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Re: [IRCA] Split SuperLoop variant

This is what's fun about the empirical world.  I'll set this up as
planned.check F/B and then record while moving the separation from "0" to 3
feet, and let you know what I learn.

 

PostScript:  The wires do essentially "kiss" on the D-Kaz J

 

 

Cheers!

 

Mark Durenberger

 

From: Chuck Hutton [mailto:charlesh3@xxxxxxx] 
Sent: Wednesday, September 06, 2017 5:25 PM
To: Mark Durenberger
Subject: Re: [IRCA] Split SuperLoop variant

 

Interesting, but I:m not sure if it is a good idea or not.

 

Bad side: the two halves of the loop are not exactly in the same plane.

Good side: the wires never kiss in the middle.

 

Which is more important? Who knows?

 

Chuck

 

  _____  

From: Mark Durenberger <Mark4@xxxxxxxxxxxxxxx>
Sent: Wednesday, September 6, 2017 3:20 PM
To: 'Chuck Hutton'
Subject: RE: [IRCA] Split SuperLoop variant 

 

That's interesting.appreciate that input, OM

 

 

Cheers!

 

Mark Durenberger

 

From: Chuck Hutton [mailto:charlesh3@xxxxxxx] 
Sent: Wednesday, September 06, 2017 5:10 PM
To: Mark Durenberger
Subject: Re: [IRCA] Split SuperLoop variant

 

My EZNEC model (and KAZ's also I think) assumes their is no kissing of the
wires in the middle. I did this by making the upper left and lower right
junctions be half a foot in front of the upper right and lower left
junctions. 

I was trying to figure out KAZ's center mast arrangement to see how far
apart he kept the wires and how he did it.

 

Chuck

 

  _____  

From: Mark Durenberger <Mark4@xxxxxxxxxxxxxxx>
Sent: Wednesday, September 6, 2017 2:59 PM
To: 'Mailing list for the International Radio Club of America'; Hutton Chuck
Subject: RE: [IRCA] Split SuperLoop variant 

 

Dear "Lost:"

Are you possessive of wisdom that suggests the crossovers and center down
runs should be a certain distance apart...and kiss only momentarily at a
crossover point?


Cheers!

Mark Durenberger


-----Original Message-----
From: IRCA [mailto:irca-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Chuck Hutton
Sent: Wednesday, September 06, 2017 3:54 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] Split SuperLoop variant

Neil -


Not clear to me how the cable ties are done.

My masts have small eyelets that are not big enough for 2 cable ties. Yours
are big enough?

And if the cable ties are tight, wouldn't the wires be flat against the very
narrow top of the mast rather than being an inch or two apart?


Lost!


Chuck


________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Neil Kazaross
<neilkaz58@xxxxxxxxx>
Sent: Wednesday, September 6, 2017 8:58 AM
To: Mark Durenberger
Cc: am@xxxxxxxxxxx; CapeDX@xxxxxxxxxxxxxxx; Shafer Mike; Mark Connelly;
Baumgartner Fred-ARRL; irca@xxxxxxxxxxxxxxxx
Subject: Re: [IRCA] Split SuperLoop variant

My center down runs are perpendicular. I use the same type of windsock pole
with the small center ring at the top. Two large cable ties each create a
loop to run the two wires thru and when tight they are an inch or two apart
and come down the sides of the mast. Maybe something can be done in practice
to improve performance with down run spacing? But it models fine.

My only other experience with // down runs was when I built a Split Delta
Flag years ago and down runs were on each side of the supporting tree's
truck about 4 to 5" apart.

73 and GL ..KAZ

On Wed, Sep 6, 2017 at 10:34 AM, Mark Durenberger <Mark4@xxxxxxxxxxxxxxx>
wrote:

