Postings – Page 5 – Singapore Amateur Radio Transmitting Society

Northern California DX Club

Special Event 75th Anniversary

On October 10, 2021 the Northern California DX Club will celebrate our 75th year! To mark this milestone we will hold an HF Special Event on the weekend of October 9th and 10th, 2021. Using our call sign W6TI we can be found operating on bands 15, 17, 20, and 40 meters and using SSB, CW and FT8 modes. The festivities begin at 16:00-23:59Z October 9th and continue 16:00-23:59Z Sunday October 10th.

A special QSL card will be available upon request. QSL details at W6TI on QRZ.com.

Since October 10, 1946 the Northern California DX Club has been dedicated to the finest ideals of good DXing, raising the standards of Amateur Radio practice and ethics and interactively sharing knowledge and information to enhance and benefit the Amateur Radio Community.

NCDXC has co-hosted the International DX Convention for over 70 years.

Received from Tony Dowler, K6BV
President NCDXC

9V1UP – Balloon Start from Singapore

Singapore West coast park 23:30 h

23:54 It’s up!

Unfortunately, the last packet received was at 23:48, before the connection was lost.

Balloon Experiments – 9V1UP-11

Saturday 4 Sep 2021 23:00H / 15:00Z. APRS on 144.390 BEACON only.

Join the fun hunting for the APRS signals after launch. The balloon is estimated to be in the air for a few hours. Signals are likely to be received in the region: Singapore, Johor, and Riau. For the past few months, a team of Singapore hams have worked on a project to launch a weather balloon carrying amateur radio. The flight system consists of a 600g weather balloon filled with Helium (industrial grade) and the payload is assembled from a LightAPRS tracker. Approval of flight involved “no objection” from CAAS, RSAF and IMDA, and Saturday’s flight requires release clearance from RSAF duty controller. For launch, two teams will be deployed in the western side of Singapore. The launch team will attend to the lift off while the remote monitoring team will receive and iGate the APRS signals.

Tracker: https://9v1up.ragulbalaji.com/tracker/

Updates: Ham Radio SG on Facebook

The project team is busy preparing for the launch and may not have time to answer questions that you may have. A presentation will share various aspects of the project at the next SARTS meeting. Come this Saturday, share in comments when you receive 9V1UP-11, stating your QTH and telemetry.

Source: 9V1YP

Ham Radio via Satellites

Hardware, Software, Experiences

SARTS talk by Klaus, 9V1KG, 29th July 2021

Klaus presented his setup and experiences working linear Satellites.

Satellites-9V1KG presentation (pdf)Download

Satellite Audio Samples

Hope 1 CW telemetry

TO-108 – some strange tones before the CW transmission starts

Athenoxat-1 – Singapore Satellite from Giulio, 9V1FC

Calling CQ on RS-44 – right channel: CW side tone, left channel: signal from the satellite. Clearly to hear the Doppler shift.

RZ0CQ calling in CW via RS-44

Tunig in my SSB signal

CQ SSB – right channel: Up link, left channel: Downlink

JA3IKC answering my call

Nayif-1 telemetry signal 1K2 BPSK

Satellite Operation Outdoor Planning SOOP

https://github.com/9V1KG/soop

IARU HF World Championship 2021

From Sat, July 11, 12:00 z (20:00 SGT) to Sun, July 12, 11:59 z (19:59 SGT) the international IARU HF World Championship takes place. Details and rules are given on the ARRL website.

SARTS will participate with a IARU Member Society HQ Station under the call sign 9V1HQ. We hope to see a good participation.

Membership fees and donations from overseas

If you want to renew/apply for SARTS membership from overseas and you don’t have an SGD bank account, please use the information below.

Transferring of SGD only from overseas:

Beneficiary Bank Information (mandatory)

Bank Name: Oversea-Chinese Banking Corporation Limited
Address: 65 Chulia Street, OCBC Centre, Singapore 049513
SWIFT Code : OCBCSGSG

Beneficiary Information (mandatory)

Account Name: SARTS
Account No: 524701182001

Transferring of USD from overseas:

Same as above plus:

Intermediary/Correspondent Bank Information for USD only

Bank Name: JP Morgan Chase Bank
Address: 1 Chase Manhattan Plaza, New York, NY 10015, USA
SWIFT Code: CHASUS33

SARTS Membership List

Last updated: 2024-02-17 – All non paying ex-members removed.

