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Category Archives: telecom

Tiny clock party – it’s not always about nanoseconds…

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.

Posted byzedstarr01/11/202222/02/2023Posted in5G, GNSS, PNT, raspberry pi, tech, telecom, workTags:electronics, esp32, GNSS, NTP, pi pico, raspberry pi, tech, usb-rtcLeave a comment on Tiny clock party – it’s not always about nanoseconds…

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.

Posted byzedstarr20/09/202219/12/2022Posted inPBX, sdr, tech, telecomTags:1G, electronics, maker, sdr, tacs, tech1 Comment on Old Meets New: Analog (1G) TACS Cellphone meets Lime SDR

Phoney – Psion Series 3a spoof voice calling from 1996

An app written in 1996 to simulate making voice calls from a Psion Series 3a.

Posted byzedstarr23/08/202213/12/2022Posted inpsion, tech, telecomTags:eopc16, opl, psion, retro-computers, retro-computing, sibo, tech, telecomLeave a comment on Phoney – Psion Series 3a spoof voice calling from 1996

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.

Posted byzedstarr25/05/202220/09/2022Posted in5G, PNT, sdr, tech, telecom, Uncategorized, workTags:electronics, techLeave a comment on One of The Many Promises of 5G – Accurate Time Transfer

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…

Posted byzedstarr15/02/202220/12/2022Posted inPBX, raspberry pi, tech, telecom, voipTags:PBX, raspberry pi, SIP, tech, voip3 Comments on A SIP trip down memory lane… back to Asterisk PBX & VOIP

MCMF – MF4 dialling for the Psion MC400

Adding MF4 (DTMF) dialling capabilities to the legendary Psion MC400 laptop from 1990

Posted byzedstarr19/04/202124/02/2023Posted inpsion, tech, telecomTags:dtmf, epoc, mc400, mf4, psion, retro, retro-computers, retro-computing, sibo, telecom4 Comments on MCMF – MF4 dialling for the Psion MC400

Reviving a relic – a time machine from the past – the Enhanced Waveform Generator

Reviving some 1990s era tech …

Posted byzedstarr24/03/202120/09/2022Posted intech, telecom, workTags:electronics, maker, tech, telecomLeave a comment on Reviving a relic – a time machine from the past – the Enhanced Waveform Generator

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