A few comments about 23 cm. I used to operate an analog 23 cm repeater. It was located at the same (urban) site as a 440 repeater. They got almost identical coverage. Obstructions are problem for 23 cm. A brick wall can literally be a brick wall for a 23 cm signal. But, as several people pointed out, that short wavelength will sneak it's way around obstructions. I once carried on a QSO, from an underground parking garage. I have no idea how the signal made it's way out of there, but, it did. I could hear nothing on 2M or 440, down there. For a base station or repeater, height is everything. You need to be above the surrounding obstructions. We use a Downeast Microwave preamp on our DV repeater. Steve tuned it to our frequency. It made a huge difference. As to DD, we are still learning. Evans, KD4EFM, Clyde WD4LWG and myself are going to start learning what we can do with an ID-1, over the next few months.
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