MW Receiver
 

The MW receiver is progressing pretty well.................I have completed
the synthesizer, and am now doing the final pass on the receiver board
itself. MDS measures at .2uV right now, with strong signal handling up to
about 900mV.
Next week, I plan to design the sync detector, but there are a couple of
things to keep in mind. If there are two closely spaced signals, the
stronger signal will capture the system. For this reason, I may also include
the envelope detector function.
The initial results are very encouraging....................in the "RF
Alley" that I live in, with three 50kW MW broadcasters, no overload problems
were noted. I will keep all of you posted on the progress of the design.

Pete

"Pete KE9OA" wrote in message
...
The MW receiver is progressing pretty well.................I have
completed
the synthesizer, and am now doing the final pass on the receiver board
itself. MDS measures at .2uV right now, with strong signal handling up to
about 900mV.
Next week, I plan to design the sync detector, but there are a couple of
things to keep in mind. If there are two closely spaced signals, the
stronger signal will capture the system. For this reason, I may also
include
the envelope detector function.
The initial results are very encouraging....................in the "RF
Alley" that I live in, with three 50kW MW broadcasters, no overload
problems
were noted. I will keep all of you posted on the progress of the design.


Any ballpark idea of what this little jewel will end up costing??

Hi Brenda,
I am not sure yet..............it depends upon what features
folks are looking for. If we put in the spectrum analyzer type of display,
and the sync detector, it will probably be in the just under 300 dollar
range. For this price, the performance will be in the class of the
multi-thousand dollar offerings from Harris, Racal, Rockwell-Collins, etc.
The unit will have a tracking preselector for the active loopstick antenna,
which will tilt in both planes. I am not sure if I will go for multiple
bandwidths, or use a couple of narrow bandwidth filters, and use a phasing
technique to achieve continous bandwidth control.
Still a few more ideas to implement.

Pete

Brenda Ann wrote in message
...

"Pete KE9OA" wrote in message
...
The MW receiver is progressing pretty well.................I have
completed
the synthesizer, and am now doing the final pass on the receiver board
itself. MDS measures at .2uV right now, with strong signal handling up
to
about 900mV.
Next week, I plan to design the sync detector, but there are a couple of
things to keep in mind. If there are two closely spaced signals, the
stronger signal will capture the system. For this reason, I may also
include
the envelope detector function.
The initial results are very encouraging....................in the "RF
Alley" that I live in, with three 50kW MW broadcasters, no overload
problems
were noted. I will keep all of you posted on the progress of the
design.


Any ballpark idea of what this little jewel will end up costing??

Joseph Worcester, who developed and sold the SPACE MAGNET ferrite active
antenna, also built a high-performance MW receiver and got a patent on the
circuit which changed the bandwidth as the signal strength changed. I remember
reading the patent and thinking he'd invented AM stereo. Jis radio sold for
$700 in the 70s.
Matt

Behold, Pete KE9OA signalled from keyed 4-1000A filament:

........in the "RF Alley" that I live in, with
three 50kW MW broadcasters, no overload problems were noted. I will
keep all of you posted on the progress of the design.

All thanks to that diode-ring mixer ;-)

Thanks for keeping us posted Pete!

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Thanks for keeping us in the loop on this, Pete, I'm *really* looking
forward to this one hitting the market.

Eric

--
Eric F. Richards,
"Nature abhors a vacuum tube." -- J. R. Pierce, Bell Labs, c. 1940

EFR, Ditto That !

Pete, nice to have your status report, and
to hear the progress that you are making.

kutgw ~ RHF
..
..
= = = Eric F. Richards
= = = wrote in message . ..
Thanks for keeping us in the loop on this, Pete, I'm *really* looking
forward to this one hitting the market.

Eric

Is there any other information available about this receiver?
Is it meant to produced commercially?

"Pete KE9OA" wrote in message
...
The MW receiver is progressing pretty well.................I have
completed
the synthesizer, and am now doing the final pass on the receiver board
itself. MDS measures at .2uV right now, with strong signal handling up to
about 900mV.
Next week, I plan to design the sync detector, but there are a couple of
things to keep in mind. If there are two closely spaced signals, the
stronger signal will capture the system. For this reason, I may also
include
the envelope detector function.
The initial results are very encouraging....................in the "RF
Alley" that I live in, with three 50kW MW broadcasters, no overload
problems
were noted. I will keep all of you posted on the progress of the design.

Pete

...got a patent on the circuit which changed the bandwidth as the signal
strength changed.

Automatic regeneration control? I guess that would be shortened to ARC.

On a HW-101 I once had, I added manual regeneration control. Actually, I
modified the stage that had the RF gain control by adding a tickler feedback,
to do just that. To pick out a weaker signal, I would increase the RF gain,
effectively increasing the regeneration which would decrease the band width in
the process.

Bill, K5BY

Is it going to be in kit form? :o)