[ARC5] RU Receiver Hook-Up: Preliminary

[Mike Morrow]

Dave, your circuit looks good to me for the nt-46051* commamd set receiver (designed for use with a GF-* transmitter).  Of optional note is that pin 79 is actually an *input* to the receiver from the GF-* modulator output, which is also the sidetone source and ICS amp.

Things are a little different for the nt-46048* liaison receiver version, which has no need for the sidetone or ICS features and which has the two AGC resistors built in to the receiver.  Thus, the following alterations at pins:
77 - No connection (no external 105 or 1000 ohm resistor used).
79 - HV to Detector/CW Oscillator/AF stage.  Jumper to pin 80.
89 - Pin does not exist.

Mike / KK5F

-----Original Message-----
>From: David Stinson <arc5 at ix.netcom.com>
>Sent: Jun 17, 2012 5:20 PM
>To: milsurplus at mailman.qth.net, ARC-5 List <arc5 at mailman.qth.net>
>Subject: [ARC5] RU Receiver Hook-Up: Preliminary
>
>Someone (Hue, I think) asked about powering-up
>the RU receivers.  Just did a preliminary circuit trace.
>I haven't tried this yet.  
>Will report on how it works when I get to it. 
> Notes: 
>B+ supply must have "floating" B-.
>Jumper pin 89 to pin 76 - turns on audio PA.
>Pin 78 goes to B-, NOT ground.
>The AVC bias dividers can be smaller Wattage
>if you use less B+.
>25K for the gain pot will work fine.
>I recommend lower than the speced 250 volts B+.
>I'd bet coffee and donuts it will work fine at 100 or so.
>Audio out at 79 does not use the low-pass audio filter.
>If you want that, take audio from pin 75.
>Diagram:
>
>http://home.netcom.com/~arc5/RUpwrtrc.jpg
>
>Anyone tries this and finds a problem, please post.  
>Thanks.
>
>73 Dave AB5S
>
>
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