On 11/18/2011 8:36 PM, K8RI wrote:
> On 11/18/2011 4:50 PM, Jim Lux wrote:
>> Well, I've got part of the model in. Copied the dimensions from the QST
>> article and the developer's MA presentation..
>>
>> Not getting a good match yet, nor the F/B... but it's probably some
>> little fiddling needed with dimensions, etc.
>>
> Check the antenna handbook. There's been one of these in there for
> years although I don't know if it was in the last one or not. I'll have
> to check.
It isn't connected quite as I thought, but starts on page 48 on the CD
and 6-48 in the 21st edition of the Antenna Handbook as the K1WA "Sloper
System".
73
Roger (K8RI)
>
> IIRC they bring the individual feed lines back to a remote antenna
> switch mounted on the mast. The feedlines are a quarter wave with an RF
> Choke just before the antenna switch. I don't remember if they ground
> the connections other than the active one or not.
>
>
> 73
>
> Roger (K8RI)
>> CM QST switchable
>> CM Ashraf Abuelhaija design
>> CM dimensions taken from slides Vortrag_MA_Abuelhaija_Ashraf.pdf
>> CE 20m
>> SY L = 5.3'wire length
>> SY DR = .00021 ' wire radiu (0.14 mm2)
>> SY Hc = 7 ' height of center
>> SY HE = 4.35 ' height of wire ends
>> SY Y=4 'distance to side of antenna middle elements (fore aft Y=0)
>> SY X1=4.62/2 'distance fore/aft for middle elements
>> SY X=4
>> SY CL = 120 ' pf Load
>> GW 999 1 0.05 -0.05 HC 0.05 0.05 HC DR
>> 'feedpoint
>> GW 10 50 0.10 0 HC X 0 HE DR
>> 'wire #1
>> GW 950 1 -0.05 -0.05 HC -0.05 0.05 HC DR
>> 'loaded element feed
>> GW 20 50 0.05 -0.05 HC X1 -Y HE DR
>> GW 30 50 -0.05 -0.05 HC -x1 -y HE DR
>> GW 40 50 -0.10 0 HC -x 0 HE DR
>> 'wire #4, directly aft
>> GW 50 50 -0.05 0.05 HC -x1 y HE DR
>> GW 60 50 0.05 0.05 HC x1 y HE DR
>> GE 1
>> LD 5 0 0 0 58000000
>> LD 0 950 1 1 0 0 CL*1e-12
>> EX 0 999 1 0 1.0 0.0
>> GN 2 0 0 0 13.0 .005 0.0 0.0
>> FR 0 1 0 0 14.15 0.0 0.0 0.0
>> EN
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