[50mhz] Modifying Cushcraft A50-5S

[Renée Deeter]

Carl-
per chance did you mean the Crushcraft 6176B Antenna?
I also have the A50-5S and in need to fix/replace the (internally 
shorted- oops! )gamma match.....to something better and a T is almost 
always better.
Renée, K6FSB

Carl wrote:
> Correction to the last. With 13.2 dBi translated to 11.05 dBd that antenna 
> is right where it belongs on the BQH list. Boom is 1.71 w/l
>
> Carl
> KM1H
>
>
>
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: "John Kemker" <john at kemker.org>; "50mhzer's" <50mhz at qth.net>
> Sent: Friday, June 26, 2009 4:38 PM
> Subject: Re: [50mhz] Modifying Cushcraft A50-5S
>
>
>   
>> 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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