Hi, Lee, LF I have found that the core material used for the output transformer and feedpoint choke isn't too critical in push-pull FET transmitters like the G0MRF and other designs. I've used a vari
Yes, 3F3 is even better than 3C85/3C90 for power transformation at a few hundred kHz. The 3F3 cores, if coloured, are light blue. Philips sold their ferrite business to Ferroxcube: http://www.ferroxc
Lee, I think the 3C85s were made by Philips and I susppect they have sold of that line look under Neosid, and Epcos (though my link to the latter does not seem to work now, but it is a couple of year
I forgot to mention one important thing in my last reply: and T200-2 cores were suggested as alternatives to the 3C85/3C90. The mixes #2 and #3 are powder iron, not ferrite as the 3F3 and 3C85/3C90.
Hello! Have a look at Ferroxcube (Philips) cores of 3F3 material. As far as I can interpret datasheets for these, they should work fairly well as transformers up to 500kHz with a DC component and up
W1VD and I have used Micrometals iron powder type 2 cores in low pass filters at 137 and 505 kHz. I had trouble with heating on type 3 cores, but the greater number of turns needed for the type 2 fix
Hi folks, In my 137 kHz tx I also had an output filter. Trying to use all kind of ferrites I noticed that they normally get rather warm (or hot with the wrong type of ferrite) if I used it for some l
Yes that's correct. The Txxx is a size designation, -2 is iron powder mix 2, suited for MF to low HF. For SMPSU / LF transformers Siemens N80 material is a substitute for 3C85 / 3C90.(hope I've remem
