WYSE's Ham Radio Site

Neil Klagge, Chief Operator

What is "600 meters"  ?

It is the 600 meter radio band which is located just below the bottom of the AM Radio Broadcast band. The frequency is 500 Kilohertz and a few kHz either side of that frequency. Several experimental ham radio licences have been issued for this band. It is hoped that all ham radio operators will be able to use it soon. Here is a link to the 500 kc website.

Update: At WRC12 in Geneva in February of 2012, a worldwide  allocation for amateur radio was reached which will hopefully open up 472-479 kHz for hams after January 2013 (as of December 2016 we are still waiting for this to happen in the USA). This new band will be called "630 meters". There are several countries that already have authorization on this band.

 

 

NEWS BULLETIN

THE FCC HAS ISSUED A REPORT AND ORDER COVERING 630M AND 2200M ON 3/30/2017

Here is a link to it..

https://apps.fcc.gov/edocs_public/attachmatch/FCC-17-33A1.docx

 

PLEASE NOTE: These two bands are NOT YET OPEN for amateur use. We have to wait until a special

Notification process is set up by the FCC and the UTC. Please do not transmit yet !!

Only Part 5  experimental stations and government stations are permitted at this time. 

 

 

 

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CURRENT UPDATES ON RECENT ACTIVITY ON 630 METERS CAN BE VIEWED ON JOHN LANGRIDGES WEBSITE AT

http://njdtechnologies.net/category/630-meters/

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        For my transmitters and antenna stuff for 630 meters.....

.................Go to my WG2XSV page.................

 

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My BEST receiving antenna for LF/MF

I have tried several resonant loops for 600m and the NDB band but none have worked as well as my E-field PA0RDTprobe antenna in terms of low noise and sensitivity. It must be mounted away from the house (and away from AC lines) and mounted at least 15 feet above ground. Some people have theirs elevated 50 feet but I would have too much intermodulation from nearby AM BCB stations. I currently have mine at 20 feet. You can find more about this "E-probe" antenna at http://yu1lm.qrpradio.com/pa0rdt%20whip.pdf

 

My modified version of the PA0RDT E-probe

 The 18" probe (above) attaches to an NE-2 neon bulb and a 10 uH inductor that seems to reduce some of the QRN. PA0RDT's circuit uses a J310 FET and a 2n5109 NPN, but I did not have these at the time so I used the MPF102 FET and the 2n2222 general purpose NPN instead.  My cirucuit does not have as much gain as the original circuit but it still outperforms the loops and inverted L that I was using prior to the E-Probe.

 

 

How I feed power to my PA0RDT probe antenna

In the following schematic, an RFC was not needed (it actually degraded the sensitivity of the antenna). There are other designs for power feed units as well.

7 pole Chebyshev BCB filter

This low pass filter has a cutoff near 510 KHz. It has some attenuation
when inserted (about 10 dB), but it knocks out 95% of the intermod signals from my receiver when I monitor the lower frequencies with the mini-whip (E-probe) antenna.

 

A Crystal Oscillator Circuit for MF

It was hard to find a circuit like this. I had to look in the section called FREQUENCY STANDARDS in an old ARRL handbook. 

 

 

Capacitive coupling to a 600m loop

Here is my method of coupling to my 600 meter loops:

Screen Captures on 600 meters

 

 

VX9BDQ captured on 18 January 2010, at 0354 UTC on my inverted-L (see my Antenna page) extended to 153 feet. His frequency was 507.55 kHz but it appears as 700 Hz when my FT100d is in CW mode. Distance was 769 miles. A static crash can be seen to the right of the third character.

 

 { ARGO is a weak signal detection program. You can get free downloads of several of the weak signal programs at this website:  http://www.weaksignals.com/   }

 

 On the second screen shot you can see what John's signal looked like before my local QRN started. After the noise hit, I switched to my small loop  just outside of my basement shack window. Obviously it improved the signal-to-noise ratio.  

 

 

 

 

 

 

 

 

 Another capture of Johns signal on 24 January 2010 at 0630 UTC:

 

 

               a WSPR* capture of WE2XGR/6 in New York


*WSPR is a Weak Signal Propagation Reporting program by K1JT. You can download this program at his site at

http://physics.princeton.edu/pulsar/K1JT/wspr.html    

 

Another 600 meter web page by John Langridge, KB5NJD