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$65.00

Broadband Satellite RX Preamp with Antenna Polarization Switch







In response to the popularity of the original Broadband Satellite RX Preamp, we now have a new version which includes the ability to drive two linear antennas such as an Elk or Arrow to achieve either left hand (LHCP) or right hand (RHCP) circular polarization.  What does this mean to the operator?  Any directional antenna must be pointed toward the satellite.  In additon, with a single linear antenna such as an Elk or Arrow, it is necessary to constantly fine tune your reception by twisting the beam for maximum signal strength.  Circularly polarized antennas can dramatically reduce the need for this, but some satellites have circularly polarized antennas which must be "matched" to the ground antenna.  In that case, the change in signal strength can often be dramatic between LHCP and RHCP.  Even satellites with nominally linear antennas can often benefit by switching between the two polarizations.

Since handling two antennas which must be held at a constant spacing and 90 degree angle from each other manually is impractical,  Mark Spence, WA8SME has published an excellent article showing both the new preamp and a typical installation to use its capabilities fully:

WRAPS Rotor Enhancements Add a Second Beam and Circular Polarization

Of course, the new version retains all the features which made its predecessor popular:


Fully assembled, tested, and installed in a metal enclosure with female BNC connectors on input and outputs.
Based on the MAR7 device, this receive only preamplifier (no transmit switching) covers 100 MHz to 500 MHz.  
This includes the137 MHz WX, 2M, and 70cm satellite bands.  
Operates from +9-15V DC (a fresh 9V battery works great!).
Ready to operate--not a kit!  Includes low power (about 5W) protection diode on the input for accidental transmissions into the input.

If you wish to use it with a single antenna, simply use the unit as a preamp without using the second antenna port.

Perfect for portable operations using a dual band hand-held Yagi like the Arrow, Elk, Cheap Yagi, etc.  
Just put it in line on the correct receive band for operations in either mode U/V or V/U.  You won't believe what you've been missing!

NOTE:  This preamp is NOT rf switched.  It MUST be protected from inadvertent transmission RF!

Proceeds from the sale of this item will help fund the AMSAT Fox Family of satellites including the newly announced Fox-1C which will be launched in the 3rd quarter 2015!

AMSAT Store Merchandise is shipped on normal work days, as promptly as possible. However, due to a single person staff and other AMSAT activities, there will occasionally be short delays in handling. International shipping will incur additional transit time.  

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