|Subject:||Re: [TowerTalk] Mounting A Solenoid Balun?|
|From:||Bill Coleman <email@example.com>|
|Date:||Thu, 28 Oct 2004 22:19:57 -0400|
On Sep 29, 2004, at 10:52 PM, W7TMT wrote:
I'm just finishing up refurbishing a 12 year old A3S and adding the 40 Meter kit that's been languishing in the basement for a long time. After researching the various balun options I decided to go with a solenoid style. Using the excellent data available on the Web by Tom, W8JI and Ed, WA2SRQ I'm winding 12 turns of RG-213 on a 4 1/2" PVC form. Unless I'm missing something that should be in the ballpark for 40 thru 10 meters.
I was doing something like this a few years back. I had refurbished my A3S and was working on a balun. I was going to use 10 turns of RG-213 on a 4" ID PVC form. My plan was to use a U-bolt and fasten the far end of the PVC to the boom. In order to get to the ends of the U-bolts, one end of the PVC was cut at a 45 degree angle, the other cut square.
I thought about the proximity of the boom affecting the coil. A flat plate would act as a shorted turn and reduce the inductance. So, I cut about 16 inches of pipe, to position the coil a couple of diameters away from boom.
In the end, though, I found some #77 ferrite beads cheap that would fit over RG-213. I measured the impedance of one, and used 10 (about 16") of beads.
Bill Coleman, AA4LR, PP-ASEL Mail: firstname.lastname@example.org Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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