MFJ then copied that design Bob, but uses the newer brass ring with fingers,
but otherwise looks very much the same. I own one for portable use and it
works fine.
Eric
W9WLW
http://w9wlw.blogspot.com/
Bob McGraw - K4TAX <RMcGraw@Blomand.net> wrote:
>The earliest version of the "screwdriver" antenna as I recall were actually
>manual tuned devices. I recall them being sold under the name of Bandmaster
>or Super Bandmaster. Basically described as a short mast, followed by a
>long coil with a sliding roller which shorted out the turns to change band.
>This coil as I recall was some 2" to 3" in diameter and some 18" in length.
>It was then attached to a 4 ft to 5 ft whip extending out the top. Changing
>bands was a matter of sliding the rod with the roller attached up or down.
>The shaft of the roller assembly was marked generally in bands to aid in
>quick band changes. Today's antenna simply adds a DC motor and controller
>to remotely change the tuning or bands.
>
>A friend had one mounted on the driver side rearview mirror frame attached
>to the door of his van. He operated CW with a Galaxy V as I recall. He
>would change tuning or change bands while driving. Talk about "distracted
>driving" Wow, that was way before the cell phone rage of today.
>
>73
>Bob, K4TAX
>
>
>----- Original Message -----
>From: "John" <jlockj@earthlink.net>
>To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>Sent: Saturday, November 23, 2013 9:44 PM
>Subject: Re: [TenTec] 160 M antenna
>
>
>> Hi Steve,
>>
>> It took me a while to find my 1993 copy of "40 + 5 Years of HF
>> Mobileering" - it states that the first copies of the W6AAQ (Don Johnson)
>> remotely tuned screwdriver antenna were constructed and used in 1974.
>>
>> 73,
>>
>> John W0DC
>> ----- Original Message -----
>> From: Steve Hunt
>> To: Discussion of Ten-Tec Equipment
>> Sent: Saturday, November 09, 2013 3:50 AM
>> Subject: Re: [TenTec] 160 M antenna
>>
>>
>> Rick,
>>
>> That's correct!
>>
>> The only published article I know of was by Tim Forrester G4WIM in
>> RSGB's RadCom - later included in their book "HF Antenna Collection". In
>> addition to the basic top-loading principle, Tim described in detail the
>> mechanical arrangements for the auto tuning whip: a geared motor drove a
>> lead screw that progressively introduced a core into the loading coil.
>> Tim won an RSGB award for the article - the design was in many ways a
>> forerunner of the "screwdriver".
>>
>> 73,
>> Steve G3TXQ
>>
>>
>>
>>
>>
>> On 09/11/2013 09:13, Rick - DJ0IP / NJ0IP wrote:
>> > Steve,
>> >
>> > I don't understand what you are describing.
>> > I think you mean placing a screwdrive-tuned mobile whip on top of a
>> metal
>> > lower section.
>> > Correct?
>> >
>> > I have never seen or read about this.
>> > Do you know a source where we can read more on this?
>> >
>> > 73
>> > Rick, DJ0IP
>> >
>> >
>>
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>
>
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