That's what cable markers are for! Healthfully yours, DON W4BWS ----- Original Message ----- From: "Brett gazdzinski" <> To: "'Discussion of AM Radio'" <amradio@mailman.qth.net> Sent: Monday, January 09, 2006 5:55 PM Subject: RE: [AMRadio] Millen High Voltage Connectors
> What is wrong with ceramic feedthroughs? > > I don't think I like the idea of using RF connectors for high voltage, > what happens if you or someone else mix it up with RF antenna or output > stuff? > > Brett > N2DTS > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Ed Swynar > Sent: Monday, January 09, 2006 4:01 PM > To: Discussion of AM Radio; [EMAIL PROTECTED] > Subject: Re: [AMRadio] Millen High Voltage Connectors > > Hi Dave, > > I solved the problem of HV B+ arc-overs here by exclusively using NOTHING > but good-quality SO-239 coax receptacles, & RG-8 coax lines for the B+ > leads, terminated in good-quality PL-259's... > > Works like the proverbial charm --- have yet to encounter ANY arc-over > failures since adopting this approach universally at my station in the late > 70's... > > ~73~ Eddy VE3CUI - VE3XZ > > PS: Emphasis on the words "...good-quality" --- NONE OF THAT CHINESE JUNK > here!!! > > > > > > > ----- Original Message ----- > From: "david knepper" <[EMAIL PROTECTED]> > To: <amradio@mailman.qth.net>; <[EMAIL PROTECTED]> > Sent: Monday, January 09, 2006 3:50 PM > Subject: [AMRadio] Millen High Voltage Connectors > > > > My homebrew transmitter, designed by Stan, W3TGR now a silent key, is > > going through exhaustive and often frustrating testing. Stan used lots of > > shielded wire - you know the Belden stuff that is deteriorating over time > > with brittle insulation on the wire. I had to replace several leads > because > > the center conductor was shorting to ground when the insulation became > > brittle. So it goes ... > > > > Today, I thought that I had finally debugged the unit - pair of 813's > > modulated by 805's - but I heard the troubling sound of high voltage to > > ground. Measuring the Millen connectors to ground revealed a short. Here > > the Millen connectors on the modulator were arcing to ground on the > > secondary side of the modulation transformer running from the high voltage > > through the secondary winding to the PA amplifier. I am using those > light > > tan units that are supposed to be better than the red connectors. Stan > used > > these connectors on the PA amplifier, the modulator deck, and the high > > voltage power supply. > > > > I suppose that under modulation that the peaks exceeded the voltage rating > > of the Millen connectors. Once before many years ago, I had the same > > problem. However, these connectors are often used in homebrew > construction > > projects as described in the ARRL handbook. > > > > Any ideas out there other than to go with ceramic feedthrough insulators. > > > > Perhaps, it is because of their age and the insulation is breaking down. > > Who knows! > > > > Thanks > > > > Dave, W3ST > > Publisher of the Collins Journal > > Secretary to the Collins Radio Association > > www.collinsra.com - the CRA Website > > Now with PayPal > > CRA Nets: 3805 Khz every Monday at 8 PM EST > > and 14255 every Saturday at 12 Noon EST > > > > > > ______________________________________________________________ > > AMRadio mailing list > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:AMRadio@mailman.qth.net > > AMfone Website: http://www.amfone.net > > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb > > > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb >