Thanks to Jon VE1FTL I have the following interesting details on the system at CFH. Jon says it is a Canadian Naval site and gives the location as Newport Corner. The transmitter is aging valve unit,
And thanks to you, Alan, for finding the informations. Please ask VE1FTL for the exact nominal QRG of the transmitter. At least, we have a positive ID for the signal ! (is the old tube TX available