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855 Views 24 Replies 11 Participants Last post by  GSPHerder, 
GSPHerder
Are there any digital devices available to the public that compress and burst transmissions over Ham freqs?
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PSYOP Soldier
GSPHerder said:
Are there any digital devices available to the public that compress and burst transmissions over Ham freqs?
Click to expand...
Like FLDIGI ...

look into DMR

Can do all modes/ uhf/vhf/hf/analog/digi

\\NNNN
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GSPHerder
PSYOP Soldier said:
Like FLDIGI ...

look into DMR

Can do all modes/ uhf/vhf/hf/analog/digi

\\NNNN
Click to expand...

Ive, seen some of those, mostly ft8. Still reading and trying to sort if any of those compress's transmissions.

Thanks.
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HDCowboy
Like this.........

RIGblaster Plug & Play - West Mountain Radio

A RIGblaster Plug N Play is the easiest way to properly connect your radio to a computer so that you may operate using over 100 existing and future ham radio sound card software programs.
www.westmountainradio.com

or this.........


Just gonna take some studying to get started, here's a good book.......

www.amazon.com

ARRL's HF Digital Handbook: Steve Ford: 9780872591035: Amazon.com: Books

ARRL's HF Digital Handbook [Steve Ford] on Amazon.com. *FREE* shipping on qualifying offers. ARRL's HF Digital Handbook
www.amazon.com

...........or just search HF digital modes on Youtube or Google. This looks like it might be a good video to get started.......

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DKR
Use of frequency hopping, pseudorandom, spread spectrum communications is legal for hams.

Same stuff used (technology) used by the USAF for the F-117 some time back.

Don't know of any 'burst' type protocols available to the 'public'.

Anything that you use HAS TO BE, by Law, open source. If you are deliberately trying to encrypt your communications, understand the loss of your license will be the least of your legal troubles.
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GSPHerder
DKR said:
Use of frequency hopping, pseudorandom, spread spectrum communications is legal for hams.

Same stuff used (technology) used by the USAF for the F-117 some time back.

Don't know of any 'burst' type protocols available to the 'public'.

Anything that you use HAS TO BE, by Law, open source. If you are deliberately trying to encrypt your communications, understand the loss of your license will be the least of your legal troubles.
Click to expand...

Yes, I was anticipating that response, not encrypting just compressing for the sake of shorter transmission time.
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GSPHerder
So, I'm not seeing anything in my search, so a question for those that are using digi and hf, is a digi transmission shorter then a voice??
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spacemanspiff
All digi modes on hf will be slow. The data has to be sent multiple times for error correction.

Sent from my SM-G988U using Tapatalk
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L
DKR said:
Anything that you use HAS TO BE, by Law, open source. If you are deliberately trying to encrypt your communications, understand the loss of your license will be the least of your legal troubles.
Click to expand...
97.309(b)

Where authorized by §§ 97.305(c) and 97.307(f), a station may transmit a RTTY or data emission using an unspecified digital code, except to a station in a country with which the United States does not have an agreement permitting the code to be used. RTTY and data emissions using unspecified digital codes must not be transmitted for the purpose of obscuring the meaning of any communication. When deemed necessary by a Regional Director to assure compliance with the FCC Rules, a station must:

(1) Cease the transmission using the unspecified digital code;

(2) Restrict transmissions of any digital code to the extent instructed;

(3) Maintain a record, convertible to the original information, of all digital communications transmitted.
Click to expand...
That wasn't an obscured or encrypted transmission Mr. ARRL Volunteer Monitor, I was just experimenting with a new digital mode I'm developing. I call it "NOYFB" but it's not quite ready for publishing yet. ;)
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PaulGray
GSPHerder said:
Are there any digital devices available to the public that compress and burst transmissions over Ham freqs?
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11 (2) The Licensee shall only address Messages to other Amateurs or to the stations of those Amateurs and shall not encrypt these Messages for the purpose of rendering the Message unintelligible to other radio spectrum users.
After that, the question would be, is burst transmissions a form of encryption?
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PSYOP Soldier
PaulGray said:
11 (2) The Licensee shall only address Messages to other Amateurs or to the stations of those Amateurs and shall not encrypt these Messages for the purpose of rendering the Message unintelligible to other radio spectrum users.
After that, the question would be, is burst transmissions a form of encryption?
Click to expand...
in US .mil, when i was in, all burst transmissions were automagically encrypted then sent.

