RHF wrote in message
om...
PETE,

It is good to hear that this 'project' is still in the works.
- - - My comments [RHF] have been inserted into your message.

kutgw ~ RHF
.
.
= = = "Pete KE9OA"
= = = wrote in message
...
Hi folks,
Things have been going a million miles an hour! Right
now, I
am working on a low noise VCO design, with a tracking filter at the
output.
I have also been looking at a dual conversion chipset that Phillips came
out
with for the auto radio industry. These devices are used in the
Cambridge
Audio Model T500 FM/AM Tuner. Performance is pretty amazing on the MW
band,


[RHF] Regeneration in a 'stand-a-lone' Shielded Ferrite Rod AM/MW
Antenna would be a nice/useful feature. This would naturally be
'tunable' across the AM/MW Band and function as a 'tuned' RF Front end
for the Radio - Would It Not?

This will definetely be a tunable device; it is the only way to go.

[RHF] The Spectrum Display is a 'nice idea' for an Option of
Accessory:
- But what does that do to the price and basic afordability?
- - A built-in AM Sync Detector and PBT are a more important features
to me.

If I go with the single conversion route, I wouldn't be able to have the
PBT, but Sync AM is definitely in the works. I will definitely be working on
a steep skirted filter that has a flat passband.

[RHF] The "MODS" on the R-75 eGroup for the R75's AM/MW Sync-Detector
make it a good performer.
http://groups.yahoo.com/group/icomr75/files/

[RHF] Also the basic AM/MW Sync-Detector in the Grundig Satellit 800M
is a good performer.

I have played with that receiver, and it does sound good. I want to come up
with a design that tracks the signal all the way down into the noise. I
think that a big part of it will be having a long enough time constant on
the loop filter, so that if a signal fades out, there is enough hysteresis
to "hang on". The tradoff is acquistion time of the system, but I think that
I will be able to find a happy medium.
About the R75................I never did do the Sync mod to mine. I never
use that function. About the only thing I do is remove those MW attenuators.
Anyway, it looks like the majority of my e-mails have asked about Sync
detection, so this is the path I will follow on this design. Thanks for all
of your input!

Pete