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N1SU APRS Digipeater & TX IGateConfiguration and setup overview by Jason Buchanan |
If you have a radio capable of UHF 9600 baud for APRS (Kenwood TH-D7A, TH-D72A, TH-D74A, TM-D700, TM-D710, TM-D710GA... others?) put it to good use! UHF APRS is alive and well in Seattle.
RCA: micro-USB connector had no strain relief and damaged the connector on the board. Need to get a proper case at Vetco.
TNC-Pi on I2C would TX but RX was not working. TNC-Pi9K6 worked normally.
Rebooted Raspberry Pi while troubleshooting and was able to SSH after rebooting, but the Pi itself became a brick on the third reboot.
SD memory card gets very warm when inserted to the Pi, or to a laptop.
Raspberry Pi is completely unresponsive with only power and HDMI connected (no memory card inserted). Tried a known-good power supply and have the same results.
| 1200 | 9600 |
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Notable values:
1200 - TXDelay 30 - (300ms) robust; below 30 reduces overall success
1200 - Persistence 63 - was 15; occasionally would not TX (bug?)
1200 - TXTail - not sure this needs to be anything but 0
1200 - TXDelay 30 - (300ms) robust; below 30 reduces overall success
9600 - Persistence 63 - was 15; occasionally would not TX (bug?)
9600 - TX Level 200 based on recommendations by other Yaesu FT-7800R users
9600 - TXTail - not sure this needs to be anything but 0
Persistence calculated as 256 / #slots - 1 or 256 / 4 = 64 then subtract 1 = 63
Click N1SU-4 then Coverage to see statistics and activity for 440.800. Also, note that UCAPK (66 miles away) and N7ER-10 (33 miles away) are outside of the shaded plot but are reliable paths. W7NWP-4 and N7RIG-5 are within the shaded plot and further enhance the meshed network.
You're really missing out if not using UHF 9600 baud for APRS - congestion is much lower due to the much shorter TX time at 9600 baud.
The crossband aprx.conf configuration file (updated November 2019) is availble for online reference. This configuration includes weather and radiation monitoring via geiger counter sent to UHF and VHF every 30 minutes - this configuration provides interesting data to view propagation changes. The weather data is never sent via APRS-IS and this is intentional, as it intended to be received by UHF and VHF gateways.
N1SU-2 (VHF, 144.390) and N1SU-4 (UHF, 440.800) provide full duplex APRS digipeater and internet gateway services, allowing you to send messages and receive replies using only your radio, no internet or cellular service required.
| N1SU-2 | N1SU-4 | N1SU-13 | RX/TX gateway | APRS uplink | Weather station | Radiation monitor Geiger counter | Seismograph |
144.390 1200 baud Kenwood TM-281A Ham Made cable TNC-Pi |
440.800 9600 baud Yaesu FT-7800R 6-pin DIN TNC-Pi9K6 |
aprx 2.9.0 weewx 3.9.2 9600 baud TX 440.800 |
aprx 2.9.0 | aprsc 2.1.4 |
Davis Weather Monitor II weewx and wmII.py |
Aware Electronics model RM-80 |
Raspberry Shake model RS1D |
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The TNC-Pi and TNC-Pi9K6 are stacked on a single
Raspberry Pi 3 Model B+
aprx 2.9.0 is used for digipeater and APRS-IS internet gateway
weewx and wmII.py are used to read the Davis Weather Monitor II
Aware Electronics model RM-80
is used for gathering radiation rate as microRoentgen per hour, mR/hr - also at http://digistar.com/seattle/
N1SU-13 changes symbol to match APRS spec 1.2 for reporting the level of Nuclear Radiation levels, using type X. Quoted from the spec:
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N1SU-3 was QRT 8-Jul-19 and became N1SU-2 (2 meters).
N1SU-4 (440MHz 9600 BAUD UHF APRS) was QRV 8-Jul-19.