Licensed in Japan as second class equivalent (2-kyu) under the US-Japan reciprocal operating agreement, via U.S. general license KJ6VGQ. Usually operating from Ebisu, Shibuya-ku, Tokyo [PM95up] or Yamanakako-mura, Minamitsuru-gun, Yamanashi [PM95kk] via FT-70D or FT-817ND. Interested in ADS-B, AIS, APRS, digital modes, internet linkages [D-Star, DMR, Wires-X, Echolink, Peanut, etc.], Radiosonde, SDR, SWLing, WEFAX... Member of JARL, Tokyo International Amateur Radio Association [TIARA], JARL QRP CLUB and GQRP. On Mastodon.


Mini 64:1 Half-Wave End-Fed Antenna Transformer

Updated by JH1HNB on 2022.10.10 22:27 - Category: Gear Tags: EFHW, UnUn

Gil of the Radio Prepper YouTube channel sent me his mini End-Fed Half-Wave antenna transformer.

64:1 EFHW

He describes it in these videos.


Master List of Radio Monitoring Platforms

Updated by JH1HNB on 2022.10.08 20:34 - Category: RTL-SDR Tags: ADS-B, Radiosonde, FLARM, OGN, ACARS, AIS, LoRa

This is a master list of crowd-sourced data exchanges, many with an RTL-SDR component.

Type Name/Link Using Devices
Air traffic ADSB Exchange ADS-B Raspberry Pi + RTL-SDR
Air traffic Airframes ACARS Raspberry Pi + RTL-SDR
Air traffic FlightAware ADS-B Raspberry Pi + RTL-SDR *
Air traffic Flightradar24 ADS-B Raspberry Pi + RTL-SDR *
Air traffic OGN (Open Glider Network) FLARM, OGN Raspberry Pi + RTL-SDR
Air traffic OpenSky ADS-B Raspberry Pi + RTL-SDR *
Air traffic Planefinder ADS-B Raspberry Pi + RTL-SDR *
Air traffic RadarVirtuel ADS-B, FLARM, ATC, ACARS Raspberry Pi + RTL-SDR *
Air traffic Thebaldgeek ACARS, etc. Raspberry Pi + RTL-SDR
Marine traffic AISHub AIS Raspberry Pi + RTL-SDR
Marine traffic Pocket Mariner AIS Supplied proprietary, Raspberry Pi + RTL-SDR **
Marine traffic Marine Traffic AIS Supplied proprietary, Raspberry Pi + RTL-SDR **
Marine traffic Ship Finder AIS Raspberry Pi + RTL-SDR **
Marine traffic VesselFinder AIS Raspberry Pi + RTL-SDR **
Radiation, air quality Safecast Sensors Proprietary
Radio Broadcastify Radio feeds (police/EMS/etc.) PC + radio
Radio Openmhz Radio feeds (police, fire) (US) PC + RTL-SDR
Satellites R2server APT, LRPT, FSK, etc. Raspberry Pi + RTL-SDR
Satellites SatNOGS VHF/UHF, mixed Raspberry Pi + RTL-SDR
Satellites TinyGS LoRa LoRa capable ESP32
Seismic activity RaspberryShake ADS-B Proprietary
Weather Weather Underground N/A Commercial weather stations + bridge
Weather balloons SQ6KXY Radiosonde Tracker Various (RS41, etc.) Raspberry Pi + RTL-SDR
Weather balloons SondeHub Various (RS41, etc.) Raspberry Pi + RTL-SDR; LoRa capable ESP32
* These also supply proprietary receivers to plug gaps in coverage.
** Also accepts NMEA-0183 messages via UDP socket that is relatively simple to set up from generic software.


Saleae clone logic analyzer with sigrok

Updated by JH1HNB on 2022.07.23 23:30 - Category: Gear Tags: Saleae, logic analyzer, sigrok

After watching the OpenTechLab video on "Sigrok and Logic Analyzers", I ordered a Saleae clone from AliExpress.

It came out to 1,258 JPY (appx 9.17 USD, 8.98 EUR);

USB logic analyzer 28mz 8 channel

After installing sigrok on Windows 10, the device was specified in the sigrok PulseView Connect to Device screen using the driver "fx2afw", interface USB, however the device was not found when clicking on "Scan for devices using driver above" button.

Following the documentation, I tried using "Zadig (PulseView)" packaged with sigrok to install the WinUSB driver.

Retrying, the board could be found by scanning, in both sigrok-cli and PulseView.

    C:\Program Files\sigrok\sigrok-cli>sigrok-cli --scan
    sr: asix-omega-rtm-cli: Cannot execute RTM CLI process: Failed to execute helper program (Invalid argument)
    The following devices were found:
    demo - Demo device with 13 channels: D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 A2 A3 A4
    fx2lafw:conn=1.18 - Saleae Logic [S/N: Saleae Logic] with 8 channels: D0 D1 D2 D3 D4 D5 D6 D7

Using a short test program for an Arduino Uno clone:

    // simple program for Arduino Uno clone to check logic analyzer 

    int ladelay =         1; // ms
    int lapin   =        13; // pin no.        

    void setup() {
      Serial.println("Logic analyzer test starting");
      pinMode(lapin, OUTPUT);        

    void loop() {
      digitalWrite(lapin, HIGH); 
      digitalWrite(lapin, LOW);  

and connecting the CH1 and ground to the appropriate pins, sigrok was able to capture the signals.

sigrok using Saleae clone


Ordered NorCal 40a Rev 2.0 PCBs

Updated by JH1HNB on 2022.07.07 17:11 - Category: Gear Tags: NorCal 40a

NorCal 40a Rev 2.0 PCB

I ordered PCBs of NorCal 40a Rev 2.0 and a copy of The Electronics of Radio as a project to prep while working on the ADX.

A classic rig, I'd like to try operating in conjunction with a skimmer and computer controlled key.


tinySA - small spectrum analyzer

Updated by JH1HNB on 2022.07.04 00:15 - Category: Gear Tags: tinySA, spectrum analyser

tinySA spectrum analyser

In preparation for some kit building, I obtained a tinySA spectrum analyzer.

Passed self test, and seems to be the real deal.


ADX LPF (Low Pass Filter) band modules arrived

Updated by JH1HNB on 2022.06.26 11:21 - Category: Gear Tags: ADX

ADX LPF (Low Pass Filter) band modules

I forgot to order the band pass filters from JLCPCB when I ordered the ADX boards, but caught it on the same day. The order went in late night June 16th, and was delivered mid-day June 26th, nice turnaround.

Price per board for a lot of 10 came out to 68 JPY (.5 USD, .48 EUR).