[TenTec] James

[Kim Elmore]

Well, now... Both sides of the argument have erroneously responded to 
the list with what they intended as private. I say we chuck all of this 
nonsense and get on the air! Last night before sunset I heard a distant 
AM station on top of a local station, so the geomagnetic field must be 
pretty quiet.

As an aside (if anyone cares) I fixed the little switching PS in my 
Anciente TS-930S microprocessor board. The primary of the little 
transformer is center-tapped and one side was open -- that side had the 
cold switching transistor. Had to look under magnification, but it 
looked to be a bad solder joint. Touched them all up and Presto! All 
problems solved.

I then proceeded to investigate the transmitted phase noise of both my 
Orion II and my TS-930S using by guess and by gosh techniques. I simply 
transmitted 100 W carrier into a dummy load and listened via the 
deselcted port of my antenna switch. I could see the TS-930S raise the 
noise floor a bit on the S-meter of my O II when I was a couple of 
hundred kHz away from the carrier. When I inverted the test, I could not 
see the O II in the '930S receiver (I've installed an optional 6 kHz 
wide INRAD roofing filter in the rx). While the '930S isn't nearly as 
bad as some rigs I've seen (the older Yeasu rigs, like the 757 and its 
derivatives were nothing short of horrific) it's worse than my O II, 
which is no surprise at all and, in fact, a little reassuring. OTOH, the 
28 V PA has a much better transmitted IMD (according to ARRL lab tests) 
than does any 12 v transmitter.

Which brings me to a final point: According to what I've read here, 
upping the supply voltage from even 12 V to 13.8 V makes a significant 
difference in transmitted IMD. So, I looked in my manuals and found that 
every piece of 12 V gear I own is rated to be good for at least 15 V 
supply voltage (most say 16 V, but the O II says 15 V). So, I upped the 
12 V supply to regulate at 14.9 V and take the regulation from the 
distribution rail instead of at the power supply output. Max power 
output of the O II is unchanged, but I'm hoping the IMD is a bit better.

Kim N5OP

On 7/26/2014 4:05 PM, Bob McGraw - K4TAX wrote:
> Well crap!  OH well it's out. I said it and in error let it go public. 
> I'll take my whipping.  Sorry folks my poor judgment.
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message ----- From: "Bob McGraw - K4TAX" 
> <RMcGraw at Blomand.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Saturday, July 26, 2014 4:01 PM
> Subject: [TenTec] James
>
>
>> I see not only is he pestering you, he's pestering me.   I'm about 
>> ready to "jump his shit, big time". If he wants to "try me on" he 
>> needs to do it privately and not on the reflector.
>>
>> The charts on his website are totally misleadding.  That's his take.  
>> He's the lawyer, he's twisted the facts and he's wrong and is not man 
>> enough to admit to such.   I'm very dissapointed.
>>
>> I did BCC you on one of his e-mails and my response.  I see that 
>> Sinista also pointed out his errors.  It is incorrect stuff like this 
>> that gives any product a bad rap.
>>
>> Oh well, I've gotten the grass cut, some house cleaning done and a 
>> few beers down the pipes, of course after they were properly 
>> processed through my kidneys.
>>
>> Not a bad day after all.
>>
>> 73
>> Bob, K4TAX
>>
>>
>>
>>
>>
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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./