But be aware the in contradiction to the above the core material is far more critical for use in low pass filters or any other resonant circuits. There the 'red' Amidon cores can be used. Or use air
My experience is that the core material is not so critical for a transformer. In my PA (450W out, variation of the G3YXM design) I use a 'double-U' core that was slaughtered from the HV transformer o
Hi all, Can anyone point me to any sources that will give me information on core mixes, properties and design criteria to assist me in realising output transformers for an LF PA? Data on the more eso
Hello group The old, but reliable, 3C85 series of toroids are now becoming difficult to find. As I'm still getting the odd enquiry or two, I've decided to re-stock some of the popular sizes but in th
An excellent technical magazine, the "Forum for Communications Experimenters", produced every six months by ARRL. See WWW.ARRL.ORG for more details. Andy What's 'QEX' Andy? Full details of this Tx wi
Thanks to all who responded, either via the reflector or direct. I will wait a few days to see if there is any more info and then mail a summary to the reflector. 73, Rik ON7YD I am trying to make a
For my 700 Watt transmitter I use an ETD49 core (approx 200mm^2 core area) of 3C85 material as the output transformer. This matches the 28 ohms output impedance from 12 turns on the primary, to a ran
Rik Strobbe schrieb: Hello LF group, I am trying to make a list of toroid core material that is suitable for 136kHz power applications, for impedance transformers and low-pass filters. I would apprec
Dear Rik, as my intention had been to design a transformerless PA, I have just two coils in the "peaked low-pass filter" (one coil with two T200-2 stacked because of higher reactive power in this par
Hello LF group, I am trying to make a list of toroid core material that is suitable for 136kHz power applications, for impedance transformers and low-pass filters. I would appreciate any information
