Re: [Elecraft] What technical similarity do HRO receivers and Elecraft receivers share that is unique? - Answer
The Hallicrafters SX-73 used three selectable fixed very low value resistors to alter the Q and hence, the passband of three IF stages. Does this qualify? 73, Charlie k3ICH If you happen to own one, I'd strongly suggest checking these resistors. I have two radios in for restoration, where the resistors were off by as much as a factor of 3 which completely screwed up the alignment. -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Doug Millar via Elecraft Sent: Sunday, September 03, 2017 8:46 PM To: Elecraft Reflector <elecraft@mailman.qth.net> Subject: [Elecraft] What technical similarity do HRO receivers and Elecraft receivers share that is unique? - Answer Hi Don and others- Ok.Here is my answer- I don't think I am far off by saying that the unique similarity it is in using switched components to effect frequency coverage of the same tuning coil. In the HRO they had clips you could change over to go to "bandspread" mode on each coil assembly, Elecraft uses relays (switches) to change capacitor values in their bandpass filters so that the same assembly can cover two ranges. Essentially the same thing. I don't think any other companies have used this technique as extensively as National and Elecraft. Your opinion may vary.Doug Dr.Doug Millar EdD. K6JEY drzarko...@yahoo.com 562 810 3989 cell/text __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to pin...@erols.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] What technical similarity do HRO receivers and Elecraft receivers share that is unique? - Answer
In the HRO-7 coil sets (that I had) they were screws that changed the connections. It was a fun thought experiment for those of us who had HRO receivers. I miss my HRO but mine came to me from W6HUA - Field Gray who was Jack Webb's art direction on the original Dragnet TV shows and well as the feature length movies "The DI" and "Pete Kelly's Blues"). I met Field on 80 meters and he said he'd sell me his HRO IF I promised that if I needed the cash back he'd buy it from me. In College that happened and he took it back for the $100 I paid for it (about $15 in today's money). I was just starting college and some months later he left it at my Mother's home. I then found out he had become an SK from cancer. Decades later another young fellow used to spend hours in my shack listening to it. Eventually I turned it over to him, no charge because that is what I paid, with the same conditions. That made it a great receiver, no matter how good it was or was not by today's standards. That's the Ham radio I grew up in. Most gear was passed onto the next generation with no idea of profit. The price we paid was what it was worth to us for the enjoyment we gained from it. 73, Ron AC7AC -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Doug Millar via Elecraft Sent: Sunday, September 3, 2017 5:46 PM To: Elecraft Reflector Subject: [Elecraft] What technical similarity do HRO receivers and Elecraft receivers share that is unique? - Answer Hi Don and others- Ok.Here is my answer- I don't think I am far off by saying that the unique similarity it is in using switched components to effect frequency coverage of the same tuning coil. In the HRO they had clips you could change over to go to "bandspread" mode on each coil assembly, Elecraft uses relays (switches) to change capacitor values in their bandpass filters so that the same assembly can cover two ranges. Essentially the same thing. I don't think any other companies have used this technique as extensively as National and Elecraft. Your opinion may vary.Doug Dr.Doug Millar EdD. K6JEY drzarko...@yahoo.com 562 810 3989 cell/text __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to r...@elecraft.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] What technical similarity do HRO receivers and Elecraft receivers share that is unique? - Answer
Hi Don and others- Ok.Here is my answer- I don't think I am far off by saying that the unique similarity it is in using switched components to effect frequency coverage of the same tuning coil. In the HRO they had clips you could change over to go to "bandspread" mode on each coil assembly, Elecraft uses relays (switches) to change capacitor values in their bandpass filters so that the same assembly can cover two ranges. Essentially the same thing. I don't think any other companies have used this technique as extensively as National and Elecraft. Your opinion may vary. Doug Dr.Doug Millar EdD. K6JEY drzarko...@yahoo.com 562 810 3989 cell/text __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