9V1AB	Nils Christian Ujma	x
9V1AD	Cheuk Yan Au (Chuck)	x
9V1AI	V. Jayaram	x
9V1AK	Matt Ranostay	x
9V1AS	Jeff Yeo	x
9V1AT	Andrew Tan	x
9V1AV	James Tan Chun Chieh	x
9V1AW	Aaron Wong	x
9V1AX	Kelem Amir	x
9V1AY	Mark Barnard	x
9V1AZ	Gopalan Vedartham	x
9V1BC	Solomon Tan Wei Jie	x
9V1BD	Ho Jie Feng	x
9V1BG	Achala Darshana Senaranta	x
9V1BK	Kenneth Tan Xinrong	x
9V1BM	Sanjeev Gopal	x
9V1BO	Baino Paul	x
9V1BX	Samuel (Sam) Lau	x
9V1BZ	Gabriel Gabe	x
9V1CB	Dr Yee Ching TOK	x
9V1CE	Kevin W Rogers (KF7TUU)	x
9V1CK	Claus J Karthe	x
9V1CV	Choong Sek Yeen	x
9V1CW	Colin J. Paul	x
9V1DA	Diego Abas	x
9V1DE	Darryl Ee	x
9V1DT	Sampath Kumar Padmanabhan	x
9V1EH	Liu Chang	x
9V1EK	Eddy Kok	x
9V1EP	Masakazu Namajiri	x
9V1FH	Thum Fu Hang	x
9V1FJ	Barry Fletcher	x
9V1FL	Francis Lim	x
9V1GH	Sanjeev Gupta	x
9V1GZ	Guenter Zwickl	x
9V1HF	Koenraad Mouthaan	x
9V1HH	Amos Hoe	x
9V1HL	Herman Lahey	x
9V1HP	Harish Pillay	x
9V1HX	Alvin Siah	x
9V1HY	Haoyuan Chu	x
9V1JH	Aaron Pok	x
9V1JM	Joey Muncada	x
9V1JN	Jothinathan G. S. Sundram	x
9V1JO	Johari Osman	x
9V1JT	Jose Carlos (JC) Cortez Tupaz	x
9V1KA	Amon Saka Kaneko	x
9V1KG	Klaus D Goepel	x
9V1KM	Kevin Basil Magnus (Mag)	x
9V1KT	Kevin Tan	x
9V1KV	Kishore Vejju	x
9V1LB	Lawbin Ang Wen Law	x
9V1LC	Choong Lee Song	x
9V1LH	Stephan Grensemann	x
9V1LW	Chia Lih Wei	x
9V1LX	Mike Easterbrook	x
9V1LY	Li Yu	x
9V1MJ	Murali S/O Jothinathan	x
9V1NM	Mantha Nikhil Bhardwaj	x
9V1OD	Tan Lian Huat	x
9V1OG	Rene Atienza Ogie	x
9V1PK	Peter Khor	x
9V1PP	Andrew Lee	x
9V1RB	Ragul Balaji	x
9V1RC	Robert Chen	x
9V1RF	Ross French	x
9V1RK	Robert Kimmel	x
9V1RT	Roland Turner	x
9V1SA	Hugh Maison	x
9V1SH	Shuichi Hosokai	x
9V1ST	Tan Hoe Teck	x
9V1SV	Azhaga Muthu Siva	x
9V1TG	Timothy Goh	x
9V1TK	T. Kasahara, Kasa	x
9V1TT	Andrew Hodges	x
9V1VV	John Davies	x
9V1WP	Sai Wai Phyo	x
9V1XB	Patrick Tham	x
9V1XX	Kazuhiko Kurita	x
9V1YC	James Brooks	x
9V1YJ	Shigeyoshi Sasaki	x
9V1YL	Sally Woon	x
9V1YP	Chew Lip Heng	x
9V1YW	Yingwang Shi	x
9V1ZH	Tan Boen-Hian	x
9V1ZK	Fred Lee	x
9V1ZP	Ziyue Pan	x
9V1ZV	Daniel Wee	x
9V1ZW	Michael Davidson	x
9V1ZY	Loo Zheng Yuan	x
BG5IMH	Tao Zhu	x
Assoc.	David Tan Qian Ting	x
Assoc.	Oshada Rodrigo	x
Assoc.	Sri Narayan Shukla (VU2SHO)	x
Assoc.	Alex Voss	x
Assoc.	Cynch Guevara (Ms.)	x

SARTS membership list 2024
x = paid 2024

Ionospheric Scintillation

Radio signals passing through the ionosphere can be affected by small irregularities of the ionospheric plasma. This phenomenon is called radio scintillation and can strongly disturb or disrupt the signal transmission. As a result it can prevent a GPS receiver from locking on to the signal and can make it impossible to calculate a position. Less severe scintillation conditions can reduce the accuracy and the confidence of positioning results.

Transionospheric radio scintillation is statistically characterized by two parameters, amplitude and phase fluctuations indices, denoted respectively by S₄ and σ_φ.

S₄ is defined as the ratio of the standard deviation of signal intensity and the average signal intensity. Amplitude scintillations are prominent near the geomagnetic equator. They almost appear regularly in the evening hours.

σ_φ is defined as the standard deviation of a linearly detrended phase data segment. Phase scintillations are prominent in high latitudes, and their occurrence rate increases with geomagnetic activity.

SARTS received a request for statistics or help in acquiring statistics of ionospheric scintillation in the VHF range. VHF is not a common frequency range used in space infrastructure and there seems to be a lack of statistics in the area between tropics, where the ionosphere is bubbling quite frequently.

For interest or feedback, please comment below or contact the webmaster (9V1KG).

Sources:

https://www.swpc.noaa.gov/phenomena/ionospheric-scintillation
https://swe.ssa.esa.int/tio_sci
https://www.nasa.gov/mission_pages/cindi/scintillation.html