472 Khz Transmitter 8 kHz 1 Watt EIRP (5 W on 472-479 kHz) Maximum transmitter output 1500 Watts 60 Meter (~197 ft) height limit AGL for both 2200 and 630 Meter antenna Available to General and higher, Added to the panel were a 5A DC meter to monitor drain current, a keying jack and a key shorting-switch for keydown testing, 630 m activity coordination and relevant discussions take place in the 600m yahoo group, ¡4-72 se renueva para conectar más cerca de los colombianos! ¿Necesitas información? We are Heavy and General Construction Laborers Local 472, a 7,000 member plus union in NJ, By comparing the images over a 8 day interval, it’s easy to see that the number of stations on 472 kHz 630 metre band is growing rapidly! The Mini-Kits 630m Band 472 to 479kHz Transverter can be used with any low power 80m Band 3, Tom WA4ILH Over the night of 14-15 April 2017, I decided to run WSPR on the 160 metre doublet at GB0SNB, It is a readily reproducible design that may be of interest to those looking for a transmitter capable of developing full ERP power output, If we have worked on radio and you would like a QSL card, contact me, The first script I wrote for the Velleman K8055 was to make a clock out of two moving-coil meters, It covers 42 cities, including Fayetteville, Wilmington, Jacksonville, Lumberton, and Pinehurst, One works fine on 630 meters without modification, though I did add some additional front end filtering to help keep strong medium wave broadcast siganls from being a problem, DEL TIPO POLIESTERE, Air Force photo by Airman 1st Class Emma Funderburk) The 18th Airborne Command and Control Squadron deactivated during a ceremony June 16, 2025, physics, Roger, G3XBM, provides a schematic for his transverter, Some older WSPR spots from 2013-Jan-20 at 23:00 GMT, when transmitting using the described Transmitter from below, zip, Sep 12, 2018 · What I need is a 472 KHz transmitter only kit, Jan 3, 2022 · I purchased two of the "455 kHz IF" versions of the Softrock Lite II, CW Transmitters There are a number of transmitter An online scrapbook full of half-baked projects and silly ideas, The 630-meter (or 600-meter) amateur radio band is a frequency band allocated by the International Telecommunication Union (ITU) to amateur radio operators, and it ranges from 472–479 kHz, or equivalently 625, Nov 1, 2025 · Area Code 472 is located in North Carolina, This is the third version I have built using the design on Roger's page, with all three performing pretty much as advertised, 472 - 479 Khz, Profile and Interactive Map for Area Code 472 in North Carolina - November, 2025 Mar 17, 2025 · Route 472 is an Express Route traveling between Rosemount Transit Station, Palomino Hills Park & Ride, Blackhawk Park & Ride, I-35W Lake St Station and Downtown Minneapolis, Generally speaking, the jurisdiction of a District Court includes felony criminal cases, civil cases with higher amounts of controversy, and family law matters, Apr 10, 2016 · 475kHz / 630m LF Project NotesThis article is a set of notes to contribute towards the club 475 kHz (or 630m) project, A design by Roger G3XBM, Feb 14, 2012 · JUMA TX500 is a digitally controlled CW transmitter for the 500 kHz amateur radio band (600 m), We proudly build heavy infrastructure projects like highways and bridges across twelve counties in Northern New Jersey, It is an An online scrapbook full of half-baked projects and silly ideas, S, Download the Demonstration Software, Here is my 472kHz 630m transverter, I am very short of time of late, but it is my intention to experiment with some EME operation this summer and winter, so I figured I had better start buying, Jun 26, 2025 · The 472nd ECS is a geographically separated unit assigned to the 319th Reconnaissance Wing at Grand Forks Air Force Base, North Dakota, SOSTITUITE POI CON TIPO IN POLIPROPILENE PWR OUT 14 WATTS A 14, The 472nd District Court handles civil, family law, and juvenile cases, Mar 26, 2013 · http://www, au/~dxt103/valves/807-472kc/ EME223-630M KIT Description: The complete high performance 472 to 479kHz ( 630m Band ) Transverter Kit makes it very easy to get onto the 630m band especially with weak signal digital modes, but being linear it will work with all modes including SSB if it is allowed in your country, Hot-Melt Glue, We are open in Kenmore Square, Boston, MA, uk/wiki/472_KHz_T Apr 17, 2017 · Practical (though inefficient) transmitting antennas can be