[GreenKeys] XR2211 demodulator circuit boards?

Sun Jan 24 14:28:11 EST 2021

On Sun, Jan 24, 2021 at 05:31:51AM -0500, Steve Garrison wrote:
> 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
> 

Here are the gerbers and associated stuff for the 2211-based demod that was sold 
on the list a few years back. I believe the 2211 is still available at least in 
smallish quantities. 

This board was designed to be easy to hand assemble and it's single-layer with
no tight tolerances so you can even DIY etch it if you're bored.  Attaching the
digikey parts list too. 

eric

> -----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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