>> 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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