Author Topic: 2200 meters and 630 meters now open to amateurs in the USA  (Read 1199 times)

Offline Smurf Hunter

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2200 meters and 630 meters now open to amateurs in the USA
« on: March 31, 2017, 01:43:56 PM »
http://cqnewsroom.blogspot.com/2017/03/flash-fcc-approves-new-mflf-ham-bands.html

I don't know much about LF/MF.  On the surface these are limited to what we'd consider QRP on HF.
The bandwidth would be very narrow, so I'm unsure what modes would fit there.
Also the idea of an antenna sized to 1/2 wavelength seems close to impossible for a hobbyist to achieve.

Offline armymars

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #1 on: March 31, 2017, 05:55:11 PM »
  Part 15 use to allow 10 watts on 1650 meters. Most people on that frequency used a short verticals with large top hats. If you check out the 1929 ARRL hand book you'll see they use folded dipoles with 3 or more wires.   

Offline Alan Georges

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #2 on: March 31, 2017, 06:50:10 PM »
I'm guessing that these bands will be best for blanketing a small area with signal, and will essentially ignore interference from hills.  MW can do amazing stuff at night in winter, but it's hard to see how these permitted low power levels will be able to overcome distant lighting noise in the summer.

The one thing that looks really interesting is ground wave propagation over salt water.  WWL in New Orleans blankets the northern Gulf coast this way, even in the daytime.  (Here's a coverage map: http://radio-locator.com/cgi-bin/patg?id=WWL-AM)  It's "way up" at 345 meters (i.e., 0.870 MHz).  Admittedly WWL broadcasts at 50kw, but it it uses relatively inefficient amplitude modulation.  How will a narrowband data signal perform over salt water, down in these new bands?

Interesting ham geek stuff, but I'm not sure how relevant it will ultimately be to what we discuss here at TSP.  But who knows, maybe this'll spur a renaissance in loop antenna design or something, and we'll all end up with something practical.

I swear, there are times it seems like "Baofeng" is Cantonese for "hot mess."

Online Carl

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #3 on: April 01, 2017, 05:35:50 AM »
  I will wait till Baofeng produces the handy sized version with pocket antenna.
Stop complaining about life and start Celebrating it .

I've reached the age where there is little left to learn the hard way.

If you had only one year,one month,or one day...Would you live your life differently?

Offline Alan Georges

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #4 on: April 01, 2017, 07:30:04 AM »
  I will wait till Baofeng produces the handy sized version with pocket antenna.
They're waiting on Radio Shack to introduce one, so that they can cheaply clone the design.

I swear, there are times it seems like "Baofeng" is Cantonese for "hot mess."

Offline Smurf Hunter

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #5 on: April 01, 2017, 11:15:47 AM »
Maybe one of us should troll the next brush beater post on guerilla comms and suggest these bands ;)

Offline Alan Georges

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #6 on: September 16, 2017, 07:28:21 AM »
Coming to a shack near you, October 16th:
https://swling.com/blog/2017/09/fcc-opens-630220-meters-october-16-pre-registration-required/


Maybe one of us should troll the next brush beater post on guerilla comms and suggest these bands ;)
I'm staying out of that funhouse, but will look in the windows from time to time to see :wtf: they cook up.  Maybe a hardware mod to transmit on these bands with an FT-817?

I swear, there are times it seems like "Baofeng" is Cantonese for "hot mess."

Offline backwoods_engineer

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #7 on: September 19, 2017, 08:10:52 PM »
I just gave notice to the utility council that I intend to transmit on 472-478 kHz no less than 30 days from now.
We'll see if they object.

Offline Smurf Hunter

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #8 on: September 20, 2017, 08:02:26 AM »
I just gave notice to the utility council that I intend to transmit on 472-478 kHz no less than 30 days from now.
We'll see if they object.

I admire your pioneer spirit.

Offline Alan Georges

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #9 on: September 20, 2017, 06:17:48 PM »
It's going to be interesting to see what uses turn up for these bands.  I'm not diving in yet, but hats off to you BE.  Keep us posted on what turns up.

I swear, there are times it seems like "Baofeng" is Cantonese for "hot mess."

Offline backwoods_engineer

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Re: 2200 meters and 630 meters now open to amateurs in the USA
« Reply #10 on: September 25, 2017, 08:47:37 PM »
I'll start by listening.  My transceiver has a general coverage receiver that covers 472-479 kHz also.  I plan to build a Beverage receive antenna first.  (Good thing I'm buying some land soon).  There are some guys that plan to start transmitting soon on FT8 and JT65.

I'll have to build a power downconverter so I go down from (for example) 5.472 MHz to 0.472 MHz.  They say antenna efficiencies for reasonable heights on 630m are terrible, around 2%.