There are some good alternatives to krytrons. Just don't expect to be able to afford or export them. ;)
> On Dec 26, 2013, at 21:26, Bob Camp <li...@rtty.us> wrote: > > Hi > > Unless you want run for < 1 second, that rules out a Krytron. > > Length of operation also impacts some of the other implementations. > > Bob > >> On Dec 26, 2013, at 9:16 PM, ct1dmk <ct1...@gmail.com> wrote: >> >> Many thanks to all for the nice tips. >> >> I may narrow down by saying a few more specs as suggested. >> The pulse would see a somehow unknown load but for a start I >> was suggested to have my source with 50ohm impedance so worst >> case would be a short circuit and therefore the pulse would be a current >> pulse >> and would have some 10Amp. Pulse length about 100ns so only some 0.5mJ >> energy that would die inside the pulse source( this would be the worst case). >> The 100us repetition rate make a a very small duty cycle of 1/1000 so >> average power >> maximum 5W. >> >> Since the amplitude and timing parameters are to be controlled (pulse timing >> come from an FPGA) I really need a solution using that trivial switching >> element fet or bipolar (and can't really do a more exotic scheme if I cant >> electronically control the parameters) also I must use a transformer because >> these short pulse are to be superimposed to another voltage and a >> transformer becomes very handy to do that. I interrupt the wire and insert >> the secondary there to add the pulses. >> >> The challenge I'm facing is on the device either RF FET or Biplolar tr etc. >> and >> surrounding circuits, transformer, etc. this to achieve the 4ns (or 5ns). >> (the transformer I have in mind is something very similar to those >> transformers >> on the final stages of HF/VHF ham radio amps, coax cables and ferrite cores) >> any suggestion regarding devices etc ?... >> >> Thanks for all comments. >> >> Luis Cupido. >> _______________________________________________ >> 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.
