[Lowfer] Antenna observations at " XR "

[Bill Ashlock]

Laurence,

You just might be utilizing the whole rebar structure of that hotel as the 'real' antenna. If this is the case you are exceeding the  Pt 15 limit for antenna "length" because you must take, according to the 'experts', the sum total of all the rebar lengths to calculate the actual length :) Seriously, at least you could do an analysis of what you are doing for a Lowdown article - as others are concrete apartment-bound in large cities. If you do this I will promise to write up an article describing a TX loop that circles my house and continues though one basement window and out the other :)

Have fun....

Bill



> From: L.Howell at conocophillips.com
> To: Lowfer at mailman.qth.net
> Date: Wed, 10 Feb 2010 19:51:59 -0600
> Subject: Re: [Lowfer] Antenna observations at " XR "
> 
> I'm loop less Bill :-(   its very interesting using such a short vertical with no loading - pf wise its probably less than a hundred pf and highly reactive - having the coils adjacent to and too close to the walls within the hotel room (with rebar),  and as is,  I can't stack all the coils vertically so  the displacement and interaction  between"parallel in field" adjacent coils is manifest - its a bit of a monster to control and match but am aided with a homebrew M0BMU designed vector phase and I/V amplitude pair of meters, as used before,  plus a neon screwdriver (!). 
> 
>  Its definately just manageable if (and a big if) you can ensure the conductor going out of the window is structural sound and in my case I've sort of stabilzed the field (it appears) by running two virtual earth conductors "bonded"  to the window frame each side of the 26 gauge wire exiting stage right.
> 
> Of course as I pass thru resonance using the varometer the magnitude and phase/loads change very quickly and I can actually hear and see the TDA 8 DIL audio amp final objecting to and cutting back power as its load and drive Z change....poor thing.... 
> 
> Luckily for me Kyle chose a device which you can do anything to for an hour or more at max specs.
> 
> 
> Now being that the antennae wire runs nearly parallel to the hotel wall some only  20ft distance as the wire falls some 40 ft down to the trees must mean additonal circulating currents are in ....
> 
> Now - and to be honest I'm astonished it works so well - its all a bit heath robinson and looking forward to the controlled and more manageable impedances of the Alaskan loop - that's if my leg and snow allows.
> 
> The vertical covert wire is on the SW side of the hotel with screening to the NE coast - but it works - just don't ask me how... :-))
> 
> Laurence 
> Two sisters bar Bartlesville....
> 
> Laurence Howell
> IC 06-630-34
> On Blackberry
> 
> ----- Original Message -----
> From: lowfer-bounces at mailman.qth.net <lowfer-bounces at mailman.qth.net>
> To: lowfer at mailman.qth.net <lowfer at mailman.qth.net>
> Sent: Wed Feb 10 19:12:00 2010
> Subject: Re: [Lowfer] Antenna observations at " XR "
> 
> 
> Laurence,
> 
> Do I dare ask what the Rac is for that loop? I can safely say you are off my chart :)
> 
> Bill
> 
> > From: hellozerohellozero at hotmail.com
> > To: lowfer at mailman.qth.net
> > Date: Wed, 10 Feb 2010 11:16:33 -0900
> > Subject: Re: [Lowfer] Antenna observations at " XR "
> > 
> > 
> > Nice Andy!  heres my artists impression of how mine would look if you could see it ...   http://kl1x.com/xdwlowfer.jpg  
> > 
> >  
> > 
> >  
> > 
> > I guess if you really really looked youll see it...
> > 
> >  
> > 
> > Laurence KL 1X/5   X DW
> > 
> > Bartlesville OK EM26AR
> >  		 	   		  
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