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Re: [Amps] hf-2500

To: "Amps" <amps@contesting.com>
Subject: Re: [Amps] hf-2500
From: "Jim W7RY" <w7ry@centurytel.net>
Reply-to: Jim W7RY <w7ry@centurytel.net>
Date: Wed, 19 Dec 2012 17:16:33 -0800
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Bill

We already had this discussion on here about a year ago. But I 'm going to repeat it.

Alpha, Ameritron, Jerry K8RA, myself W7RY, and many others all use toroids with shorted turns on our "L" coil in a PI-L circuit. It works just fine.

Do you mean that a shorted turn toroid for the PI network is not good? Or are you making a general statement that they don't work at all in an amplifier?


73
Jim W7RY


-----Original Message----- From: Bill Turner
Sent: Wednesday, December 19, 2012 12:26 PM
To: Amps
Subject: Re: [Amps] hf-2500

ORIGINAL MESSAGE:
On Wed, 19 Dec 2012 17:15:03 +0000, K1TTT wrote:

Agreed, that is why I have modified one to do only 40-10m... removing the
80m and 160m coils from the toroid removes the shorted turns problem and
makes it run very nicely doing rtty on 40m.

REPLY:
As David found out, shorted turns on a toroid or any iron core coil
are a no-no unless you do some very careful design and testing, which
Command obviously did not do. Shorted turns on an air core coil are
usually no problem. A word to the wise.

73, Bill W6WRT
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