[GreenKeys] XR2211 demodulator circuit boards?

[epvgk at limpoc.com]

On Sun, Jan 24, 2021 at 08:46:10AM +0000, hwhall at compuserve.com wrote:
> I'd encountered some of those pages when I was googling but still no PCB artwork. If someone has already laid them out, I could skip reinventing it.
> 
> WayneWB4OGM

Here's the one I did that got manufactured that people on the list have a bunch of. 

https://www.heepy.net/index.php/RTTY_demodulator_using_NJM2211

I can dig up gerbers or whatever if you want!

eric

> 
> -----Original Message-----
> From: Harold Hallikainen <harold at w6iwi.org>
> To: greenkeys at mailman.qth.net
> Sent: Sat, Jan 23, 2021 11:19 pm
> Subject: Re: [GreenKeys] XR2211 demodulator circuit boards?
> 
> 
> > Are there any printed circuit boards for building an XR2211 based RTTY
> > demodulator? Â Google shows me all kinds of articles from complex to
> > over-simplified but doesn't lead me to any PCB artwork or vendors.
> > I'm thinking I might build a demod to run a Model 15 from a laptop running
> > MMTTY. The program only outputs tones (no on-off output to key a loop
> > directly) so a PLL demod should be fine since noise won't be an issue. Or
> > should I look at something even smaller/simpler?
> > Thanks!WayneWB4OGM______________________________________________________________
> 
> There's an evaluation board at
> https://media.digikey.com/pdf/Data%20Sheets/MaxLinear%20PDFs/XR-2206-11-12_Man.pdf
> . I'd be tempted to wire wrap it, though.
> 
> Several products I did using the XR2211 are at
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/20130416125339_Part5.pdf
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/Harold_018.pdf
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/20130416125339_Part1.pdf
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/Harold_011.pdf
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/20130416125553.pdf#page=11
> 
> The XR2211 is a fun chip. Before that, I used the NE565, but the XR2211
> includes the data comparator, a carrier detect, etc. The XR2206 is also a
> nice chip. It will generate a square wave, triangle wave, and sine waves.
> It can do linear FM, AM (including double sideband suppressed carrier),
> and FSK. The FSK circuit has a logic input that switches between two
> timing resistors. But, during the transition, the frequency goes to zero
> for a very short time. I'd probably use the linear FM circuit and drive it
> with the data after running it through a low pass filter to limit
> bandwidth. It IS a nice chip, though. I used it as an upconverter (local
> oscillator and mixer) to upconvert subcarriers on FM broadcast stations to
> 455 kHz where the signal then went through ceramic filters, IF amplifier,
> and a ceramic discriminator.
> 
> Fun stuff!
> 
> Harold
> https://w6iwi.org
> 
> 
> -- 
> FCC Rules Updated Daily at http://www.hallikainen.com
> Not sent from an iPhone.
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
> 
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to hwhall at compuserve.com

> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
> 
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to epvgk at limpoc.com