[VoIP] Berry 314A trunk test set

[Jerry Petrizze]

I feel the same way, why the beat note?  But if there is two parallel
processes going on which you would expect,  is it possible that it is
generating the same tone on both channels with just a slight time shift
enough to create the beat.?  Beats me!!!
Jerry

----- Original Message ----- 
From: "Steph Kerman" <stfkerman at jps.net>
To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
Sent: Sunday, November 04, 2007 1:38 PM
Subject: Re: [VoIP] Berry 314A trunk test set


> Very hard to say what the problem is without seeing a schematic.  Some
> time back Paul doped out some superficial aspects of how it generates
> tones.  IIRC it uses a digital technique based on parallel output shift
> registers with weighted resistor values to perform a D/A function.
> Presumably there would have to be 2 such implementations, with analog
> summing otherwise the sample values would have to be summed.... probably
> beyond what they would attempt with a 6800 family CPU.
>
> If only one tone is present, how can it be that you hear a beat note?
> That seems contradictory.
>
> Is the problem evident on all keys in both MF and DTMF modes?  Specific
> keys only?
>
> Steph
>
> Jerry Petrizze wrote:
> > Thank you anyway Paul since I did not have the Ops. manual for it ether.
> >
> > Steph: Everything seems to work on it except the tones are messed up.
> > Like when you press the # one key in the MF mode you hear a beet note
> > and one tone. If you look at the test point where the tones can be
> > checked you just see one tone being generated. I believe the problem
> > lies in the key pad interpolation circuitry.???
> > Jerry P.
> >
> >
> > ----- Original Message -----
> > From: "Steph Kerman" <stfkerman at jps.net>
> > To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
> > Sent: Sunday, November 04, 2007 12:42 PM
> > Subject: Re: [VoIP] Berry 314A trunk test set
> >
> >
> >> Same experience here.  What is the problem with it?
> >>
> >> =SK=
> >>
> >> Paul Wills wrote:
> >>
> >>> Oops, I guess you meant documentation for maintenance. Good luck. I
was
> >>> never able to get anything like that out of Berry.
> >>>
> >>> PDW
> >>>
> >>> ----- Original Message -----
> >>> From: "Jerry Petrizze" <t2600 at sbcglobal.net>
> >>> To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
> >>> Sent: Sunday, November 04, 2007 3:36 PM
> >>> Subject: [VoIP] Berry 314A trunk test set
> >>>
> >>>> Help!!! Needed, service documentation on a Berry 314A Trunk Test Set.
> >>>> Thank you Jerry Petrizze
> >>>>
> >>>>
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