A few weeks ago, I picked up a different $7 4:1 DiSEqC switch, and today I modified it to work with the Frankenswitch v3 USB-based controller built previously.

The new switch has all of the coax jacks on the same edge of the casing, making it much friendlier to use.

Internally, each signal path has its very own dedicated pair of two pin diodes (eight in total), compared with the v3 DiSEqC switch's total of six diodes for the four inputs.

The PCB layout is also better than the earlier one, and this time I used SMT 470pF capacitors for the DC blocking caps (I already had some on hand) instead of the long leaded 1000pF caps used earlier.

The results are good -- +0.2dB improvement on the SNR reported by my best tuner, and visibly better on-screen analog TV, especially VHF-6.

I expect 1000pF would do every bit as well (or better), but I don't have any SMT ones on hand to try.

Cheers