constructed for the WRC-12 bands, the 630m (MF, starting at 472 kHz) and 2200m (LF, 136 kHz), More information and notes on the theory can be found here on the Electrically Small Antenna ERP page, The rest of us finally got access to these bands at the end of 2017, I already have two receivers so I only need a transmitter for the new 472 KHz band, The output from this amplifier is small (around 980mV unloaded, about 290mV into ), I also tried JT65A on 20 metres receiving and managed to hear a few stations: The software, WSJT, can Ordered a 144 MHz Anglian Transverter from Sam, G4DDK, as well as a DEM L144LNACK-2N low noise preamp for 144 MHz, This operation takes place around 475 kHz, below the AM band, au/~dxt103/valves/807-472kc/ 472 kHz 479 kHz 5 W EIRP maximum, except in Alaska within 496 miles of Russia where the power limit is 1 W EIRP, 6AG7/807 transmitter for 472 kHz by VK1SV https://people, JUMA , in Finland, offers the TX500, an extremely well engineered 60W Class D CW transmitter in kit form, 5mm Hole, edu, Creation date : 28/10/2012 @ 09:42 Last update : 08/09/2024 @ 17:44 Category : 472 kHz Projects Page read 25427 times Jan 10, 2016 · At the SNBCG operating site we have the opportunity to out up some large antenna, and for some time we had wanted to try 472 KHz using George M1GEO WSPR transmitter, 8 kHz band can run up to 1 W EIRP, The calculator can be found here: LF/MF ERP Calculator, Few images of me taking the thing apart and setting stuff up, 02 on 01 September 2011, The transmitter is available as a component kit which inludes all the electrical and mechanical componets, We started experimenting with 472 kHz as soon as the band was available having just missed out on 500 kHz NoVs, 80 meters in at 5 watts will put out 5 watts from 472 – 479 KHZ, Register Your Location To use the 630 meter band, you must first This page is closely based on the method described on the GB3VHF website, referenced here, The image below is of a series of JT-65B receptions made via WSJT 9, 1x 3, You may find the Tait T800 Windows programming software useful: Tait_PGM800Win_V431_Setup, So far, there is a simple bandpass filter but more details will follow soon, Dave M0TAZ also operated on 40 metres over night, The band is available on a secondary basis in all ITU The transmitter used for the initial tests was built in a rush (before discovering that the old IC706 can be used as an exciter for 472 kHz): (photo of the 472 kHz transmitter prototype, with variable crystal oscillator) 472 kHz Antenna EIRP Calculator I started writing an ERP calculator for low and medium frequency, though it would cover any electrically short antenna, I had used the meters for a similar project with a PIC MCU and ADC, ELENCO BLOCCHI EME223-630M KIT Description: The complete high performance 472 to 479kHz ( 630m Band ) Transverter Kit makes it very easy to get onto the 630m band especially with weak signal digital modes, but being linear it will work with all modes including SSB if it is allowed in your country, Construction takes around 6 hours to fully built and test, Computer Aided Radar Performance Evaluation Toolkit, Homepage van Maarten Ouwehand PG1NHambrew Links VLF Projects Background Information Pre-Amplifiers Receivers Antennas 136 kHz Projects Pre-Amplifiers Receivers Transceivers Transmitters Amplifiers Antennas 472 kHz Projects Pre-Amplifiers Receivers Transceivers Transmitters Amplifiers Antennas 500 kHz Projects Receivers Transceivers Transmitters Amplifiers Antennas Multiband HF Projects Pre Hams operating on 472-479 kHz are permitted a maximum equivalent isotropically radiated power (EIRP) of 5 W, with a reduced limit in Alaska, Will work with any radio that can be turned down to 5 watts on 80 meter band, This software may be used to evaluate and observe the performance of Radar systems, This item is in the category “Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Transceivers”, Here are my initial thoughts, including some back of the envelope calculations, for a practical antenna for 630m, I have built a valve transmitter for 472 kHz , JUMA TX500 is using ultra high efficiency CMCD amplifier (Current Mode Class D) topology in the final RF amplifier, If you look on my 472 kHz page you can see some of our other projects, Oct 26, 2016 · The Monitor Sensors 630m Transverter enables any Amateur Radio Station, equipped with a conventional HF transceiver, immediate, all mode, access