Date: Thu, 20 Aug 2015 04:37:15 +0000
To: irca@xxxxxxxxxxxxxxxx
From: nhp@xxxxxxxx
Subject: Re: [IRCA] [NRC-AM] DKAZ Antenna
If you get ambitious Jim, try a Vactrol termination, like Mark C.
used in his Flag antenna. It's amazing how stations fairly far off
the exact back end of the antenna get better nulls with a remotely
variable termination. At Grayland, it even helped kill the local noise..
best wishes,
Nick
At 15:29 19-08-15, you wrote:
>Hi Neil,
>
>Thanks from a happy DKAZ user. The antenna took 3 weekends to build,
>due to the Texas heat, clearing a path through the trees and
>gathering all the supplies. I decided to make this a permanent
>installation, using 4"x4" timber posts for the main supports and 2"
>electrical PVC pipe for the 22' supports, all seemed to work just fine..
>As for the termination, I will try a 5k pot and see if I can get a
>better null to the north. The Dallas station come in pretty good
>here, 570 KLIF, 820 WBAP, these would be the stations I would like
>to null. Also, at present I am using coax direct onto the feed end
>of the antenna, so I have not added the matching transformer as yet, next
>step.
>
>As for San Angelo stations, I have only logged KGKL 960 but nothing
>else at present.
>I really don't have enough width on my land for a side by side DKAZ,
>sounds like a great idea though.
>I am presently working on my Spanish, I know some which helps with
>station identifications, but more is helpful.
>
>Thanks
>James
>
>
>
>---- neilkaz <neilkaz@xxxxxxxxxxxxx> wrote:
> > This is good to hear about another happy DKAZ user. You may find
> that you are an even more happy DKAZ user if you spend the effort
> to manually fine tune Rt to see if you can get even better back
> nulls. This is best done in the daytime. I'd guess you might
> improve back nulls by a few dB unless 900 ohms is perfect. I do
> realize that you probably don't have much daytime stuff from 300
> deg into Austin. Does San Angelo come in?
> >
> > Do you have land to array two of these side by side for a more
> narrow beamwidth?
> >
> > If not fluent in Spanish aimed at 120 from Austin, I expect
> you'll want to improve your command of that language. 73 KAZ
> >
> > -----Original Message-----
> > >From: James Niven <jniven@xxxxxxxxxxxxx>
> > >Sent: Aug 18, 2015 8:11 PM
> > >To: 'NRC' <am@xxxxxxxxxxx>
> > >Cc: 'Mailing list for the International Radio Club of America'
> <irca@xxxxxxxxxxxxxxxx>
> > >Subject: [IRCA] DKAZ Antenna
> > >
> > >Hi All,
> > >
> > >
> > >
> > >Just wanted to report I have completed my DKAZ antenna over the
> past weekend
> > >and I have had a chance to test it out the past few nights.
> > >
> > >I followed the design as Mark Durenberger's article
> > >http://www.durenberger.com/documents/DKAZREPORT051214.pdf I built the
> > >140
> > >foot long with 22 feet high supports. I am at present using a
> 900 ohm fixed
> > >1 watt resistor and the direction is 120 degree.
> > >
> > >
> > >
> > >I have been comparing the DKAZ to my present 150 foot longwire
> > >running
> > >pretty much in the same direction, so far, the performance of the
> > >DKAZ has
> > >been very encouraging. Signals are appearing a lot stronger and
> > >earlier in
> > >the evening than the Longwire and I can tell signals from the north
> > >are
> > >reduced, while signals from the South are a lot stronger and louder.
> > >
> > >
> > >
> > >On a couple of frequencies I have checked, on the DKAZ there is a
> > >station
> > >with a decent signal while the Longwire has no station at all or
> a different
> > >station.
> > >
> > >I am still to hear a new station with this antenna but it will
> > >happen.
> > >
> > >
> > >
> > >Thanks for the fine article Mark and answering my questions.
> > >
> > >
> > >
> > >James Niven
> > >
> > >Austin, Texas
> > >
> > >
> > >
> > >
> > >
> > >---
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