Re: [Amps] 160M PI network Toroidal Coil

[Jim W7RY <w7ry@centurytel.net>]

There is little to no RTTY activity on 160 meters.

73
Jim W7RY

On 10/6/2013 6:28 AM, Carl wrote:
> ----- Original Message ----- From: "Bill Turner" <dezrat1242@yahoo.com>
> To: "Amps" <amps@contesting.com>
> Sent: Saturday, October 05, 2013 11:43 PM
> Subject: Re: [Amps] 160M PI network Toroidal Coil
>
>
> > ORIGINAL MESSAGE:          (may be snipped)
> >
> > On Sun, 06 Oct 2013 00:25:36 +0000, Manfred wrote:
> >
> > > You are wrong regarding the loss. The loss isn't "essentially zero",
> > > unfortunately. Such a coil will likely end up having a Q between 300 
> > > and
> > > 350, perhaps lower if other metal objects are too close to it, or if it
> > > uses some lossy support. Now if the loaded Q of the tank circuit is 12,
> > > as is often done by design, then the coil will loose about 4% of the RF
> > > power. At 1500W output that would be 60 watts, which is enough to make
> > > that coil very hot, unless there is a strong stream of air cooling it.
> > REPLY:
> >
> > I stand by what I said. I have such a coil in my homebrew 8877 amp 
> > using #4
> > wire and it runs barely warm with the key down. I call that "essentially
> > zero" in the sense you'll never notice it.
> >
> > 73, Bill W6WRT
> However the thread is about a SB-220 which may make 1300W PEP on a 
> good day and will never be used for RTTY at more than half that due to 
> the wimpy PS.
> A pair of T200-2 toroids works fine for that as well as the thousands 
> of Alphas and other amps that have used them at up to twice the power.
> Carl
> KM1H
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