The US Naval Academy has received IARU satellite frequency coordination for HFsat, a 1.5 U CubeSat with a 15- to 10-meter linear transponder with a 30 kHz bandwidth (uplink 21.4 MHz, downlink 29.42 MHz). The Mode K configuration is reminiscent of the old “RS” series of Russian satellites.
The CubeSat will also carry an APRS digipeater on 145.825 MHz. HFsat is a project to demonstrate the viability of HF satellite communications as a back-up communications system, using HF radios found in a typical Amateur Radio installation or frequently used to support disaster and emergency response communication.
“HFsat will be gravity gradient-stabilized by its full-sized 10-meter half-wave HF dipole with tip masses,” said Bob Bruninga, WB4APR.
A standardized CubeSat VHF communication card based on the popular Byonics MTT4B all-in-one APRS Tiny-Track4 module for telemetry, command, and control is under development at the US Naval Academy. US Naval Academy students are working with Bill Ress, N6GHZ, on the HF transponder card.
VHF
Wouxun KG-UVD1P
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News
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South Africa cancels 2,100 Ham Radio licences
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The Art of the QSO – Jim W6LG Talks About Listening
Situational awareness is discussed in this first episode of The Art of the QSO. Read more
Emergency HF Net Convened in Colombia in Wake of Landslide, Flooding
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App - Mobile
iWSPR TX – WSPR for iOS version 2.8 now available
WSPR WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions. Normal transmissions carry a station’s... Read more
SmartSDR for iOS v2.6.2 Now Available
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Ham Radio License Exam Preparation for Iphone and IPad
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EchoLink for iOS version 2.10.18 is now available
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A New App Visualizes the Radio Waves All Around Us
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Antenna
The 10/15/20 Meter Trap Vertical Antenna
“This antenna project came out very nice. It’s a rugged homebrew multi-band trap vertical antenna that works the 10, 15, and 20 met... Read more
Yagi Antenna 4 antenna elements 5 bands
Yagi Antenna Frequency [Frequency]: 28, 24, 21, 18, 14 MHz Number of elements [Number of elements]: 4 Profit [Gain]: 9.5 – 9.0 dBd suppressio... Read more
Optibeam OB8-4M 8 Element 4 Band
The OB8-4M is an extremely effective, compact and innovative Yagi for the classical four bands 40, 20, 15 and 10m. It is the first trapless Yagi for t... Read more
Diamond HFV-5 – 5-Band (40/20/15/10/6) Limited Space Trapped Dipole
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Overview of the LNR W4OP Loop
NR Precision’s newest antenna market entry is the phenomenal new LOOP antenna designed by a degreed engineer. The W4OP Loop has already received... Read more
Recent Posts
RF-KIT RF2K-S Amplifier – Legal Limit Solid State PA
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HF Clock / Satellite Tracker /Solar Index Touchscreen Terminal
HFClock Internet Based Clock System – 9″ Tiger Maple Frame The HFClockTM represents the industry’s first highly integrated clock designed... Read more
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Comet CAA-500 MK2 Antenna Analyzer Preview
CAA-500MARKII SWR/Impedance Analyzer Highly accurate analog cross needles display SWR and impedance simultaneously. Full color TFT LCD display screen... Read more
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