80m ham radio band used for wideband video/data

80m ham radio band used for wideband video/data

Trials in the UK have used 3.613 MHz for 24 kHz bandwidth high-speed data and video transmissions

In recent years there has been increasing military interest in high-speed data on HF.

By using modern modulation techniques a SSB channel can support a raw data rate of 12800 bps and wider transmissions can support proportionally faster data rates. Trials have shown that color video at 15 frames per second can be streamed on HF in a bandwidth of just 18 kHz. That is the type of bandwidth that may be accommodated in the amateur radio 29 MHz band.

In the UK HF trials have taken place between Blandford and Portsmouth (Portsdown), and Arbroath and Portsmouth. They used frequencies, licensed by Ofcom, of 3.613, 6.390, 7.975 and 13.047 MHz with bandwidths up to 24 kHz and power up to 400 watts.
Information on these trials can be seen at
http://www.hfindustry.com/meetings_..._hfia/presentations/RC_WBHF_UK_Trial_2012.pdf

USA trials of video streaming over a 1320 km HF path
http://hfindustry.com/meetings_pres..._Rockwell_WBHF_High_Order_QAM_OTA_Results.pdf

Military Aerospace reports that short wave radio (HF) is being considered as an alternative to Satellite communications (SATCOM)
http://www.militaryaerospace.com/bl...s-nervous-about-satellite-communications.html


http://www.southgatearc.org/news/august2013/80m_ham_radio_band_used_for_wideband_video_data.htm

 

AH - Half Fast Scan TV.

Bil
K1ATV
Mesa AZ

 

Fast Scan is 30 frames per second. Half Fast Scan is 15 frames per second.

Bil
K1ATV HAM TV
Mesa AZ

 

Interesting! I remember there was a group of SSTV operators experimenting with NBTV on 10 meters a few decades ago, they were close to getting similar results I think, but impressive a video stream can be sent in such a small bandwidth
Good luck with it, I do not think they would allow it much on bands due to the width but 10 meters and down would be a good place for it IMHO Thanks for the interesting story, 73,Michelle

 

I knew it was too good to be true. The early days of radio the gov't/military left hams alone on HF figuring nothing above LF was worthwhile. Late 20th C to now has seen UHF and above used for cell phones and other industrial/military uses. Now this! Wonder how long it'll be before they start taking the HF bands away from us!! I hope after I'm long gone!
Vy 73...Joe

 

Funny, I thought hams were supposed to be on the cutting edge...

 

I say give them everything from 14.298-14.315 MHz. I can think of two places on the dial in between there where we'd be able to clean up the trash.

 

Nah...the "trash" would just move and dirty up other parts of 20 mtrs....

 

heh?

not the time or the place for this kind of info...politics on Africa?

 

Perhaps, but at least I wouldn't be run off an empty area of frequency that is alocated to all amateurs.

 

Its a genuine pity things are coming to this, the RSGB should step in and put a stop to that or at least redirect these scientists to other parts of the HF spectrum. The HAM bands should forever remain for
AMATEUR RADIO USE. Actually,, ALL OTHER amateur radio governing
bodies world wide should voice a strong opposing opinion against this
move and BLOCK this. It may be timely for all the real hams to start voicing
their opinion against this as well.
Thanks
zl4au

 

You do realize, don't you, that the frequency in question on 80m ham radio band is not authorized ONLY for Amateur Radio. In Region One where this took place, the Amateur Radio Service shares Primary status with both the FIXED and MOBILE radio services. The station was authorized to be there in full compliance with the rules. Heck, the same holds true for Region 3 which includes ZL-land.

In fact, with the exception of 3500-3750 kHz in Region 2, the entire 80m Amateur band is shared with other services all around the world.



73

Dave
K3DCW

 

The quote from Archbishop Tutu is all well and good, but what does the quote have to do with ham radio?

 

It looks like the military is looking to HF as back up in case satellites go bad for some reason.

It makes sense.

 

It makes allot of sense, considering the Chinese have already proven their ability to hack and attack our satellites. A back-up is certainly needed.