NJDTechnologies

Radio: it's not just a hobby, it's a way of life

Current Operating Frequency and Mode

OFF AIR

Links

Below you will find a number of parent links to pages that contain content that I reference in my musing.  If you find a link that is dead or find one that I have failed to include, please let me know.  This is a work in progress and I am sure I am leaving out valuable content as I start out.  Last updated March 20, 2017.

https://wg2xka.wordpress.com/  John Molnar’s page is a great overview of his pursuit to get an effective station on the air and is quite informative.  John is a skilled engineer and owner of MF Solutions and he brings a tremendous amount of wisdom to the table with regard to station building and operation.

http://no3m.net/  Eric Tichansky has what is likely the finest and largest receive installation on 630-meters in the world to date.  Eric’s page is an overview to his activities and I am certain that Eric would welcome any questions related to how he has accomplished so much in the low band world.

http://w0yse.webs.com/  Neil Klagge has a very nice 630-meter site that chronicles his path to putting a station on the air from not one but two locations in two very geographically diverse locations.  He has some very good information on the mathematics of determining ERP compliance for antenna systems.  Neil is a mathematician, so that helps a lot!

http://ve7sl.blogspot.ca/  I consider Steve McDonald to be the godfather of Canadian 630-meter activity.  He is heavily involved in maintaining his blog as an outreach tool, experimenting, and operating cross band on 630-meter to allow guys who might not be able to transmit on 630-meters to make QSO’s on our amazing band.  Steve also has another site that really started it all and its a vast treasure-trove of information.  It’s recently relocated content can be viewed here.

http://www.monitorsensors.com/ham-radio/630m-transverter  Roger, VK4YB, and an associate have developed a very nice, high-end full transverter (yes, transmit AND receive) for 630-meters that generates 50-watts and offers lots of safety features.

http://w5jgv.com/  Ralph Hartwell is the very loud signal on 630-meters from Louisiana as WD2XSH/7 and has some very good technical information that can be useful for setting up a station.  Ralph answered a lot of my questions initially about variometers and is also the webmaster for 500kc.com.

http://500kc.com/  The website of the ARRL’s 600-meter research group.

http://kl7l.com/  Laurence Howell is the 630-meter voice of Alaska.  Laurence has operated from some very inhospitable locations, including setting up receive systems that allow many of us to assess the path to these locations.  Laurence also has lots of experience in taking field measurements with portable equipment.

http://w7iuv.com/ Larry Molitor is a very skilled engineer that has made many significant contributions to weak signal processing in both the 630-meter and Topband communities.  He is a very strong elmer and you are best to listen to what he says because he is usually correct.

http://w1vd.com/  Jay Rusgrove is the owner of ARR (AR squared), and is a master engineer and builder.  If you build something to Jay’s specs, it will be very over-engineered, meaning that you will have to try hard to break it.  Jay is active on many LF bands with a number of licenses.

http://www.antennasbyn6lf.com/ Rudy Severns has done some amazing antenna system analysis as well as been an active author for QEX.  Rudy operates on 630-meters as WD2XSH/20.

http://w1tag.com/  John Andrews, like many of the other usual suspects,  is a very strong  engineer that has done a lot of work evaluating digital modes for worthiness on  MF and LF as well as evaluating and developing a number of techniques and hardware that will be useful to the low band operator.

https://www.youtube.com/user/WA3TTS1 Mike Sapp is a meticulous receive station for MF and LF stations and an excellent videographer.

http://www.wd8das.net/  Steve Johnston is an RF man professionally, working in the broadcast industry and very active as an AM operator on the low bands.  Its Steve’s aim to make make MF and LF available to the regular ham.

http://www.n3cxv.com/   Bill Borland is a relative newcomer to 630-meters as Part-5 station WH2XRR.  Bill has a very nice salt water take off location from the Potomac River.  Watch this guy on the transatlantic path!

https://sites.google.com/site/g3xbmqrp3/  Roger Lapthorn has a very informative site and  designed the first transmit downconverter that I used at WG2XIQ.  Roger has also done some very serious work with earth electrode antennas.

http://www.gw3uep.ukfsn.org/  Rog (I don’t know his last name – he is a superstar like “Prince”!) was the guy who designed and published the very simple 100-watt amp and VFO that I use at WG2XIQ.  Without Rog, WG2XIQ would not be the station that it is today.  Rog’s site is a very important site to hit!

http://people.physics.anu.edu.au/~dxt103/   Dimitrios Tsifakis is a very important player in the Oceania MF and LF scene.  He has a very nice antenna system calculator.

