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Re: [Amps] Bandswitch source or roller inductor

To: craxd <craxd1@ezwv.com>
Subject: Re: [Amps] Bandswitch source or roller inductor
From: R.Measures <r@somis.org>
Date: Wed, 13 Oct 2004 13:20:44 -0700
List-post: <mailto:amps@contesting.com>

On Oct 13, 2004, at 10:29 AM, craxd wrote:


Manuel,

I seen some on Ebay for sale the other day. They had several different band switches and also several roller inductors. To by a new roller inductor, you might want to try Oren Elliott as I'd say their pricing would be much less than anything from Henry. The only frequencies you might run into problems with a roller inductors would be 50 MHz (6 meters). Roller Inductors have been used in homebrew and a few factory amps for years. The main thing, say for 15-10 meters, you need to make sure the coil will carry the current. If it's not large enough, the Q will be affected greatly. Here though, you could have a large DPDT relay to throw in a 10 meter coil, and use the roller inductor for lower frequencies.

No relay or switch is needed for the added 10m section since, for 10m operation, the roller L is set to zero so the only inductance in the tank is the stray L in the roller L and the 600 or so nH in the 10m section.

Oren Elliott: http://www.orenelliottproducts.com/index.html


Will Matney


Manuel R. Alonso wrote:


Hello,


Does anybody know of a good source for reasonably priced bandswitches? I called Multi-Tech industries and a decent switch costs $250.00. The nice one's at surplus sales of nebraska are also up there in price.
How about uning the Henry Roller inductors in lieu of bandswitch / tapped coil. The Henry rollers are less than $200.00 ea and that is a complete assembly.
Does the roller present a problem at the lhigher bands were very low inductance is needed in the Pi circuit?
The amp will have two 4CX800 russian tubes. tube RL = 975.


Thanks

Manuel R. Alonso

KC4MNE
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org


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