[Elecraft] Older option boards from K3 upgrade

[Vic Rosenthal]

The improvement in QSK performance and elimination of jitter in CW timing was immediately noticeable even without an a/b test. Night and day.

Vic 4X6GP 

> On 26 Apr 2017, at 0:06, Guy Olinger K2AV <k2av.guy at gmail.com> wrote:
> 
> Many times, with spectrum analyzer screen prints, etc. Some of those
> in the near-astounding category.
> 
> At this point can't refer you to them but you can find them with some searching.
> 
> A 3 dB improvement in TX strength will not be noticed either, until it
> is used in a situation where you're close to or in the noise.
> 
> Close neighbor hams with a sequence of installing the syns, and screen
> prints in the reduction in phase noise sidebands for each step, and
> noticeable improvement in interfering with one another. For me that
> was the killer demo.
> 
> The "news" aspect of the syns is pretty well past, so don't see much
> about it any more.
> 
> 73, Guy
> 
> 
> 
>> On Tue, Apr 25, 2017 at 4:33 PM, Wes Stewart <wes_n7ws at triconet.org> wrote:
>> I've seen these rave reviews about the new synthesizer many times.  Has
>> anyone actually done an A/B comparison in real time with two otherwise
>> identical radios.
>> 
>> I have a K3 with the original synthesizer (the actual one used to develop
>> the stiffener plate) and a K3S.  I have not run them side-by-side since I
>> don't have any test equipment with sufficiently low phase noise to use.
>> Anecdotally, using them one at a time in day-to-day operation, I haven't
>> noticed a difference.
>> 
>> Wes  N7WS
>> 
>> 
>>> On 4/25/2017 1:14 PM, Guy Olinger K2AV wrote:
>>> 
>>> I tossed my old synthesizers, in accordance with my dropping my old
>>> closet hoarder policy of keeping any and all for 40 years to see if it
>>> might be of any use. I actuarially doubt I will see another 40 years.
>>> 
>>> The synthesizer mod has met with such documented success, that I
>>> routinely advise someone looking for a used K3 not to bother unless
>>> the new synthesizer(s) are in it. Or to work a discount on any K3
>>> without them to offset the cost of the synthesizer(s) to be done
>>> immediately.
>>> 
>>> All this became apparent very early on after the new synthesizers were
>>> introduced.
>> 
>> 
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