to the new 472-479 kHz, 630m band, uk/wiki/472_KHz_T Practical (though inefficient) transmitting antennas can be constructed for the WRC-12 bands, the 630m (MF, starting at 472 kHz) and 2200m (LF, 136 kHz), Antenna No commercial radio amateur gear currently supports 472 kHz for transmitting, so a transmitter has to be built from scratch, Feb 10, 2019 · A video (made at the old QTH) showing my 472kHz transverter on WSPR, The map of both transmitted and received signals was reasonably interesting: We received 18 unique spots and was spotted by 47 unique stations, John and the 630 crew have been testing the waters on these bands for years using an experimental license, John Langridge KB5NJD is one of the major players in the ‘new-to-hams’ 630-meter band, Since the project potentially includes the design and build of transmitters, receivers and antenna systems members are encouraged to contribute ideas and information to this article and spawn different articles as necessary, co, anu, Introduction Operating on 630 metres (472 – 479 kHz) is not something most hams would contemplate – in fact I am sure there are many who don’t know anything about this interesting ham band! There are in fact 630 m operators in many countries around the world, and there is enough activity and good DX to be found if you are patient, I wanted to try that here, It was formally allocated to amateurs at the 2012 World Radiocommunication Conference (WRC-12), There are a couple of 630m transmitters available on the commercial market that I know of, NELLA FOTO SI VEDONO LE CAPACITA' DEL P, An online scrapbook full of half-baked projects and silly ideas, Our best DX was into the United States, I am also building a DC receiver, You may have heard some bits and pieces about operating here over the past year, or two, Our 472 KHz 630 metre preamp is based on G3YXM’s design from The RSGB’s LF Today book, At the minute I am using a DDS60 by AmQRP, More information can be found on my 472 KHz WSPR pages: http://www, John Langridge KB5NJD recently visited the South Canadian Amateur Radio Society's (SCARS) monthly club meeting and set the record straight on 630 M, The software here is a demonstration edition, but is enough to have a play about with, DESUNTO IN PARTE DAL WEB E DA MIEI SPUNTI IL TRANSVERTER IN QUESTIONE SI BASA SU UNA CLASSICA MISCELAZIONE DI SEGNALI, IN QUESTO CASO CON UN "RISULTATO" A SCENDERE, UTILIZZANDO UN MIXER PASSIVO TIPO SBL-1 , I selected to build a transmitter using valves, Area codes 910 and 472 are telephone area codes in the North American Numbering Plan (NANP) for southeastern North Carolina, Any An online scrapbook full of half-baked projects and silly ideas, A, 1 meters wavelength, This page is a draft page, We adapted it slightly to better suit 472 kHz (630m) from 501 kHz (600m) among other slight changes, Lowdown 630-Meter Band Amateur Radio Antenna 630 Meter for Amateur Radio Operators such as HAMs The output waveform at 472 kHz exhibits slightly flat-topped sine waves, which is acceptable at the driver stage since the Class-E power amplifier will significantly distort the signal and necessitate further cleaning, Penal Code § 472 PC makes it a crime to forge, counterfeit, or possess a fraudulent public seal or emblem (to create a fake document that appears official or endorsed by a government agency), The area codes form an overlay for a numbering plan area (NPA) that includes the cities of Wilmington, Jacksonville, Laurinburg, Lumberton and Fayetteville, 7 to 137, Jan 10, 2016 · At the SNBCG operating site we have the opportunity to out up some large antenna, and for some time we had wanted to try 472 KHz using George M1GEO WSPR transmitter, 3x 9mm UPVC Pads, Received Power Target Detection Probably Coverage Map Atmospheric Losses An online scrapbook full of half-baked projects and silly ideas, ANCORA UN PROGETTO PER LA BANDA DEI 630 Mtr, The schematic I built is here, While 630 m is predominantly a home-brewer’s band May 15, 2018 · With a little bit of tinkering, we had a resonant antenna on 472 KHz We left the transmitter running overnight from JO01DQ with the call GB0SNB, and was delighted to see a number of reports all around Europe, I see a few "transceiver kits" on the web, uk/wiki/472_KHz_WSPR and here http://www, 8 kHz 1 Watt EIRP (5 W on 472-479 kHz) Maximum transmitter output 1500 Watts 60 Meter (~197 ft) height limit AGL for both 2200 and 630 Meter antenna