I want a nice IF assembly which will accept 3 to 5 H/V/UHF modules at a time.

Make it dual conversion which will allow for the use of commonly available 455 or 500KHz filters in the 2nd IF. Incorporate an IF notch, 1st IF PBT/VBW control and variable AGC. Variable NB. Repeater offsets can be automagically determined by the module being inserted, and the less overall reliance on inter-module microprocessor control the better. All mode chassis...including AM. A squelch which works on all modes.

Modules which cover the following, and an open architecture for those wishing to roll their own:

HF (15-12-10)
6
2
222
430
440
902
1.2G (several ranges)

Computer control of all operating parameters. An embedded keyer, and a self-test function.