[HN Gopher] AMPKT - Amateur radio packet explorer
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       AMPKT - Amateur radio packet explorer
        
       Author : hexagonal-sun
       Score  : 30 points
       Date   : 2023-09-21 20:23 UTC (2 hours ago)
        
 (HTM) web link (github.com)
 (TXT) w3m dump (github.com)
        
       | hexagonal-sun wrote:
       | This is a project to connect two Linux machine's network stacks
       | via the amateur radio bands. It uses Linux's TAP interface to
       | read & write packets at layer 2 to/from the kernel. QPSK
       | modulation is used at the RF layer.
       | 
       | For now experimentation has mainly been done in a Ramsey box. The
       | next step is to add a callsign field to the QPSK frames so the
       | data can be legally TX'd.
        
         | drmpeg wrote:
         | You'll like my IP over DVB-T2 test bed using GNU Radio. It uses
         | the ULE protocol dvbnet driver that's built into Linux.
         | 
         | Not shown on the diagram is that it also supports IPv6.
         | 
         | https://www.w6rz.net/ofdm3.png
        
       | lobsterslive wrote:
       | If anyone is looking for a really good place to get started with
       | SDR, I'd highly recommend the RTL-SDR Blog V3:
       | 
       | https://www.amazon.com/gp/product/B0BMKB3L47
        
         | cogman10 wrote:
         | Dumb question (and maybe this isn't legal?) but are there SDR
         | transceivers/libraries?
         | 
         | It'd be neat to have a zigbee/zwave hub with my SDR so I could
         | mix and match some stuff.
        
           | _whiteCaps_ wrote:
           | Yup, lots around. The hint is to look for 'full duplex' SDR.
        
           | ajsnigrutin wrote:
           | Doing zigbee or zwave stuff is a lot easier with zigbee and
           | zwave than with SDR. Just use homeassistant with something
           | like zigbee2mqtt, and you can control your LIDL light with an
           | Ikea light switch and xiaomi movement sensor without any
           | issues.
        
           | cadr wrote:
           | HackRF One is an option. There are a number of others.
           | Legality varies by country/frequency/power level.
           | 
           | Can also make a Raspberry Pi act as a transmitter
           | (https://github.com/F5OEO/rpitx), which could hit the zwave
           | frequency but not the zigbee one. (Also, make sure to put a
           | low pass filter on it.)
        
           | mwbajor wrote:
           | Gnuradio
        
       | kunwon1 wrote:
       | I recently got back into amateur radio with an SDR (listening
       | only, my license has lapsed and I need to renew it)
       | 
       | I found that using the FT8 protocol, I can pick up transmissions
       | from up to ~6000 miles away, using a very cheap magnetic loop
       | antenna mounted indoors in my apartment. My building is made of
       | concrete slabs and I was pretty shocked that I was able to
       | receive such distant transmissions.
       | 
       | I think I've invested maybe $70 into radio equipment for this
       | capability. I've listened to a lot of other signal sources, but
       | so far FT8 is the most interesting. I can run a companion app
       | that maps out all the contacts, it is pleasing to watch on a nice
       | slow evening
        
         | nvy wrote:
         | Wow. Can you link to the antenna you use?
         | 
         | Could you achieve those distances transmitting with the same
         | antenna, assuming you renewed your license?
        
         | bmitch2112 wrote:
         | FT8 is lots of fun. Even more fun when you go to a park or up a
         | summit and see how far you can get out and how far you can
         | hear.
         | 
         | You don't need very expensive radio equipment to transmit FT8
         | so if you do get your licence back it is worth looking into.
         | 
         | http://qrp-labs.com/qdx.html
        
           | lhamil64 wrote:
           | I got my license about a month ago and ordered a QDX to try
           | FT8, but they're super back-ordered. The orders page shows
           | that they're just now fulfilling orders from May.
        
       | mzerod wrote:
       | I have a QPSK & BPSK packet radio link to several other stations
       | via the QO-100 satellite narrowband transponder, using a couple
       | of Pluto SDRs and in some cases a mix/match of RTL SDR dongles
       | and 70cm radios with transverters.
       | 
       | Only a small group (4 so far) doing it, but we can be heard on
       | the WEBSDR hosted at Goonhilly Earth station[1]
       | 
       | Due to small dish sizes on RX (10GHz) we are keeping it simple
       | and open at 1200 BPSK and QPSK 2400 with IL2P[2][3] for FEC+RS
       | robustness, and not even close to the 2.7Khz max permitted
       | bandwidth.
       | 
       | [1] https://eshail.batc.org.uk/nb/ - 10489630 USB
       | 
       | [2] https://tarpn.net/t/il2p/il2p.html
       | 
       | [3] https://eindhoven.space/il2p
        
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       (page generated 2023-09-21 23:01 UTC)