8 Mar
2018
8 Mar
'18
2:52 a.m.
https://tnc-x.com/TNCPi.htm
73's f4dkf
De : David Ranch <amprgw(a)trinnet.net>
À : AMPRNet working group <44net(a)mailman.ampr.org>
Objet : Re: [44net] TNC for Raspberry pi that support 9600 Baud ?
Date : 08/03/2018 07:10:00 CET
I agree with everything Bill has mentioned. Direwolf can work well
north of 19200bps if it has a soundcard that can support say 96Khz or
192Khz into a radio that can handle the increased bandwidth too. The
larger issue is the lack of any data grade radios. I'm talking radios
with a RX->TX and TX->RX times in say the low tens of milliseconds
range. Without fast key-up and rx recovery times, there just isn't much
we can do here to really "go faster".
NW Digital's UDRX has promised something like this this but it's been
years... I'm still hoping it or something similar will come to market
that's affordable. Here's hoping!
--David
KI6ZHD
On 03/07/2018 06:53 PM, Bill Vodall wrote:
Couldn’t you
just use dire wolf? It is a free soft Tnc that supports 9600
https://github.com/wb2osz/direwolf
Direwolf is awesome..
I’m a huge fan of direwolf. Pair a usb soundcard
with a cheap radio and you
can easily have a ~$100 dollar aprs rigs that can tx and rx.
We still, even after
all these years, have a real lack of a 'good'
higher speed packet radio. The cheap (BaoFeng?) radios will work
(sorta) for APRS but at slower speeds (maybe up to 3600?) and they
have a TXD an order of a magnitude longer than acceptable.
There are some options for 9600 (or faster) but there are still issues
and challenges.
I had to spend more than $100 total to do 9600
I'd question the whole
The problem with Packet Radio is still the
'radio.' A reasonable 9k6
station is about $250 - but at that price better off just getting an
off the shelf Kenwood TH-D710 which works well at 9k6 and offers a
second channel.
Adjusted for time - these are still way cheaper than the $500 I paid
in 1986 for my first 1200 baud packet station consisting of a
Kantronics KPC and Yeasu HT.
The article on 9600 packet in last years DCC proceedings (PDF is
available on the web) is a good review of the technology and is a
start for looking at radios.
73
Bill, WA7NWP
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