[AMRadio] Millen High Voltage Connectors


Rev. Don Sanders innatehealing at bigplanet.com
Mon Jan 9 20:28:09 EST 2006


That's what cable markers are for!

Healthfully yours,
                          DON W4BWS
----- Original Message ----- 
From: "Brett gazdzinski" <>
To: "'Discussion of AM Radio'" <amradio at 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: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Ed Swynar
> Sent: Monday, January 09, 2006 4:01 PM
> To: Discussion of AM Radio; boatanchors at mailman.qth.net
> 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" <collinsradio at adelphia.net>
> To: <amradio at mailman.qth.net>; <boatanchors at mailman.qth.net>
> 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
> >
> >
> > ______________________________________________________________
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>
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