> It should be pretty square; the insulators at top/bottom of the center 
> pole are only about 2 inches long so the center "down runs" should 
> stay pretty perpendicular.  (Hmmmm.I wonder what happens if they're 
> completely
> perpendicular?)
>
>
>
> Conversion should be aided by the fact that the two end poles are 
> already in place, as the supports for the D-Kaz.  Hopefully it's a 
> matter of adding the center pole and restringing wires.  Of course 
> that's without the Murphy Factor <g>
>
>
>
>
>
> Cheers!
>
>
>
> Mark Durenberger
>
>
>
> *From:* Neil Kazaross [mailto:neilkaz58@xxxxxxxxx]
> *Sent:* Wednesday, September 06, 2017 10:15 AM
> *To:* Mark Durenberger
>
> *Cc:* am@xxxxxxxxxxx; irca@xxxxxxxxxxxxxxxx; CapeDX@xxxxxxxxxxxxxxx; 
> Shafer Mike; Baumgartner Fred-ARRL; Mark Connelly
> *Subject:* Re: [IRCA] Split SuperLoop variant
>
>
>
> The 140 x 20 DKAZ has about 3 dB more signal than the Double Flag with 35'
> loops.
>
>
>
> If you can replace that DKAZ with the Double Flag in less than an 
> hour, you're a much faster builder than I. Hopefully the Double Flag 
> or whatever we end up calling this antenna type (assuming it works 
> well) with also provide you with 30 dB F/B. Please be sure to 
> dimension it as closed to perfect as possible.
>
>
>
> 73 KAZ
>
>
>
> On Wed, Sep 6, 2017 at 9:39 AM, Mark Durenberger 
> <Mark4@xxxxxxxxxxxxxxx>
> wrote:
>
> Kaz, thanks for the info on expectations.  As to signal levels, is it 
> a fair test to compare the 35/35 rectangular loop to the 140 x 22 D-Kaz?
>
>
>
> The plan at the moment is to SDR-record, measuring daytime signals, 
> F/B and noise with the D-Kaz; then within the hour move to the Dualoop 
> and re-measure. With a large group of signals from all directions it 
> may also be possible to get some vague sense of the side-lobe performance.
>
>
>
> As a follow-on, it may be useful to compare the differential info on "sag"
> vs. "straight," using Mark C's precise catenary info.
>
>
>
>
>
> Cheers!
>
>
>
> Mark Durenberger
>
>
>
> *From:* Neil Kazaross [mailto:neilkaz58@xxxxxxxxx]
> *Sent:* Tuesday, September 05, 2017 9:26 PM
> *To:* Mark Mobile
> *Cc:* am@xxxxxxxxxxx; irca@xxxxxxxxxxxxxxxx; CapeDX@xxxxxxxxxxxxxxx; 
> Shafer Mike; Baumgartner Fred-ARRL; Mark Connelly
> *Subject:* Re: [IRCA] Split SuperLoop variant
>
>
>
> Good to see you working on these as well, Mark. To me the most 
> important goal is to see what is needed to achieve the same type of 30 
> dB F/B often available from the DKAZ. If that can be had, then two 
> things are good,
>
>
>
> 1) More signal (7 dB for same footprint using rectangular loops rather 
> than triangular) which will help those critical low end low signal 
> DU's on DKAZ and similar low band stations.
>
>
>
> 2) An acceptable antenna that can fit into an 80 ft or so space which 
> opens up Dual-Loop type antennas to DXers with less space.
>
>
>
> 73 KAZ
>
>
>
> On Tue, Sep 5, 2017 at 8:03 PM, Mark Mobile <Mark4@xxxxxxxxxxxxxxx> wrote:
>
> Hi Mark; you and I are traveling the same road again.  Later this week 
> I expect to field a dual-loop similar to yours in dimensions but I'll 
> add a middle support pole with an adjustable "height" so I can create 
> a sag of varying depths as well as keeping it a straight run.  The 
> goal is to see if the "sag" has any impact on performance versus 
> "no-sag."  (I suppose the next step would be to create an array that 
> was the same size as the 140-ft
> D-Kaz.)
>
> (I'll measure F/B to compare D-Kaz with Dualoop.)
>
> I hope we can compare notes.
>
> Attached is the draft plan; if it doesn't make it through the 
> reflector servers it can be found at:
>
> http://www.durenberger.com/documents/DUALOOP.pdf
>
>
>
> Cheers!
>
> Mark Durenberger, mobile
>
>
> -----Original Message----- From: Mark Connelly via IRCA
> Sent: Monday, September 04, 2017 11:38 PM
> To: neilkaz58@xxxxxxxxx ; am@xxxxxxxxxxx ; irca@xxxxxxxxxxxxxxxx ; 
> badx@xxxxxxxxxxxxxxx ; CapeDX@xxxxxxxxxxxxxxx
> Cc: Mark Connelly
> Subject: [IRCA] Split SuperLoop variant
>
> _______________________________________________
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>
> Opinions expressed in messages on this mailing list are those of the 
> original contributors and do not necessarily reflect the opinion of 
> the IRCA, its editors, publishing staff, or officers
>
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>
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>
>
> ---------- Forwarded message ----------
> From: Mark Connelly <markwa1ion@xxxxxxx>
> To: neilkaz58@xxxxxxxxx, am@xxxxxxxxxxx, irca@xxxxxxxxxxxxxxxx, 
> badx@xxxxxxxxxxxxxxx, CapeDX@xxxxxxxxxxxxxxx
> Cc:
> Bcc:
> Date: Tue, 5 Sep 2017 00:38:36 -0400
> Subject: Split SuperLoop variant
> The following is a variation on the Split SuperLoop design that I may 
> actually be able to install and test here soon.  I have attached a 
> drawing.  If it can't be accessed directly from the email, please see:
> http://www.qsl.net/wa1ion/pictures1/split_superloop_201709.gif
>
> This differs from the conventional layout in that it is designed for 
