[Lowfer] Jay's K9AY ANT

[Steve Ratzlaff]

Tom Rauch, W8JI, has some comments on how the K9AY terminated loop antenna works.
http://w8ji.com/k9ay_flag_pennant_ewe.htm

Steve
NE Oregon
  ----- Original Message ----- 
  From: Bill Ashlock 
  To: lowfer at mailman.qth.net 
  Sent: Sunday, February 08, 2009 7:16 PM
  Subject: Re: [Lowfer] Jay's K9AY ANT


  Peter, Jay, JD, and other K9AYers:
   
  Why don't we settle this conflict about how the K9AY antenna actually works by setting up a std K9AY and at a 'safe' distance away set up a loop of equal size plus an E-probe? Add the signals from the loop and E-probe together in the proper phase and amplitude and see if the results aren't exactly the same as with the K9AY. Do I have to volunteer for this one? OK.... but not until we see some 'Ellsworth Warming' :) Actually we saw a temperature above freezing today for the first time in well over a month! ... but unfortunately the prediction for tonight is under 10F :(
   
  Bill

  > Date: Sat, 7 Feb 2009 10:40:49 -0600
  > From: pbarick at niu.edu
  > To: lowfer at mailman.qth.net
  > Subject: [Lowfer] Jay's K9AY ANT
  > 
  > <<was Re: [Lowfer] WEB, WMS in CT >>
  > 
  > After viewing Jay's rendition of a K9AY ant., can it be said that it is a variant of a Loop of one turn? Or is something particular about that diamond shape?
  > 
  > Jay's configuration has 2x47ft long sides and 2x28ft sides, forming an elongated diamond. That amounts to 150ft C. and if a square would make a loop of 37ft SQ. Question: Might these two applications be equivalent antennas, correcting for effective height?
  > 
  > Observation 2: if that diamond were elongated more (same wire length) it would approach a shorted transmission line of W=>>0 and also approach a vertical (use imagination here...okay I'm being like Bill). Make sense to anyone? 
  > 
  > Also notice the coupling x-formers: FT 114-77s with the antenna side having almost 70 pri. turns. Yeeks, the winding! Given the inductance of a type 77 core, 70 turns adds up to mega inductance, no? Is there that muct reactance to deal with? Of course the design frequency is unknown, given that lashup, expect low LF capability desired.
  > 
  > --Peter
  > ---------------------------------------
  > >>> <jrusgrove at comcast.net> 02/07/09 8:04 AM >>>
  > Steve
  > 
  > A directional antenna...a large switchable K9AY that provides 20 - 25 dB front to back. Info here:
  > 
  > http://www.w1vd.com/k9ay11.pdf
  > 
  > I've used quite a few different antennas here over the years including e probes, 6' box loop, 10' 14 
  > turn Octoloop, large shielded single turn coax loops (both tuned and broadband), beverage (not long 
  > < klip'd to end >
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