[TenTec] On Noisy Transmitters

Robert rmcgraw at blomand.net
Sat Jul 12 21:42:22 EDT 2014 

WOW!  Now I have a serious reputation to live up to. 
Thanks.  Now to whom do I send the money?  :-)

73
Bob K4TAX
 

Sent from my iPhone

> On Jul 12, 2014, at 6:37 PM, Reed Krenn <reed.krenn at gmail.com> wrote:
> 
> Mr. McGraw is the epitome of a Southern Gentleman!
> 
> We would all do well to follow his example.
> 
> Reed / WW3A
>> On Jul 12, 2014 6:27 PM, "K8JHR" <jrichards at k8jhr.com> wrote:
>> 
>> 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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