[Elecraft] (KX3/2) Backpack loop thread

Fred Jensen k6dgw at foothill.net
Fri Jan 25 14:01:04 EST 2019


Hmmm ... I use an Alexloop with my K2.  Since the real part of the feed 
point impedance of a single-turn small mag loop is so low, one design 
goal is to reduce the resistance of the the loop parts ... larger 
conductor, butterfly capacitors with no moving connection, etc.  Do the 
multiple turns increase the radiation efficiency enough to outweigh the 
increased I squared R loss of the longer conductor?

Ignoring that loss for a moment, what is the effect of multiple turns?  
Do multiple turns affect the bandwidth?  Just curious, small effective 
antennas are of interest now that I've moved from a 5 acre "farm" in 
Auburn CA to a suburban house/lot in Sparks NV [with a somewhat 
benevolent and benign HOA].

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 1/25/2019 9:17 AM, Dave G. wrote:
> There is no reason to limit the loop to a single turn.
> A 3 turn 1ft diameter loop should be tuneable to 40M !
> RG58 or simiar?
>
> Dave G.
> KK7SS
>



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