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 <[email protected]> on behalf of [email protected] <[email protected]> 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; [email protected]; [email protected]; Tom Stiles; David & Victoria Morgan; Todd Emslie; [email protected]; 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 ; [email protected] ; [email protected] ; Todd Emslie ; Mailing list for the International Radio Club of America ; [email protected] ; 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" <[email protected]> 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 < > [email protected]> 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 >> >> -- >> >> --- >> You received this message because you are subscribed to the Google Groups >> "MWDX" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. 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