44net June 2019

44net@mailman.ampr.org

25 participants
17 discussions

Re: [44net] NPR (New Packet Radio) : new firmware with 56kBaud and 120kBaud
by Mark Phillips 17 Jun '19

17 Jun '19

".... may use any technique whose technical characteristics have been documented publicly ...." This mode is documented publicly along with its source code. I'd say we are good. So now it's just the symbol rate and bandwidth issue to overcome. I like the idea of multiple carriers too. Bond them together on demand perhaps? Mark On Mon, Jun 17, 2019 at 4:54 PM Steve L via 44Net <44net(a)mailman.ampr.org> wrote: > > > > ---------- Forwarded message ---------- > From: Steve L <kb9mwr(a)gmail.com> > To: AMPRNet working group <44net(a)mailman.ampr.org> > Cc: > Bcc: > Date: Mon, 17 Jun 2019 15:54:13 -0500 > Subject: Re: [44net] NPR (New Packet Radio) : new firmware with 56kBaud > and 120kBaud > The rules no longer really specify how you must ID, like pre-1980's. > Basically in this case you ID in the mode > itself, just like D-Star, YSF etc, does. > > If the digital code was unspecified (also allowed) you'd likely have > to default to a CW ID. > > §97.119 Station Identification > > (b) The call sign must be transmitted with an emission authorized for > the transmitting channel in one of the following ways: > > (3) By a RTTY emission using a specified digital code when all or part > of the communications are transmitted by a RTTY or data emission; > > §97.309 RTTY and data emission codes. > > (4) An amateur station transmitting a RTTY or data emission using a > digital code specified in this paragraph may use any technique whose > technical characteristics have been documented publicly, such as > CLOVER, G-TOR, or PacTOR, for the purpose of facilitating > communications. > > On Mon, Jun 17, 2019 at 11:40 AM David Ranch <amprgw(a)trinnet.net> wrote: > > > I'm not an expert on FCC Part 97 and I don't want to derail this > > conversation but I don't think some of these protocols are legally > > self-identifying. > > > > > > > ---------- Forwarded message ---------- > From: Steve L via 44Net <44net(a)mailman.ampr.org> > To: AMPRNet working group <44net(a)mailman.ampr.org> > Cc: Steve L <kb9mwr(a)gmail.com> > Bcc: > Date: Mon, 17 Jun 2019 15:54:13 -0500 > Subject: Re: [44net] NPR (New Packet Radio) : new firmware with 56kBaud > and 120kBaud > _________________________________________ > 44Net mailing list > 44Net(a)mailman.ampr.org > https://mailman.ampr.org/mailman/listinfo/44net >

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Hamnet over 70cm : NPR (New Packet Radio)
by f4hdk 08 Jun '19

08 Jun '19

Hello, I am Guillaume, callsign F4HDK, a french amateur-radio operator, and a hacker-maker. I would like to share with you my last project : NPR (New Packet Radio). All documentation is provided here : https://hackaday.io/project/164092-npr-new-packet-radio This solution can transport bi directional IP trafic over 70cm radio links, in a 'point to multipoint' topology, at datarate up to 500kbps. This can be used to increase the range of existing HSMM-Hamnet networks, at lower datarates. It's designed for "access", not backbone, and not designed for H24 use. Its is 100% open-source. Do not hesitate to ask me questions about it. I hope it will interest some people here. 73, Guillaume F4HDK

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Re: [44net] Hamnet over 70cm : NPR (New Packet Radio)
by Rob Janssen 05 Jun '19

05 Jun '19

> On Mon, 3 Jun 2019, David Ranch wrote: > >/(6) A RTTY, data or multiplexed emission using a specified digital code /> >/listed in ?97.309(a) of this part may be transmitted. The symbol rate must not /> >/exceed 56 kilobauds. A RTTY, data or multiplexed emission using an unspecified /> >/digital code under the limitations listed in ?97.309(b) of this part also may /> >/be transmitted. The authorized bandwidth is 100 kHz. / > 56 kilobauds is because the Telebit Trailblazer existed; it used OFDM > and 6 "baud" carriers. The Trailblazer was fast, but it wasn't *that* fast! It actually was like 19200 baud async, internally some 18kbps sync. This was fast compared to the usual V.22bis (2400 bps) modems of the day, but of course later telephone modems appeared that could to 56k. We ran a Unix system with UUCP at work in those days but we could not use modems that fast because the machine wasn't able to handle full 19200 baud async I/O as it could not handle the interrupt load... those were the days. (It was an NCR system with a separate processor for serial I/O, but IBM PC and clones in those days also struggled at 19200, that is why the 16550 chip with hardware FIFO was created...) A couple of years later I bought a ZyXEL U-1496+ modem that also did 19200 over phone lines, and was popular at some local ISPs. Like the Trailblazer it also used a 68000 processor and it cost well over $500 in local currency. I agree that those modems are not going to work over radio. Even on telephone lines they perform lengthy "training" sequences to measure the phase response of the line, and then assume it remains the same over the duration of the call. Rob

