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

Lucky 225 Lucky225 at 2600.com
Mon Nov 5 05:42:05 CST 2007 

Jerry:

Yea, it's got a little picture of a "D" Battery, but doesn't say + or
-, I figured just put it in the way the picture shows, but wasn't sure
if that was correct or not, either way the contacts must not be
touching.  I'll have to buy a DC power supply and hook up 15v and see
what happens

On Nov 4, 2007 11:37 PM, Jerry Petrizze <t2600 at sbcglobal.net> wrote:
> Lucky 225:
> If you look in the bottom of each battery holder there should be a symbol
> indicating which way the batteries go in.  At least that's the way mine are.
> Also you might try taking the unit out of it's case and put 15V directly
> into the battery plug with a regulated power supply and see if It won't fire
> up that way.
> Jerry.
> ----- Original Message -----
> From: "Lucky 225" <Lucky225 at 2600.com>
> To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
> Sent: Sunday, November 04, 2007 4:38 PM
>
> Subject: Re: [VoIP] Berry 314A trunk test set (correction)
>
>
> > 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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> > > >>>>>> VoIP at ckts.info
> > > >>>>>> http://lists.ckts.info/mailman/listinfo/voip
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> > > >>>>>>
> > > >>>>>>
> > > >>>>>>
> > > >>>>> _______________________________________________
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> > > >>>>> http://lists.ckts.info/mailman/listinfo/voip
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> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>> _______________________________________________
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> > > >>>>
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> > > >>>
> > > >>>
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> > > >>
> > > >
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> > > >
> > > >
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> > >
> > >
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