- WR90-SMA transition update
Re: WR90-SMA transition update
Alex May M1BSX
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A thing of beauty! :-)
Very intrigued as to how it was milled and whether you're using an empirical approach to determine the length of the "probe" ?
73s Alex (M1BSX)
On Thu, 10 Sep 2020, 00:01 Neil Smith G4DBN, <neil@...
This pic is my first try at machining an SMA coax to WR90
waveguide transition. Milled it from a lump of 1 3/4 inch
aluminium square bar on my ancient Bridgeport. It needs a bit
of trimming to get it bang on frequency as I left the pin a little
long. Now I'm waiting for a load of Radiall SMAs to arrive from
I modelled it in OpenEMS with a three-inch length of WR90 mated
with the oval cavity. Return loss (black) and through loss (red)
look promising, I need to check the real thing once I have the
probe filed to resonance.
Fusion 360 CAD image
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