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

[jan at skirrow.org]

Hi Ahmet ...

You may well be right. The problem is that the SO41P is described as a "low 
noise" version of this kind of chip, with low AM to PM conversion at low 
signal levels. Without a spec sheet on this IC (which I still haven't 
found) I have no way to compare it to the more modern alternates. So these 
may well work fine, but I have no way of knowing. If this wasn't defined by 
the designer as a "critical part" I wouldn't be concerned. However, for 
those who want to build one it would seem the Siemens chip is available. If 
anyone does build one, and is able to adapt it to a newer chip, it would be 
interesting to compare performance.

73s, Jan



At 08:50 PM 3/22/05, you wrote:
>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this part is obsolete but can be found in the market for about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
> >
> >
> >
> > _______________________________________________
> >
> > Premium-Rx Mailing List
> > To Post: premium-rx at ml.skirrow.org
> > For Info: http://ml.islandnet.com/mailman/listinfo/premium-rx
> > Visit the Website: http://kahuna.sdsu.edu/~mechtron/PremRxPage/
>
>--
>___________________________________________________________
>Sign-up for Ads Free at Mail.com
>http://promo.mail.com/adsfreejump.htm



============================================
On Canada's Beautiful Wet Coast ....

For Info and SSB Detector Kits for the R390 & R390A
Visit: http://skirrow.org/Boatanchors/

For Info on Premium Modern Radios
Visit: http://kahuna.sdsu.edu/~mechtron/PremRxPage/
============================================
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/premium-rx/attachments/20050323/d76211c1/attachment.htm