Re: Tests of variable capacitors using Q meter including latest "0219" version Oren Elliott cap
Tom Crosbie G6PZZ <tom@...>
An extremely enlightening discussion. It reminds me of customers trading in gear who handed over a box with nicotine stained fingers and you just dreaded taking the kit out. White lettering turned yellow by heavy smoking and fans in the back dragging the same in through every vent slot. We cleaned it all off as best we could, but it was a lot of man-hours making it ready for sale…
As a DXer keenly awaiting delivery of a baby FSL, it has certainly given me food for thought when I visit costal locations. I recall Paul Blundell’s efforts in operating his inside a plastic tote box. From photographs taken at Rockworks etc., I see the FSL’s are covered in what I presume to be some kind of waterproof fabric. It seems this is not as waterproof as one might think. I would have thought that’s a bit high up for direct saltwater spray but with cars and truck roaring past creating wind that blows exhaust fumes, road debris, rain and who knows what in all directions. Down on the beach it’s a similar story. More at risk of sea spray, even a gentle breeze can blow sand, pollen from grasses and other vegetation.
Perhaps this calls for a holistic approach to mitigate the problem.
Gary, would it be possible to mount the 384P inside a small watertight plastic box? A clear box to see the vanes. I’m thinking a small hole drilled to take the Litz wire could be sealed with hotmelt glue. The shaft could be fed through a tightly fitting grommet in another hole. This might mean the supporting PVC pipe needs to be an inch or so longer, but I suspect Gary has shares in his supplier 😊
Just an idea from someone with zero field experience of FSL’s – yet!
73 Tom G6PZZ
Nr Chesterfield | NE Derbyshire | UK | IO93he
HF250 | Sentinel 4 | RSPdx | RM50 | TR2 | ATS 808
15m MLB | MTA | D707
From: main@UltralightDX.groups.io <main@UltralightDX.groups.io> On Behalf Of Gary DeBock via groups.io
Sent: 10 July 2020 10:56
Subject: Re: [UltralightDX] Tests of variable capacitors using Q meter including latest "0219" version Oren Elliott cap
Thanks Steve (and Dave),