Hello Dave, Thank you for all those measurement results. For the ceramic caps, I already mentioned that some ceramic caps (especially the NPO ones) can be as good as the SM ones, but some made of different ceramic grades are really worse, to the point that a given one prevented the 17MHz xtal oscillator stage to drive the R-390A first mixer with sufficient amplitude. And this was the starting point for this topic. I believe that Larry recommendation is: use a SM replacement cap where mica ones are used in the R-390A, unless you can measure that a ceramic replacement is good enough for the task.
73, Jacques, VE2JFE in Montreal ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 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
