[GreenKeys] XR2211 demodulator circuit boards?

Sun Jan 24 09:57:28 EST 2021

By the way, the ST-5AS does NOT use the 2211, but uses 741 Op Amps and 
descrete components that are easily sourced except maybe the toroids.

73 Don, WB5HAK

On 1/24/2021 4:31 AM, 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
>
> -----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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>>>> 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:
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>>>> http://comcents.com/tty/greenkeyssearch.html
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