From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Methods for screening against wireless radio interference in vehicles.
| Identifier | ExFiles\Box 163\2\ img012 | |
| Date | 17th November 1932 | |
| S/W. Hs.{Lord Ernest Hives - Chair}.....from PN.{Mr Northey} WST V-6008 PN.{Mr Northey}1/WT17.11.32. Screening for Wireless. Will you please cancel memo PN{Mr Northey}2/WT16.11.32 and substitute the following. When discussing with you at W. on Monday the steps which it had been effective to take in connection with military tanks to prevent interference of the wireless by sundry electrical features on our engine equipment, I omitted to ask you if you knew what steps were being taken also to screen any dynamo there might be on board, whether the machine was placed in a metal box, and/or, a capacity was fixed across the brushes? The case arises specifically out of the desire of one of our owners to fit to his new car a radio receiving set, and I have already indicated that we should be unwilling to agree to certain propositions which have been made such as fitting 50,000 ohms units of resistance in series with each sparking plug, and a condenser between the earth terminal of the dynamo and the frame. PN.{Mr Northey} RECEIVED 17 NOV | ||