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EB1DPI > DSP 11.04.95 02:06l 363 Lines 11748 Bytes #999 (999) @ WW
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Subj: TAPR DSP-93 25/03/95 1/2
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EB1DPI/TPK[BAYCOM]1.81 Msg #:190 26/03/95 22:01Z
From dsp-93@tapr.org Thu Mar 23 17:53 MST 1995
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From: rparsons@bga.com (Ronald G. Parsons)
To: dsp-93@tapr.org
Subject: [DSP-93:515] Re: +- 2.2 V p-p
X-Listprocessor-Version: 6.0 -- ListProcessor by Anastasios Kotsikonas
X-Comment: Tucson Amateur Packet Radio DSP-93 Kit SIG
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Bent,
>I then read the following p-p values (I do use radio port 1):
>
>TP1: +2.2 -2.4 V
>U202-7: +3.6 -4.8 V
>U203-3: +200 -240 mV
>U203-11: +200 -240 mV
>Discriminator output: ~500 mV
>
>These measurements are taken with the scope in DC mode and it turns
>out that the swing is not quite symmetrical. The first measurements
>were taken in AC mode.
Are these values in a situation where you see clipping?
Other than the lower than expected values, is it causing a problem?
We have observed that about 1V p-p at TP1 is all that should be applied to
the AIO chip. Above that value, clipping ocurrs in the digitizing process.
The non-symmetry has been seen before by W0SL.
Roy, does this appear to be similar to the asymmetry you saw. How did you
finally resolve that?
Ron W5RKN
also:
w5rkn@amsat.org
From dsp-93@tapr.org Thu Mar 23 18:48 MST 1995
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From: rparsons@bga.com (Ronald G. Parsons)
To: dsp-93@tapr.org
Subject: [DSP-93:516] Re: +- 2.2 V p-p
X-Listprocessor-Version: 6.0 -- ListProcessor by Anastasios Kotsikonas
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Bent,
>I then read the following p-p values (I do use radio port 1):
>
>TP1: +2.2 -2.4 V
>U202-7: +3.6 -4.8 V
>U203-3: +200 -240 mV
>U203-11: +200 -240 mV
>Discriminator output: ~500 mV
>
>These measurements are taken with the scope in DC mode and it turns
>out that the swing is not quite symmetrical. The first measurements
>were taken in AC mode.
Are these values in a situation where you see clipping?
Other than the lower than expected values, is it causing a problem?
We have observed that about 1V p-p at TP1 is all that should be applied to
the AIO chip. Above that value, clipping ocurrs in the digitizing process.
The non-symmetry has been seen before by W0SL.
Roy, does this appear to be similar to the asymmetry you saw. How did you
finally resolve that?
Ron W5RKN
also:
w5rkn@amsat.org
From dsp-93@tapr.org Thu Mar 23 22:46 MST 1995
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Date: Thu, 23 Mar 1995 15:40:44 -0600
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From: Roy Welch <rdw@crl.com>
To: dsp-93@tapr.org
Subject: [DSP-93:517] Re: +- 2.2 V p-p
X-Listprocessor-Version: 6.0 -- ListProcessor by Anastasios Kotsikonas
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In-Reply-To: <ab975017080210044627@[204.181.160.27]>
On Thu, 23 Mar 1995, Ronald G. Parsons wrote:
> Bent,
>
> >I then read the following p-p values (I do use radio port 1):
> >
> >TP1: +2.2 -2.4 V
> >U202-7: +3.6 -4.8 V
> >U203-3: +200 -240 mV
Isn't the above pin supposed to be -5v supply (U203-3)?
> >U203-11: +200 -240 mV
> >Discriminator output: ~500 mV
> >
> >These measurements are taken with the scope in DC mode and it turns
> >out that the swing is not quite symmetrical. The first measurements
> >were taken in AC mode.
>
> Are these values in a situation where you see clipping?
>
> Other than the lower than expected values, is it causing a problem?
> We have observed that about 1V p-p at TP1 is all that should be applied to
> the AIO chip. Above that value, clipping ocurrs in the digitizing process.
>
> The non-symmetry has been seen before by W0SL.
>
> Roy, does this appear to be similar to the asymmetry you saw. How did you
> finally resolve that?
I'm not sure, but I suggest looking at the DC voltage on U208-8 (REF).
Seems like it was around 3.2 volts, but not sure . Check it for stability.
Also mine cleared up after resoldering C208, the bypass for that pin.
