[50mhz] Stack spacing question

[Richard J. Fiero II W5TFW]

IMHO,

 while the SWR might be ok.  stacking messes up the performance on ground 
wave.


                                                                             
             Joey







                                          Richard J. Fiero II
                                    A.R.S. W5TFW // V44TFW

I think our Members of Congress should wear uniforms like NASCAR drivers so 
we could identify their corporate sponsors.


----- Original Message ----- 
From: "Danny Pease" <dpease at adams.net>
To: "'Carl'" <km1h at jeremy.mv.com>; "'Mark Drieci'" <guitar0145 at gmail.com>; 
<50mhz at mailman.qth.net>
Sent: Saturday, August 20, 2011 9:02 AM
Subject: Re: [50mhz] Stack spacing question


> Theory and conventional wisdom are not always obtainable.
>
> I have seen installations of 6 and 2 meter beams with as little as 2 foot
> separation and performance was as good as a single antenna on a tower by
> itself. WD5AGO did some testing on VHF and UHF antennas and his results
> showed very little change in performance up to the point the SWR was
> affected by the close spacing. Many rovers have antennas within inches of
> each other and get very good performance.
>
> My personal thinking is use all the spacing you can provide and don't get
> bent out of shape if it isn't as much as "conventional wisdom" says you
> need.
>
> Danny NG9R
>
>
> -----Original Message-----
> From: 50mhz-bounces at mailman.qth.net [mailto:50mhz-bounces at mailman.qth.net]
> On Behalf Of Carl
> Sent: Saturday, August 20, 2011 8:32 AM
> To: Mark Drieci; 50mhz at mailman.qth.net
> Subject: Re: [50mhz] Stack spacing question
>
> What sort of conventional wisdom? Electrical or mechanical?
>
> I currently have a 3 el 20M on a 21' boom, next up is a 28' boom on 432 
> and
> and at the top is 35' of 8el for 6M.
> Spacing bottom up is 4' and 5' and the 432/50MHz appear to work exactly as
> when tested alone. Another 432 will be added  soon.
>
> Carl
> KM1H
>
>
>
> ----- Original Message ----- 
> From: "Mark Drieci" <guitar0145 at gmail.com>
> To: <50mhz at mailman.qth.net>
> Sent: Saturday, August 20, 2011 4:43 AM
> Subject: [50mhz] Stack spacing question
>
>
>>I am erecting a new VHF tower with a modified Cushcraft A505 (18 foot 
>>boom)
>> and a Cushcraft 17B2 (31 foot boom) in a vertical stack.
>>
>> Conventional wisdom suggests that the 6M antenna be placed atop the 2M
>> antenna as it has the shorter boom.
>>
>>
>>
>> I have read the section of the ARRL Antenna book where it describes
>> stacking
>> scenarios of the 2M over 6M beams, but there are none described that are
>> similar to my own.
>>
>> I am seeking input from the list members on the optimal stacking distance
>> between the two yagis to minimize interaction
>>
>>
>>
>> Any comments on this subject are greatly appreciated.
>>
>>
>>
>> Thank you in advance.
>>
>>
>>
>> Mark - KA4MAY
>>
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>
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