You misunderstood Paul. It think we're in full agreement. The top end receivers (I had an HRO-5) were expensive and mechanically complex to provide tracking, tunable input filtering.
What you quoted from my post was that I said it was cheaper to skip that sort of complexity in favor of a fixed-tuned ham-band-only input filter. And, by going to fixed tuned input filters, actually improve the Ham band performance - especially when compared with the performance of most of the lower cost receivers commonly used by Hams. Dropping the multi-section tuning caps resulted in a great mechanical simplification too. Just a guess, but doubt that the multiple-stage tuned input filters in my HRO were as good as a good fixed tuned filter - especially when considering the ultimate rejection of very strong signals far from the desired frequency. Note that I was speaking of RF input filtering to avoid overload, not dial calibration or tuning stability. My HRO was quite good (but I never switched the filaments off :-) and the Collins PTOs were outstanding. I had occasion to rebuild a number of those for Lockheed - they were quite an impressive electrical and mechanical design. 73, Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Paul Christensen Sent: Sunday, October 23, 2011 12:49 PM To: [email protected] Subject: Re: [Elecraft] KX3 vs FT817 - how do the "insidedimensions" compare? > "I had the impression that the rise of the Ham-band-only transceiver in > the > 1950's and 60's was based on simple economics. It was cheaper to drop > general coverage receive..." Just the opposite, I think. Some of the poorest performing -- and least expensive receivers provided general coverage. The most expensive receivers of their respective eras were the Collins 75A, Collins 75S, Drake R-4, and National HRO, all of which were at the top-end of the purchasing ladder in their day... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
