Hi Finding the RF transformer parts is still a bit of a challenge.
Bob > On Nov 27, 2014, at 4:21 PM, Joseph Gray <jg...@zianet.com> wrote: > > Mouser carries a selection from Fair-Rite. They don't make it easy to > find a specific part number, however. > > http://www.mouser.com/Fair-Rite/Passive-Components/EMI-RFI-Components/EMI-RFI-Suppressors-Ferrites/Ferrite-Toroids-Ferrite-Rings/_/N-bw7t9?P=1z13m3cZ1yxh9di > > Joe Gray > W5JG > > > On Thu, Nov 27, 2014 at 11:34 AM, Tim Shoppa <tsho...@gmail.com> wrote: >> Again I refer you to Clifton Labs website and cross-references there to the >> Fair-Rite part numbers/mixes. Although the marketing largely emphasizes EMI >> suppression, all the mainline distributors now offer several mixes and core >> styles that are perfect for RF transformers. >> >> Powdered iron, yeah, those are not so easily found at mainline >> distributors, I end up getting them from kitsandparts.com or Amidon. >> >> And to Jim's point... "build your own" MMIC from discrete RF transistors >> (often different generations of CATV-oriented transistors - you get the >> advantage that you get tune bias currents etc. for individual need) is >> quite easy using parts stocked at Mouser etc. They also have these >> impressive super-beefy broadband CATV distribution/isolation amplifiers. >> >> Tim N3QE >> >> On Thu, Nov 27, 2014 at 12:49 PM, Bob Camp <kb...@n1k.org> wrote: >> >>> Hi >>> >>> At least last time I looked, the "easy to find" distributors had great >>> selections of parts used for switching power supplies and EMI suppression. >>> When you started to dig for the specialized parts for RF transformers and >>> tuned filters, the stock was pretty thin to nonexistent. If you move from >>> ferrite to powdered iron, the search process alway has been more >>> difficult... >>> >>> Bob >>> >>>> On Nov 27, 2014, at 11:09 AM, Tim Shoppa <tsho...@gmail.com> wrote: >>>> >>>> On Thu, Nov 27, 2014 at 10:28 AM, Bob Camp <kb...@n1k.org> wrote: >>>> >>>>> The main complaint is the difficulty of getting the correct cores. I >>> seem >>>>> to have a few dozen bags of cores. >>>> >>>> >>>> The mainline distributors (Allied, Newark, Mouser, etc.) have excellent >>>> selection of Fair-Rite and other cores. Admittedly to a neophyte the >>>> equivalence of Fair-Rite or Laird part numbers to an Amidon-style number >>>> may not be evident. >>>> >>>> Clifton labs has excellent webpages of examples and is also a good way to >>>> find the cores sizes and materials commonly stocked at the mainline >>>> distributors using the manufacturer's part number (often with cross-ref >>> to >>>> Amidon style number as a strong hint!) >>>> >>>> Recently some here expressed concern that the mini-circuits part may >>>> saturate with medium DC currents. Of course if you are doing a SMT >>>> production run you don't want to use bigger cores than necessary and most >>>> of the mini-circuits parts tend to be physically very tiny to meet this >>>> market. But if you wind your own on bigger cores this is a non-issue. >>>> >>>> Tim N3QE >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.