Re: [IRCA] Western Superloop--Initial Trials

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

This goes back to the question of a matching transformer. If you use one at
the antenna, then using the DXE preamp should be fine. That's what we've
used at LBI.

Russ Edmunds
15 mi NW Phila
Grid FN20id
<wb2bjh@xxxxxxxxx>

AM: Modified Sony ICF2010's (2) barefoot w/whip
FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder;
Onkyo T-450RDS; Tecsun PL-310 ( 2);
modified Sony ICF2010 w/APS9B @ 15';
Grundig G8 w/whip; modified Sony ICF2010 w/whip


On Thu, Jul 2, 2015 at 12:13 PM, Chuck Hutton <charlesh3@xxxxxxx> wrote:

> But that's a 50 Ohm preamp and not really well suited for a 1000 Ohm
> antenna like a flag-superloop-delta.
> Chuck
>
> > Date: Thu, 2 Jul 2015 08:01:15 -0700
> > From: billblock@xxxxxxxxxxxx
> > To: irca@xxxxxxxxxxxxxxxx
> > Subject: Re: [IRCA] Western Superloop--Initial Trials
> >
> > Less, I have DX Engineering preamp and I have tested it at the antenna
> and
> > inside and I found no difference so my preamp will stay in the house.
> >
> > Bill Block
> > Prescott Valley, AZ
> >
> > On Thu, Jul 2, 2015 at 3:36 AM, Russ Edmunds <wb2bjh@xxxxxxxxx> wrote:
> >
> > > I don't see any real benefit to mounting the preamp at the antenna.
> We've
> > > had good success running them just inside
> > > the building on the LBI DXpeditions from a variety of broadband loops.
> > >
> > > Tuning is done by varying the resistance, either via substitution or a
> > > variable resistor. Mostly that's by ear and signal meter.
> > >
> > > Russ Edmunds
> > > 15 mi NW Phila
> > > Grid FN20id
> > > <wb2bjh@xxxxxxxxx>
> > >
> > > AM: Modified Sony ICF2010's (2) barefoot w/whip
> > > FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder;
> > > Onkyo T-450RDS; Tecsun PL-310 ( 2);
> > > modified Sony ICF2010 w/APS9B @ 15';
> > > Grundig G8 w/whip; modified Sony ICF2010 w/whip
> > >
> > >
> > > On Thu, Jul 2, 2015 at 1:51 AM, Les Rayburn <les@xxxxxxxxxxxxxxxx>
> wrote:
> > >
> > > > Finally found time to erect a Western facing Superloop. It's 24 X
> 7'. I'm
> > > > using a fixed 900 ohm termination, and feeding it with quad-shield
> RG-6
> > > > coax. I installed three snap-on ferrite cores near on the feedline
> near
> > > the
> > > > antenna, and then again at about 40 feet down the coax, three more
> just
> > > > before it enters the shack. Total coax run is about 90 feet.
> > > >
> > > > The antenna is quiet, very quiet--but signals levels are too low. I
> plan
> > > > to add a DX Engineering Receive Preamplifier DXE-RPA-1 when my budget
> > > will
> > > > allow. I'm going to send 12 VDC down the cable, and mount the
> pre-amp in
> > > a
> > > > weatherprooof box near the antenna.
> > > >
> > > > http://www.dxengineering.com/parts/dxe-rpa-1
> > > >
> > > > In terms of performance, I'm not sure what to expect. I tried a few
> > > > stations that were due East of me, such as WSB 750 in Atlanta. It was
> > > > weaker than on my other antennas, but not remarkably so. Listened
> for a
> > > few
> > > > of the Western powerhouse like KOA 850 in Denver, but nothing heard.
> Not
> > > > surprising, since KOA only appears a few times each winter.
> > > >
> > > > I have a variable resistance unit as well that I can substitute for
> the
> > > > fixed termination. It's range is 900 to 1400 ohms. But then I'll
> have to
> > > > figure out how to adjust the null from across the back yard. I
> thought
> > > > about feeding the receiver audio into an FM transmitter and listening
> > > > outside on a portable. That might be my best option.
> > > >
> > > > Can't seem to find much online about how to tune these things or
> gauge
> > > > performance. How does one know if it's working correctly?
> > > >
> > > > Advice or suggestions most welcome!
> > > >
> > > >
> > > > --
> > > > 73,
> > > >
> > > >
> > > > Les Rayburn, N1LF
> > > > Maylene, AL
> > > > EM63
> > > >
> > > > Member WTFDA, NRC, IRCA, & Medium Wave DX Circle
> > > > Former CPC Chairman for NRC/IRCA
> > > >
> > > > ============================== FM DX
> > > >
> > > > Sony XDR-F1HD, Sangean HDT-1, Elad FDM-S2, AirSpy.
> > > > Denon TU-1500RD w/Ray Dees RDS Decoder,
> > > > FM6 Antenna with CM7777 Mast Pre-Amp, RG-11.
> > > >
> > > > "Nothing but blues and Elvis and somebody else's
> > > > favorite song..."
> > > >
> > > > AM DX
> > > > Elad FDM-S2, Wellbrook ALA1530+ Loop, Clifton Labs Active
> > > > Whip, Superloop. Quantum Phaser, Kiwa Loop, Palstar MW Pre-Selector
> > > >
> > > > _______________________________________________
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