An independent review of this antenna was published in the November 2008 issue of QST Magazine [Ford, Steve, WB8IMY, "SHORT TAKES: Antennas.us 70-cm Satellite Antenna", QST Magazine, November 2008, pg 72].
The UC-4364-328 is a compact Quadrifilar Helix antenna (8 cm/3" OD x 16 cm/6" H) designed to operate through Amateur Radio satellites, without requiring an antenna rotator. The goal of this product is to offer Amateurs with severe space or community restrictions the ability to receive 70 cm HamSat signals, and communicate through orbiting repeaters (transponders). Ham satellites operate cross-band: you will generally need a VHF uplink transmit antenna for 2-way communications. A companion VHF unit is available UC-1464-433.
Useful web pages about Amateur Satellites and relevant polarization are below:
We came across the following webpage while navigating the internet, containing some recordings of satellite signals using the UC-4264-328R (RHCP/Right Hand Polarization version) about a foot (30 cm) above ground level. K6JEB website
contains some real life Amateur Satellite signal recordings. The sound pitch drifts due to the Doppler shift of the rapidly moving satellite platform.
- Frequency range: 435-438 MHz
- Coverage: Omni-directional, Hemispherical
- Polarization: Circular (AR 1 dB)
- Gain: +3 dBic
- Nominal Impedance: 50 ohm (RF)
- Input Power: Under 50 W CW
- VSWR: 2.0 VSWR Plot
- Connector: SMA Female, on the side of cylindrical housing, just above the flange base. Cable assembly may be purchased separately SMA Cables
- Housing 8 cm (3") OD x 16 cm (6") h
- Bottom flange 10 cm (4") OD x 10 mm (0.38") h
- Mounting: 4 screws, M4 (#10-32)
- Operating Temperatures: -40C to +85C
- Weight: 550 g / 1.15 lbs
- Shipping Weight: 750 g / 1.5 lbs
Click here to see DATASHEET
- Does not require a ground plane
- Specifications and prices are subject to change without notice