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The racal ra17 radio receiver provided a revolutionary improvement in performance when it was first introduced using a new scheme called the wadley loop the racal ra17 virtually eliminated frequency drift a problem that had dogged all previous radios. The communications receiver type ra17 has been designed for use as a general purpose receiver which will provide a high order of sensitivity selectivity and stability the receiver covers a frequency range from 10 to 300 mc s and extending with slightly degraded performance down to 500 kc s. Racal ra17l government communications receiver power 110 or 240 volts 50 60hz wavebands continuously tuneable from 500khz to 30mhz sensitivity quoted for voice as 1uv 18db s n ratio incredible valve lineup triple conversion superhet circuit comprising 24 tubes ef91 ecc189 e180f 6f33 6be6w gz34 . The racal ra17 used a wadley loop circuit which was able to eliminate drift and this gave it a significant technical advantage over other communications receivers of the time the ra17 circuit was nevertheless complicated and utilised a total of 23 valves tubes but performance in terms of spurious responses was still very good. Download racal ra17 05 30mhz communications receiver 1954 sm service manual repair info for electronics experts service manuals schematics eproms for electrical technicians this site helps you to save the earth from electronic waste