Hi everyone - thanks to the help I received from Colin Newell, Nick
Hall-Patch, Mark Durenburger and others, the DKAZ is now up and operative.
Not a trivial antenna to assemble and get going! I thought that it would be
best if I started with a basic one (non-reversible) and then added
reversability
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
n us.
Cheers!
Mark Durenberger
-Original Message-
From: Michael Yule
Sent: Wednesday, August 31, 2016 5:49 AM
To: irca@hard-core-dx.com
Subject: [IRCA] DKAZ
Hi everyone - thanks to the help I received from Colin Newell, Nick
Hall-Patch, Mark Durenburger and others, the DKAZ is now up and
For those of you who have DKAZ antennas, which preamp do you use? Do you
find it makes much difference whether you put it at the antenna or in
the shack?
I need to "finish" construction on mine. Right now, I have two 470-ohm
resistors alligator-clipped together for the null end, and a hand-wou
#x27;ll want to
improve your command of that language. 73 KAZ
-Original Message-
>From: James Niven
>Sent: Aug 18, 2015 8:11 PM
>To: 'NRC'
>Cc: 'Mailing list for the International Radio Club of America'
>
>Subject: [IRCA] DKAZ Antenna
>
>Hi All,
>
o be enlightened...
Cheers!
Mark Durenberger
-Original Message-
From: neilkaz
Sent: Tuesday, August 18, 2015 8:41 PM
To: Mailing list for the International Radio Club of America ; 'NRC'
Cc: a...@nrcdxas.org
Subject: Re: [IRCA] DKAZ Antenna
This is good to hear about another happy
htened...
>
>
> Cheers!
>
> Mark Durenberger
>
> -Original Message-
> From: neilkaz
> Sent: Tuesday, August 18, 2015 8:41 PM
> To: Mailing list for the International Radio Club of America ; 'NRC'
> Cc: a...@nrcdxas.org
> Subject: Re: [IRCA] DKAZ An
Thanks Mark and Nick for getting back to me with really valuable help.
Despite appearances I really would like to make this as simple as possible.
My thought was that in Mark's document it is noted that the null pot works
best at the antenna (your assessment of my thought on this was right, Mark),
Michael: What's the distance from the antenna midpoint to the shack?
Cheers!
Mark Durenberger mobile
-Original Message-
From: Michael Yule
Sent: Sunday, May 08, 2016 7:31 AM
To: irca@hard-core-dx.com
Subject: Re: [IRCA] DKAZ Construction
Thanks Mark and Nick for getting back
Not to worry Michael. It's made me think a little outside the box
myself, though having ideas and putting them into practice seem to be
two different things.
I feel that the FLG-100 should be at the antenna for best results, no
argument. Although Wellbrook suggests a maximum of 100 meter
fe
Thanks again Nick and Mark for your input and help - Mark, I haven't
measured an exact distance from the shack to the midpoint of the antenna but
I think that it's going to be about 200 feet to the house and then I have to
terminate in the second floor shack - the plan is to go up the side of the
h
It sounds to me like you are on the right track there Michael. As
for Maple Leaf, I've gotten a number of long above ground
RG-58 cable assemblies from them over the last couple of years, and
it's good cable by my standards, easy to work with (important for
DXpeditions), and fairly priced.
I very strongly recommend the Wellbrook FLG100LN, They go right at the
antenna and replace your xfmr. Now what is picked up by the antenna is
amped 22 dB whereas what is picked up by the coax is not amped at all.
I have two of these and they've survived IL weather for over 3 years. 73
KAZ Barring
Get the Wellbrook FLG 100 and put that HEAD Amp at the antenna - less noise!
