Maybe start here: http://www.globar.com/
Tom K3TVC ----- Original Message ----- From: "Phil LaMarche" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" <[email protected]> Sent: Monday, May 19, 2008 2:02 PM Subject: RE: [AMRadio] Dummy Load > > Can anyone advise where to purchase the Glo-Bar resistors. > > Phil > > > Philip LaMarche > LaMarche Enterprises, Inc. > www.instantgourmetspices.com > www.w9dvm.com > 800-395-7795 pin 02 > 727-944-3226 > FAX 727-937-8834 > NASFT 30210 > W9DVM > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of D. Chester > Sent: Monday, May 19, 2008 1:08 PM > To: [email protected] > Subject: Re: [AMRadio] Dummy Load > > >>I made a mistake about 35 years ago buying some "non-inductive > >>resistors for a dummy load. The only place they were non-inductive was > >>at 60 Hz. The carborundums are not in the category. > >> Joe W4AAB > > I use a bank of a dozen 600-ohm 150w "Glo-bar" carborundum resistors to > achieve a 50-ohm dummy load rated 1800 watts continuous duty air-cooled. > > I once picked up some so-called noninductive resistors that were wirewound > in two layers wired in parallel, with the wire of one layer wound in > opposite direction of the other layer. They would not work in a dummy load > without a series variable capacitor to tune out the reactance. I suspect > that type of resistor, which may be satisfactory for the AM broadcast, might > have substantial inductive reactance on the HF amateur bands. With the > capacitor, mine worked OK. I doubt if an ordinary wirewound resistor could > be made to work satisfactorily, since it would behave more like an rf choke > than a resistor at those frequencies. > > Don k4kyv > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/[email protected]/ > List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: > http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > To unsubscribe, send an email to [EMAIL PROTECTED] with the > word unsubscribe in the message body. > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/[email protected]/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. > > > > -- > No virus found in this incoming message. > Checked by AVG. > Version: 7.5.519 / Virus Database: 269.23.20/1453 - Release Date: 5/18/2008 9:31 AM > > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
