[OKDXA] K9AY loops

[K5TT]

You are not that different since I have the SteppIR
and same 40m.  Chances 
are you can get a match with one cap and a shunt at
some point on the tower. 
Most of us only operate between 1810 and 1860 so you
might get that much 
band width without a motor.  Good luck.

Jim

----- Original Message ----- 
From: "Kim Elmore" <cw_de_n5op at sbcglobal.net>
To: "Discussion of OKDXA" <okdxa at mailman.qth.net>
Sent: Tuesday, November 06, 2007 7:10 AM
Subject: Re: [OKDXA] K9AY loops


> Hi Jim,
>
> My tower is only about 48 ft tall with an 8 ft mast,
KT34A and a 40CD2 on 
> it. I didn't modify the KLM, so all the elements are
insulated form the 
> boom, That means I really have only the booms and
one element of the 40CD2 
> as top loading, so mine is pretty short
electrically.
>
> I think I'll run the shunt all the way to the of the
tower, and space it 
> about 24" or so. I have a couple of vacuum
variables, 1000 pf and 500 pf, 
> good for 8 kV and 10 kV, respectively, so I have
capacitors. I think I 
> also have a coil I can use if I need to lash
together an L-network to get 
> a match. Once I have something that works, I'll get
an enclosure and maybe 
> a motor drive for the capacitor so I'm not
essentially rock-bound.
>
> I'll only use the tower for 160 as I have a F12
Sigma 80 for 80 m. Last 
> night, I could barely hear the E7 on 80 m using the
Sigma 80. I really 
> wish I'd had the loops up and going to do a rx
comparison. Maybe this 
> weekend...
>
> 73,
>
> Kim N5OP
>
> At 06:36 AM 11/6/2007, you wrote:
>>Hi Kim,
>>
>>I am using a shunt fed tower on 160m.  Just use a
>>variable capacitor in series with the shunt.  I vary
>>the cap for lowest SWR.  I have a 30 foot shunt out
>>abt 18 inches on a 70 foot tower and the cap is abt
>>560 pfd's.  Any variable cap will work for testing
but
>>you will need to get something that will handle your
>>power for operation.
>>
>>Jim
>>
>>--- Kim Elmore <cw_de_n5op at sbcglobal.net> wrote:
>>
>> > Well, I've finally put up my K9AY loops, obtained
>> > from Array
>> > Solutions.  It includes the fiberglass mast and
>> > phase switching box
>> > at the base, along with control head/preamp.
>> >
>> > That said, it's not all wired up yet. It's a bit
of
>> > an ordeal to get
>> > the thing up, though nothing terrible. The
>> > instructions have some
>> > rough edges that led to some minor confusion,
though
>> > nothing serious.
>> >
>> > I still need to fabricate a coax line and control
>> > cable out to the
>> > control box, dig a shallow trench to put 'em in,
and
>> > do some final
>> > trimming on the loop wires to get everything
snugged
>> > up. The antenna
>> > will be at the end of about 300 ft of
transmission
>> > line, and the
>> > instructions say that long lines can lead to
>> > ground-loop issues.
>> > Burying the wires helps alleviate any such
problems
>> > (so Array Solutions says).
>> >
>> > I'm anxious to try this thing out given
everything
>> > I've read about
>> > it, but I gotta do one thing at at time.
>> >
>> > I still need to attach the shunt feed to my
>> > relatively short tower.
>> > Anyone with experience in this regard have any
>> > suggestions?
>> >
>> > 73,
>> >
>> > Kim Elmore
>> >
>> > _______________________________________________
>> > OKDXA mailing list
>> > OKDXA at mailman.qth.net
>> > http://mailman.qth.net/mailman/listinfo/okdxa
>> >
>>
>>
>>__________________________________________________
>>Do You Yahoo!?
>>Tired of spam?  Yahoo! Mail has the best spam
protection around
>>http://mail.yahoo.com
>>_______________________________________________
>>OKDXA mailing list
>>OKDXA at mailman.qth.net
>>http://mailman.qth.net/mailman/listinfo/okdxa
>
> _______________________________________________
> OKDXA mailing list
> OKDXA at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/okdxa
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com