Also consider a VACTROL for your antenna - details at DXer.ca
On Thu, Oct 6, 2016 at 2:29 PM, Mark Pettifor wrote:
> For those of you who have DKAZ antennas, which preamp do you use? Do you
> find it makes much differe
Agreed about a Vactrol to control and to be able to vary Rt (termination
resistance). My guess would be that 940 ohms is a bit high unless your
wires are quite thin. It is also very tedious and you can never be sure
when varying Rt manually. A Vactrol makes this job much easier and while a
differen
Agreed.They do cost a fair amount (mind you the exchange rate
with the pound isn't bad right now), but are solidly built and work
very well. Money well spent.
best wishes,
Nick
At 22:17 06-10-16, you wrote:
I very strongly recommend the Wellbrook FLG100LN, They go right at the
antenna
Thanks for the advice guys - much appreciated!
I should also publicly thank Tim Tromp for getting me interested in the
DKAZ to begin with. Some of his Perseus recordings on his YouTube
channel that were made with his DKAZ setup (or his phased BOGs, which I
haven't the room for) are amazing.
rsday, October 6, 2016 7:02 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] DKAZ questions
Agreed.They do cost a fair amount (mind you the exchange rate
with the pound isn't bad right now), but are solidly built and work
very well. Money well spent.
b
7:02 PM
> To: Mailing list for the International Radio Club of America
> Subject: Re: [IRCA] DKAZ questions
>
> Agreed.They do cost a fair amount (mind you the exchange rate
> with the pound isn't bad right now), but are solidly built and work
> very well. Money well spent.
nt of gain.
Chuck
From: IRCA on behalf of Nick
Hall-Patch
Sent: Thursday, October 6, 2016 7:02 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] DKAZ questions
Agreed.They do cost a fair amount (mind you the exchange rate
with the pound isn'
I do love the way the varied interests in this hobby are propagated through
this club from member to member and I'm grateful for the knowledge and
experience that's so freely shared.
One baby elephant in the room is Mark's antenna "ambience." If his QTH
there in the Land O' Goshen is in a fie
Thanks Mark. I do think that your points about twisted pair are
correct, and it would be intriguing to see if using twisted pair with
the FLG100 would make any further difference to the noise
pickup. My suspicion is not, but it's only a suspicion.One of
the things one seems to be paying
Unless one has some parts and wants to tinker, by far the easiest solution
is go with a FLG100 from Wellbrook and a Vactrol from Colin. Both plug and
play with cables and BNC connectors.
73 KAZ
On Fri, Oct 7, 2016 at 9:52 AM, Nick Hall-Patch wrote:
> Thanks Mark. I do think that your points a
One can use coax, with adequate grounds at both ends to mitigate stray
pickup, although I strongly suspect that there's a distance at which point
the other options might be better.
I should also note that good Cat5 cable is also not cheap in and of itself.
For the upcoming LBI DXpedition we'll co
that way.
But other times I use my FLG100, knowing you can't lose that way.
Chuck
From: IRCA on behalf of Neil Kazaross
Sent: Friday, October 7, 2016 8:25 AM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] DKAZ questions
Unles
Lots of useful info - thanks to all! I think it would also be useful to
tell you about my RF situation here in the Land of Goshen to get the
best advice.
1. I live less than two miles from 3 transmitters:
-- WCMR 1270 AM. They are 5kW day, 1kW night. Bearing: NNW
-- WFRN 104.7 FM. 50kW. Same s
eir except
when pointing the FM antennas that way I have set the attenuation on the ELAD.
Keith McGinnis
Hingham MA
- Original Message -
From: "Mark Pettifor"
To: "Mailing list for the International Radio Club of America"
Sent: Friday, October 7, 2016 12:20:04
Incidentally, for the DXpeditioner, the FLG100 will drive over 500
feet of coax, though not in the manufacturer's specs.
best wishes,
Nick
At 15:55 07-10-16, you wrote:
One can use coax, with adequate grounds at both ends to mitigate stray
pickup, although I strongly suspect that there's a di
t for the International Radio Club of America
Subject: Re: [IRCA] DKAZ questions
Thanks Mark. I do think that your points about twisted pair are
correct, and it would be intriguing to see if using twisted pair with
the FLG100 would make any further difference to the noise
pickup. My suspicion
The two FM's really shouldn't impact your AM DX, so your problems seem to
begin and end with WCMR and the radiated noise.
