AirBorn Electronics 1990s projects


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AirBorn Electronics Project Work

These projects date from the 1990's
Newer projects are here

ChngRF1: Link Authentication Unit

Link Authentication Unit - Challenge/response type
Can Authenticate over RF Link
Gold Plated contact DB25 connectors
Plugpack powered

485hub1: RS485 Active Hub (5 port)

5 signal buffered party line data ports
Industrial grade pluggable wiring block connectors
Handles all NRZ protocols (Protocol independent)
Plugpack or 12v supply

485hub1: Technical documentation

ChngSMT1: DB25 to DB25 full duplex serial protocol converter, signal powered

Serial Protocol converter
Gold Plated DB25 connectors
Miniature, In-line
Normally placed between PC and Modem
RS232 signal powered
Custom programmed to clients protocol conversion requirements

AntSpik1: RS232 Anti-spike

Protects against spikes on RS232 COMs lines
Miniature, In-Line, DB25
6ns, 6kv ESD SCR clamps
Protects pins 1-8,20,22
Fusible MetFilm resistors

RS232 surge protectors are available commercially from most computer retailers. However, these rather inferior devices usually contain just two metal oxide varistors from the RS232 data lines to ground. In the event of a high voltage, the cheap protectors divert the surge current through the ground of the computer (without limiting it) and even then they do not isolate the source of the surge from the computer RS232 data lines.

In Contrast AntSpik1 protects all the PC RS232 lines and limits the current surge through fusible metfilm series resistors. Should the surge be too great, the metfilm resistors blow open circuit, protecting the equipment. The current flowing into the computer ground is limited. Any surge voltages are clamped very quickly using SCR clamp devices. AntSpik1 is probably the best surge protection you can buy that can be placed in-line with the equipment in a standard DB25 enclosure.

LiteKey1: Light coded key

Pulse Code Modulated Green light key
Key number in EEPROM
Miniature keyfob case
Field programmable
3v Battery operation

The Light key has the advantage that an IR learning remote cannot be used (in unmodified form) to steal the pass number of a borrowed key and thus gain unauthorised access.