[GreenKeys] XR2211 demodulator circuit boards?

John Hargett kg5ylg at austin.rr.com
Sun Jan 24 14:21:22 EST 2021 

Might be volunteering,

I have a program that I use to convert pdf and other files to a DXF to 
import into autocad for running parts on a cnc punch or plasma, I dont 
see why I couldnt do the same with the boards, scan them as a PDF or 
JPEG and convert , import and then be able to create the Gerber files.  
Plus we just added Fusion 360  to our cad systems, which includes full 
version of EAGLE-Premium, so would give me something to try on it.   
Would be willing to attempt this if you would like.   Never can have too 
many TU around.


John

KG5YLG


On 1/24/2021 11:33 AM, John, W9DDD wrote:
> Not volunteering, but there are CAD programs that can take an image 
> (e.g.jpeg), import it and create gerbers.  Not automatically, you need 
> to place pads and traces over the imported image that is a layer 
> behind the active layer.
>
>
>
> John, W9DDD
>
> On 1/24/2021 11:18 AM, Steve Garrison wrote:
>> Well, right now I wouldn't be able to tackle that.  That is why I 
>> sent the note to Eric about the Gerber files.  Those I might be able 
>> to squeeze in with a shoehorn.
>>
>> Steve G./N4TTY0
>>
>> -----Original Message-----
>> From: greenkeys-bounces at mailman.qth.net 
>> <greenkeys-bounces at mailman.qth.net> On Behalf Of Don Cunningam
>> Sent: Sunday, January 24, 2021 9:53 AM
>> To: greenkeys at mailman.qth.net
>> Subject: Re: [GreenKeys] XR2211 demodulator circuit boards?
>>
>> 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/20130416125
>>>> 3
>>>> 39_Part5.pdf
>>>>
>>>> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/Harold_018.
>>>> p
>>>> df
>>>>
>>>> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/20130416125
>>>> 3
>>>> 39_Part1.pdf
>>>>
>>>> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/Harold_011.
>>>> p
>>>> df
>>>>
>>>> http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/20130416125
>>>> 5
>>>> 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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>>>> https://teletype.net/gksearch
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>>>> http://comcents.com/tty/greenkeyssearch.html
>
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