Russ Edmunds
15 mi NW Phila
Grid FN20id
AM: Modified Sony ICF2010's (4) barefoot w/whip
FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder;
Onkyo T-450RDS; Tecsun PL-310 ( 4)
If you're reayyy close to fm transmitters, as I am, it can affect
the SW band. I haven't done much AM DX here but haven't noticed the FMs
overloading into Am but haven't looked too closely
Paul
On Friday, October 7, 2016, Russ Edmunds wrote:
> The two FM's really shouldn't impact your A
AS many of you will know, I just put up a DKAZ about a month or so ago
pointing east. I'm in a bit of an enviable RF situation here, at 5kHz my
noise floor is about -125 - the closest AM station is 1kW 100 km from here
and I have only a 32kW ERP FM anywhere nearby (about 10 km). I'm on an acre
or s
A comment was made in this thread about boxes or enclosures for home brewed
DIY projects.
Last year I came upon this weatherproof model and have found the quality to
be very impressive for the price:
http://www.ebay.com/itm/1x-Waterproof-Plastic-Enclosure-Electronic-Project-Box-Instrument-Case-DIY
I think your wife and mine would be friends quickly. When I had my ham yagi
up on the roof I also had to paint the coax to match the shingles -- and
even the ground wire for the mast !
Russ Edmunds
15 mi NW Phila
Grid FN20id
AM: Modified Sony ICF2010's (4) barefoot w/whip
FM: Yamaha T-80 & T-85,
t;Mark Pettifor"
To: "Mailing list for the International Radio Club of America"
Sent: Friday, October 7, 2016 12:20:04 PM
Subject: Re: [IRCA] DKAZ questions
Lots of useful info - thanks to all! I think it would also be useful to
tell you about my RF situation here in the Land of G
Keith, wrote on Oct 7,
"I'm about 15 miles SSE of Boston. My situation with local stations, noise
and interference is somewhat interesting.
On MW I have WBZ and their 50kw blowtorch just to my NNE by about 4 miles
but other than that I'm in good shape. I have very little noise (my noise
floo
Agreed Andy. Looking forward to getting it soon.
To simplify my earlier post my current set up is as follows:
Receiver: ELAD SDR
Antennas: 50x100 Switched Termination Superloop running NE/SW and an ALA
1530S+
Phasers: I've tried 3 and all exhibit the same issue with WBZ.
Quantum Phaser, mini
I find it hard not hear WBZ underneath the null (phase) on a
number of frequencies
Please don't overlook the phasers Keith. The Quantum is a fine
phaser, but it is not meant to be baked by RF. I'd look at that
even before the Wellbrook amps.Years ago it was noticed that John
Bryant'
2 of the three phasers have active elements (Quantum and DX Engineering
NCC1) but all three have this issue but I will say that the Quantum is
probably most prone. Thinking back to when I first bought the Quantum
I was located about 5 miles south (9 miles from BZ) and the issue wasn't
as bad
of the coax and
> bring it inside. I then put 12:1 / 1:12 transformers at the ends of the 75
> ohm coax. Hardly any overload now. Jim
>
>
> Message: 2
> Date: Sat, 08 Oct 2016 03:37:48 +
> From: Nick Hall-Patch
> To: Mailing list for the International Radio Club of
I would like to install a couple of reversible DKAZ's (DKAZi?) and am wondering
what you all think about extending the two ends towards the middle using CAT5
and attaching them to a 4PDT relay. I would have a Patented Colin Newell
Vactrol and a balun at that point and run these back to the house
I am about to start construction of a 140' long and 22' high dkaz. I would
like to know how low the bottom wire can be above ground before performance
degradation starts. thanks Jim
___
IRCA mailing list
IRCA@hard-core-dx.com
http://montreal.kotalampi.co
Here's an updated data set on the DKAZ and Corner Fed Loop.
DKAZ
LENGTH .5 MHZ GAIN 1.5 MHZ GAIN.5 MHZ F/B
AND TERM1.5 MHZ F/B
AND TERMRDF .5 MHZ RDF 1.5 MHZ 3 DB WIDTH
(.5 and 1.5 MHZ) 6 DB WIDTH
(.5 and 1.5 MHZ)
100 -61.1 -34.6 35.1 (1150) 47
remoting the null with a potentiometer.
