[GreenKeys] XR2211 demodulator circuit boards?

[Steve Garrison]

Eric,

If you wouldn't mind sending the gerber files or any other files I'd
appreciate it.  I've been having several other boards that I have designed
for robot project I'm involved with made, so I could add the demod board to
the list.  Is the 2211 still readily available?

Steve G./N4TTY

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net>
On Behalf Of epvgk at limpoc.com
Sent: Sunday, January 24, 2021 3:58 AM
To: hwhall at compuserve.com
Cc: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] XR2211 demodulator circuit boards?

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-2206-1
> 1-12_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/201304161253
> 39_Part5.pdf
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/Harold_018.p
> df
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/201304161253
> 39_Part1.pdf
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/Harold_011.p
> df
> 
> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/201304161255
> 53.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.
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