[Elecraft] Update to KSYN3A FAQ (some measured dynamic range numbers)

[Oliver Dröse]

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 <n6kr at elecraft.com>
>>   收件人︰ Elecraft Reflector <elecraft at mailman.qth.net>
>> 副本(CC)︰ "Elecraft_K3 at yahoogroups.com" <elecraft_k3 at yahoogroups.com>
>>   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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