Re: [IRCA] [mwdx] New logging

[Chuck Hutton <charlesh3@xxxxxxx>]

I don't use carbon film resistors on outdoor antennas as they are not as robust as carbon or metal composition resistors.


See http://w8ji.com/beverages.htm and scroll down to the section about what type resistor to use.

In addition, it's good to have a totally non-inductive resistor.

Were it my choice, I'd have used : https://www.dxengineering.com/parts/dxe-ecm-r470-2

Chuck



________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Mark4@xxxxxxxxxxxxxxx <Mark4@xxxxxxxxxxxxxxx>
Sent: Sunday, February 5, 2017 1:43 PM
To: Mailing list for the International Radio Club of America; Charles Rippel
Cc: Gilles Letourneau; Ralph Brandi; amfmtvdx@xxxxxxxxxxxxxxx; mwdx@xxxxxxxxxxxxxxxx; Tom Stiles; David & Victoria Morgan; Todd Emslie; am@xxxxxxxxxxx; Dave Valko; Mailing list for the International Radio Club of America
Subject: Re: [IRCA] [mwdx] New logging

Nicely done, Chuck and replacing that pot with a fixed resistor is a nice
touch!

(Just scored my own 24-count canvas bag of those military poles!)


Mark Durenberger

-----Original Message-----
From: Guy Atkins
Sent: Sunday, February 05, 2017 3:01 PM
To: Charles Rippel
Cc: Gilles Letourneau ; Ralph Brandi ; amfmtvdx@xxxxxxxxxxxxxxx ;
mwdx@xxxxxxxxxxxxxxxx ; Todd Emslie ; Mailing list for the International
Radio Club of America ; am@xxxxxxxxxxx ; Dave Valko ; David & Victoria
Morgan ; Tom Stiles
Subject: Re: [IRCA] [mwdx] New logging

Love it! A deceptively simple antenna, Chuck, but it works great. Flag
variations are so versatile. I hope you catch some good WCNA DX with it!

73, Guy


On Feb 5, 2017 7:13 AM, "Charles Rippel" <lantareamon@xxxxxxxxx> wrote:

> Hi all,
>
> Been working on a Superloop MW antenna which I can manually slew.  It's
> been a project for the past couple weekends (building/staining the wooden
> supports, mainly) and completed it yesterday, the 4th.  Its dimensions are
> 36 X 16' and is constructed so that I can physically move one end of the
> antenna to have the array favor NW, S or heading of choice.  The antenna
> is
> fed with 75 ohm RG-6 quad shield bought at the Home Depot for $43 / 500'
> and a packet of quad-shield "F connectors.
>
> http://www.homedepot.com/p/Southwire-500-ft-Black-RG6U-
> Quad-Shield-Coaxial-Cable-56918445/202316309
>
> Instead of installing a fixed value resistor in one corner, I went one
> step further and for the purpose of tuning the null, built a fixture which
> holds a 2K, non-inductive variable resistor to take the place of the fixed
> resistor network.  The variable resistor can be adjusted for the best
> null,
> removed, then the value read with a DVM which provides a value for a
> fixed,
> more easily weatherproofed, CARBON FILM resistor network to be inserted in
> place of the variable resistor.  With the loop "looking" generally west, I
> used a C-Crane Skywave, which had been modified by removing the internal
> ferrite bar and an external MW antenna input added   Tuned the radio to
> WCBS 880, about 300 miles up the coast, then connected the Skywave radio
> to
> the loop feed-point with a cable long enough to reach back to the tuning
> resistor end of the loop.  Adjusted the variable pot for the best null of
> WCBS which is generally off the back of the antenna  The adjustments took
> place at approximately 3PM; both the station and my location were still
> in daylight.
>
> Frankly, I was amazed at the results.  By adjusting the resistor, (the
> final value was 371 ohms) the loop would nearly completely null WCBS which
> gave way to a station with a latin format on the frequency.  In winter,
> WCBS can be heard here on a 24/7 basis at approximately the "S-9" level.
>
> I detuned everything, grabbed my iPhone, went through the process a second
> time and recorded a short video, linked below.
>
> https://youtu.be/ugLKjTuncsw
[https://i.ytimg.com/vi/ugLKjTuncsw/maxresdefault.jpg]<https://youtu.be/ugLKjTuncsw>

SuperLoop MW Antenna<https://youtu.be/ugLKjTuncsw>
youtu.be
Construction and tuning of 37' X 16' Superloop Antenna. A 0 - 2K, non-metallic variable resistor was adjusted for the best null off the rear of the Antenna. ...



>
> Next step is to review Mark Durenberger's, "Field Information on the
> Double D-Kaz Antenna" which has details on moving the nulling pot inside
> along with a couple articles on suppressing common mode pickup.  Who
> knows,
> I have 2 supports; this may turn into a D-KAZ v/s the Superloop.  It also
> comes apart and is compact enough to go in the back of a pickup for a trip
> to False Cape State Park, south of Virginia Beach, VA for some seaside
> magic.
>
> Chuck Rippel
> Chesapeake, VA
>
> On Thu, Feb 2, 2017 at 2:01 AM, 'Steve Francis' via MWDX <
> mwdx@xxxxxxxxxxxxxxxx> wrote:
>
>> 1290  WNBN  Meridian MS
>>
>> 1-31  0059 EST
>>
>> Good with spots for Tax Time Check Cashing and Ted's Alternator and
>> Starter, including locations and phone numbers; into old school R&B tune
>> by
>> Candi Staton.  No ID heard - long live local ads!
>>
>> Steve Francis
>> Alcoa, Tennessee
>>
>> Realistic TRF
>> Select-a-tenna
>>
>> --
>>
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>>
>
>
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