Cheers!
Mark Durenberger mobile
-Original Message-
From: michaeldy...@gmail.com
Sent: Saturday, May 07, 2016 6:02 PM
To: irca@hard-core-dx.com
Subject: [IRCA] DKAZ Construction Help Request
I would like to install a couple of reversible DKAZ
Hi Michael,
So... were you proposing the terminated end of the DKaz will actually
not be terminated until it reaches the Vactrol after a 70' length of
twisted pair? And the extension from the feedpoint end will also
simply be another 70' of twisted pair eventually terminated in a
balun (and
Sorry I am late to this thread and working on my own DKAZ's today reminded
me to reply here. While I won't be suggesting the cheapest idea I will be
suggesting the easiest and most simple method to have a very fine working
DKAZ.
1) Feed it with the FLG100LN amp directly at the antenna and use cabl
I use 2 ft. Others use 3 ft and also get great results. I tried 1 ft, and
F/B nulls degraded somewhat and even fine tuning the resistance (Rt)
results showed a least a couple dB less null. 73 KAZ
On Wed, Sep 19, 2018 at 10:31 AM, Jim B wrote:
> I am about to start construction of a 140' long an
I've posted Chuck's tabulated results at
http://www3.telus.net/public/shallpat/4all/DKAZ_and_flag_size_comparisons.pdf
Hate to think of the work he has put into this going to waste because
of the mail limitation. It's good information, and this has been a
really worthwhile discussion.
best
From: IRCA on behalf of Nick Hall-Patch
Sent: Thursday, October 25, 2018 3:37:26 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] DKAZ and Flag data
I've posted Chuck's tabulated results at
http://www3.telus.net/publi
39 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] DKAZ and Flag data
For Chuck and others, I found some years back that if I sent a draft to myself
first and then edited it and re-sent it, I could minimize that problem, but
it's more work than some may w
Thanks for running this Chuck and to Nick for making the results readable.
I’ll repeat a request I made a few days ago - any chance of adding a column for
1MHz?
My impression is that there is not a linear degradation in gain on the DKAZ but
that it falls off more rapidly below 700 or 800 kHz.
t: Re: [IRCA] DKAZ and Flag data
Thanks for running this Chuck and to Nick for making the results readable.
I’ll repeat a request I made a few days ago - any chance of adding a column for
1MHz?
My impression is that there is not a linear degradation in gain on the DKAZ but
that it falls off more ra
Thanks for reformatting and posting this, Nick! The 18 X 18 corner fed loop
looks better than I expected; I may try this with a FLG100LN in the limited
space I'll have at Cape Lookout in a few days.
73,
Guy Atkins
Puyallup, WA
___
IRCA mailing list
IRCA
--- Begin Message ---
Guy,
Here's hoping you have a great time at Cape Lookout and that current conditions
continue through your stay! I have two collapsible 20 ft. fiberglass fishing
poles. 18' x 18' Corner fed loop, hmmm.
Craig BarnesWheat Ridge, CO
On Thursday, October 25, 2018, 5:31:
am sick of running the
> simulations.
>
>
> Chuck
>
>
>
> From: IRCA on behalf of bill [his.com]
>
> Sent: Thursday, October 25, 2018 1:43 PM
> To: Mailing list for the International Radio Club of America
> Subject: Re: [IRCA
--- Begin Message ---
I concur: the PDF presentation of the data saved me time since I was about to
paste it into Excel, or rather its Open Office clone, here.
The 18 x 18 ft. corner fed loop (a.k.a. SuperLoop?) does look pretty good.
I've always had pretty good luck at the shore with a 6.6 x 6
I switched my FLG100LN feed xfmr amps and termination resistors from one end to
the other and now am going to aim easterly for a while. Most likely I will set
the phasing to steer the beam ENE across the upper half of the band for a
while, in search of a few Canadians I still need from IL and in
57 matches
Mail list logo
