Radio set No 11 power supply leads.

[Chris Suslowicz]

Originally Posted by Mike Kelly

Kevin

I see you have the large isolating capacitor on the frame itself - a very important item to have in a vehicle equipped with a mobile wireless set .

Case in point. During the 1950's floods in the Hunter Valley NSW , the army had a few DUKW's rescuing people . Sadly at least one or more of the signallers in a DUKW was electrocuted when the antenna of their wireless set hit a HV power line . Mike

Unfortunately that capacitor won't protect you against high voltage lines. It's there to protect the set (particularly the aerial current metering circuits) from low voltage overhead distribution lines (trams, trolley buses, and domestic feeders) that a whip aerial is likely to make contact with. It won't protect against the medium voltage (11kV or 33kV used in England, other countries may vary), since the capacitor is only rated at 5kV DC.

(The WS19 variometer has a similar capacitor built in, but the Aerial Tuning Inductance No.1 or Aerial Coupling Unit 'J' used with the RF amplifier (for WS19HP) do not, and are used with an external capacitor to protect the metering circuitry.)