----- Original Message -----
From: "Bill, W6WRT" <dezrat1242@yahoo.com>
To: <amps@contesting.com>
Sent: Thursday, March 10, 2011 9:19 PM
Subject: Re: [Amps] Tuner Loss
> ORIGINAL MESSAGE:
>
> On Thu, 10 Mar 2011 11:40:19 -0500, "Carl" <km1h@jeremy.mv.com> wrote:
>
>>
>>165W of loss in a well constructed tuner shouldnt even be a discussion
>>point. Tank circuit loss in a 1500W amp is much more and we accept it as
>>normal.
>
> REPLY:
>
> Absolute nonsense. Apples and oranges.
>
I would expact that sort of comment from you.
It was only meant to show that the coil heat we take for granted in an amp
is rarely a concern and many (even the most expesive) take no special
cooling measures.
Tuner design is strictly cost driven so marginal components are used. An
ideal 160-10M 1500W + tuner using 4500V 500pf variables and an edge wound
rotary inductor would cost a couple of thousand dollars if sold
commercially.
> Reactances such as found in a properly designed tuner should be nearly
> lossless.
Losses in your typical commercial tuner are in the inductor as the low C
used on 80-160 are the problem. This was shown decades ago in ARRL reviews
of available tuners.On 160 in particular it was shown that a "matched"
condition was possible with the inductor absorbing the full power.
> Basic tube and AC theory, Carl. Time to hit the books.
Yes you should Bill, and more than one.
Carl
KM1H
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