the KSYN3A may be able to
allow you to operate within 1.5 to 1.8 kHz of that same signal. In
other words, you will be able to "saddle up closer" to any signal
unless the transmitter is creating trash.
Note: All numbers are for relative comparison only. I pulled those
numbers out of my head for illustration purposes only and do not
represent any test data. I have not seen nor used the KSYN3A.
73,
Don W3FPR
On 2/13/2015 7:19 PM, Johnny Siu wrote:
I must admit that understanding those figures are beyond my
knowledge. In practical terms, if I can now hear a below S1 cw weak
signal 10KHz away from a S9+60db station before upgrade, what will be
the improvement after the installation of KSYN3A assuming operating
under the same condition?
Such a demonstation was given to me when I visited Icom HQ in Osaka
last year in the announcement of the IC7850/IC7851. Again, IC7850 is
known foir extremely low phase noise.
Can any elecrafters interpret the improvements in an understandable
layman terms?
73
Johnny VR2XMCK-Line + KX3 + HR50
寄件人︰ Wayne Burdick <[email protected]>
收件人︰ Elecraft Reflector <[email protected]>
副本(CC)︰ "[email protected]" <[email protected]>
傳送日期︰ 2015年02月14日 (週六) 7:34 AM
主題︰ [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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