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[Amps] choke resonances

To: <amps@contesting.com>
Subject: [Amps] choke resonances
From: 2@mail.vcnet.com (Richard)
Date: Mon, 1 Jul 2002 15:44:32 -0700
>> Choke design is not rocket science.  One needs a dipmeter and some kind
>> of a winder.  I use a hand crank drill,  Winding HV-RF chokes is
>> described on my Web site.
>
>Agreed, Rich...
>It was truly a piece of cake until the WARC bands came into
>being. 20-17-15-12-10 meters have such close spacing that
>it is difficult to produce a choke that will install in any layout
>without problems. 

**  I have done it with two chokes mounted at right angles.  15MHz is a 
good parking spot. 

>The resonances can change from what
>they were on the test bench. 

** good point

>Some manufacturers (Henry,
>Creative, etc.) use two chokes to get continuous coverage
>from 1.8-30 mhz. The Ameritron/RF Parts choke comes close
>to being a cure-all if you don't operate in the 11-13 mhz region.

**  True but more L is needed for 160m operation using a tube with 
handles. 

>The B&W 800 and 802 chokes which are still very popular,
>do not have sufficient L for 160 meters, although some amp
>manufacturers used them anyway. (Alpha 77, etc.) If the Ameritron
>choke is too large for your box, the best bet is as Rich suggests;
>add a second choke and relay switch it.
>
>(((73)))
>Phil, K5PC
>
>
>
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-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
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