Topband: PHASING SHUNT FED TOWERS

[Dan Edward Dba East edwards]

I miss Earl too...he always told me I was loud...HE was always loud, and usually working somebody i couldn't hear...he also did some great work with Flags, early on...
73, w5xz, dan

--- On Fri, 5/31/13, Carl <km1h at jeremy.mv.com> wrote:

From: Carl <km1h at jeremy.mv.com>
Subject: Re: Topband: PHASING SHUNT FED TOWERS
To: "Jon Zaimes AA1K" <jz73 at verizon.net>, "160" <topband at contesting.com>
Date: Friday, May 31, 2013, 12:04 PM


----- Original Message ----- From: "Jon Zaimes AA1K" <jz73 at verizon.net>
To: "160" <topband at contesting.com>
Sent: Friday, May 31, 2013 4:31 AM
Subject: Re: Topband: PHASING SHUNT FED TOWERS


> 
> On 5/31/2013 12:43 AM, Tree wrote:
>> 
>> K6SE was the first guy I saw doing this - with much shorter towers than
>> mine.
>> 
>> 
> Somewhere in my files I have a copy of a four-page letter Earl sent to K2UU describing in detail the K6SE phased towers -- one of the few multielement transmit arrays in use on the band in those days (1970s-80s).
> 
> If I recall correctly, they were HDBX style 64-foot self-supporting towers spaced about 80 feet. One had a large tribander on it, and the other a 2-element shortened 40-meter yagi. Earl described how he raised and lowered the 40-m. beam on its mast till that tower resonated at the same spot as the other one. He used identical shunts and a coax delay line to achieve the correct phasing. His letter included a formula for calculating this delay line based on the distance between the towers.
> 
> This played quite well. We chatted many a night and Earl would flip the switch and I'd see 25 db f/b or so.
> 
> 73/Jon AA1K
> Delaware


I sure miss Earl. One fine gentleman that wasnt afraid to share details of any of his designs and answer questions with even more details.

Carl
KM1H 
All good topband ops know how to put up a beverage at night.
_________________
Topband Reflector