[Top] [All Lists]

Re: [TowerTalk] Was "43ft Vertical Feeding

To: "reflector -tower" <>
Subject: Re: [TowerTalk] Was "43ft Vertical Feeding
From: "Alex Malyava" <>
Date: Mon, 24 Nov 2008 11:15:23 -0500
List-post: <">>
There was an article in QST, about a year ago, regarding homebrew
remote antenna tuner with just a few controls.
Something like L-network, both C and L are driven by the same motor,
but there is a gear between them, so for one full cycle of roller
inductor there is like a hundred turns of variable capacitor. The only
controls you need are forward/reverse buttons for your motor.

On Mon, Nov 24, 2008 at 8:26 AM, Dennis OConnor <> wrote:
> Pete - right on!
> I am dismayed by the lack of the old ham spirit that I see in todays 
> operators...
> Pete pointed it out quite clearly...
> 12 relays @ $3 a pop - $36
> Roll of quarter inch dia. soft copper tubing (home depot) - I dunno, maybe $50
> 2X4 Sheet of .060" aluminium - maybe $50 ( I buy a half dozen full sheets at 
> a time so I don't know price of small amounts)  Lots less if you harvest some 
> scrap aluminium from old freezers, etc.
> Anyway, cobble up a test coil by winding some turns of #14 on a 2 - 3 inch 
> pvc pipe and get an old variable condenser and some jumpers, and use them to 
> test tune each band... Measure the inductance and capacitance you find for 
> each band......
> Wind a coil from the copper tubing to the found value(s)..
> Make the condensers by cutting two plates from the aluminium sheet and 
> spacing them apart with little buttons of plastic - lexan from the hardware 
> works good - and adjusting the overlap of the plates for final tune... When 
> tuned squirt a dab of crazy glue on the buttons to lock the plates into 
> position...
> Repeat 5 more times and voila - 6 bands
> Another $20 for a covered plastic storage bin to mount the parts and relays -
> and for ~$150 you have a six band, switchable tuner, that will take ALL the 
> power your amp can make and then some....
> And for lots less than $150 if you have some scrounging skills...
> denny / k8do
> _______________________________________________
> _______________________________________________
> TowerTalk mailing list

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>