[VoIP] Berry 314A trunk test set (correction)

Sun Nov 4 18:38:23 CST 2007

Speaking of Berry 314A's, I got one sitting here that I can't turn on.
 I just put in 10 D batteries but it's a no go, I think the contacts
aren't touching the batteries or I got them mixed up, the damn thing
doesn't tell you which way is negative or positive and the contacts
look the same to me (not noticible which one is negative) *sigh*
Anyone wannna take this 314A off my hands that will actually use it?
I'd be glad to get it to someone who can actually have the time to get
it up and running, I'd sell for $50+S&H
On Nov 4, 2007 5:14 PM, Steph Kerman <stfkerman at jps.net> wrote:
> YW.  Another thought Jerry... you ought to verify that the tone that
> DOES appear is on frequency, undistorted and continuous before investing
> much effort in a narrowly focused investigation.
>
> Steph
>
>
> Jerry Petrizze wrote:
> > Thanks Steph:  I will keep you posted.
> > 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 2:57 PM
> > Subject: Re: [VoIP] Berry 314A trunk test set (correction)
> >
> >
> >
> >> Sorry... 0.8V at the input, not 0.4V.
> >>
> >> =SK=
> >>
> >> Jerry Petrizze wrote:
> >>
> >>> 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!!!
> >>>
> >> Perhaps there are two test points for examining the output of each tone
> >> of the pair independently.  Otherwise it would be difficult to evaluate
> >> the tone quality without complex instruments.
> >>
> >> Adding two phase shifted tones of the same frequency would not AFAIK
> >> produce a beat note.  If the tone samples are fetched from EPROM it
> >> seems unlikely a circuit failure could cause this to happen.
> >>
> >>> It does exist in both MF and DTMF. However some of the keys sound
> >>> normal, that's why I thought might be in the key pad logic.?
> >>>
> >> I think the keypad is probably a single contact type rather than dual
> >> contact type.  It's probably scanned by the CPU and interpreted in
> >> firmware without any dedicated logic other than perhaps an input latch
> >> or buffer.  Are the keys that do not work properly the same for both MF
> >> and DTMF?
> >>
> >> Perhaps the contact resistance of the keys has risen to the point where
> >> they do not deliver a valid logic level to the input port.  It sounds
> >> like you have a scope.  I suggest inspecting the keypad terminals to see
> >> whether solid logic 0 and 1 levels are appearing there and whether there
> >> are static levels or whether it is scanned in a matrix.  Remember that
> >> if the input device is TTL, it needs a logic 0 below 0.4V, which is very
> >> close to ground, not 33% of Vcc as for CMOS.
> >>
> >>> And yes without a road map your kind of lost. I will keep digging.Jerry
> >>>
> >> Good luck!  "Write if you get work..."
> >>
> >> Steph
> >>
> >>> ----- 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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> >>>>>>
> >>>>>>
> >>>>>>
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> >>>>>
> >>>>>
> >>>>>
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> >>>>
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