Another batch of 122 GHz W2IMU f/d 0.8 feedhorns

Brass W2IMU dual-mode feedhorn for 122 GHz

I’ve just completed a batch of 24 of these W2IMU feedhorns for the 122 GHz band. Thread as usual is M8 x 0.5 mm. Horn ID is 4.03 mm, 27.1 degree internal flare, 2.00 mm reamed waveguide core, rear duplexer cavity for VK3CV boards, four M2 threaded holes, 4.00 mm reamed barrel, 3.98 mm spigot on the waveguide. This is the version 2 with a flat step as the end stop. Rather than relying on the 7.5 mm tapping drill to make the bottom of the threaded section, I now machine that using a centre-cutting M7 end mill. Part number for this version is DBN-122-IMU-0.7-02 and price to bona-fide 122 GHz experimenters is £14

The coupler body, internal thread M8 x 0.75, 14.85 mm diameter
Core of the horn, threaded M8 x 0.5, reamed to 2.00 mm internally
Rear cavity to fit over the chip on the VK3CV board. The barrel is adjusted for best TX and TX performance

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