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![]() "Michael Black" wrote in message ample.org... On Tue, 5 Aug 2008, Tio Pedro wrote: There were plenty of articles about using the other but cheaper tubes similar to the 7360. But I'm not certain any I saw used them as a first mixer. One could go back and check. And if that's the case, either everyone just copied Squires 1963 article, or there actually was a good reason to not use the cheaper variants for the first mixer. MIchael VE2BVW Hi Micheal Most of the magic seems to be being able to generate push-pull LO injection for the deflection plates, that along with the P-P output tank balance, is critical for max. signal rejection at the mixer output. I do have a 1600kHz daytimer next town over (1st IF is1600 kc.) I was thinking of using a trifiliar wound balun, driven by a cathode follower buffer of off the first LO, to provide the 3 volt RMS injection to the deflection plates. That should provide balanced drive voltages to each deflection electrode? Squires never provided a lot of detail on his coils or how they were made. A balun might provide a modern solution for balanced P-P injection from otherwise single ended LO sources. Pete |
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