|
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 envisioned in the near future.
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.
NOTE: We have been asked a number of times about a companion VHF QFH. We are hoping to make the 2m model available around late January/early February 2009 (our future model UC-1464-433). Thank you for your inquiries and positive feedback on this tiny QFH Antenna.
SPECIFICATIONS:
- Frequency range: 435-438 MHz
- Coverage: Omni-directional, Hemispherical
- Polarization: Circular (AR 3 dB)
- Gain: +3 dBic
- Nominal Impedance: 50 ohm (RF)
- Input Power: 50 Watt CW
- VSWR: 2.0 GRAPH
- Connector: Type-N, Male
- Dimensions:
- 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
NOTES:
- Does not require a ground plane
- Specifications and prices are subject to change without notice
- Patent Pending
- CAUTION: Contains PVC plastic. Not for aircraft use
|