Also push the U208-8 pin while the chip is in the socket and see if any
fluxuations are seen. The voltage on this pin should be very stable.
73, Roy
From dsp-93@tapr.org Thu Mar 23 23:31 MST 1995
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From: rparsons@bga.com (Ronald G. Parsons)
To: dsp-93@tapr.org
Subject: [DSP-93:518] Re: +- 2.2 V p-p
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>On Thu, 23 Mar 1995, Ronald G. Parsons wrote:
>
>> Bent,
>>
>> >I then read the following p-p values (I do use radio port 1):
>> >
>> >TP1: +2.2 -2.4 V
>> >U202-7: +3.6 -4.8 V
>> >U203-3: +200 -240 mV
>
>Isn't the above pin supposed to be -5v supply (U203-3)?
I think he meant U202-3.
Ron W5RKN
also:
w5rkn@amsat.org
From dsp-93@tapr.org Fri Mar 24 00:06 MST 1995
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Date: Thu, 23 Mar 1995 16:58:53 -0600
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From: Simon Lewis <slewis@pacsat.demon.co.uk>
To: dsp-93@tapr.org
Subject: [DSP-93:519] Building .docs for DSP-93 Unit?
X-Listprocessor-Version: 6.0 -- ListProcessor by Anastasios Kotsikonas
X-Comment: Tucson Amateur Packet Radio DSP-93 Kit SIG
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Hello all from a newbie to Internet!
I've been interested in the DSP-93 project for a while. Does anyone have
any doc files on constructing the kit and/or doc files on a more fuller
description than the tapr info I received some time ago.
I'd also like some help on how to get files from the listproc at tapr.
Ive tried a few times and got errors in my replies!
Does the DSP-93 software lie on the tapr ftp site? and if so does it have
doc files descibing the software?
+-------------------------------------------------------------------------+
| 73 From: Simon Lewis GM4PLM - Helensburgh - Strathclyde - Scotland |
| Packet: GM4PLM @ GB7SAN.#78.GBR.EU Email: slewis@pacsat.demon.co.uk |
| AMSAT - UK Member 4282 **** SUPPORT YOUR LOCAL AMSAT GROUP **** |
+-------------------------------------------------------------------------+
From dsp-93@tapr.org Fri Mar 24 01:46 MST 1995
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Date: Thu, 23 Mar 1995 18:29:34 -0600
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From: rparsons@bga.com (Ronald G. Parsons)
To: dsp-93@tapr.org
Subject: [DSP-93:520] Re: Building .docs for DSP-93 Unit?
X-Listprocessor-Version: 6.0 -- ListProcessor by Anastasios Kotsikonas
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>Hello all from a newbie to Internet!
>
>I've been interested in the DSP-93 project for a while. Does anyone have
>any doc files on constructing the kit and/or doc files on a more fuller
>description than the tapr info I received some time ago.
>
>I'd also like some help on how to get files from the listproc at tapr.
>Ive tried a few times and got errors in my replies!
DSP-93 Archive
--------------
Past messages from the DSP-93 list are availble in the TAPR.ORG archives.
Send mail to `listserv@tapr.org` with the following in the message body:
index dsp93
To get files from the archive, send e-mail to 'listserv@tapr.org' with the
following in the message body:
get dsp93 filename
where filename is the name of the file you are request.
Also try:
help
Hope this helps!
Ron W5RKN
also:
w5rkn@amsat.org
From dsp-93@tapr.org Fri Mar 24 04:45 MST 1995
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Date: Thu, 23 Mar 1995 21:41:46 -0600
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From: Bob Stricklin <bstrick@tenet.edu>
To: dsp-93@tapr.org
Subject: [DSP-93:521] Re: "Box" data shipment
X-Listprocessor-Version: 6.0 -- ListProcessor by Anastasios Kotsikonas
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In-Reply-To: <9503222107.0TOKT00@partyline.org> from "wtb@partyline.org" at Mar
22, 95 10:06:23 pm
According to wtb@partyline.org:
>
>
> Bob
> The data from the St. Louis get together has been received and
> is greatly appreciated, however, the disk has only one file on
> it and has no meaning. The file is a directory file of zero bytes
> and the rest of the disk is blank?????
> Bill N0LIK
>
Is this a bad news message or what? Does not sound like something I can
blame on American.
I have one of the disk here and it looks fine. Make that two disk that I
have which look fine.
Hopefully yours just did not copy. If I post the diskas a ZIP file on the
FTP site for TAPR can you get it this way?
Do others have this problem?
Bob Stricklin, N5BRG
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