APRS:Automatic Packet Reporting System
APRSは、アマチュア無線上での無線パケット通信を応用してリアルタイムで生データを配信する通信プロトコル。さらなる詳細は、wikipedia JP, wikipedia ENにて。
APRS is an amateur radio-based system for real time digital communications of information of immediate value in the local area. For more detail to go wikipedia.
Tracker
VX-3 (約1W) とPOM Trackerの組み込み試用。12V1ラインで無線機とボード給電になるようまとめた箱。
VX-3 handy(1W) and POM tracker board combine into box for testing. The good point is that both are powered by a 1 power line 12V.
実際の車載での動作テスト動画。(20MB)
Actual in-vehicle, a operation test video.(20MB)
車載スペースにあわせた箱と実際の記録。JH1HST-12(2021-05-23)
The box matched to the in-car space. And rec. JH1HST-12 (23th May 2021).
尚、FT-7900は、受信確認にて。
Memo; FT-7900 for checking a APRS transmission.
I-Gate
試作完成、Raspberry pi4B+RTL-SDRでDirewolf、144.66MHz 1.2kbps。試作段階なのでラズパイの箱のまま調整。(2021-05-26)
The testing model done, Raspberry pi4B+RTL-SDR and system include Direwolf. 144.66MHz 1.2kbps. This is testing stage so used Raspberry pi product-box to adjust.(26th May 2021)
動的テスト。
Active testing.
屋根裏に設置。(2021-05-27)
Installed in the attic.(27th May 2021)
Upgrade, 9600bpsも追加対応。(2021-05-30)
Add 9600bps support.(30th May 2021)
情報と記録。
Information and Record.
https://aprs.fi/info/a/JH1HST-10
(2021-07-04 追記) +20dB プリアンプ追加。
Added preamp +20dB. - July 4th 2021