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).
Instructions on suppressing electrical interference from ignition, dynamo, regulator, and brake systems.
| Identifier | ExFiles\Box 168b\1\ img271 | |
| Date | 6th May 1938 guessed | |
| Before these bonds are fitted make sure that all paint & rust is removed & that the surfaces are thoroughly cleaned, this is most essential. Ignition Suppressors on each sparking plug are now unnecessary due to the fact that there are filters fitted in most modern receivers, however, a resistor of 10,000 ohms is required in the main distributor lead, this should be mounted as close to the distributor head as possible. It is necessary to fit a 1 mfd. condenser between the battery or switch terminal of the ignition coil & earth, the best position for this condensor is to securely bolt it onto the metal bracket supporting the coil making sure that the surface is thoroughly cleaned beforehand. This is all the ignition suppression that is necessary. Dynamo & Regulator interference A 1 mfd. condensor should be securely earthed either to the chassis or to the dynamo casing. The other side of this condenser should be attached to the + terminal of the dynamo. This will as a rule eliminate any interference from this source. The voltage regulator is another source of interference generally recognisable when the battery is charging by a continuous crackle. If the bonding previously mentioned is properly carried out this interference should be hardly noticeable if not the best method of removing it is to fit a new aerial. Brake & Wheel Static Interference from this source may be recognised if on applying the brakes the interference is eliminated. | ||