QSO Today Interview with Jonathan Naylor, G4KLX, on the MMDVM project

G4KLX

12/29/2018

Episode 230 - Jonathan naylor - G4KLX

Jonathan Naylor, G4KLX, pioneered the opening, to amateur radio operators, of D-Star and later other digital repeater modes including DMR and Yaesu system fusion by writing software that could be implemented on Arduino and Raspberry Pi hardware for the creation of multi-mode repeater and hotspot controllers. G4KLX shares his ham radio story with Eric, 4Z1UG, in this QSO Today.

Show Notes

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QRP Labs QCX Transceiver Kit

Jonathan, G4KLX websites

Fred Ward, G2CVV

RSGB - Radio Society of Great Britain

Shortwave Listener

First License: G8TXQ - Class B license
Sept 1980 upgrade to Class A

Certification: HND computer science

1750 tone burst

Sunspot Cycle 21

Tonna Antenna

G8LMW consulting - LMW Electronics 23 cm transverter

2C39 PA Tube

4CX250B PA Tube

Neighborhood: Derbyshire, UK

HB9DRD, Jonathan’s Swiss callsign

Mobile communication modes and projects:

D-Star digital mode
K5TIT G2
Open G2 Gateway Project
IRCDDB - IRC DSTAR Database
D-Star Reflector - the killer app for D-Star
Robin, AR4RC, made D-Star reflectors
XRF Protocol -
Yaesu System Fusion
DMR - digital mobile radio
NXDN - next generation digital narrowband (used by Kenwood and Icom commercially)
P25 - called Project 25 or APCO-25
DVSI codec
TDMA - time division multiple access
Tetra - public service protocol used in Europe
DMR Gateway
DMR Color Code
Brandmeister Network
D-Star
MMDVM Project
Pi-Star - PiStar Digital Voice Software

Radios:

Icom IC-240 synthesized VHF transceiver using diode matrix for channel selection
Icom IC-22A VHF crystal controlled transceiver
Heathkit DX-100
Yaesu FTDX400
Connect Systems CS700
Kenwood TS-770
Icom IC-202
Icom IC-91 Dstar radio
Motorola XTS3000 P25 radio

David, PA7LIM

G4KLX PCRepeater Controller

uWave SDR

Greatest challenge to amateur radio: Getting young blood into ham radio.

Excited most by: Rise of SDR using simple hardware but massively flexible.

Advice to new or returning hams: Investigate the new elements.

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Icom IC-240 VHF Transceiver with diode matrix programming

Yaesu FTDX-400 HF Transceiver

Icom IC-91AD D-Star Portable

DMR Zumspot Hotspot

2 Comments

Ed link

1/2/2019 01:32:37 am

One small change to the show notes above. The class B licence that Jonathan got in the seventies was NOT equivalent to the US technician licence - you'd have to come into this century and the
introduction of the foundation licence in the UK before you got such a low level licence. The only difference between the UK class A and B licences was a 12 wpm Morse code test. If you did not or could not take and pass the Morse test your UK Amateur Radio licence was a class B licence which was not allowed access to the HF bands, only 144MHz and up. The City and Guilds of London Institute Radio Amateurs Exam covered theory of radio and electronics and governing regulations and was the same exam that both Class A and B licensees passed. After that was passed, sitting and passing the 12 word per minute Morse code test allowed you to apply for a class A (VHF plus HF) licence. Without the Morse test pass you could apply for a VHF only Class B licence.
The Class B licence in the UK in the seventies is the equivalent of the Extra class in the US today or the CEPT Full licence.

Eric

9/26/2021 08:50:28 am

Before the introduction of class B licences, you had to pass the morse test. My G3WRL licence was issued in 1967 but I passed the RAE in 1964 at the age of 14. It just took me a long time to learn morse code. I was just leaving school and starting my first job so not much time for code.

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G4KLX

Episode 230 - Jonathan naylor - G4KLX

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