[Elecraft] high-power tuner

[Don Wilhelm]

Bob,

One can construct a link coupled tuner that will have even greater 
efficiency than the venerable Johnson Matchbox.  It will have plug-in 
coils, and the antenna will connect to taps on the coil rather than 
using a differential capacitor - that tuner will have a greater matching 
range than the Matchbox as well as having less loss.  The drawback is 
that it does not lend itself well to bandswitching.  OTOH, it does not 
need to be in an enclosure, can be built on a piece of wood (yes, mine 
is built on a wooden board), so the plug-in coil is easily accessed and 
changed to whatever band one wants ot operate on. Once the settings for 
any one antenna have been established and recorded, changing bands takes 
less than 30 seconds.

As L.B.Cebik has stated many times, link coupled balanced tuners are the 
most efficient.  Their loss is close to zero.

73,
Don W3FPR

On 3/9/2012 7:56 PM, Bob K6UJ wrote:
> QST had an article a while back comparing tuners, MFJ, Palomar, Drake and several others if I remember correctly.
> They had a chart showing the loss per band per each tuner.
> They included the old Johnson Viking matchbox in their ranking too.  The old Johnson was right up there
> in the top rankings, with very low loss.  I wish I still had my old Johnson, sigh...............
> Anyway a search on the ARRL webpage for QST articles about tuners should show the article.
>
> Bob
> K6UJ
>
>
>
> On Mar 9, 2012, at 2:10 PM, W5RDW wrote:
>
>> Never had any reason to wonder if my MFJ-998 has more than normal loss. It
>> hasn't let any smoke out of the cabinet yet! I use to run a Drake L-7 thru
>> it, but now use the KPA500 all the time and have retired the Drake.
>>
>>> /Most of the MFJ tuners tend to rank pretty low in that respect./
>> Dave, I'd be interested in reading about the info you have on the MFJ tuner
>> loss.
>>
>> -----
>> Roger W5RDW
>> --
>> View this message in context: http://elecraft.365791.n2.nabble.com/high-power-tuner-tp7314904p7359740.html
>> Sent from the Elecraft mailing list archive at Nabble.com.
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>