This page is going to document my homebrew transceiver. At present it is only a pipe dream on paper!
This is what I would like (eventually)

1. Unrestricted transmit from LF (135-137.1kHz) through to SHF (5.8GHz ham band).
2. Unrestricted receive from DC to 5.8GHz
3. All known modulation techniques and demodulation techniques on any band to be possible (although not necessarily practical; eg FM voice on 136khz is impractical as it would use the entire bandwidth of the band if compressed to fit into a 1.05kHz kHz block and used on precisely 136kHz).
4. "True" quad VFO - be able to watch 3 bands and talk on a 4th simultaneously.
5. RF relays to switch any antenna to any transceiver.
6. 8 antenna outputs
7. 4 independent ATUs using PIC controlled RF relays to swtich varying LC tuned circuits (similar to ICOM-AH4).
8. VGA LCD screen (with option to output TV onto LCD, or RCA terminals).
9. QNX operating system
10. USB slave for flashing firmware, also serial 4 bridges for use with computers for digital modes.
11. USB host for keyboard
12. Built in RTTY, PSK31, PACTOR, AMTOR, other digital modes (so no computer required)
13. SDcard reader for serialising data (eg antenna tuning, recording conversations)
14. Record conversations as AAC.
15. Spectrum waterfall analysis.

Many features can be implemented in software if the correct hardware is used. I hope to use a "motherboard" + "daughterboard" design, and mix signals to a common IF that can then be mixed using a quadrature mixer (similar to most software defined radios). Packaging will hopefully be in a 4U rackmount chassis
DDS chips such as the AD9850 or SI570 will make short work of smaller