[TenTec] On Noisy Transmitters

[K8JHR]

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 at DJ0IP.de>
> To: "'Discussion of Ten-Tec Equipment'" <tentec at 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 at 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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