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[CQ-Contest] RE: [TowerTalk] coax cables

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Subject: [CQ-Contest] RE: [TowerTalk] coax cables
From: (Dubovsky, George)
Date: Wed Feb 5 08:37:06 2003
First, I don't like to use UHF connectors at all; N connectors are easier to
install and more trouble-free over the long haul. But in the few cases where
PL-259s are unavoidable, I *do* use a soldering gun, but without the tip. I
made up two little copper spuds that stick out of both tips of the gun, but
don't touch each other. When I jam the gun against the connector barrel, the
barrel completes the circuit, making a simple and very repeatable resistance
soldering rig.

I can't claim credit for this idea; it has probably appeared in Hints and
Kinks several times over the last 40 years.

geo, n4ua

> -----Original Message-----
> From: Steve Katz []
> Sent: Tuesday, February 04, 2003 5:59 PM
> To: 'Paul Womble'; ''
> Subject: RE: [CQ-Contest] RE: [TowerTalk] coax cables
> Hi Paul,
> It doesn't have much to do with "wattage."  It has to do with 
> thermal mass.
> A large soldering IRON, the type with a 1/2" wide or larger 
> chisel tip made
> of copperclad iron and attached to a huge heating element 
> barrel that weighs
> a couple of pounds, has a large thermal mass.  So large that when it
> transfers its heat to the barrel of a PL-259, the soldering iron tip
> temperature doesn't even change, because its thermal mass is 
> huge compared
> with the small thermal mass of the connector.
> A soldering GUN, on the other hand, regardless of its 
> "wattage" rating, has
> a tiny soldering tip, about an ounce of pure copper, and 
> that's all it's
> got.  Copper is very thermally conductive, so it heats very 
> rapidly.  Which
> means it also cools off very rapidly.  Which means that when 
> its tip is
> applied to the connector body, the connector, having much 
> larger thermal
> mass than the soldering gun's tip, sucks all the heat out of 
> the tip and the
> tip temperature immediately drops below soldering 
> temperature, so you have
> to keep the trigger pulled while it heats up again.
> All this time, you're pouring heat into the connector body as 
> it slowly gets
> hotter, and hotter, and hotter, for quite a while.  While 
> that's occurring,
> the cable dielectric is melting.
> Ugh.
> A good IRON, on the other hand, transfers enormous heat very 
> quickly without
> cooling down and thus the connector body can be soldered 
> within a couple of
> seconds.  And then the iron can be removed so the connector can begin
> cooling off before the cable dielectric melts.
> And that's about it.
> WB2WIK/6
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