[TowerTalk] DC-4 or DC-5 ?
kc4pe at bellsouth.net
Mon Jul 10 07:54:08 EDT 2017
Don't know..been fighting this battle for 50 years.
If you use a coax that had a a braid then there is no way to really
The jacket breaths..
moisture ligates thru the jacket and through the braid.
Litigates through the dielectric
Now moisture on the center conductor, and corrosion.
Now I have tried them all...glued shrink tubing...submerse the whole
joint connector in wax/paraffin...
The best I have found is:
Prepare a plastic box large enough to hold the connector in and out..run
12vdc to the box, and install a 12VDC heater, with thermostat and with
moisture sensor and it all comes with a 1.5 inch fan... Seal the coax
in and out with epoxy, and use Hard Line....an ll this can be found at a
CCTV security shop, this is used in camera housing to do exactly what we
want to do with coax and moisture.
Coast the connector with a dielectric grease and stop, leave it out in
the elements, it will dry as fast as it retains water..when you tape or
whatever to cover the connector your are inhibiting it's ability to
dry...open yearly and re-grease. and use hard-line. The procedure is
plan and simple but works, have two twos up for 25 years with this type
On 7/10/2017 2:34 AM, Roger (K8RI) on TT wrote:
> I've been using these dielectric greases for over 30 years.
> For your use, it doesn't make a difference. Both are essentially
> dielectric greases, not lubricants although they will serve that
> purpose. You can even flood the connectors, but be warned that
> "flooding" has its own problems. Be careful with Silicones. Nothing
> will stick to them. HOWEVER , in the presence of a high voltage arc,
> both will break down with one of the byproducts being SiO2 (Silicone
> Dioxide = powdered quartz) a highly abrasive material.
> I used to get a lot of both for a buck a 10 oz tube at the company
> store. A 10 oz tube lasts a very long time.
> 73, Roger (K8RI)
> On 7/9/2017 Sunday 11:59 AM, Jim Thomson wrote:
>> Which of the Dow corning products would be best for coax connector
>> center pins,
>> and also on the threads of coax connectors ?
>> Scroll down a bit to get the pdf file.
>> Pdf file is down a bit.
>> DC-4 might be better for threads...and DC-5 might be better for the
>> center pin, dunno, it’s a little confusing.
>> DC-4 is good for spark plugs, which is hv. Then DC-5 is made for
>> HV. yet the DC-4 has a higher standoff V, 1 kv per mil.
>> DC-5 is 545 V per mil.
>> I also need something to coat the rubber gasket seals on several
>> nema-4 boxes which will be outdoors.
>> I might get one of each type, as I can see where this goop would work
>> on a lot of items used both indoors and outdoors.
>> Has anybody used either of these products...and what application did
>> you use it ?
>> Jim VE7RF
>> TowerTalk mailing list
>> TowerTalk at contesting.com
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