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).
Using a suppressor in a car's ignition system to reduce radio and television interference.
| Identifier | ExFiles\Box 27\3\ Scan065 | |
| Date | 29th March 1939 | |
| R.R. 306. ST.{Capt. P. R. Strong} 74907/4/11/38. C.E. 1204 EXPERIMENTAL DEPARTMENT REPORT. REFERENCE:- Lr{Mr Ellor}/HWS/SGL.1/WJ.29.3.39. Subject of Report:- RADIO INTERFERENCE FROM CAR IGNITION SYSTEM. EFFECT OF SUPPRESSOR IN COIL H.T. LEAD. General Conclusion:- Comparative measurements of the interference have been made, working at broadcast and television wavelengths, to show the effect of the suppressor. It appears from the results given, that the interference at both wavelengths is reduced sufficiently and that a suitable value for the suppressor would be 5000 ohms. Lr{Mr Ellor}/HWS/SGL. Att. photographs. Copies of Report Circulated to:- Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/RC.{R. Childs} Report to be noted for further action by:- Test carried out on:- Buick 8. By:- Lr{Mr Ellor}/HWS/SGL. Test No. Date:- | ||