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===== HAM dualband handheld transmitter candidates for me =====

^name              ^Japan cert?^comments ^
|Kenwood TH-D75E   |yes, TH-D75|Can D-STAR, price 9万円 |
|Yaesu FT-70D      |yes        |does System Fusion but not D-STAR, price 170$ |
|Yaesu FT-65R      |yes, FT-65 |price 150$ |
|Yaesu FT5D        |yes        |price 5万円, bluetooth bad? |
|Thumb-DV          |yes        |for computer-based "not-radio radio", can do D-STAR and DMR, 150$ |
|BAOFENG UV-5R     |no         | |
|QUANSHENG UV-K5/K6|no         |hardware w/o mods not certifiable in Japan|
|Radioddity GD-77  |no         | |

  * QUANSHENG UV-K5 with custom firmware 
    * https://github.com/sq5bpf/k5prog - default soft to save factory settings
    * https://github.com/kamilsss655/uv-k5-firmware-custom - firmware I flashed
    * [[https://gigazine.net/news/20240401-quansheng-uv-k5/|link]]
    * https://codeberg.org/armin/uv-k5-firmware-armin
  * **Law in Japan:** 
    * For operation in Japan, a label ("技適マーク") needs to be on the device. It's issued by the government, 無線機　技適証明. I do not see one for the UV-K5 or K6. [[https://www.youtube.com/watch?v=eXHxKVjbt84|This]] shows how a K5 gets modified and then the label is aquired manually. [[https://www.freeradio.jp/post-1954/|This]] article also finds the unmodified device to be not compliant.
    * [[https://www.tele.soumu.go.jp/giteki/SearchServlet?pageID=js01|Search for certified transceivers]], example: enter "ＦＴ－70Ｄ" as "型式又名称" and click "送信"
===== Software Defined Radio =====
  * my devices:
    * RTL-SDR Blog V4 R828D RTL2832U 1PPM TCXO SMA Software Defined Radio with Dipole Antenna, USD $39.95
    * RTL-SDR Blog SMA Straight Antenna Adapter Set, USD $14.95
  * Fedora:
    * **gnuradio:** allrounder software, dnf -y install gnuradio-examples gr-osmosdr rtl-sdr
    * **gqrx:** watching the spectrum, dnf -y install gqrx
    * **SDR++** dnf install sdrpp (not outputting audio to my hdmi audio sink)
    * **SDR-Angel:** mostly for recording & analyzing
    * **Universal Radio Hacker:** mostly for recording & analyzing
    * **rtl_433:** mostly for recording & analyzing
    * **OpenWebRx** rx.linkfanel.net
  * Kali Linux
    * Convenient as kismet brings in plugins already for ADSB scanning (planes), also AMR
    * https://github.com/bemasher/rtlamr
    * apt install rtl-433 rtl-sdr bladerf-firmware gnuradio gqrx-sdr gr-osmosdr
    * install SDR++ (built for debian sid from github)

  * Various SDR hardware
    * RTL-SDR V4 Dongle
    * Hack RF
    * Hack RF one with portapack
    * https://www.crowdsupply.com/lime-micro/
    * https://www.crowdsupply.com/microphase-technology/antsdr-e200
  * docs
    * https://blinry.org/50-things-with-sdr/
    * German SDR introduction video: https://media.ccc.de/v/gpn21-57-sdr-software-defined-radio-eine-einfhrung
  * [[https://www.motobayashi.net/callsign/enigma/class-band-power.jpg|Frequencies I can use with Japanese level 4]], via [[https://www.motobayashi.net/callsign/enigma/index.html|site]]
  * wspr, ft8, js8 transmitter

===== Japan smart meter (power) research =====
I have a smart meter for my flat, would be nice to get readings.
  * Device names:
    * 富士電機メーター F6DWF-TA. Transmission probably by 920mhz mesh network wireless　("920MHｚメッシュ方式（無線）"), or over power line, or LTE (not likely)
    * Second device: Osaki A6WWA-TA / 4006. For storing power consumption value for 45 days?
  * potential encoding:  ANSI C12.22 [[https://www.researchgate.net/publication/261204560_Data_traffic_analysis_of_utility_smart_metering_network|src]]
  * potential protocols of my smart meter
  * Wi-SUN（ワイ-サン） might be the protocol in use
    * standardized in: 802.15.4g/e/6LoWPAN
    * Frequency 922.5 ～ 927.9MHz, Modulation Binary GFSK
    * Channel Spacing (KHz): 200, 400, 600, Total Number of channels: 38, 18, 12
    * roles in Wi-SUN setups: ホームICT, HEMS(ヘムス/Home Energy Management System)
  * Current state:
    * I see signals with RTL-SDR, in the frequency area 922.5 ～ 927.9MHz. But trying to record it with urh( Universal Radio Hacker), no signal is detected.
    * Maybe it's not GFSK?
    * Wanted to compare with what others receive on http://rx.linkfanel.net/ , but these devices just go to 30Mhz.
    * Creating a baseband recording (.wav file) and then opening it in https://www.sonicvisualiser.org/ on Linux, the program terminates
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