[Amps] AL-1500 pi-network capabilities

[Rob Atkinson, K5UJ]

Thanks Rich; it is a shame the 922 isn't being made anymore.

Thanks Will for pointing out the obvious about aluminum.  If I had
thought about it more I would have realized the soldering difficulties
as i once briefly thought about using aluminum wire for antennas
and dropped the idea for that and other reasons after about 5
minutes.

73,
Rob/k5uj


From: R. Measures <r at somis.org>
To: "Rob Atkinson, K5UJ" <k5uj at hotmail.com>
CC: amps at contesting.com
Subject: Re: [Amps] AL-1500 pi-network capabilities
Date: Wed, 1 Sep 2004 18:00:58 -0700


On Sep 1, 2004, at 1:59 PM, Rob Atkinson, K5UJ wrote:

>Hi Will,
>
>thanks very much for these observations.  I apologize for not giving more 
>information.  I naively thought the photos would be enough.  interesting 
>what you said about the low frequency coil, as I have heard that having it 
>wound on a solid cylinder form may be a problem (heat buildup?).
>I wish I had one of the original h.v. transformers.  I would be glad to 
>send it to you but I guess the shop kept it.  your comments about coil tube 
>thickness and plating very interesting also.
>Why don't these amp manufacturers just bite the bullet and make us an amp 
>with the needed monster coils?

Rob -- The TL-922 is such an amplifier.  Larger diameter conductors are 
progressively used as freq increases.  It is my opinion that whoever 
designed the 922's tank had a good working knowledge of skin effect, and 
that whoever designed the AL-1500's did not. .  Not only are the 922's 
conductors sized to compensate for skin effect, cooling air is sucked 
through the tank in order to keep the inductances cool.
- cheerz

>
>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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