New Digital Modes Changing Complexion of Bands and Perhaps of Ham Radio

ARRL ^ | 11/2/17

[markomalley]

I have to admit that I really have enjoyed JT65 for tracking down some relatively rare DX that I otherwise would have a heck of a time snagging. We're talking <500mW with a short random-wire antenna thrown into some trees. All 50 states and 105 countries on every continent.

And, as far as utility is concerned, if a group of preparation-minded hams could develop a CEOI (communications-electronics operating instruction) for a private net, some very effective communications could be exchanged during a "disaster" at very, very low power with very, very stealthy equipment (low enough power where it would be extraordinarily difficult for fox-chasers to be able to catch them). If you catch my drift.

[Scrambler Bob]

develop a CEOI (communications-electronics operating instruction) for a private net
= = =

If you can conceive it, it can (and will) be done.

[Fiddlstix]

Bookmark

[whistleduck]

Huh?? I operated 50+ years ago. This sounds like a RTTY operation highly souped up with computer detection and transmission. Hams used keyboards and hf 60 plus years ago. Am I close?

Miss my 20 and 40 cw dx and 160 am. A vertical and 50 watts. Really cooked when I moved up to ssb.

[WhoisAlanGreenspan?]

bump because I’m following what you’re saying, I’m just not going to tell anyone.

[dsc]

What’s it cost to get into that game?

[Tilted Irish Kilt]

Digital Modes Changing Bands and Perhaps ham radio
Ping

[chajin]

bttt

[RushIsMyTeddyBear]

Bkmrk.

[Texas Fossil]

My first RTTY demodulator was a twin cities tube affair.

Home brewed a number of AFSK modulators and demodulators.

My Fleisher TU-170 was an absolute jewel (sorry I ever sold it).

Still have a Robot keyboard. (CW, Badot & ASCI)

Not that active any more, but thinking about fixing that. Still have some fine gear.

I did a bit of homebrew QRP work. Really liked that.

[dragnet2]

It’s been around for a few years now. Digital mode, software defined radios or SDR’s etc..Most hams nowadays are tied into the Internet one way or another and digital is yet another amateur radio mode.

[dragnet2]

It’s been around for a few years now. Digital mode, software defined radios or SDR’s etc..Most hams nowadays are tied into the Internet one way or another and digital is yet another amateur radio mode.

[SpaceBar]

Dogear page for later.

[TheCipher]

Just saw this the other day. Comparing FT-8 to Olivia

FT-8 vs. Olivia

And another one :

Olivia Too Slow? Try Contestia

[backwoods-engineer]

I love FT8. It's so much faster to make a contact than the older JT65, and almost as sensitive. I worked New Zealand from Alabama, with -16 dB signal to noise ratio!

I prefer the computer-based digital modes to HF voice; the background noise is terrible, my hearing is not good, I have tinnitus, and I just can't pull stations out of the noise. But Joe Taylor's software WSJT-X sure can.

[Lurker]

For later.

Thanks.

L

[backwoods-engineer]

The mathematical codes this new software uses for detection weren’t even invented 50 years ago. But yes, like RTTY, it uses FSK, but with 8 levels (FT8) or 65 levels (JT65) per symbol instead of just 2.

[miele man]

book mark

[backwoods-engineer]

Got a computer and a somewhat-modern HF rig? Then, it's just the cost of cables. If your HF transceiver has VOX, you can cable up the sound port in your computer to the rig, download the FREE software (WSJT-X), and you're on the air.

You can control your rig's frequency with WSJT-X, but I don't. There's only one center frequency for each mode for each band, so I just stored them in my old Kenwood rig's memories. I can push a button just as good as the PC can.

[miele man]

What equipment is required other than an HF rig and an antenna? Software from whom?

Thanks