A selection of tiny clocks, sync’d a variety of ways – by hand or by (S)NTP/chrony. Featuring Raspberry Pi Pico, ESP32 and micropython.
Category Archives: telecom
Old Meets New: Analog (1G) TACS Cellphone meets Lime SDR
Bringing an old analog (1G) Cleartone CTN9000 mobile phone handset back to life with the aid of a software-defined radio (Lime SDR) and osmocom_analog.
Phoney – Psion Series 3a spoof voice calling from 1996
An app written in 1996 to simulate making voice calls from a Psion Series 3a.
One of The Many Promises of 5G – Accurate Time Transfer
One of the many promises of 5G is accurate time-transfer. I spent a couple of days travelling around the North West of England testing exactly how accurate available time transfer was from commercially deployed 5G installations.
A SIP trip down memory lane… back to Asterisk PBX & VOIP
A long time ago I built a VOIP PBX. I’ve been wanting to build & use another for a long time and finally got round to it with a £10 Cisco phone and £14 USB dongle…
MCMF – MF4 dialling for the Psion MC400
Adding MF4 (DTMF) dialling capabilities to the legendary Psion MC400 laptop from 1990
Reviving a relic – a time machine from the past – the Enhanced Waveform Generator
Reviving some 1990s era tech …
Room 7609 