[Elecraft] high-power tuner

[Bob K6UJ]

Very interesting discussions about tuners/loss I didn't understand most of what was discussed anyway, hihi.

I have a little tuner history if anyone is interested.
In a letter from Don Wallace W6AM, years ago,  he told me he swore by the Johnson Viking Kilowatt tuner.  He had one connected between 
each of his Collins 75A4 receivers and his rhombics.  Not for matching, he had the rhombics dialed in very well, he said the big KW Johnson Matchbox 
was a good preselector, said he could peak up a weak signal in the noise enough to get improved copy.  He said only the big
Johnson KW tuner with the big coils  would work as a preselector, the smaller Johnson Matchbox didn't work as a preselector.  
With our radios today I doubt if the big Johnson would help any.   


Bob
K6UJ



On Mar 10, 2012, at 8:50 PM, Fred Townsend wrote:

> As one Fred to another it was funny in the heat of the battle so to speak.
> It fooled me and perhaps the case hardened too. Well done.
> 73
> Fred, AE6QL
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Fred Jensen
> Sent: Saturday, March 10, 2012 6:17 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] high-power tuner
> 
> OK folks, I am really truly sorry I started this
> tuner-efficiency-by-measuring-its-heat thread.  I apologize.  It was sort of
> an e-nerd joke and I really miscalculated the laugh-factor in it, it seems
> there was none, an unfortunate failing for me ... but too common.
> Boltzmann's Constant is in my HP48GX calculator, not that I actually know or
> care what to do with it at this point in my life.
> 
> It would be hugely difficult to get any sort of accuracy in a measurement of
> the heat lost in a tuner to find its efficiency, I never meant it to be real
> or even close to reality.
> 
> Again, I'm sorry to have been joking around on a serious list.  Won't do it
> again.  Please, everyone, use what works, have fun, enjoy the hobby with the
> great E-gear.  My KPA500 is heating the room far more than my MFJ989C.  If
> you can make QSO's, it works.
> 
> 73,
> 
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 2012 Cal QSO Party 6-7 Oct 2012
> - www.cqp.org
> 
> On 3/10/2012 4:56 PM, Fred Townsend wrote:
>> Ron, Rick, Erik: There are many reasons why temperature measurements 
>> are a poor way of evaluating a tuner. There is a method of power 
>> measure based on temperature rise. It's called a bolometer.  It only 
>> works well if the mass involved is small. Wiki bolometers if you want the
> details.
> 
> 
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