> two available supports (one on each side) so some allowance needs to 
> be made for droop in the center.
>
> Each top wire drops in height (referenced to base) from 8m / 26 ft. at 
> the side supports to approximately 6m / 20 ft. at the center.
>
> At the crossing point of the near-center drop wires, a wooden garden 
> stake cut to 0.4m / 16" with holes drilled 2" from each end (one for 
> each wire) is used to keep the wires separated.
>
> As in the notes on the drawing:
> Wire used = #14 AWG insulated stranded THHN from Home Depot.
> Height of bottom wires above ground is approximately 1m / 3.3 ft.
>
> Looking at the antenna drawing as I would actually view the antenna 
> from my back deck, the left (Side 1) is west and the right (Side 2) is 
> east, approximately.
>
> I am soliciting Neil (and/or others proficient in EZNEC) to model this 
> layout and see if it has merit for good F/B ratio and reasonable pest 
> reduction at bearings +/- 45 deg. off max null, e.g. at least 10 dB 
> down (relative to forward pick-up) at all bearings between southwest 
> and northwest if the main null axis is west.
>
> How finicky is termination resistance and would a high band station 
> need a different setting from a low band one on the same axis?
>
> If I do install the antenna, there will be several different stages of 
> testing.
>
> Stage 1:
> 9:1 transformer each side with speaker wire or CAT-5 runs back to 
> operating position.  Feedline lengths approximately 27m / 90 ft.
>
> 4PDT rotary switch sends one feedline to 500 ohm pot (in-shack 
> termination adjustment), other feedline to 2:1 transformer to coaxial 
> cable that either goes straight to the receiver or through a DX 
> Engineering RPA-1 amplifier (or similar) en route to the receiver.
>
> Switch can be reset to flip the connections of the two feedlines to 
> allow nulling in the opposite direction.
>
> Stage 2:
> The Stage 1 set-up except that common-mode choke boxes are inserted in 
> the feedlines a short distance (under 3m / 10 ft.) from connections to 
> each 9:1 transformer.
> Choke assemblies per page 1 of:
> https://www.okdxf.eu/lankford/Half%20Size%20Dual%20Active%
<https://www.okdxf.eu/lankford/Half%20Size%20Dual%20Active%25> 
> 20Delta%20Flag%20Arrays.pdf
> or similar.
>
> Stage 3:
> The east side of the antenna gets an at-antenna amp (Clifton Labs, 
> Wellbrook, or homebrew).  West side either stays with 9:1 transformer 
> / speaker wire / in-shack pot or goes over to a Vactrol (or motorized 
> pot) scheme.  This, of course, takes away the reversibility feature 
> and would only be retained if the Stage 1 and 2 set-ups did not 
> provide satisfactory results.
>
> The location where this will be installed has just had an upgraded TA 
> SuperLoop (width: 20m / 66 ft., height base-top: 9m / 30 ft., base 
> above ground 0.3m / 1 ft.) installed.  It is presently set up per the 
> Stage 1 connection method above so it is reversible.
>
> Day and night tests (Perseus spectrum captures) will be done with that 
> antenna first to establish performance baselines and then the Split 
> SuperLoop variant will be dropped into the same space using existing 
> support ropes into the adjacent black locust trees.
>
> Mark Connelly, WA1ION
> South Yarmouth, MA
>
>
>
>
>
> On Sun, Sep 3, 2017 at 9:44 PM, Neil Kazaross <neilkaz58@xxxxxxxxx> wrote:
>
> > My new Double Corner Fed Flag antenna is up but needs some more and 
> > very careful dimensioning I think. A huge willow tree isn't making this
easy..
> It
> > has more signal (EZNEC says 7 dB) than a DKAZ requiring the same 
> > space
> and
> > height since the two loops are rectangles rather than triangles and 
> > therefore have more area underneath them. However, I am not getting 
> > as
> good
> > F/B as I'd like or as I could get from the DKAZ, but it seems 
> > adequate
> for
> > sunrise work to the west.
> >
> > LSR here was 11:20 today so I started DXing just a few minutes prior 
> > to
> > 1100 in hopes of Tonga but little trace and bad slop from NM. Over 
> > to
> 1098
> > and V7AB had audio and did so much of the time til about 1131:30 
> > when it seemed it was cut. Music, mostly island mx and ancr in 
> > island lang at times. Bothered by slop from KKLL on early and even 
> > KEXS running day rig
> at
> > night clobbering KAAY 1090.
> >
> > I had weak audio at times from 4QR 612 and 2NR 738 but 702 was more 
> > interesting usually with 2BL which is just a bit low of 702 
> > sometimes audible but often mixed with NZ which is almost on 702 and 
> > had mx and a different ancr. NZ rose atop around 1125 for a bit. A 
> > third considerably weaker carrier is a bit above 702.
> >
> > My apologies for sending the again, but Gary hasn't learned to keep 
> > off
> the
> > keyboard.
> > http://www.universal-radio.com/catdir/cuscb333.html
> >
> > 73 KAZ Barrington IL Perseus and DCFF aimed west.
>
> > _______________________________________________
> > IRCA mailing list
> > IRCA@xxxxxxxxxxxxxxxx
> > http://montreal.kotalampi.com/mailman/listinfo/irca
>
>
>
>
>
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