I am not sure how far that is, or what frequency this station is on, but
typically, stations from 200 miles are possible. If propagation permits, you
will be able to hear any signal that is out there. I am working on the new
synthesizer for the radio right now, and I may be able to figure out how to
use the on-board oscillator of the TDA1572 with a crystal resonator. These
new changes will reduce the parts count of the radio by around 30 parts. It
may sound silly, but the fewer components there are, the fewer components
will fail. I remember the first time I looked into a 75A-4 receiver and
thought to myself "where are all the parts?"
Right now, I am looking into aluminum extrusions for the chassis, similar to
what Lowe and AOR use in their receivers. It's got to look as cool as it
works. If I can easily come up with a way to switch filters, I would also
like to have a wide and narrow I.F. bandwidth. Hittite makes some good RF
switches that might do the trick. The other way would be to use PIN diodes
with bias chokes, decoupling caps, and bias resistors. The Hittite devices
have better isolation and don't require these external support components.
Mini-Circuits was nice enough to send me a couple of samples of their POS-25
VCOs. These are really nice........they have internal tracking filters, and
I believe that the phase noise is around the -112dBc mark.............a PLL
circuit will clean this up further. If I can achieve a final phase noise of
around -120dBc, I will be happy.

Pete

wrote in message
...
Build me a Redifusion (Radio) that will from right here,West side of
Jackson,Mississippi U.S.A. that will pick up Monticello,Mississippi
U.S.A.in the daytime real good and good good without any fadeing in or
out,without any external hookup antenna and you have got a Winner.Build
that,I will pick up my phone and hand you my debit card number.I don't
use credit cards. www.forthepeople.org/radiostations.htm
cuhulin