Kategorier
Satellitnyheter

Satellite config files moved to Github

Different configuration files for SDR Console and IC-705 has now moved to SM0TGUs Lars Thunberg Github at: https://github.com/LarsThunberg/SatelliteConfigurationFiles

The link in the following posts about how to use the files are now direct links to Github:

Kategorier
Satellitnyheter Teknik och hårdvara

AMSAT SA Dual Band 70cm/2M Yagi Mark II

AMSAT SA has launched Mark II of its dual band 70 cm/2 m handheld beam antenna with a new, easier to hold handle and improved coaxial terminations. The Yagi has been retuned for maximum performance in the amateur radio 2 m and 70 cm satellite bands. The coax cable is terminated crimped brass lugs instead of being soldered making it environmentally more robust. The driven element has been adjusted to accommodate the change in the connection. More about the Yagi. The antenna has a 50-ohm designed driver. The Yagi has a unique element called an ’Open Sleeve’ which is a director very close to the driven element. The driven element is sized for 2 m. When operating on 70 cm the ’Open Sleeve’ acts as part of the driven element on 70 cm (the third harmonic of 2 m).

The original concept was developed in 1946 by Dr J T Bolljahn of the Stanford Research institute but was not introduced into amateur radio until the 1950s. The AMSAT SA version is based on a design by DK7ZB with modifications by WB5CXC. The first South African version was a collaboration between Guy Eales, ZS6GUY and Gary Immelman, ZS6YI. It was developed for YOTA 2018 where young people successfully used the antenna operating satellites using hand-held transceivers.

The mechanical structure was redesigned by Gary Immelmann ZS6YI. A choke around the boom was added to isolate the antenna from the coax and reduce the effect human contact has on the antenna. A handle was added on the boom end which makes it more comfortable to hold and further isolates the antenna from the handler. The AMSAT SA Yagi is manufactured in one of Gary Immelmann’s factories in Vereeniging. It has two elements on 145 MHz and 3 elements on 435 MHz.

For its size, the antenna has excellent gain: 145 MHZ: 4.12 dBd or 6.3 dBi and 435 MHz: 6.23 dBd or 8.4 dBi. The Yagi is broadband with measured SWR being almost flat over the entire bands. The antenna is plug and play, no tools are needed except for soldering on a connector to suit the application. It comes complete in a carry bag with full instructions. This antenna can be assembled and dissembled in minutes. The price of the MKII Yagi is R400 for AMSAT SA and SARL members. Non-members pay R500 (approximately $36.75 US). The courier charge is R120 (approximately $9 US, Postnet to Postnet). Ask for a quote for other courier options. Find more details and order forms on http://www.amsatsa.org.za/

[ANS thanks AMSAT SA for the above information]

Kategorier
Satellitnyheter SDR och mjukvara

SatNOGS gr-satellites integration

Daniel Ekman SA2KNG @knglaser has been working with integration of gr-satellites in SatNOGS client. The installation process is described at Daniels GitHub:
https://github.com/kng/satnogs_gr-satellites

I have followed the manual installation instructions and it worked with any problem (a minimal knowledge of Linux is recommended). Below you can see a SatNOGS decode from my station that has been processed by the gr-satellites integration.

This is a great add-on for the SatNOGS station/network! Nice work Daniel!

Kategorier
Satellitnyheter

New DTMF mode on PSAT2

From ANS-122: PSAT2 (NO-104) VHF is alive and new DTMF mode:

Bob Bruninga writes: PSAT2 VHF awoke from an 8 month slumber on 26 Apr 2021. We have no idea why. Its telemetry looks fine. Volts between 6.2 and 7.0 volts (5 NiCds). Exterior temps between -18 and +22 C. See
http://aprs.org/psat2.html