Users could use a cipher code, OTP or some other things, like a book cypher too..

Again, totally against the fcc rules, so....
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I
Since these always go off the rails pretty quickly, here's something on topic:
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D
DKR said:
Use of frequency hopping, pseudorandom, spread spectrum communications is legal for hams.

Same stuff used (technology) used by the USAF for the F-117 some time back.

Don't know of any 'burst' type protocols available to the 'public'.

Anything that you use HAS TO BE, by Law, open source. If you are deliberately trying to encrypt your communications, understand the loss of your license will be the least of your legal troubles.
Click to expand...
Not if you have a Commercial (Part 90) License

www.law.cornell.edu

47 CFR § 90.553 - Encryption.

www.law.cornell.edu www.law.cornell.edu
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PSYOP Soldier
Disturbed70 said:
Not if you have a Commercial (Part 90) License

www.law.cornell.edu

47 CFR § 90.553 - Encryption.

www.law.cornell.edu www.law.cornell.edu
Click to expand...
Damn!!! you ailed it, forgot all about the commercial stuff...

That right there may be the missing piece....

thank you...(y)
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D
PSYOP Soldier said:
Damn!!! you ailed it, forgot all about the commercial stuff...

That right there may be the missing piece....

thank you...(y)
Click to expand...
Our group has operated under a commercial license for years, and I have one for my own business.
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spacemanspiff
Disturbed70 said:
Our group has operated under a commercial license for years, and I have one for my own business.
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I have one also it allows me to operate on two frequencies in vhf. Didn't op mention hf?
I have no clue about commercial hf.

Sent from my SM-G988U using Tapatalk
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D
spacemanspiff said:
I have one also it allows me to operate on two frequencies in vhf. Didn't op mention hf?
I have no clue about commercial hf.

Sent from my SM-G988U using Tapatalk
Click to expand...
Ah, didn't see that part. Group has both VHF and UHF. I have UHF.
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It depends.

With digital, my experience has been it's a sliding scale between Accuracy/Reliability vs Speed. If you want speed, you give up accuracy. If you want accuracy, you give up speed.

A fun thing to mess with is to jack up Fldigi's morse WPM factor. 50 wpm. Sounds really cool on your end, but depending on factors on the receiving end, can be tough for the software (or human) to decipher. It's an eye-opener as far as limitations.

Functional workaround is brevity codes. Single key words that mean entire phrases or a set of directions. As the meme goes: "why waste time say lot word, when few word do trick?" The OG CW guys already thought of this back in the 1900's. It's why we have Q-codes, or NATO Z-codes.

Speaking of: Voice time for speaking of that quote = Approx. ~4 seconds. Olivia 4/2k = ~3.8 seconds. (Note: my timing skills are pretty half-assed.) So technically-speaking yes, digital is shorter transmit time vs voice in this scenario. But there's too many variables to make this legit. Speak like a classy southern gent, and voice will take a lot longer. Speak like a panicked rapper, and voice would be faster. The trick with digital though is making sure that whoever is on the other end can clearly receive and decipher whatever fax machine noises your rig is spitting out.



GSPHerder said:
So, I'm not seeing anything in my search, so a question for those that are using digi and hf, is a digi transmission shorter then a voice??
Click to expand...
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Disturbed70 said:
Our group has operated under a commercial license for years, and I have one for my own business.
Click to expand...
I believe a commercial radio operator's license is different from a site license for a business.
A friend has his commercial license, which is required so that he can maintain broadcast equipment for the local AM & FM stations.

I suspect your license doesn't allow you to work on 50,000 watt transmitters.
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DKR
AN individual may be licensed (Commerical radiotelephone license, now called a GROL) to perform maintenance on aeronautical or shipboard systems.

A person or business may be licensed to use part of the spectrum - like GMRS or commercial VHF (MURS)

The GROL (formerly Commerical radiotelephone license) is not required for engineering jobs in radio and television broadcasting.

The more you know....
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