Re: [Raspberry_Pi_4-Ham_RADIO] raspberry pi for packet radio
- Hi,I used a USB to Serial adapter. I did get it to work sort of. I was attaching to my Kantronics KPC-3 through minicom. I could get it to recognize the serial port, but when I slowed it down to 1200 baud, it crashed. (locked up) I had to log into the unit via SSH and tell it to re-boot to get the unit to recover. I'm getting a TTL to serial adapter, and I'm going to hook that up to the GPIO ports. I'm thinking this will be a little cleaner than an adapter.I can get it to work on my Ubuntu box with the same cables, using the same software. So I know it should work.'73Eric ScottKC7KLZ
From: John Wiseman <john.wiseman@...>
Sent: Saturday, September 8, 2012 11:14 AM
Subject: RE: [Raspberry_Pi_4-Ham_RADIO] raspberry pi for packet radio
Pascal,The PI GPIO pins operate at 3.3 volts, and the PI is likely to be damaged by applying 5 volts from a normal TTL port. You will need a level converter on the TNC to PI lead. I used a simple resistor divider. Most TTL inputs are happy with the lower voltage from the PI.Normally the PI linux kernel allocates the serial port as a console. You need to disable this to use it for packet.I've used the linux ax.25 and netrom code, and the linux node. I haven't tried jnos.73,John
From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of ve2hom
Sent: 08 September 2012 18:30
Subject: [Raspberry_Pi_4-Ham_RADIO] raspberry pi for packet radioHello all,
I have a raspberry pi and I want to use it for making a packet radio server. I have think to use jnos2 and I want to connect it with my mfj-1270c tnc. This one have a ttl port on the back, can I connect it directly to the GPIO port of the raspberry pi?
Other question, if I try to use a usb to serial adaptor when I attach the port an arror says "protocol error", don't know if it's because jnos don't like usb serial port. Any clue?
73' de Pascal
- Well done John!!!
I hope that you will make these available to the community. Such an incredible idea you have. Can't wait to hear about your progress of your project.
--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, "John Wiseman" <john.wiseman@...> wrote:
> They are all working here at the moment, but dropbox can be a bit
> tempermental at times! If you cant get them after a few attempts let me
> konw, and I'll find somewhere else to upload them.
> 73, John
> From: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
> [mailto:Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of Perry
> Sent: 05 November 2012 18:40
> To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
> Subject: Re: [Raspberry_Pi_4-Ham_RADIO] PI TNC - progress report.
> The 0573.png is a dead link for me.
> Sent from my iPad
> On Nov 5, 2012, at 7:50 AM, "Mike" <mmelnik1@...> wrote:
> Very nice job John.
> Mike N9PMO
> <http://www.n9pmo.com> www.n9pmo.com
> -----Original Message-----
> From: <mailto:Raspberry_Pi_4-Ham_RADIO%40yahoogroups.com>
> [mailto: <mailto:Raspberry_Pi_4-Ham_RADIO%40yahoogroups.com>
> Raspberry_Pi_4-Ham_RADIO@yahoogroups.com] On Behalf Of John
> Sent: Monday, November 05, 2012 9:12 AM
> To: <mailto:Raspberry_Pi_4-Ham_RADIO%40yahoogroups.com>
> Subject: [Raspberry_Pi_4-Ham_RADIO] PI TNC - progress report.
> Hi folk,
> The production boards have now arrived, and I've built a couple of them,
> Here are some photos of a pi with two TNCs attached.
> As I mentioned in a post earlier today, the RFM22 prototypes are
> working, and I hope to have the production boards in 2-3 weeks.
> 73, John G8BPQ
> For those new to the group, I have been working on a TNC for use with
> the pI that is the same size as the pi and plugs into the expansion
> header. The prototype was a TNC-X, with a 26 way header superglued to
> board. There is a photo of it on the home page of this group.
> I now have two TNC's running, and can connect between them. See photo at
> https://dl.dropbox.com/u/31910649/IMGP0573.png. This show the prototype
> - the production boards will have a DB9 instead of the Mini-DIN radio
> connector. A batch of production boards has been ordered, and should be
> here in 2-3 weeks.
> I've also built a couple of units using the RMF22B 100 mW 434 Mhz
> tranceiver model. They both transmit - I now need to get the receive
> side working. There is a photo at
> I looked at the higher powered (500 mw) RMF12BP, and ordered a couple
> for experiments. But when I looked into the module in more detail I
> found it was not compatible with the RFM22B, and is less flexible and
> more difficult to program. I've since found the RFM23BP, which is a 1
> watt unit that is compatible with the RFM22B, so I've ordered a
> couple of them for testing, and designed a board that will take either
> the 22B or the 23BP. Although it is primarily indended for use with the
> PI, it will also have an async port, so it can be used as a standalone
> KISS TNC/Radio.
> 73, John G8BPQ