Packet Radio Support in ptc-go

[Justin Overfelt]

Hello,

I was playing around with the packet radio support in ptc-go (https://github.com/harenber/ptc-go/wiki#using-packet-radio) in an attempt to get Robust Packet Winlink to work. I'm able to use the init parameter as described to get my PTC-IIex to key the radio and transmit one Robust Packet frame (I previously set the packet baud to be R300 over serial). However, pat only keys the radio once and doesn't do it again until it eventually times out.

In looking at the code, it seems to listen for data coming over the PactorChannel (set to 31 as a constant) even if that channel is not in use (because I've switched it using the PTCH init parameter). It's likely I'm misunderstanding something about the way these channels work in the SCS modems, so please let me know!

(this message will primarily be of interest to DL1THM)

Thanks!

Justin AB3E

[Dr. Torsten Harenberg]

Hi Justin,

uff.. yes.. I think this feature got lost after I learned the hard way
that SCS does not handle PACTOR connections correctly following the
WA8DED standard (the "link status" flag - the L command in WA8DED - is
not correctly set during PACTOR connections while it is properly updated
for packet connections). That forced me to change the code to do ugly
string parsing.

So packet would require a completely separate handling compared to
PACTOR (which is rather silly but that's the way they implemented it -
they confirmed it by email).

I will update the Wiki.

Currently I am planning a complete re-write of the whole thing to
properly support listen mode - which is pretty difficult to implement
with the current setup. Will keep packet mode on my list of things to be
checked for.

BTW: SCS told me they maybe plan to move away from WA8DED completely,
but haven't heard anything since then.

73s

Torsten DL1THM

[Justin Overfelt]

Hi Torsten,

Thanks for the reply! I did see some things in the Github repo indicating you were planning a rewrite soon so no worries! I certainly expected rough edges given I was doing something that wasn't even listed as supported anyway! I'm wondering if this kind of thing belongs with better serial-tnc support in Pat in general. I know this is something that Martin is interested in since right now there's only support for Kenwoods.

-Justin AB3E

[Keith Lindsay]

Hi Justin. I've seen this kind of general behavior in the past where I've had RF in the shack issues. Couple of cores clamped on USB cables cleared that up in the past. Your problem may be different but I just thought I would suggest that.

Keith/KI5US 

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