Re: Topband: UFOs
Don't knock those deflection yoke cores! :-) I've used a lot of those for RFI suppression over the years, especially the last place I worked. They started calling me a "wizard" there after a simple trifilar winding of #10 THHN around one of those ferrite cores allowed their CNC machine tool equipment to be operated at the same time someone was using a heliarc welder. 73, Mike www.w0btu.com On Tue, Jul 3, 2012 at 3:35 PM, ZR wrote: > 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! ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: UFOs
Id forgotten Indiana General and their famous Q-1 cores, that was my first attempt at Beverage matchingseems eons ago. OTOH, Hayward was 44 years younger and a bit of a frugal type in keeping with QST tradition. Whatever worked was good, no matter what, and test equipment was very scarce AND expensive if you wanted something decent. Amidon has a long list of their suppliers and many Ive never heard of or took the time to look at. Carl KM1H - Original Message - From: "Shoppa, Tim" To: "ZR" ; Sent: Tuesday, July 03, 2012 4:49 PM Subject: RE: Topband: UFOs 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:z...@jeremy.mv.com] Sent: Tuesday, July 03, 2012 4:35 PM To: Shoppa, Tim; topband@contesting.com 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" To: 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 > - 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
Re: Topband: UFOs
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:z...@jeremy.mv.com] Sent: Tuesday, July 03, 2012 4:35 PM To: Shoppa, Tim; topband@contesting.com 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" To: 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
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" To: 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
Re: Topband: UFOs
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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
Re: Topband: UFOs
At a hamfest years ago I saw some UFO's on a table. Me: "What kind are they?" Vendor:"I don't know, what's best?" Me: "People seem to like type 43 for HF/VHF and 31 for MF/HF suppression." Next time I walk by the table, all of the UFOs were miraculously identified and labelled. Why, he even had both 43 and 31 types in his offerings. Son of a gun! 73, Kirk K4RO On 7/3/2012 11:39 AM, Hal Kennedy wrote: > Has anyone ever seen or can point us to a decent treatise on identifying > UFOs? That would be: Unidentified Ferrite Objects. > > Yes, I can throw a few turns on a UFO and sweep it and zero in on the > material, maybe make an educated guess at that point as to the manufacturer, > check his data sheets for a match and data sheet (unless its Laird) and to > be honest, as skilled and test equipment-rich as I am in this area I would > not feel comfortable having gone through that rather laborious process that > I really knew what I had. > > There must be a google of UFOs for sale at hamfests and surplus houses - > never getting bought or used since we can't ID them. Anybody want to design > up a UFO tester? > > Hal > N4GG > Happy 4th > > > > > ___ > UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK