Collins 490T-1

COLLINS 490T-1 AUTOMATIC ANTENNA TUNER

Revision 1: February 2010

Updated 115 V / 400 Hz supply June 2010

Revision 2: April 2018

By Dominique F1FRV

This automatic antenna tuner (~ 50 years old) is made for 2-30 MHz. Defined by COLLINS for 650 Watts PEP CCS (Continuous Commercial Service) -55 to +55 °C @ 30 000 feet or 9144 meters ASL. It can be safely used up-to ~1 kW PEP ICAS (Intermitent Commercial & Amateur Service) 1.8 to 30 MHz at lower altitude and moderate ambiant temperature.

RF minimum power requirement for tuning is ~ 20 to 40 Watts.

Power supply needed is 115 V / 400 Hz ~ 65 VA (100 VA peak). If you dont have a 115 V 400 Hz supply, it is possible to make one. See in downloads.

You will need also a (J1) 16-26 female connector & an input (J2) "C" male connector or adapter.

Some pictures