"Terman and LaPorte" - boy, that takes us back a few decades! How about
adding in Maxwell, Kraus and even Jasik since this as an antenna group?
Gene / W2LU
----- Original Message -----
From: "jimlux" <jimlux@earthlink.net>
To: "Kevin Normoyle" <knormoyle@surfnetusa.com>
Cc: <towertalk@contesting.com>
Sent: Sunday, November 28, 2010 10:14 AM
Subject: Re: [TowerTalk] Tuners
> Kevin Normoyle wrote:
>
>>
>> Rather than just bashing vendors, it would be nice if people complained
>> more
>> precisely: i.e. a tuner costing XYZ should be able to tune ABC with DEF
>> watts.
>>
>> Then we could debate if it's possible to achieve those goals for that
>> cost. If
>> so, is the argument that MFJ is pocketing obscene profits?
>> Or: that people don't know what they need?
>>
>
> I think that's a general problem in the ham radio equipment world.
> There's no "real" objective definition for "handles 1.5kW"... is that
> 1.5kW into any load? 1.5kW into a matched load? 1.5kW when immersed in
> carefully stirred and refrigerated cooling oil?
>
> And that's not even considering the usual implied duty cycle (e.g. 1.5
> kW PEP on SSB is somewhat different from a 20 minute bulletin
> transmission on RTTY).
>
> In the commercial world, one typically sees ratings with a specified
> mismatch (e.g. 2:1 VSWR) and the implication is that this is at any
> phase angle.
>
> ARRL has done a bit towards testing under somewhat standardized
> conditions, but more from a "what's the loss under some not too
> difficult to setup tests" standpoint.
>
> And, various online ham writers have done some analysis (and testing) on
> some moderately common scenarios.
>
> There's also an enormous amount of repeating in one form or another
> guidance from the books by Terman and LaPorte.
>
> > What I'd like to see is some work looking at real components used in
> real tuners. Just how much dissipation is there in those ceramic caps
> used in the LDG or SGC tuners? Ditto for the inductors.
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