[TenTec] On Noisy Transmitters

[Kim Elmore]

I did a test with my '930S. My O II and the 930S are on a 2 pos antenna 
switch. I had the 930S feeding a dummy load and listened on the O II. I 
was surprised to hear essentially no phase noise from the 930S; I 
thought it produced a fir bit. I could certainly hear the 930 as I 
turned across it (switch provides about 60 dB isolation). Did I do 
something wrong in my admittedly primitive test set up?

Kim N5OP

On 7/6/2014 5:40 PM, Rick - DJ0IP / NJ0IP wrote:
> Jim, you are totally correct and keying problems can be a problem for any
> transmitter, whether analog or digital.
> But that was not really what I was talking about.
>
> At this point I will come out of my closet and say what I do for a living.
> I'm the tech support manager (world-wide) for Spiderbeam antennas.
> We supply various antennas to contest teams and DX-peditions, all over the
> world (in over 130 countries).
> We sponsor most DX-peditions and part of my job is helping them plan their
> antennas.
>
> But right here in Germany we had a new Multi-2 contest station claim there
> was a problem with our Spiderbeam Yagi design. Their claim was, if they
> would key either rig (in SSB) without even speaking into the mike, it
> created an S7 to s9+ noise level in the other radio, regardless of which
> band it was on, and it was worse if one of our beams (they had two
> Spiderbeams) was pointing at the other.  (duh)
> Somehow they felt our antennas were at fault.
> My job of course was to prove it was not our antennas at fault and help find
> the source of the problem.  Which I did.
>
> After much discussion, I was able to persuade the contest team to swap out
> both transceivers (TS-590s) with something else.  They replaced them with a
> TS-850 and K2.  The problem vanished. GONE COMPLETELY! They then put the
> TS-590s back in, one at a time and both totally wiped out the other station.
> They sold both TS-590s.
>
> Wayne explained what the problem was, though he wasn't aware of the actual
> problem here in Germany.
>
> This is ludicrous for a new radio on the market!  SHAME ON KENWOOD!
> Would have been the same results with a pair of FT-3000's.
>
> This has NEVER been the case with any Ten-Tec radio!
> Nor with Elecraft radios!
>
> This is the garbage I was referring to earlier.  DIRTY TRANSMITTERS!
>
> CHEAP IS CHEAP, GUYS!  CHEAP JAP CRAP ISN'T WORTH THE MONEY YOU PAY FOR IT.
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Jim Brown
> Sent: Sunday, July 06, 2014 10:47 PM
> To: tentec at contesting.com
> Subject: Re: [TenTec] On Noisy Transmitters
>
> On 7/6/2014 1:33 PM, Jim Brown wrote:
>> Clicks are generated by rise times that are too fast combined with
>> intermod distortion.
> Another point I forgot to make in this post is that many modern rigs allow
> the user to adjust the keying rise time via a menu setting. In on the air
> tests of an IC7600, clicks went from moderate to awful as the rise time was
> adjusted from slow to fast, and the default setting was closer to awful than
> moderate. You can see these measurements in
>
> http://audiosystemsgroup.com/K6XXAmpTalk.pdf
>
> 73, Jim K9YC
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-- 

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP 
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)

/"In theory there is no difference between theory and practice. But, in 
practice, there is." //-- Attributed to many people; it's so true that 
it doesn't matter who said it./