Re: Topband: Shunt feeding AB-577/621

[donovanf]

Hi Pete, 


I'd suggest you proceed with an inverted-L 


73 
Frank 
W3LPL 

- Original Message -

From: "N4ZR"  
To: "topband reflector"  
Sent: Monday, October 1, 2018 3:47:37 PM 
Subject: Topband: Shunt feeding AB-577/621 

I have an AB-577 with a C-3E on top, and am interested in the 
possibility of shunt-feeding it for 160 - 100 watts only. Anyone have 
any experience with doing this? Are the section-to-section joints 
adequately conductive? I would plan to use an omega match, because I'm 
guessing it would be well short of a quarter wave. 

My other option is an inverted L. Should I maybe just go ahead with that? 

-- 

73, Pete N4ZR 
Check out the Reverse Beacon Network 
at , now 
spotting RTTY activity worldwide. 
For spots, please use your favorite 
"retail" DX cluster. 

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Re: Topband: Shunt feeding AB-577/621

[Joe Subich, W4TV]

On 2018-10-01 11:47 AM, N4ZR wrote:
> I have an AB-577 with a C-3E on top, and am interested in the
> possibility of shunt-feeding it for 160 - 100 watts only.  Anyone have
> any experience with doing this?  Are the section-to-section joints
> adequately conductive?

The section joints should be adequately conductive given the surface
area.  The big questions would be an adequate connection at the top
and conductivity through the "launcher."


My other option is an inverted L. Should I maybe just go ahead with
that?

Since the standard AB-577 is 48' tall, even with the boom of your
C-3E you are only about 1/8 wave tall on 160.  It will take a good
deal of additional top loading to make the standard AB-577 reasonable
on 160 meters ... I'd consider hanging an inverted L off the side.
Probably easier in the long run.

73,

   ... Joe, W4TV


On 2018-10-01 11:47 AM, N4ZR wrote:
I have an AB-577 with a C-3E on top, and am interested in the 
possibility of shunt-feeding it for 160 - 100 watts only.  Anyone have 
any experience with doing this?  Are the section-to-section joints 
adequately conductive?  I would plan to use an omega match, because I'm 
guessing it would be well short of a quarter wave.


My other option is an inverted L.  Should I maybe just go ahead with that?


_
Topband Reflector Archives - http://www.contesting.com/_topband

Topband: Shunt feeding AB-577/621

[N4ZR]

I have an AB-577 with a C-3E on top, and am interested in the 
possibility of shunt-feeding it for 160 - 100 watts only.  Anyone have 
any experience with doing this?  Are the section-to-section joints 
adequately conductive?  I would plan to use an omega match, because I'm 
guessing it would be well short of a quarter wave.


My other option is an inverted L.  Should I maybe just go ahead with that?

--

73, Pete N4ZR
Check out the Reverse Beacon Network
at , now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

_
Topband Reflector Archives - http://www.contesting.com/_topband