Available to General and higher ¡4-72 se renueva para conectar más cerca de los colombianos! ¿Necesitas información? We are Heavy and General Construction Laborers Local 472, a 7,000 member plus union in NJ, The more powerful ones can be heard for several hundred kilometres, even during the day, Brand new open box transverter, Nov 12, 2018 · Nice to see this chunk of the Medium Wave band being made available to Amateur Radio users, In 2013, this is considered an odd decision, Amateurs operating in the 135, uk/radio/472_khz/472_khz_transmitter/ 6AG7/807 transmitter for 472 kHz door VK1SV https://people, This project was part of an effort to demonstrate that ham operation using practical rigs and suburban antennas would work on this band, Apr 17, 2019 · Antennas for the 630m (472 kHz) band The amateur 630m band has some great propagation characteristics, Cafe 472 specializes in serving delicious pizza, sandwiches, salads and frozen yogurts, This describes a ham radio 630 meter (475 KHz) home brew beacon transmitter and antenna matching system, (U, I am also building a simple, non-linear, transmit converter, For example, 472 Khz was allocated to Kuwait Radio 9KK and 476 Khz to Aden Radio 7OA, Creation date : 23/09/2018 @ 15:30 Last update : 08/09/2024 @ 17:42 Category : 472 kHz Projects Page read 9477 times An online scrapbook full of half-baked projects and silly ideas, WD8DAS 630-Meter Band Operations Steve WD8DAS operated Experimental Station WH2XHY in the 630-meter band (472-479 kHz), The two scripts are available here: K8055 Clock & CPU/RAM script Here, the clock shows 7:46 OSCILLATORE VARIABILE 472-479 KHZ & P, This page shows my QSL card, 5 VCC IL REVEX W520 A TALI FREQUENZE SI COMPORTA ANCORA CON UNA BUONA FEDELTA' SINO A CIRCA An online scrapbook full of half-baked projects and silly ideas, One could build a much more efficient (and less dangerous) transmitter using FETs in Class-D or E, It uses an Arduino with an Si5351 chip to produce WSPR beacon signals, 7-137, george-smart, It also covers 14 counties, including Scotland County, Richmond County, Robeson County, New Hanover County, and Cumberland County, Nov 22, 2014 · If you're thinking about getting something going for our new 630m band, the following web resources may be of help to you, Sep 19, 2014 · I was finally able to put the finishing touches on the new GW3UEP Class-E transmitter by mounting the hardware on a small 19" panel, 472 kHz Transmitter Exciter The exciter board is based on my Arduino WSPR exciter, Until very recently, 1999 - 2000, these frequencies were being used by Coast Stations around the world to transmit CW traffic to ships at sea, mainly in coastal waters up to a few hundred miles away, I am not entirely sure of what all the figures mean here, but the CW reception over the same period was 579, Oct 8, 2016 · Dave, GØRMF, long time LF proponent and ardent home-brewer has recently posted construction details of his new 630m transmitter, The transceiver was the Icom IC7100 with a transmit power of 3W, I also threw in the ability to monitor system resources on the two meters: CPU usage and Memory, Board 3" x 6", 472 kHz Transverter This page documents the building of G3XBM’s 472 kHz transverter by G8OCV and myself, uk/wiki/472_kHz_TransverterA short video of my 472 kHz transverter based on G3XBMs design with reception clips and reports from Da Nov 12, 2018 · This slice of the spectrum is below the AM radio band at 472 kHz, From Dave's description: This amplifier is based on the ‘300W Class D Transmitter for 136kHz’ published by the RSGB in WB5OYP FCC Rules for 2200 Meter band: 135, 8 kHz 1 Watt EIRP (5 W on 472-479 kHz) Maximum transmitter output 1500 Watts 60 Meter (~197 ft) height limit AGL for both 2200 and 630 Meter antenna Available to General and higher Jan 10, 2016 · At the SNBCG operating site we have the opportunity to out up some large antenna, and for some time we had wanted to try 472 KHz using George M1GEO WSPR transmitter, You can get a sample of that by checking the daytime range of broadcast stations below about 700 or 800 kHz, 9–635, 6MHz Transceiver to easily get onto the 630m band, I do plan to create a better stand-alone board soon, with one of these Chinese DDS modules that are cheap and easy to get from eBay, Standard QSL card (2019 onwards) 472 kHz Transmitter door M1GEO https://www, Modification of the front end and oscillator is necessary for 2200 meters,