[50mhz] Modifying Cushcraft A50-5S

[Carl]

The T match info is right in the Cushcraft 616B Boomer manual. Ive turned 
that into 8el with 13.2 dBi gain and 40 dB F/R without adding any boom 
material. Thats my daily driver for almost 20 years.

>From what I see in the VE7BQH list posted today it has higher gain per boom 
length than anything listed. According to YO 6.5  its within .2 dB of 
theory.

Carl
KM1H


----- Original Message ----- 
From: "John Kemker" <john at kemker.org>
To: "50mhzer's" <50mhz at qth.net>
Sent: Friday, June 26, 2009 4:05 PM
Subject: Re: [50mhz] Modifying Cushcraft A50-5S


> I've had a couple of folks send me the W5WVO mods, which I much
> appreciate.  That lengthens the boom length with an easy mod and still
> uses the gamma match.
>
> As far as building a T-Match, I don't mind, as long as there's some
> decent instructions.  I've got plenty of 75ohm cable and F connectors
> and am purchasing some new F female connectors next payday to finish a
> 160m RX Loop.  Purchasing a few more for the balun for a T-Match is only
> $1 more.
>
> DX Engineering has the 1.5" X 72" boom addition for the W5WVO design for
> under $14.  I'll be ordering that next payday, also.
>
> Carl wrote:
>> There is only about .1dB to be gained on that boom length. However the 
>> F/R
>> can be much improved from 18 to 28dB if noise is an issue. That boom 
>> length
>> is better for 4 elements at 10 dBi gain and 26 dB F/R if you dont mind a 
>> DE
>> impedance of around 17 Ohms which can easily be stepped up with a T 
>> Match.
>>
>> In order to adapt any new design that original gamma match has to go. I 
>> use
>> the all metal T Match in all my designs.
>>
>> Unfortunately I havent added these designs to a PC file yet but can snail
>> mail it. This was designed about 12-13 years ago using YO, built and
>> verified. However that HD is long since crashed and I cant find the 
>> floppy
>> backups.
>>
>> Plus I still cant get YO 6.5 functioning on a XP PC with the DOS 
>> simulators
>> Ive tried.
>>
>> Anybody have YO 7.5 they are willing to share?
>>
>> Carl
>> KM1H
>>
>>
>>
>> ----- Original Message ----- 
>> From: "John Kemker" <john at kemker.org
>>> I was wondering if anyone had come up with an improved layout/spacing
>>> using the A50-5S as a basis?  I have an A50-5S, but feel that there
>>> should be some way to improve the performance with a few
>>> modifications/changes.  Anyone have any suggestions?  I can lengthen the
>>> boom, change the lengths and spacing of the elements, etc.  I'm not
>>> going to be able to do much in the way of modifying the gamma match, or
>>>
>>>
>>> adding extra elements.
>>>
> -- 
> --JohnK
> 73 de W5NNH
> 10X 75371/M&M 117/SMIRK 6185/Six Club 285/TRA 2499/Norcross 228 F&AM
>
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