[TowerTalk] K6STI Receiving loop question

[Joe - WDØM]

Still not a problem Pete - but if he was asking how to reduce the SWR - 
receive or not - that still didn't answer his question....just told him to 
ignore it.

73,
Joe
WDØM

At 01:32 PM 11/18/2004, Pete Smith wrote:
>Well, as a 'frinstance, if he's using RG-6 75-ohm cable, say 100 feet 
>long, and the antenna is presenting 240 ohms to the cable, on 1.8 MHz the 
>additional loss in the cable due to the mismatch is about .4 dB out of a 
>total of .8db, according to TLW.
>
>73, Pete N4ZR
>
>   At 03:16 PM 11/18/2004, Joe - WDØM wrote:
>
>>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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>>
>
>