[TowerTalk] QST switchable antenna

[K8RI]

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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