archive: SETI * SpaceNews 03-May-99 *

SETI * SpaceNews 03-May-99 *

Larry Klaes ( )
Fri, 07 May 1999 13:19:23 -0400

>Subject: * SpaceNews 03-May-99 *
>Date: 3 May 1999 21:33:53 GMT
>From: (John A. Magliacane)
>Organization: Brookdale Community College
>* SpaceNews 03-May-99 *
>BID: $SPC0503
> =========
> SpaceNews
> =========
> MONDAY MAY 3, 1999
>On April 26, 1999 between 2100 and 2151 UTC, Peter, KD7MW of Seattle,
>U.S.A. and Frank, DL6DBN of Siegen, Germany had a 2-way QSO on the
>AMSAT-OSCAR-10 satellite using G3PLX's PSK31 software.
>As Peter's earlier one-way test indicated, both stations really had to
>work for it, compensating for transponder frequency shift, QSB and QRN.
>The QSO was far from conversational, but it was a start!
>Peter feels that if PSK31 (or a mode derived from it) is optimized for
>satellite use particularly with regard to frequency control, some nice
>possibilities will open up. His tests show that when tuned in well,
>PSK31 can copy nicely through the very low S/N ratios experienced on
>OSCAR 10.
>If anyone else would like to schedule a PSK31 contact with Peter via
>satellite, feel free to contact him via e-mail at:
>Frank, DL6DBN adds that it is of great importance to tune correctly
>to the received signal (within 2 Hz) which for older synthesized
>receivers (with 20 Hz tuning steps) is only possible with a combination
>of the downlink receiver tuning and software carrier frequency tuning.
>Both methods are not handy so far. What is needed is a fast AFC
>loop and automated receiver tuning controlled by the PSK31 decoding
>If the PSK31 reception software is properly locked to the correct
>frequency, reception is good. With a PC and soundblaster, Frank
>compares it to CW in a narrow filter of 200 Hz. One must be able
>to at least hear a bit of the PSK31 signal to tune it in.
>As the contact between Peter and Frank showed, QRP is poor for contacts
>via AO-10. Frank operated with an EIRP of 300 to 350 watts while
>Peter ran about 1000 W EIRP. Frank could copy almost 50 % of Peter's
>transmission correctly while Peter read only parts of Frank's
>Two days before the contact, Frank could copy his own full-duplex signals
>at apogee from a second PC better (60 % copy). Frank assumes lower
>Doppler-shift at apogee was the reason for his success.
>Frank also feels that while PSK31 might be difficult on AO-10 with its
>unstable transponder, it could be great on Phase 3-D. For LEO satellites
>with their high Doppler-shift, modifications to PSK31 will be
>for any success.
>Frank expects to conduct further tests at different mean anomalies and
>elevation angles.
>Further information on PSK31 may be found at the following URL:
>[Info via Peter KD7MW, and Frank DL6DBN]
>* RS-13 NEWS *
>Harry Bryant, AA2WN reports that Gordon, 6Y5GH, was active last weekend
>on RS13 from Kingston Jamaica. Harry had a very nice QSO with Gordon and
>Gordon had an excellent signal on the bird.
>[Info via Harry Bryant, AA2WN]
>This is the second call to authors who wish to present papers at
>the 17th AMSAT-NA Annual Meeting and Space Symposium to be held
>October 8-11, 1999 at the Hanalei Hotel in San Diego, California.
>Symposium presentations will also be printed in the official
>Proceedings document. You do not need to be a member of AMSAT-NA
>to present a paper or attend the Symposium.
>The subject matter should be topics of interest to the Amateur Radio
>satellite service. Key dates for submitting papers are as follows:
>One page abstracts due and should be submitted
>as soon as possible for consideration.
>June 1, 1999 - authors will be advised if accepted
>August 1, 1999 - camera ready copy of accepted papers due
>Abstracts should be sent to Symposium chair Duane Naugle, KO6BT,
>via email at:
>or via terrestrial mail to:
> Duane Naugle, KO6BT
> 4111 Nemaha Drive
> San Diego, California 92117-4522
>Proceedings of the Symposium will be printed by the ARRL and made
>available at and immediately after the meeting. If authors do not
>wish to present a paper but have a topic of interest, please submit
>the topic and arrangements may be made for a stand-in presenter.
>Receipt of submissions will be confirmed.
>Additional information may be found at
>[Info via Duane, KO6BT]
>Masa, JN1GKZ in Japan last fall found some AO-10 spin rate data and
>plotted it on a graph. He found that AO-10's spin rate is not constant,
>but rather varies up and down. The spin rate was increasing at last
>fall, and started decreasing around last December.
>Masa would like to hear from those who have spin rate or spin period
>data to share so he can further his study. He promises to plot the
>data received on an AO-10 spin rate web page he is creating at the
>following URL:
>[Info via Masa, JN1GKZ,]
>Although digitalker operation was planned to begin on Wednesday 28-Apr-99,
>it had to be postponed until Friday 30-Apr-99 because of the poor
>efficiency in uploading the voice data to the satellite.
>The FO-29 operating schedule for the month of May is as follows:
>Fri 30-Apr-99 0600 UTC - Mon 10-May-99 0400 UTC : Digitalker
>Mon 10-May-99 0400 UTC - Mon 17-May-99 0300 UTC : Mode JA
>Mon 17-May-99 0300 UTC - Mon 24-May-99 0400 UTC : Mode JD (1200 baud)
>Mon 24-May-99 0400 UTC - Mon 31-May-99 0300 UTC : Mode JA
>[Info via Kazu Sakamoto, JJ1WTK]
>For those who receive this issue of SpaceNews a day early, NASA's
>Goddard Space Flight Center will begin the celebration of it's 40th
>anniversary on 02-May-99. The Goddard Amateur Radio Club will be
>operating a special event station from the club station, WA3NAN
>on Sunday 02-May-99. Operations will take place on one or more
>of the following frequencies +/- QRM and depending upon propagation:
> 7185 kHz
> 14295 kHz
> 21395 kHz
>The hours of operation will be from 1400 UTC to 2000 UTC.
>[Info via Ron Parise, WA4SIR]
>* SpaceNews NEWS *
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