[Elecraft] QST Review of KSYN3A synth has erroneous TX phase noise plot

[Joe Subich, W4TV]

On 10/20/2015 4:48 PM, Walter Underwood wrote:
 >
> One line for the FCC requirement, then a broad line showing the
> curvesof the three best rigs tested so far.

Unfortunately, there is no FCC requirement for transmitted phase
noise.  Showing the "best three" on the graph is a good idea but
the graphs are generally hard to read.  I would like to see the
data presented in tabular form with values at 5 KHz, 10 KHz, 50 KHz
and 100 KHz (at least) *with equivalent transmitter noise output*
in 500 Hz and 2400 Hz bandwidths for a 1500 Watt signal.

ARRL have generally done a poor job in explaining the issues of
transmitted phase noise - perhaps because of the substantial number
of rigs with transmitted phase noise greater that -128 dBc/Hz at
100 KHz or more.  When one considers than 1500 W is +62 dBm, phase
noise at -128 dBc/Hz represents a substantial interfering signal
for a distance of several miles at HF - potentially S7 or S8 (ca.
-80 to - 85 dBm) in an SSB bandwidth at 100 KHz or more from the
transmitting carrier.

Transmitted phase noise is not just a problem for Field Day
any more <G>!

73,

   ... Joe, W4TV


On 10/20/2015 4:48 PM, Walter Underwood wrote:
> I wish the transmitted noise was presented more like a proof of performance.
>
> One line for the FCC requirement, then a broad line showing the curves of the three best rigs tested so far.
>
> That would give a clear view of whether this transmitter was just barely good enough or among the best.
>
> wunder
> K6WRU
> CM87wj
> http://observer.wunderwood.org/ (my blog)
>
>> On Oct 20, 2015, at 1:30 PM, Scott Manthe <scott.manthe at gmail.com> wrote:
>>
>> Maybe. Or maybe the copy editor is a fan of Flex gear. 😊
>>
>> Rick, K2XT is correct. Not to go off the deep end here, but a simple correction doesn't undo the damage to Elecraft's reputation that this "error" appearing in print has caused. QST really should reprint the entire review with an explanation of why it is doing that. Maybe they need to reassess (yet again) the quality control in their editorial process.
>>
>> 73,
>> Scott N9AA
>>
>> On 10/20/15 4:08 PM, Bill wrote:
>>> This is what happens when there is less then careful/knowledgeable proof reading.
>>>
>>> Bill W2BLC K-Line
>>>
>>
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