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SSB AM FM Detector IC



 
 
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  #1  
Old May 24th 04, 06:07 AM
The Eternal Squire
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May I have a couple to experiment with, too?

Thanks,

Andrew Jonathan Fine
WA2JAZ
(aka The Eternal Squire)

Harold E. Johnson wrote:
Does anyone know of a multimode detector IC that will handle SSB, AM and


FM?

Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?


I have some 373's and I think, some 273's as well if you'd like to try your
hand at one. (free to good home)

W4ZCB



  #2  
Old May 24th 04, 06:07 AM
The Eternal Squire
Guest
 
Posts: n/a
Default

May I have a couple to experiment with, too?

Thanks,

Andrew Jonathan Fine
WA2JAZ
(aka The Eternal Squire)

Harold E. Johnson wrote:
Does anyone know of a multimode detector IC that will handle SSB, AM and


FM?

Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?


I have some 373's and I think, some 273's as well if you'd like to try your
hand at one. (free to good home)

W4ZCB



  #3  
Old May 24th 04, 06:09 AM
The Eternal Squire
Guest
 
Posts: n/a
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Ah, but DSP is far from simple to work with... and is overkill for
popcorn gear.

Leon Heller wrote:

"John" wrote in message
...

Does anyone know of a multimode detector IC that will handle SSB, AM and


FM?

Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?



You can do all those modes with a DSP. 8-)

Leon


  #4  
Old May 24th 04, 06:09 AM
The Eternal Squire
Guest
 
Posts: n/a
Default

Ah, but DSP is far from simple to work with... and is overkill for
popcorn gear.

Leon Heller wrote:

"John" wrote in message
...

Does anyone know of a multimode detector IC that will handle SSB, AM and


FM?

Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?



You can do all those modes with a DSP. 8-)

Leon


  #5  
Old May 25th 04, 07:06 AM
John
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Posts: n/a
Default SSB AM FM Detector IC

Does anyone know of a multimode detector IC that will handle SSB, AM and FM?
Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?

Thanks



  #6  
Old May 25th 04, 03:46 PM
Michael Black
Guest
 
Posts: n/a
Default

"John" ) writes:
Does anyone know of a multimode detector IC that will handle SSB, AM and FM?
Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?

Thanks



The LM373 was a whole IF strip, a variable gain stage and then a fixed gain
stage feeding the detector. The detector itself is relatively simple.

A "Gilbert Cell" mixer can be a multi-mode detector. Obviously, it's
a product detector for SSB and CW. But put the incoming signal through
a limiter and use that as the "BFO" input and you've got an AM detector
(while the 373 has a separate AM detector, the application notes even
suggest this scheme). Limit the incoming signal, and then feed it
through a suitable phase shifter into the "BFO" input, and you've got an
FM detector.

"Gilbert Cell" mixers show up in plenty of places. The MC1330 AM detector,
and all kinds of FM detector ICs (where they are used as quadrature
detectors, as I describe above)

But I suspect at this late a date, an IC designed to be a multi-mode
detector or IF is realtively rare. There is not much demand for it.
So you have to create the function yourself.

Michael VE2BVW

  #7  
Old May 25th 04, 03:46 PM
Michael Black
Guest
 
Posts: n/a
Default

"John" ) writes:
Does anyone know of a multimode detector IC that will handle SSB, AM and FM?
Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?

Thanks



The LM373 was a whole IF strip, a variable gain stage and then a fixed gain
stage feeding the detector. The detector itself is relatively simple.

A "Gilbert Cell" mixer can be a multi-mode detector. Obviously, it's
a product detector for SSB and CW. But put the incoming signal through
a limiter and use that as the "BFO" input and you've got an AM detector
(while the 373 has a separate AM detector, the application notes even
suggest this scheme). Limit the incoming signal, and then feed it
through a suitable phase shifter into the "BFO" input, and you've got an
FM detector.

"Gilbert Cell" mixers show up in plenty of places. The MC1330 AM detector,
and all kinds of FM detector ICs (where they are used as quadrature
detectors, as I describe above)

But I suspect at this late a date, an IC designed to be a multi-mode
detector or IF is realtively rare. There is not much demand for it.
So you have to create the function yourself.

Michael VE2BVW

  #8  
Old May 25th 04, 04:47 PM
Harold E. Johnson
Guest
 
Posts: n/a
Default


Does anyone know of a multimode detector IC that will handle SSB, AM and

FM?
Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?

I have some 373's and I think, some 273's as well if you'd like to try your
hand at one. (free to good home)

W4ZCB


  #9  
Old May 25th 04, 04:47 PM
Harold E. Johnson
Guest
 
Posts: n/a
Default


Does anyone know of a multimode detector IC that will handle SSB, AM and

FM?
Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?

I have some 373's and I think, some 273's as well if you'd like to try your
hand at one. (free to good home)

W4ZCB


  #10  
Old May 25th 04, 05:23 PM
Leon Heller
Guest
 
Posts: n/a
Default

"John" wrote in message
...
Does anyone know of a multimode detector IC that will handle SSB, AM and

FM?
Looking at an old ARRL handbook I can see LM373. Is there a more modern
chip?


You can do all those modes with a DSP. 8-)

Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller


 




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