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).
The efficiency of various car aerial types and a failure report for a radio unit.
| Identifier | ExFiles\Box 168b\1\ img274 | |
| Date | 6th May 1938 guessed | |
| -2- Efficiency of Aerials. There have been four types of aerials fitted to various cars, namely: 1) Running board type. 2) Underslung chassis type. 3) Telescopic type. 4) Roof type. The following results have been obtained with each individual aerial: 1) The running board type is now practically useless on account of the body design of the cars, and from the point of view of signal strength the results were the most unsatisfactory. 2) The underslung chassis type is the most efficient for signal strength, but suffers the most from engine interference. 3) The telescopic aerial is about midway between the above-mentioned types as regards signal strength and engine interference. 4) The roof aerial is the best type yet fitted, - the signal strength is very nearly as good as that obtained with the underslung type, its greatest feature is that it suffers from practically no engine interference, this is due to the position that it is mounted in. --------------- REPORT OF FAILURE OF RADIO ON 4-B-30. The receiver was reported to be working very badly. On examination it was discovered that the instrument had developed a very bad crackle accompanied by a fade out of signals. The unit was removed from the car, and on examination it was found that the lead to the oscillator anode of the 6A8b valve had been inserted in the eyhole of the soldering tag but had not been soldered. This was rectified and the trouble removed. This fault was obviously due to the manufacturers. --------------- | ||