Stuphedd Posted November 22, 2020 Share Posted November 22, 2020 Going through my old stuff , I have come across a Heathkit manual which must be about 1970 , not got any of the radio left but if its any use to anybody , shout out !! cheers Quote Link to comment Share on other sites More sharing options...
Geoff S Posted November 22, 2020 Share Posted November 22, 2020 Heathkit? That brings back memories. I built a Heathkit FM tuner and a remote anemometer/wing direction indicator for the sailing club years ago. I wasn't interested in radio control then but I don't recall one at the time. Presumably it was 35Mhz? Or even 27Mhz? Two work colleagues designed a phase-locked-loop stereo decoder which was published in Wireless World and I fitted one to the Heathkit FM tuner replacing the one using an analogue sytem. They tried to interest Plessey in the design but it was rejected ... then some months later they produced an integrated circuit decoder using the same principle. Geoff Quote Link to comment Share on other sites More sharing options...
John Lee Posted November 22, 2020 Share Posted November 22, 2020 Here's the review from the Oct 1968 edition of the RCM&E, it may be of interest to those who remember it & an education for those who don't. The price of £130-10s is the equivalent of £1,945 today for a 5 channel build-it-yourself outfit which rather puts in perspective the costs mentioned in a concurrent thread. Quote Link to comment Share on other sites More sharing options...
John Lee Posted November 22, 2020 Share Posted November 22, 2020 Quote Link to comment Share on other sites More sharing options...
Geoff S Posted November 22, 2020 Share Posted November 22, 2020 IIRC I was on about £1200 pa back then so £130.50 is certainly a big investment (and possible one reason all my spare cash went into motor cycles rather than RC back then - we'd just married!). At the time planar silicon transitors were taking over from germanium and the only integrated circuits I knew of were operational amplifiers (SGS muA702) and they cost about £30 a throw (and were notoriously unreliable because of some internal corrosion called purple plague). Things have moved on a lot in the last 50+ years. Geoff Quote Link to comment Share on other sites More sharing options...
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