http://www.users.on.net/~davroz/vk6di/argocaptures/argocaptures.html  David Isele has a very nice receive location just off the ocean and hears very well.  He heard me for the first WSPR2 signal on 630-meters in VK.  If stations are going to be heard from NA, David’s grabber will be what hears them.

http://www.scorpionantennas.com/  Ron Douglass is the very big signal from Arizona as WH2XND.  Ron also owns Scorpion antennas and his antenna coils are a work of art.  Pay attention to what Ron does.  He has a very bright future on 630-meters.

http://wsprnet.org/drupal/  The idling mode for many 630-meter stations.  Its basically a digital reverse beacon network on steroids and where you will find many of the active stations between QSO’s.

http://g4fre.blogspot.com/2013/10/building-477khz-loop.html  David Robinson is a British citizen that lived and worked in the Dallas area.  He encouraged W5LUA to apply for a grant in a collaborative effort.  Dave has since relocated back to England but shows that reception from an apartment is possible on 630-meters.

http://www.hard-core-dx.com/  Gary Breed’s K9AY loop.. this is a great RX antenna option if you can control the ground conditions.

http://myweb.tiscali.co.uk/wgtaylor/  Scopematch, a means of tuning an antenna system.

http://www.hanssummers.com/  Hans Summers offers an Arduino-based system for not a lot of money that generates a beacon signal on a number of bands including LF and MF.

http://s9tec.com/  My webmaster, Larry McFarland… check him out.. he is an excellent photographer and engineer!

http://solarham.net/  A great propagation aggregation site.

https://www.youtube.com/user/SpWxfx  Dr. Tamitha Skov – this sharp chick gives a space weather forecast that will give your local meteorologist a run for his or her money!  I think a lot of the information that she brings!

http://www.on4kst.com/index.php  Alain Stievanart hosts the logger/chat that we use to coordinate skeds and chat

http://apps.fcc.gov/ecfs/proceeding/view?name=15-99  What we have been waiting on for a long time – the NPRM for 630-meters.

http://jproc.ca/radiostor/cw500pt1.html  Some interesting stories of 500-kHz maritime radio.

http://www.dj0abr.de/index_english.html  a very good German amplifier option.

http://www.infotechcomms.co.uk/Understanding_LF_and_HF_propagation.pdf  A very good propagation reference

http://myplace.frontier.com/~k9la/NM7M_The_Big_Gun_s_Guide_to_Low-Band_Propagation.pdf  Dr. Bob Brown, NM7M, (SK) a friend to the low band operator and head of the Space Weather Center at UC Berkeley

http://k9la.us/  Carl Luetzelschwab is THE propagation guy and was elemered by Dr. Brown (above)

http://www.blitzortung.org/Webpages/index.php?lang=en&page_0=30  A great and reliable lightning map

http://www.qsl.net/w/wb5wpa//QWloop40m/  Jim Voll has done some very serious work with back yard-sized loops for 630-meters.  If you are looking for an option to fit in a small space, look at his info, contact him, and I guarantee you will find an option that can work for you.

http://www.gmrr.biz/  The business of Dr. Fritz Raab, the head of the ARRL’s 600-meter research group.

http://www.qsl.net/k1fz/bogantennanotes/  Receive antenna option – beverage-on-ground.

http://websdr.ewi.utwente.nl:8901/  a really cool remote receiver on the Internet.. There are many.  Its cool to listen to hams on 630-meters in Europe!

http://www.kitsandparts.com/index.php  A supplier of parts useful to the LF and MF op.

http://w8ji.com/  Tom Rauch is the engineer’s elmer.  A regular contributor on E-ham and the Topband reflector.  Listen to Tom.  He knows what he is talking about.

http://www.qsl.net/dl4yhf/spectra1.html  Spectrum lab software used with my grabber.

http://phasordesign.com/VE7CNFamateurRadio/ Toby, VE7CNF, has some fantastic information about 630-meters

http://www.strobbe.eu/on7yd/136ant/ Rik ON7RD – OR7T’s personal site that focuses on 137 kHz but is very applicable to 472 kHz.

http://www.472khz.org/ European-based site created by Rik ON7YD – OR7T

http://www.g0mrf.com/ Very informative page of David, G0MRF

http://6212.teacup.com/472khz/bbs Very excellent Japanese-language site devoted to 630-meters (Thanks Hideo, JH3XCU)

https://m0ukd.com/calculators/loaded-quarter-wave-antenna-inductance-calculator/   A very good link recommended by Roger, VK4YB, for making vertical antenna calculations