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.
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
Hardware, Software, Experiences
SARTS talk by Klaus, 9V1KG, 29th July 2021
Klaus presented his setup and experiences working linear Satellites.
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.
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.
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
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
Last updated: 2025-07-01
| 9V1AB | Nils Christian Ujma | |
| 9V1AD | Cheuk Yan Au (Chuck) | x |
| 9V1AE | Karthik Raj Nachiappan | x |
| 9V1AI | V. Jayaram | x |
| 9V1AK | Matt Ranostay | x |
| 9V1AM | Jason Ingram | x |
| 9V1AS | Jeff Yeo | x |
| 9V1AT | Andrew Tan | x |
| 9V1AV | James Tan Chun Chieh | x |
| 9V1AW | Aaron Wong | x |
| 9V1AX | Kelem Amir | |
| 9V1AY | Mark Barnard | x |
| 9V1AZ | Gopalan Vedartham | x |
| 9V1BC | Solomon Tan Wei Jie | x |
| 9V1BD | Ho Jie Feng | |
| 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 | |
| 9V1CB | Dr Yee Ching TOK | x |
| 9V1CE | Kevin W Rogers (KF7TUU) | x |
| 9V1CK | Claus J Karthe | x |
| 9V1CQ | Maximilian Boetcher | x |
| 9V1CU | Seth Block | x |
| 9V1CV | Choong Sek Yeen | x |
| 9V1CW | Colin J. Paul | x |
| 9V1DA | Diego Abas | x |
| 9V1DE | Darryl Ee | x |
| 9V1DK | Derrick Ian Ling | x |
| 9V1DT | Sampath Kumar Padmanabhan | x |
| 9V1EH | Liu Chang | |
| 9V1EK | Eddy Kok | x |
| 9V1EP | Masakazu Namajiri | x |
| 9V1FH | Thum Fu Hang | x |
| 9V1FJ | Barry Fletcher | x |
| 9V1FL | Francis Lim | |
| 9V1GH | Sanjeev Gupta | |
| 9V1GZ | Guenter Zwickl | |
| 9V1GW | Alex Voss | x |
| 9V1HF | Koenraad Mouthaan | x |
| 9V1HH | Amos Hoe | x |
| 9V1HL | Herman Lahey | x |
| 9V1HP | Harish Pillay | x |
| 9V1HX | Alvin Siah | x |
| 9V1HY | Haoyuan Chu | |
| 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 | |
| 9V1KD | Nick Anskombe | 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 |
| 9V1LD | Larry Mangilaya Dimaano | x |
| 9V1LH | Stephan Grensemann | x |
| 9V1LW | Chia Lih Wei | x |
| 9V1LX | Mike Easterbrook | |
| 9V1LY | Li Yu | |
| 9V1MJ | Murali S/O Jothinathan | |
| 9V1NM | Mantha Nikhil Bhardwaj | x |
| 9V1OD | Tan Lian Huat | x |
| 9V1OG | Rene Atienza Ogie | x |
| 9V1PK | Peter Khor | |
| 9V1PL | Lai Yong Yeow Philip | x |
| 9V1PP | Andrew Lee | |
| 9V1RB | Ragul Balaji | |
| 9V1RC | Robert Chen | |
| 9V1RF | Ross French | |
| 9V1RK | Robert Kimmel | x |
| 9V1RT | Roland Turner | x |
| 9V1SA | Hugh Maison | x |
| 9V1SH | Shuichi Hosokai | x |
| 9V1SO | Sri Narayan Shukla | x |
| 9V1ST | Tan Hoe Teck | x |
| 9V1SV | Azhaga Muthu Siva | x |
| 9V1TG | Timothy Goh | x |
| 9V1TK | T. Kasahara, Kasa | x |
| 9V1TT | Andrew Hodges | |
| 9V1VV | John Davies | |
| 9V1WP | Sai Wai Phyo | |
| 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 | |
| 9V1ZY | Loo Zheng Yuan | |
| BG5IMH | Tao Zhu | |
| OE3OGC | Sebastian Schiegl, Orion (Assoc.) | x |
| Assoc. | Ong Jun Xi | x |
| Assoc. | David Tan Qian Ting | |
| Assoc. | Oshada Rodrigo | |
| Assoc. | Cynch Guevara (Ms.) |
Stephan, 9V1LH, is working on the hard- and software of our UHF repeater. He presented the status during our April 2020 SARTS online meeting. See his presentation slides below.
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 σφ .
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.
σφ 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
by 9V1DT, April 2021
A short guide by Sampath how to prepare for and get the FCC license. The US FCC license is well recognized world wide and sometimes can be helpful to get a visitor’s ham radio license abroad.
One page guide as pdf (9V1YP):
by Philip Lai, 9V1PL
This article was motivated by my fellow HAMs from the satellite group. Based on my success with the application of the concept of EME on 2 m to our SARTS Repeater without line of sight, I hope this write up can help those in the hobby with similar challenges to explore the concept of EME.
Earth-Moon-Earth communication (EME), also known as moon bounce, is a radio communications technique, which relies on the propagation of radio waves from an earth-based transmitter directed via reflection from the surface of the moon back to an earth-based receiver.
I am located at the South Eastern Coast of Singapore, an apartment dweller with low elevation of 25 m facing south west. The distance to the Singapore VHF repeater is approximately 12 km. The small balcony with an opening of just slightly over 100 degrees is surrounded by tall buildings and makes it difficult for me to reach the repeater located at Dover.
For many months, when I first started as a new HAM, all I could hear was noise from my handheld (HT).
Each time I pushed the PTT, I couldn’t trigger the repeater, but even when I could trigger the repeater, I couldn’t hold it transmitting. It was frustrating, I fully understand, if you are facing similar challenges.
Continue reading Applying the Concept of Earth-Moon-Earth (EME)