PSAT2 will NOT be in APRS mode but a brand new experimental mode for DTMF uplink and VOICE downlink. So you preload your grid and callsign into a 16 digit DTMF memory in your radio and when the satellite hears this it will assign a QSO number and QSL the grid by voice and then also generate an APRS packet for collection by APRS operators. There is even a way to send back a DTMF QSL so you can make it a 2-way DTMF. contact. Successful DTMF grids and messages will appear on a special URL on the PSAT2 page (above). To QSL, you key in that stations 2 digit QSL number and then dump your pre-loaded QSL DTMF message.
Since this is the first time this transponder is on the air and because a
DTMF uplink takes maybe 4 seconds, we don’t want the uplink saturated by a bunch of newbees initially until we see if it actually works. So read the
docs and be sure you know what you are doing. There is a user operating manual available on the PSAT2 web page:
http://aprs.org/psat2.html

[ANS thanks Bob Bruninga, WB4APR for the above information]

Kategorier
Satellitnyheter

Inactive satellites removed from TLE distribution

The following satellites, marked as inactive, have been removed from this AMSAT-NA TLE Distribution as of April 8 2021. The source is from ANS-101.
A note regarding GRIFEX: according to PE0SAT it is still active.

TISAT – NORAD Cat ID 36799
JUGNU – NORAD Cat ID 37839
AO-71 – NORAD Cat ID 37854
HORYU-2 – NORAD Cat ID 38340
BEESAT-3 – NORAD Cat ID 39135
BEESAT-2 – NORAD Cat ID 39136
TRITON-1 – NORAD Cat ID 39427
DUCHIFAT-1 – NORAD Cat ID 40021
NANOSATCBR1 – NORAD Cat ID 40024
ANTELSAT – NORAD Cat ID 40034
VELOX-1 – NORAD Cat ID 40057
DAURIA DX 1 – NORAD Cat ID 40071
CHUBUSAT-1 – NORAD Cat ID 40300
QSAT-EOS – NORAD Cat ID 40301
GRIFEX – NORAD Cat ID 40379
DEORBITSAIL – NORAD Cat ID 40719
NUDT-PHONESAT – NORAD Cat ID 40900
LQSat – NORAD Cat ID 40958
OUFTI-1 – NORAD Cat ID 41458
Swayam – NORAD Cat ID 41607
AlSat 1N – NORAD Cat ID 41789
ScatSat – NORAD Cat ID 41790
Pegasus-1 – NORAD Cat ID 41846
UCLSat – NORAD Cat ID 42765
LituanicaSAT 2- NORAD Cat ID 42768

Kategorier
Satellitnyheter SDR och mjukvara

UVSQSAT tips från SM4JLX Inge

In Swedish only!
Några tips från SM4JLX runt mottagning av UVSQSat:

Just nu styr jag antennerna med en W7 dator och Gpredict tillsammans med rotcld (hamlib-w32-4.0), använder en Arduino Mega med L298N deivkrets. Rotorprogrammet i Arduino är från K3NG. Inte mycket till antenner ännu och ingen preamp.

IC-9700 är kopplad via USB till en W10 dator som även kör Gpredict för frekvens korrigering, där går även SoundModem för att koda ut BPSK, även UVSQsat Decoder – 0.5 för att sända in telemetrin.
Då man är pensionär numera så har jag kunna följa UVSQsat några dar och testat lite andra förslag på satellit än 2021-006AB.
Problemet är att justeringen av doppler frekvensen inte stämmer för mig och då måste man hela tiden justera i SoundModem vilket område datat kommer att hamna.

Nu har jag kommit fram till följande ordning på de olika satelliter som jag lyssnat på och jag skulle då vilja ha satelliter som kommer in tidigare än 6AB. Det gör följande om man ser på passage idag ca. kl. 15. 6AA 4 sek. före 6AB, 6Z 18 sek. före 6AB, 6Y 80 sek. före 6AB. Vid test så fick jag mot 6Y att radion ställde in sig hela passagen på för låg frekvens.
Mot 6Z så ställde radion in sig på för hög frekvens utom vid närmaste avstånd då det verkar stämma bra.

Testat även 6AA och då ställde radion in sig för hög frekvens hela tiden.
Ska kolla 6AB på samma sätt också men jag tror nog att jag får samma värden som 6AA.

Jag kanske är ute och svamlar, men kul tycker jag det är ändå när man få allt att fungera rätt så bra.

Har även en Linux burk med en FunCube dongel som tar telemetri från Fox satelliterna (1 just nu).

73 de SM4JLX / Inge