I think my point was, we haven't always been so sophisticated either. Wes Hayward's article on toroids in Jan 1968 QST discusses the Indiana General sales policy to hams, then says "The remainder of this discussion will show the experimenter how he can fabricate his own toroid cores from familiar components that can be found in most junk boxes.". Then discusses how to start with ferrite loopsticks, a saw, and a drill, and make your own toroids, or how to use tuning slugs or cup cores from IF transformers or TV convergence assemblies as toroids.
Now me, in my lab, if it is anything other than 43 mix, I try to write the part number/mix on it with a Sharpie when I get the package from Amidon or other supplier. Some suppliers use plastic stickers on the bag to identify what's inside... but if I wait too long in summer weather, the sticker falls off! So no shortage of UFO's here :-) Tim N3QE -----Original Message----- From: ZR [mailto:[email protected]] Sent: Tuesday, July 03, 2012 4:35 PM To: Shoppa, Tim; [email protected] Subject: Re: Topband: UFOs What do you mean 3rd world? That describes the majority of the USA, present company excepted, but here they throw in a TV or monitor flyback! Carl KM1H ----- Original Message ----- From: "Shoppa, Tim" <[email protected]> To: <[email protected]> Sent: Tuesday, July 03, 2012 3:11 PM Subject: Re: Topband: UFOs > There are parts of the third world where ham homebrewing is based around > three standard toroids: "the one from a TV 75/300 balun", "the yellow one > from a PC power supply", and "the green one from a PC power supply". > > And here we b&m that we don't have u' and u'' curves. > > Tim N3QE > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1424 / Virus Database: 2437/5108 - Release Date: 07/03/12 > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
