I think you’ll find in the release notes that main/sub filters no longer need to be matched.
However, I think I’d be happier with two alike, either 2 8-poles or 2 6-poles. Sent from my iPhone ...nr4c. bill > On Jan 14, 2020, at 7:18 AM, Clay Autery <[email protected]> wrote: > > The 400Hz filter on my Main RX is an Elecraft (by INRAD) 8-pole filter in a > Faraday cage and no offset. > The 400Hz filter I just received for my SubRX is an Elecraft (by Vibroplex?) > that is a 6-pole filter with no Farady cage AND it has a -0.71 kHz offset. > > I called support when I saw the obvious differences, and they said, "Don't > worry about it. Enter the SubRX offset exactly as on the crystal (no > averaging with the [supposed] 0.00 offset on the 8-pole filter), and let the > new Synthesizers do the heavy lifting." or words to that effect. > > I hear what was said, and I don't want to come off like I don't trust what I > was told.... But something simply is not sitting right with me on this.... a > 6-pole "matched" with an 8-pole? No offset averaging? What about the > difference in the skirts between a 6-pole and an 8-pole.... Aren't the > cutoffs and cutoff rates different? I realize that things change, and that > perhaps the instructions for averaging the offsets is not applicable here... > (though I don't yet understand why) > > Can someone clear this up for me so even I can understand it. > > Seems to me that I either need to get a matching INRAD-made 8-pole, or buy > another of these new parts and try to get it matched. > > Want to move on this, because IF I am going to have a hope in getting a > "matching" 6-pole (new stock) 400 Hz filter, I need to try and do so from > within the same batch that the one I just bought came from. > The prospect of finding an "by INRAD" 8-pole available on the market seems > much less likely... > > Obviously, I am operating on a number of assumptions here... which is why I > am asking... > > > 73 > > ______________________ > Clay Autery, KY5G > (318) 518-1389 > > ______________________________________________________________ > 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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
