70cm QRM

A friend of mine in Cambridge Richard G3TFX is getting QRM on the GB3OV repeater. OFCOM cannot help.

He writes:

Can anyone pin down the direction of a pulsing telemetry signal causing QRM on the OUTPUT channel of the St Neots repeater GB3OV, 433.125 Mhz? It's a pretty strong signal in the center of Cambridge and my guess is it might be a device on a crane.