The extra dielectric is going to increase the stray capacitance and the
PVC has loss. So expect a lower self resonant frequency and more loss.
I'm trying to make some high Q coils and conclude PVC pipe is a poor
form, even machined into a skeleton support. That's CW but I thought a
skeleton might be ok - NOT. I think grey PVC is grey in part to a clay
filler to make it UV resistant.
Then a challenge is the grease should have very low moisture absorption
or the (I suspect) reason for it is negated or worse.
On my RG400/316/179 etc pigtail ends I apply a little red insulating
varnish which wicks into the braid amazingly far. The plan is to
prevent water from wicking. A downside of TFE coax is almost nothing
will stick to it. I also apply the varnish around all bulkhead
connector flanges and screws.
Grant KZ1W
On 9/22/2019 11:46 AM, Robert Harmon wrote:
I am making a current balun with a 2.4" OD Fair Rite core wound with RG-400.
PVC pipe is going thru the center and the RG-400
is routed thru the inside to SO-239's in PVC pipe caps on the ends. I am
planning on flooding the choke with dielectric grease
before completing the assembly and I'm trying to decide what dielectric grease
to use. What would you use ? Super Lube is supposed
to be a dielectric greae, would it be suitable ?
Bob
K6UJ
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