[time-nuts] TADD-2 Mini Sine or Square signal input?

John Ackermann N8UR jra at febo.com
Wed Nov 14 13:18:23 UTC 2012


I suspect it will work fine; worst case might be that you add a 3dB 
attenuator, but I doubt you'll need it.  I would test, if you can, to 
see whether the output jitter varies between the full input level and 
something that's closer to 1-2V p-p.

John
----

On 11/13/2012 9:52 PM, Edgardo Molina wrote:
> Dear John,
>
> Your response is welcome. My square signal input is 3.3V and 50% duty cycle.  Low end 0.5V, High end 2.7V.
>
> Will I be able to make it without the bypass? Or should I start warming the soldering station?
>
> Thanks!
>
>
>
> Edgardo Molina
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> On Nov 13, 2012, at 8:21 PM, John Ackermann   N8UR <jra at febo.com> wrote:
>
>> Hello Edgardo --
>>
>> The T2-Mini uses a wide-range input circuit based on one that Wenzel published with some modifications.  It works with a square wave input (I've done some limited testing) but I can't verify whether the input amplitude range will extend as far on either the low or the high side.
>>
>> If you want to drive with a true TTL signal, you could bypass the input circuit entirely and feed directly into the PIC, though that would require some soldering.
>>
>> John
>>
>> On Nov 13, 2012, at 6:48 PM, Edgardo Molina <xe1xus at amsat.org> wrote:
>>
>>> Dear Group,
>>>
>>> Does anybody know is the TAPR TADD-2 Mini works with input signals with square wave geometry? Or Sine wave only?
>>>
>>> Thank you.
>>>
>>> Regards,
>>>
>>>
>>>
>>> Edgardo Molina
>>> Dirección IPTEL
>>>
>>> www.iptel.net.mx
>>>
>>> T : 55 55 55202444
>>> M : 04455 10045822
>>>
>>> Piensa en Bits SA de CV
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