In our April 2022 SARTS meeting Lih Wei, 9V1LW, our payload specialist, gave an interesting report of the last balloon experiment (BEAR 4) and an outlook to BEAR 5.
BEAR-4 Report
Category: SARTS Talks
Talks and presentations
BEAR – Balloon Experiments with Amateur Radio
During the October online SARTS meeting, Chew, 9V1YP, gave a very interesting presentation about the recent two weather balloon experiments.
Ham Radio via Satellites
Hardware, Software, Experiences
SARTS talk by Klaus, 9V1KG, 29th July 2021
Klaus presented his setup and experiences working linear Satellites.
Satellite Audio Samples
Satellite Operation Outdoor Planning SOOP
SARTS Multimode UHF Repeater
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.
FCC Amateur Radio Licensing Guide for Singapore HAMs
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):
Applying the Concept of Earth-Moon-Earth (EME)
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.
The challenge of my location (QTH)
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)
Common Mode Chokes and Baluns
Actual Measurements
SARTS talk by Klaus, 9V1KG, 25th Feb 2021
Klaus shows some actual measurements of common mode rejection, VSWR and losses for common mode chokes and baluns.
US Remote Ham
Escaping the limits of home
SARTS Talk by Solomon, 9V1BC, 25th Feb 2021
Solomon explains how to get a FCC license, what is a remote station, and his experiences operating remotely from Singapore in the US.
Introduction to QSL buro
9V1HY, Haoyuan, Feb 2021
How to send and receive paper QSL cards via the SARTS buro? This service is free for our members. Haoyuan, 9V1HY, gave a presentation in our February 2021 monthly meeting.
Experiences with SDRs and active antennas
9V1KG, Klaus, Feb 2021
The presentation gives an overview on SDRs under $ 200 and active antennas for the HF range, and how to setup a simple and low budget SWL and monitoring station.
Audio samples
Received on 160 m with active loop and RTL SDR with up-converter.
Comparison between signals received on 80 m (YB2BFF) with ICOM 7300 and 5 m whip antenna with loading coil, and RTL-SDR with up-converter, active loop antenna and GQRX software receiver.
PSK Reporter
PSK reporter link to see current stations received.