[R-390] Sync Det II

[Gordon Hayward]

The NE602 is nice but as you say, unobtanium.  If I ever come across
some at a hamfest, I'll buy them all.  I use the Motorola MC1496P
which, although just as old is still available.  For the design,
I just follow the app notes on the spec sheet.  I've used it in a
VLF converter for the 390 and in the dual product detector
attached to the IF out.  I haven't used anything like the NE604
yet.

For drawing schematics I use express sch which is a free download
from express pcb.  It will create bit images from the schematics.

Cheers, Gord VE3EOS

----- Original Message -----
From: "Perry Sandeen" <sandeenpa at yahoo.com>
To: r-390 at mailman.qth.net
Sent: Tuesday, October 29, 2013 10:05:39 PM
Subject: [R-390] Sync Det II
 
List, 
 
The ski that Al sent me from the QST is the one I
was thinking about and I started re-drawing it with photoshop elements as a bit
image.
 
Several hours down the road working on the
schematic I decided to see what IC’s were used.
 
Then I discovered a major problem.  They all seem to be “unobtainium”.
The one source listed is out of business.  My search on Ebay didn’t show anything except
two surface mount NE602 pieces.  I didn’t
follow up on the IF subsystem that was used for availability. 
 
Unless someone has sources for these IC’s this
becomes a dead end project unless some on the list is able to redesign it with
available components.  Redesigning it is
far beyond my skills.
 
The project needs two NE602 and one NE604 FM IF
subsystem IC’s.  If anyone wants to
search them out and they are available at a somewhat reasonable price the list
would appreciate the info.
 
Regards,
 
Perrier
 
P.S. If anyone is interested I have a 20 gallon SS
single column still for sale.  Shipping
weight exceeds 100 pounds in two boxes.  Requires
two 220 volt water heater heating elements and control circuit, not included.
 
Remember it’s not too early to get ready for the
upcoming holiday festivities! Contact me off line please.
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