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Re: [44net] Telebit Trailblazer over radio
by John Gilmore 05 Jun '19

05 Jun '19

Telebit was doing the modulation in signal processing software in a dedicated big-grasshopper-sized Motorola 68000 chip inside the modem. These days we could do the same modulation in software in just about any chip. But as Brian said, the signal impairments in multi kilometer twisted pair telephone circuits with occasional loading coils, chopped into 56k digital bitstreams and reconstituted at the other end before transiting a different long twisted pair, are very different than the impairments typically experienced when passing a signal thru typical radio circuitry and kilometers of radio "ether" and interference. There's free software for messing with OFDM over narrowband radio (e.g. not WiFi); here are a few starting points: https://github.com/rwth-ti/gr-ofdm https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4984&context=theses https://github.com/kit-cel/gr-lte John

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Re: [44net] Portal encap file by email option
by Jean Létourneau 04 Jun '19

04 Jun '19

My guess it depend how many updates their information. On Tue, Jun 4, 2019 at 3:51 AM R P via 44Net <44net(a)mailman.ampr.org> wrote: > > > > > ---------- Forwarded message ---------- > From: R P <ronenp(a)hotmail.com> > To: "44net(a)mailman.ampr.org" <44net(a)mailman.ampr.org> > Cc: > Bcc: > Date: Tue, 4 Jun 2019 07:49:41 +0000 > Subject: Portal encap file by email option > Hi there > I have noticed that there is option to get the encap file by email > does anyone know how often the file change a day ? (if i chose to get it "when file change" ) ? > Thanks forware > Ronen - 4Z4ZQ > http://www.ronen.org > Ronen Pinchooks (4Z4ZQ) WebSite<http://www.ronen.org/> > ronen.org (Ronen Pinchooks (4Z4ZQ) WebSite) is hosted by domainavenue.com > www.ronen.org > > > > [https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-anima…]<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> Virus-free. www.avast.com<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> > > > > ---------- Forwarded message ---------- > From: R P via 44Net <44net(a)mailman.ampr.org> > To: "44net(a)mailman.ampr.org" <44net(a)mailman.ampr.org> > Cc: R P <ronenp(a)hotmail.com> > Bcc: > Date: Tue, 4 Jun 2019 07:49:41 +0000 > Subject: [44net] Portal encap file by email option > _________________________________________ > 44Net mailing list > 44Net(a)mailman.ampr.org > https://mailman.ampr.org/mailman/listinfo/44net -- Sysop de: VE2PKT (BBS), VE2PKT-13 (URONode) : VE2RCN-1, VE2RGM-1, VE2RGC-1, VE2RVA-1, (The-Net) : VE2PKT-9 (DXCluster), VE2PKT-10 (Winlink Gateway) RF: 147.435 Mhz (1200 Bps), Internet: Telnet://nodes-ve2pkt.dyndns.org port 23 (Network Node) Telnet://fbb-ve2pkt.dyndns.org port 6300 (FBB BBS) Telnet://ve2pkt.dyndns.org port 9000 (DXCluster) E-Mail: packet: ve2pkt(a)ve2pkt.#qbc.qc.can.noam ampr net: ve2pkt(a)ve2pkt.ampr.org Inet: ve2pkt(a)gmail.com

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Re: [44net] Portal encap file by email option
by Brian Kantor 04 Jun '19

04 Jun '19

Because some of the gateways have dynamic IP addresses, the file can change often, sometimes as often as once an hour. - Brian On Tue, Jun 04, 2019 at 07:49:41AM +0000, R P via 44Net wrote: > From: R P <ronenp(a)hotmail.com> > Subject: Portal encap file by email option > > Hi there > I have noticed that there is option to get the encap file by email > does anyone know how often the file change a day ? (if i chose to get it "when file change" ) ? > Thanks forware > Ronen - 4Z4ZQ > http://www.ronen.org > Ronen Pinchooks (4Z4ZQ) WebSite<http://www.ronen.org/> > ronen.org (Ronen Pinchooks (4Z4ZQ) WebSite) is hosted by domainavenue.com > www.ronen.org

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Portal encap file by email option
by R P 04 Jun '19

04 Jun '19

Hi there I have noticed that there is option to get the encap file by email does anyone know how often the file change a day ? (if i chose to get it "when file change" ) ? Thanks forware Ronen - 4Z4ZQ http://www.ronen.org Ronen Pinchooks (4Z4ZQ) WebSite<http://www.ronen.org/> ronen.org (Ronen Pinchooks (4Z4ZQ) WebSite) is hosted by domainavenue.com www.ronen.org [https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-anima…]<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> Virus-free. www.avast.com<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…>

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44net June 2019