[GreenKeys] XR2211 demodulator circuit boards?

Sun Jan 24 09:52:56 EST 2021

Steve,

I have a set of boards (TU and power supply) that was sold by a company 
called PEMCO, if my old memory is correct for the ST-5A which was Irv 
Hoff's ST-5 with autostart added.  I would donate them if you think you 
have somewhere that could duplicate them so others could build that.  I 
also have the old Hoff articles from an early QST that talks about 
tuning toroid coils and if followed on this TU, it is nearly as good as 
the HAL ST-6 was!!!  If that cant be done, Eric you can have these 
boards and I'll dig up some toroids to build it.  I don't have a TON of 
the toroids, but I have some left from MANY years of building TU's for 
Navy MARS folks back in the 70's,  I found this set of Pemco boards and 
info for sale and bought it a few years back to share with someone.  If 
you can do this, Steve, let me know and I'll ship the boards to you.

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:
>>>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
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>>>> http://comcents.com/tty/greenkeyssearch.html
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