Ian Our friends over the pond (K9YC etc) extoll the virtues of type 31 material
but I have yet to see this in European stocks, (I was disappointed to see none at Friedsn) do you know of an easy source? Reading through your latest choke missive, I notice that nice obround shaped core from Farnell but looking up the Fair-Rite catalogue I notice they have a slotted version made for multiple cable entry: 2643165151 which would lend itself even more to the quest for low capacitance between turns. Can you see anything against this? What is going through my mind is how the amateur fraternity could persuade a distributor in EU to stock these and the type 31 cores. Further to your careful layout within the core, I'm sure I've seen a guide that would help to keep things in order - I think it's a plumbing part, I will continue to look. I think mounting the chokes on a piece of ply with clamps would give it rigidity and an easy mounting method. Ready-made cables would make these chokes very easy to put together but the nice microwave ones I bought surplus recently have mostly N type connectors: another reason for that slotted type of core. I haven't seen measurements done on a solenoid coil of coax which is very easy to do using up surplus lying around. If the turns are slightly separated, that should help with self-capacitance. 73 David G3UNA > Follow the link below for a reasonably short summary, and then go on to > read Jim's much longer treatise: > http://www.ifwtech.co.uk/g3sek/in-prac/inpr1005_ext_v1.pdf > > -- > > 73 from Ian GM3SEK > http://www.ifwtech.co.uk/g3sek ______________________________________________________________ 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
