This depends on what it is you are trying to test.
The way we test is with both radios on antennas, not on dummy loads.
We test them with the radios on different bands, and we also test them with
the radios on the same band - but be very careful with this test.
On the different band test, be sure and avoid exact harmonic frequencies.
On the radio to be tested, simply key the mic with the mic gain all the way
down and do not speak into the mic.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Kim Elmore
Sent: Monday, July 07, 2014 1:16 AM
To: tentec@contesting.com
Subject: Re: [TenTec] On Noisy Transmitters
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@contesting.com] On Behalf Of Jim
> Brown
> Sent: Sunday, July 06, 2014 10:47 PM
> To: tentec@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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>
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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./
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