[Lowfer] PBO

[rick kirby]

Hi Bill,
 Thanks for all the help youve given me in the past to get me this far.Last 
year I explained I could only put up a 40 x 60 loop for now but I was 
running classE at the time.
 Im still using the same loop but with your final .The terrain here is 
typical mountain junk!!Clay soil over slate and rock; which is why I opted 
for a loop.I couldnt put anything other than a raised ground system here.
 I took a few measurements but dont know how to interpret them! I am using a 
multimeter that reads AC in"true RMS". Across the loop terminals Im reading 
2 VAC. I  then whipped together the  100 turn ferrite into 100 ohm probe you 
described.When I routed 1 leg of the loop through it ,I read 180ma AC ? My 
RAC   according to your equation should be 1.09 ohms but I havent taken a DC 
resistance reading on it yet.
 I am running about  46ma  at 22 volts to the  final ..
  I really need to find a circuit for a current meter that is calibrated and 
doesnt need a scientific calculator to figure out the results ! HI HI !
 Anyway, Jay  W1VD  gave me a screen shot from CT. the first day so I guess 
its going somewhere.
 I have more testing to do but the new rig and frequency seem to be an 
improvement.

 Thanks Again
  Rick  KA2PBO   "PBO" 187.2  QRSS/20




----- Original Message ----- 
From: "Bill Ashlock" <ashlockw at hotmail.com>
To: <lowfer at mailman.qth.net>
Sent: Sunday, September 20, 2009 4:01 AM
Subject: [Lowfer] PBO


>
> Hi Rick,
>
>
>
> I'm not sure if we have conversed before about your Ashlock Loop. Can you 
> tell us about the dimensions, conductor diameter, conductor RAC if 
> possible (or just the loop current at a 1w transmitter output)? Is your 
> soil there quite rocky? I think I reported last season about the poor 
> effective radiation from my Ellsworth NH mountain site versus the same 
> loop here in Andover, MA, so I'm anxious to see if you experience similar 
> results.
>
>
>
> I have also tried to use Class E finals with my loops but found they are 
> quite frequency sensitive and require retuning whenever the loop 
> configuration is changed. When I run comparitive antenna tests I can't 
> afford to introduce non-antenna related variables and the Class D final 
> requires no tuning except for the loop resonating capacitor. It's also 
> really hard to beat the simplicity in setting up a Class D final and 
> verifying performance by looking for a neat square wave. Also don't let 
> anyone tell you that you need an output filter at this low power level.
>
>
>
> Happy looping!
>
>
>
> Bill Ashlock
>
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