hardwarerelated:ham_radio:rtl-sdr

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
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
- 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. This shows how a K5 gets modified and then the label is aquired manually. This article also finds the unmodified device to be not compliant.
- Search for certified transceivers, example: enter “ＦＴ－70Ｄ” as “型式又名称” and click “送信”

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)

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 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