Must have synch detection and selectable sideband. No serious MW
program listening is possible without it - the adjacent channel
shares spectrum with one sideband of the channel you're tuned to.

SSB upper and lower, and enough stability to hold the right
frequency for hours.

DSB reception (3dB better than SSB) with suppressed carrier notch,
to kill off slow carrier beats against multiple stations. The R8B
in SSB mode does this but gets only half the S/N that DSB would give.

(SSB and DSB for when there's more than one carrier present - the
pumping of the net carrier anti-pumps the detected audio, making it
unlistenable. Notching out the carrier(s) and just supplying
an internal stable one solves the pumping problem. The sidebands
do not pump by themselves, just the former reference carrier.)

Serious brick wall passband, to kill off an adjacent channel local
modulating the AGC on you.

Huge dynamic range; MW locals require it if you're going to suppress
them.

Audio notch filters against various hets from computer terminals
that the neighbors have.
--
Ron Hardin


On the internet, nobody knows you're a jerk.

Hi Ron,
This is supposed to be a budget unit..............I can design
all of those things into the unit, but it probably wouldn't be too cheap!
Ron Hardin wrote in message
...
Must have synch detection and selectable sideband. No serious MW
program listening is possible without it - the adjacent channel
shares spectrum with one sideband of the channel you're tuned to.

SSB upper and lower, and enough stability to hold the right
frequency for hours.
I believe that we are talking about a 50 dollar TCXO here.

DSB reception (3dB better than SSB) with suppressed carrier notch,
to kill off slow carrier beats against multiple stations. The R8B
in SSB mode does this but gets only half the S/N that DSB would give.

(SSB and DSB for when there's more than one carrier present - the
pumping of the net carrier anti-pumps the detected audio, making it
unlistenable. Notching out the carrier(s) and just supplying
an internal stable one solves the pumping problem. The sidebands
do not pump by themselves, just the former reference carrier.)

Serious brick wall passband, to kill off an adjacent channel local
modulating the AGC on you.

We've already got that.

Huge dynamic range; MW locals require it if you're going to suppress
them.

I am shooting for 5 volts of RF, before overload sets in. This way, very
long wires can be used. My present design already has better dynamic range
than my Drake R7.

Audio notch filters against various hets from computer terminals
that the neighbors have.
--
Ron Hardin


Thanks for the input, Ron!

Pete

On the internet, nobody knows you're a jerk.

Ron Hardin wrote:

Must have synch detection and selectable sideband. No serious MW
program listening is possible without it - the adjacent channel
shares spectrum with one sideband of the channel you're tuned to.

I agree. Sync' detection is the one feature missing from all current AM
(MW) receivers for the masses. I would prefer it to be a portable. I
guess the sync' feature would mean a price of at least $100. I wonder if
the Sony sync' (AM-stereo) chip would be available for your project, now
that the '2010' is out of production? Otherwise you would have to use
general purpose IC's for the sync' circuit. That's what Drake did. Good
luck with it.


-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----