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).
Letter from E.K. Cole Ltd (EKCO) regarding suppression condensers for reducing radio interference in Rolls Royce and Bentley vehicles.
| Identifier | ExFiles\Box 63\3\ scan0338 | |
| Date | 23th April 1935 | |
| W. S. VERRELLS Chairman & Managing Director E.{Mr Elliott - Chief Engineer} K.{Mr Kilner} COLE Sub-Managing Director E.{Mr Elliott - Chief Engineer} R.{Sir Henry Royce} PRING R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} CORNWALL Directors EKCO ALL-ELECTRIC and BATTERY RADIO TELEGRAMS EKCO SOUTHEND-ON-SEA TELEPHONE SOUTHEND 49491 8 Lines 76153 RIC/JP E.{Mr Elliott - Chief Engineer} K.{Mr Kilner} COLE LTD EKCO WORKS SOUTHEND-ON-SEA 23rd April 1935. Your Ref: Hs{Lord Ernest Hives - Chair}/Wst.8/MA. Rolls Royce Ltd., DERBY. For the attention of Mr. West. Dear Sirs, In reply to your letter of the 8th inst., regarding suppression condensers for Rolls Royce and Bentley chassis, we have been endeavouring to obtain some condensers exactly to your specification to try them out, but have not yet received these. We believe, however, that they will meet our general requirements. Since you were down here we have carried out the installation of which I spoke to you on a new Bentley for Mr. E.{Mr Elliott - Chief Engineer} K.{Mr Kilner} Cole. Complete suppression was obtained with a set of low value suppressors and four condensers similar to those you describe only. One condenser on the dynamo, one on the windscreen wiper, one on the ignition L.T. feed and one on the petrol pump. No suppression was fitted to the voltage regulator. Two alternative types of condenser are being sent to you for your approval. They are the same mechanically, but one type (Part No. A4752) is a 25-mfd capacity electrolytic, the other (Part No. A4861) a .1mfd capacity paper. The electrolytic is sometimes more effective in eliminating dynamo and windscreen wiper interference. As we mentioned in conversation, it is sometimes necessary to fit one or more condensers to the interior body wiring circuits or the main battery terminal at the fuse box, to prevent ignition interference being conveyed from below the bonnet into the body and so being re-radiated into the aerial. Where it is necessary to attach more than one condenser to the IMPORTANT NOTICE "LIMITED LICENCE" "Ekco products are patented and are supplied upon condition that the recipient accepts a licence under the patents and agrees to sell only at the prices fixed by the Makers. Violation of this by anyone renders him liable for damages." | ||