[Premium-Rx] AM Synchronous Detector Article on Our Webpage

[Carcia, Francis A HS]

Hi all,
That was an interesting schematic. That mixer looks similar to the
front end of the sdr1000. The limiter could be replaced with the chip used
in the Racal demodulator. I think I would use a VCXO with a XOR gate as a
phase detector so the output of the phase detector would be 50% or center
tune when there is no signal present during deep fades. I might want the
loop filter to have an automatic time constant change based on the time the
phase lock was valid and a drop out also based on the phase unlocked time.
fc

-----Original Message-----
From: Ahmet Gundes [mailto:ahmet-m at usa.com]
Sent: Tuesday, March 22, 2005 11:51 PM
To: jan at skirrow.org; premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] AM Synchronous Detector Article on Our Webpage


Hi Jan,

Correct me if I am wrong but it appears the S041P is used
only as a "Limiter" in this circuit.  This can easily be 
replaced by some alternatives. Couple of them come to my
mind such as:

TA7061BP Limiter which is used in the ECSS module of NRD535
this part is obsolete but can be found in the market for about
$ 2.00

A popular part, Philips SA604AD, has a good limiter. It can also 
be used but has a lot more in it than just a limiter. And it is available in
the market only in SMD package ( about $ 7.00 ).

Regards
Ahmet



> 
> Hi gang ...
> 
> The article Michael O'Beirne sent me about an AM Synchronous 
> Detector is now up on the Premium-Rx website.
> 
> I had two versions of the article. The first was published in 
> Electronics & Wireless World in September 1989. But it was 
> difficult to scan properly. So I've chosen to use the author's 
> original manuscript instead. I do not have the author's name, but 
> will add it on the website when I get it.
> 
> The detector described was developed with the intention, I gather, 
> of it being marketed. But some kind of patent dispute prevented 
> that. Michael has a prototype of the device and likes it. I was 
> unsure about the worth of posting the article if the key component 
> - the Siemens S041P was not available. But the replies I got to my 
> query on this suggests it is, at least for the moment.
> 
> It's on our website Reference page under Articles. For those who 
> want to go straight to the beef:
> 
> http://kahuna.sdsu.edu/~mechtron/PremRxPage/ref/amsynchronous.pdf
> 
> The document is a 380k PDF file.
> 
> Jan
> 
> 
> 
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