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In my future shack I will have glass block windows consisting of 6 x 8 blocks and a 6 x 16 vent. I've been searching, but cannot find the best solution to pass coax through the windows. I've thought about machining a plastic block to insert in the vent and insert bulkheads through the plastic block, and I've thought about replacing a glass block with a dryer vent, but that is unsatisfactory.

I'm looking for ideas to pass coax through a glass block window. Thanks in advance.

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    $\begingroup$ Why not go through something other than the window? You can drill a hole in glass, but drilling through any other construction common material is probably easier. $\endgroup$ – Phil Frost - W8II Apr 29 at 21:47
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    $\begingroup$ What's a glass block window? A thin sheet of glass like a regular window, or a glass brick 50-100 mm deep, laid like a regular masonry brick? Also please add: what frequencies you're planning to operate, and at what power level? $\endgroup$ – tomnexus Apr 29 at 21:53
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    $\begingroup$ @tomnexus certainly the latter. For example: lowes.com/pl/Glass-block-windows-Windows-Windows-doors/… $\endgroup$ – Phil Frost - W8II Apr 30 at 14:57
  • $\begingroup$ @PhilFrost-W8II I agree I wouldn't want to drill through glass. I'm thinking of something I could use to replace one of the glass blocks, most likely. $\endgroup$ – K8KV Apr 30 at 18:36
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    $\begingroup$ What frequencies are you planning to operate, and at what power level? I'm thinking of using a thin coax, perhaps 1 or 2 mm diameter, pushed through a hole on the mortar / grout between blocks... $\endgroup$ – tomnexus May 2 at 6:04
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You could use a short jumper of a thin cable, pushed through a hole drilled in the grout between the blocks, or next to them in the plaster.
141 semi-rigid coaxial cable
A 141-size cable is 3.6 mm in diameter, and the base model with teflon / copper claims to handle 600 W up to 500 MHz so that might be an option. You'd need some N-type connectors for the thin cable on both sides of the window, it's not flexible enough to go to your rig.

The power limit is a thermal limit, so must be derated for SWR > 1:1, but if it's 600 W PEP then it will be be OK with 1.5:1 SWR. If the SWR is very high and you have a tuner inside, then it might only cope with 100-200 W.

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  • $\begingroup$ This is a good idea. Thanks! $\endgroup$ – K8KV May 6 at 1:26

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