Work progresses on the packet radio interface.
I'll probably commit some more code to CVS tomorrow.
I'm posting this message via a Kenwood TH-D7A.
echicken

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Re: Posted via packet
By: echicken to All on Tue Jul 17 2012 12:24 am

Work progresses on the packet radio interface.
I'll probably commit some more code to CVS tomorrow.
I'm posting this message via a Kenwood TH-D7A.

If you've been playing with 12 meters, I'd say I've heard some of your
beeps.... Like a long steady tone then quick beeping, like a morse code
that has a continous tone for 2-3 minutes then suddenly sending 200+wpm
followed by a long continous tone.... Blips so fast you can't even make
out how many there was and what types....

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Re: Posted via packet
By: John Guillory to echicken on Tue Jul 17 2012 14:35:05

If you've been playing with 12 meters, I'd say I've heard some of your
beeps.... Like a long steady tone then quick beeping, like a morse code
that has a continous tone for 2-3 minutes then suddenly sending 200+wpm
followed by a long continous tone.... Blips so fast you can't even make
out how many there was and what types....

Nope - not me! Packet can be transmitted using a lot of different modulation schemes, however in my testing I've been using Bell 202 (IIRC) 1200 baud AFSK. It sounds like this:

http://www.kb9ukd.com/digital/packet12.wav

Don't think I've ever been on 12 meters. All of my testing is taking place on 2 meters, at 146.555 MHz, at about 5W, and very unlikely to be heard outside of Toronto.

echicken
electronic chicken bbs - bbs.electronicchicken.com - 416-273-7230

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Re: Posted via packet
By: echicken to All on Tue Jul 17 2012 00:24:43

I'm posting this message via a Kenwood TH-D7A.

And I did. Updates have been committed for the following:

exec/ax25tunnel.js
exec/packet-bbs.js
exec/load/kissAX25lib.js

And a new wiki entry has been posted here:

http://wiki.synchro.net/howto:ax25

Definitely a work in progress and there are a number of items on my to-do list, but if anybody wants to mess around with this stuff, it's there.

echicken
electronic chicken bbs - bbs.electronicchicken.com - 416-273-7230

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Re: Posted via packet
By: echicken to John Guillory on Tue Jul 17 2012 05:59 pm

Nope - not me! Packet can be transmitted using a lot of different modulation schemes, however in my testing I've been using Bell 202 (IIRC) 1200 baud AFSK. It sounds like this:

Will check that out, that brings up a very interesting few thoughts here...

You can get away with a much higher baud rate on 2 meters than 10 meters,
I believe off the top of my head 10 meters is 1200 baud, and 2 meters is
56kbaud, or 19.2kbaud... Suppose you had a 2m repeater connected to a 10m
that connected to another repeater that was tied to a 10m on the same frequency, effectively linking the two repeaters via 10m. You get on your 2m radio and transmit packet radio using 19.2k baud, it gets relayed via 10 meters, is it illegal? Also, would it be "legal" to put a 10 meter on a repeater that has AM on a lower frequency using Upper Side Band, or must it go on FM in the upper frequencies where most 10 meter repeaters are?

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Re: Posted via packet
By: John Guillory to echicken on Wed Jul 18 2012 10:17:21

You can get away with a much higher baud rate on 2 meters than 10 meters
I believe off the top of my head 10 meters is 1200 baud, and 2 meters is
56kbaud, or 19.2kbaud... Suppose you had a 2m repeater connected to a 1

Typically you'll find 300 baud on HF (10M and longer) but possibly 1200 - I don't recall off the top of my head, but it's all about the bandwidth you're allowed to use on a given band. On 2M I think 19.2K is as much as you can do, and on UHF you can get into 56K and better.

However, what you can get away with is only part of it. Even on bands where you could do a lot better than 1200 baud, most people don't because the equipment is expensive or it requires modifications to radios. Much as I'd love to mess around with higher-speed packet, it wouldn't be worth it unless I could find other people who wanted to do the same. Most likely I'd end up
with a station that nobody could connect to, because they're just using cheap used, dated packet gear. My goal being to offer a simple packet BBS, I'll just stick with 1200 for now since there would remain at least a small chance that someone might call it.

That said, the code I've written doesn't care about the speed of the link, so long as it's sending and receiving AX.25 frames via a KISS device.

frequency, effectively linking the two repeaters via 10m. You get on your 2 radio and transmit packet radio using 19.2k baud, it gets relayed via 10 meters, is it illegal? Also, would it be "legal" to put a 10 meter on a

In Canada we have specific regulatory language about retransmitting stuff from VHF & up on the HF bands. Basically an operator's voice transmissions can only be retransmitted on a band that they have privileges for, regardless of the privileges of the repeater operator. Not sure if this applies to packet, but it quite possibly may.

meters, is it illegal? Also, would it be "legal" to put a 10 meter on a repeater that has AM on a lower frequency using Upper Side Band, or must it on FM in the upper frequencies where most 10 meter repeaters are?

I'm really not sure about this. Consult the regulations, I guess. I've never encountered a repeater with an input or output frequency lower down in the bands than in the chunk of 10M where FM can be used. Nor one that uses SSB. But I haven't been around for that long, so who knows.

echicken
electronic chicken bbs - bbs.electronicchicken.com - 416-273-7230

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