Thanks, for the uptake Bob.
I appreciate you are the only one to provide any substantial
information, free from condescending comments, in your reply.
---------------- JHR ----------------
On 7/7/2014 8:14 AM, Bob McGraw - K4TAX wrote:
Measurements were done on my personal TS-590. I repeated this test
several times over a period of time and obtained near identical
results. A 2nd TS-590 was being used at a Field Day site. It was noted
by others that the noise increased on their receivers when the TS-590
was in transmit regardless of band or mode of operation. Coincidently,
I did have my analyzer at the site and observed this unit during
transmit. The results were almost identical to those of my personal
radio. These radios were of different ages although no production lots
or dates were noted. Rick has identified a similar occurrence and
incident in Europe with one or more of these radios. Although likely
not statistically adequate for the number sold, those reliably measured
or evaluated show 100% of those show excessive spectrum noise when in
transmit.
Under advice of council, I will not comment further, only to say that
Kenwood has been notified and supplied my test results by certified mail
some months ago. They have yet to respond.
73
Bob, K4TAX
----- Original Message ----- From: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Monday, July 07, 2014 4:08 AM
Subject: Re: [TenTec] On Noisy Transmitters
James, if you join the Elecraft group and read the history files, you'll
find lots of references.
One of them was an analysis of the circuitry in the 590, explaining
what the
technical problem was and how Kenwood could have avoided it by
spending just
a little more on better components.
BTW, both incidents I reported on had a pair of 590s, not just one.
Regardless, Bob has measurements of the 590 on spectrum analyzer, showing
the problem, and engineers have explained what the exact cause is, so
it is
a bit ludicrous to argue statistics here. Fundamentally, the reason is
"CHEAP".
If we all cry together out demanding cleaner transmitters, we will one
day
get them.
But as long as people keep sticking up for the OEMs, they aren't going to
change anything.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of K8JHR
Sent: Monday, July 07, 2014 1:39 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] On Noisy Transmitters
I put little stock in one test at one site by one group of guys on early
production units. I know there are loads of 590s in service in contest
group shacks and have been used happily on many FD sites, so the question
becomes one of statistical significance.
Rick reports on just TWO (early production) TS-590s at a German
contest club
station. I know Bob had a similar experience with one or two 590s at
a US
FD site. But I have NOT been presented with credible reports from any
other
group and this has not been discussed to ANY degree on any of the 3
TS-590
web discussion groups - and I moderate one of those lists daily.
I do not dispute these stories ... I only wonder whether 4 or 5 reported
cases is statistically significant. A great number of 590s are
playing well
among other rigs in a great number of shack world wide without
problems. My
590 was nice and quiet and played well with other rigs close by. I
cannot
get too excited over this until I see more
(credible) data and (actual) documented cases. There appears to be
far more
than 12,000 units in service, and this is just not an issue among actual
owners.
(He said reaching for his Teflon suit.) ;-)
------------------ JHR -------------------------------
On 7/6/2014 6:50 PM, Darrell Bellerive wrote:
Would you publish this list?
On Sunday, July 6, 2014 4:07:52 PM Rick - DJ0IP / NJ0IP wrote:
Every now and then we run these tests at one of our multi-multi
contest stations on all the transceivers we can find. There we have
lots of antennas but generally pretty far apart. If one of the
radios causes noise to all others, it gets banned from the site.
Most of the low cost Japanese radios have been banned because they
disturb the other 5 bands when they transmit.
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