Therein lies a problem; I had considered the use of 270MHz
SAW filters as used in GSM phones as RX roofing filters, but
with the deign of GSM phones moving en masse to direct
conversion, that's not possible.

One area in which we can assure some degree of future proofing
is to define the interfaces between the sections so that any
section could be replaced by circuitry of your own making
and/or of your own repair.

"Paul Burridge" wrote in message
...
On Sun, 9 Jan 2005 15:04:59 -0000, "Airy R. Bean"
wrote:

.....is that we club together and conceive of a design
for an HF transceiver that could form the basis of the
station of any budding Radio Ham.

Excellent idea. Let's make it a high-quality job, though;
uncompromising on sensitivity/selectivity/noise etc. And use
ubiquitous, easily-available components that will be around for the
foreseeable future to come to permit serviceability over the long
term!
--

"What is now proved was once only imagin'd." - William Blake, 1793.