|[AMRadio] Millen High Voltage Connectors|
w5jo at brightok.net
Mon Jan 9 16:12:26 EST 2006
Dave there are other makers of HV connectors out there. On their high power
base stations, Motorola use a Teflon one. They are similar to one sold by
Surplus Sales of Neb., see here:
The site says a pair are 14 for the Teflon type and the old style Millen
tan colored are almost 20. The black are 15.60
Good luck & 73
----- 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 2:50 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!
> Dave, W3ST
> Publisher of the Collins Journal
> Secretary to the Collins Radio Association
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