## already read it several times in the last year.... + JIs
comments on qrz + qth. Conducto lube is 75% pure silver and 25%
castor oil...... NO grease used. The silver plated edge wound roller
+ 1 inch square silver plated cu tube + end pieces, all use sliding
contacts..... everything is silver plated. Sliding contacts ride on
both sides of the .375 inch, edge wound roller. My old roller used a
pair of pulleys and a HUGE SPRING between em to put a lot of pressure on
the pulleys..which ride on the EDGE of the edge wound roller.
## conducto lube is used in industry for sliding contacts that are
silver plated. noalox, graphite, penatrox, etc, are not used on silver
plated anything. At the telco I worked at, we used... copper kote
on copper buss bars.... which were bolted. Copper powder in grease.
## Im up for a good experiment. I have 2 of these silver plated
rollers. so one with dielectric grease..and the other with conducto
lube. Apx 15A flowing through the roller..in the hb amp.
## Below is from jis site In the url.
Jim VE7RF
Contact arcs have the ability to alter composition of greases. Silicone
greases can be converted by arcs to silicone carbide, which is highly abrasive.
For this reason, SILICONE GREASE should be avoided when contacts are "hot
switched" and have ANY chance of arcing.
The suspended powder creates a problem that does not exist with dielectric
grease. The suspended metal must be FULLY COMPATIBLE with the metals being
clamped. This means conductive grease is application specific. If the metals
being clamped are incompatible with the grease's suspended metal powder, the
connection will eventually fail. This is what happened in our CATV system
connectors. The connections were a mix of copper, aluminum, and steel. The
cable shields were aluminum, the trunk center conductors cables were copper
clad aluminum. Drop cables were aluminum shields and connectors, with copper
clad steel centers. Our records showed a much higher incidence of corrosion
failure using conductive grease. Corrosion failure rate dropped significantly,
almost to zero, when we switched to pure dielectric grease.
In bolted or clamped connections, I have no opinion if conductive greases help
or are necessary. I feel like they help, but I'm not sure if that is true. I
use Noalox on clamped aluminum slip joints in antennas because it is generally
less expensive than silicone dielectric greases and it appears to last longer.
I NEVER use conductive greases on push fit electrical connectors, or if I am
unsure of metal to grease compatibility.
Conductive greases should specifically match materials being clamped.
Conductive greases should never be used in low pressure electrical connectors,
or in connectors with multiple terminals
From: Kim Elmore
Sent: Thursday, January 2, 2020 6:29 PM
To: Tom Hellem
Cc: MU 4CX250B ; Jim Thomson ; amps@contesting.com
Subject: Re: [Amps] Dielectric grease for roller inductors?
See https://www.w8ji.com/dielectric_grease_vs_conductive_grease.htm for the
full treatise. Bottom line is the“conductive” grease refers to its thermal, not
electrical, characteristics.
Kim N5OO
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