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PE0PWA > DSP 02.04.95 13:06l 64 Lines 2833 Bytes #999 (999) @ WW
BID : 30294_PI8WFL
Read: DL1EBI DL8DAV DJ7UA DL9NP DH6IAL GUEST DK5RAS
Subj: dsp-93
Path: DB0GOS<DB0QS<DB0ACC<DB0AHA<PI8DAZ<PI8DRE<PI8APD<PI8WFL
Sent: 950402/1037Z @:PI8WFL.#NH1.NLD.EU #:30294 [Enkhuizen] $:30294_PI8WFL
From: PE0PWA@PI8WFL.#NH1.NLD.EU
To : DSP@WW
DSP-93 first experiences.
The dsp-93 kit is a product of cooperation of TAPR and AMSAT.
For detailed information about the kit see the TAPR and AMSAT bulletins.
In Januari 95 the kit arrived. This was a few months later then expected,
but I am pleased that the beta-test team took its time to some almost
all the problems. The kit consists of 2 pcb's, a lot of parts
and a casing. The kit is complete and the extensive manual describes
exactly how to put things together. But you need some experience in
building computer related kits, as the traces on the boards are sometimes
very close and also the manual is clear, it takes time to think twice
before fixing some of the parts.
The hardware is accompanied by 2 disks full of software, including
filters, modems and the development system. To write programs for the
dsp one need understanding of what d-s-p means and a reasonable
knowledge of math is a must.
Building and testing the kit took me a few days. While building was quite
straight forward, the testing posed a 'few minor' problems. It turned
out that all of these problems were simple. The major 'minor' problem
was a solderspot on the 5v-regulator, the island to solder is very small
and may be I started at that place with a to cold iron. The voltage measured
on the board was 12v instead of 5v (No ic's fitted yet). This was repaired
quickly. Next came the testing using the software. The dsp-93 uses
a serial port at 19k and if you set the baudrate to something else in
your communication program, you are looking at strange things.
Procom and other communications software can be used, the software in
the kit includes a program to upload the binairy data to the dsp-93.
What is running at this moment are the windows-programs and dos-programs:
1200b-modem etc. As I am using the PA0HZP oscc-card for packet-radio
instead of a tnc, I had to make some modifications. The 25-pin tnc
connector pins 13 and 25 have been hooked up to the +5v (test-pin on
board-2) and an interface 25-pin to 9-pin is used.
opto-scc dsp-93
9-pin din 25-pin din
1 ---- +5V ------------- +5V --- 13/25 extra internal connection
2 -^ made to +5V
3 -V
4 ---- GND ------------- GND --- 8
5 -^
6 ---- RXD ---- k470 --- RXD --- 9
7 ---- DCD ---- k470 --- DCD --- 1
8 ---- RTS ------------- RTS --- 3
9 ---- TXD ------- | --- TXD --- 10
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4k7 4k7
|____|
+5V == 13/25
This 1200b is running a few weeks now, test at 4k8 and 9k6 will follow.
I hope to see and hear the experiences of other amateurs with dsp's
and exchange information on writing programms, using packet-radio.
73's Piet, PE0PWA @ PI8WFL.#NH1.NLD.EU
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