User`s Manual - Unified Microsystems
Contents
1. Unified Microsystems BT 75 Beverage Transformer User s Manual Revision 1 00 September 2014 Specifications Size 3 75 X 2 25 X 1 5 Feed line impedance 75 ohm Antenna feed impedance 450 ohms Connector type F Overview Beverage antennas are excellent low noise receive only antennas Properly built Beverage antennas have excellent rejection of signals and noise from the non favored direction For information on constructing your Beverage antenna ON4UN s Low Band DXing or the ARRL Antenna Book are recommended Beverage antennas have a typical impedance of 450 ohms For best performance this must be matched to the coaxial feed line The BT 75 is designed to be with 75 ohm RG 6 coax cable RG 6 is designed for TV use Because of this it is produced in very large quantities and thus inexpensive Coax designed for TV must have low loss at VHF and UHF frequencies Because of that it will have very loss loss at the 160 80 and 40 Meter band frequencies For this reason RG 6 is the most popular feed line for Beverage antennas The BT 7 has a gas discharge tube across the antenna terminals to help protect the transformer from lightning strikes in the area While this provides protection it will not protect against direct or close by hits Warning Always disconnect your Beverage antenna from the radio when storms are possible Never transmit into the BT 75 Installation 1 Mount the BT 75 on the support for the feed2. end of the Beverage wire 2 Attach the Beverage wire to one of the screw connections with the wing nut The wire should have a strain relief before connecting to the BT 75 It does not matter which screw the wire is connected to 3 Attach the ground wire to the remaining screw 4 Connect the RG 6 F connector to the BT 75 F connector Cover the connectors with electrical tape or other weather sealing method Warranty Information Unified Microsystems warrants the components workmanship of the BT 75 for a period of 1 year from the date of purchase A copy of the receipt must be included with any units returned for warranty repairs Unified Microsystems will at its option repair or replace defective units returned during the warranty period Unified Microsystems reserves the right to change specifications of it products at any time without notice If you have questions or need help email w9xt unifiedmicro com Please put BT 75 in the subject line for fastest response Unified Microsystems PO Box 133 Slinger WI 53086 www unifiedmicro com
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