Hi,

If it is a UK SARBE unit made by Burndept, it probably uses a
super-regenrative receiver (i.e. self-oscillating detector) hence
the tendency to pull in frequency. They were designed as a
'downed-airman' distress beacon on 121.5 or 243MHz (usually with
a secondary non-distress channel), where the receive
specification doesn't need to be particularly high and with a low
battery consumption figure.

Horrible things, although I guess they will have saved a good
few lives in their time.


Cheers - Joe