SPECIFICATIONS:

Type : TRF receiver
Frequency range: 500 KHz only
Modes: CW and MCW
Mains Power input - ?
Weight - ?
Dimensions - 97cm H x 35cm W x 31cm D.
Comment: This was a 500 KHz receiver to detect any ship which transmitted distress alarm  using an autokeyer. It would ring a bell upon the receipt of an emergency alarm which consisted of 12, spaced, long dashes.

It was superseded by the Safeguard auto alarm.

Vigilant photo courtesy E-bay.com

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Contributors and Credits:

1) http://www.rnmuseumradarandcommunications2006.org.uk/MERCHANT%20SHIPS%20AND%20RFA%20FITS.pdf
2) http://www.shipsnostalgia.com/archive/index.php?t-44509.html
 

Oct15/12