[R-1051] Back Panel Plug Diagram

[Nick England]

If you have a chance to experiment with the regular 600 ohm outputs, please let us know the results. As Ray pointed put the R-1051 was mainly intended for digital comms - typically sixteen 100 baud TTY channels in each sideband. 
Cheers,
Nick
(phone email acct)


On Nov 11, 2014, at 7:51 AM, Steve Hobensack <stevehobensack at hotmail.com> wrote:

> 
>  Nick, J4-Y works fine. I removed two pins jacks from a 9 pin minature tube socket.  The pins in J4 are the same size as a 7/9 pin minature vacuum tube. I found another pin in J4 that is chassis ground. I soldered up some audio coax, a 0.01 dc blocking cap, a 58k ohm resistor to the pin jacks and pressed on my connections. I started with a 1 meg series resistor, but found out it did not pass enough audio to the sound card through my audio isolation transformer.  I had to go with the 58k resistor. The FLDIGI waterfall is flat and response is out to 3.8 kHz. The pins inside of J4 are labeled, but extremely small. It takes a flashlight and  magnifying glass to read them. Thanks for looking this up for me. My manual is a mess.
> N8YE 
> Date: Sun, 9 Nov 2014 12:33:19 -0500
> Subject: Re: [R-1051] Back Panel Plug Diagram
> From: navy.radio at gmail.com
> To: r-1051 at mailman.qth.net; stevehobensack at hotmail.com
> 
> I went looking at the schematic and probably the easiest place to tap is at the top of the line level control - the signal at that point is directly out of the product detector (in SSB/ISB) and also the AM detector (via just an emitter follower from the detector diode). Or you could pick up that same point under the chassis on the module connector.
> 
> Oh wait! - I apologize - I missed the xmtr sidetone connection on the rear at J4-Y (USB/AM) or J4-X (LSB) - that signal goes to the same point in the audio chain (through a 15uf cap). It is "intended" to be an input, but there's no reason you can't use it as an output.
> 
> As Ray says, the mechanical filters in the IF chain will probably be a limiting factor (although there is some feedback in the audio line drivers that might further shape their freq response). The AM filter is listed as FSN 526-9421-00 Collins F 500 Y 70 AM - so 7 kc wide rather than the 8 or 16 in your R-390A. let us know how it works!
> 
> Apologies if I am repeating stuff that "everyone knows"- I am new to the R-1051 and just started to explore the circuitry.
> 
> Cheers,
> Nick England K4NYW
> www.navy-radio.com
> 
> On Sun, Nov 9, 2014 at 8:14 AM, Steve Hobensack <stevehobensack at hotmail.com> wrote:
> Tks Nick
> 
> N8YE
> 
> 
> > From: navy.radio at gmail.com
> > Date: Fri, 7 Nov 2014 21:06:16 -0500
> > To: r-1051 at mailman.qth.net
> > Subject: Re: [R-1051] Back Panel Plug Diagram
> >
> > Sorry, The rear connectors only have 600 ohm audio out from the AF amps. If you want something earlier you'll have to run a wire into the IF/AF module.
> >
> > Nick
> 
>