[TowerTalk] K6STI Receiving loop question
Joe - WDØM
WD0M at centurytel.net
Thu Nov 18 15:16:12 EST 2004
Good point - how close is "close enough" - but if you're doing it the first
time, why not 'do it right" instead of having to do it over? :-)
73,
Joe
WDØM
At 01:11 PM 11/18/2004, Pete Smith wrote:
>On the other hand, if it is a receiving antenna, do you care? The
>additional loss in the feedline due to SWR *may* be trivial in this
>application.
>
>73, Pete N4ZR
>
>At 02:51 PM 11/18/2004, Joe - WDØM wrote:
>
>>Hi Dave,
>>
>>Perhaps the easiest way (if you have an antenna analyzer or access to
>>one) is to check the impedance at the antenna using an antenna
>>analyzer. That will tell you which way to go in modifying the turns
>>ratio. I just put a beverage antenna together, and the analyzer was very
>>helpful in assembling the transformer. I used my Autek analyzer - and
>>it's probably the best investment I've made to be sure every watt I own
>>gets to the antenna and then on to the other guy's radio. ;-)
>>
>>73,
>>Joe
>>WDØM
>>
>>
>>At 11:47 AM 11/18/2004, Dave Quick wrote:
>>>I recently put up a K6STI loop for 80m. It's about 8 feet off the ground
>>>and built according to the plans in the Sep. 95 issue of QST. It's 21
>>>feet on each side and I used 450 ladder (window) line and a 77 mix
>>>ferrite bead for the transformer.
>>>
>>>My problem is that I can't get the SWR below about 3:1 or so. I do get a
>>>dip as I adjust the cap, but never below 3:1. I'm guessing that I need
>>>to adjust the turns ratio of the transformer, which is 4 turns to 10
>>>turns as the QST article specifies, but I'm not sure which way to go
>>>with the turns ratio.
>>>
>>>Does anyone have an advise for me?
>>>
>>>Thanks.
>>>
>>>Dave Quick K0EKL
>>
>>
>>_______________________________________________
>>
>>See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
>>Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
>>any questions and ask for Sherman, W2FLA.
>>
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>
>
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