MIRAGE BD-38-G Dual Band Amplifier
6
During 144MHz / 440MHz crossband full duplex operation, there may be some
minor interferences such as noise on certain frequencies (depending on the
combination of Transmit / Receive frequencies selected). Select TX/RX frequencies
which show no interferences and/or trouble especially with a 144MHz band
transmission and a 440MHz reception. Select frequencies that are not mutually
harmonic.
With some regulated DC power supplies, the output voltage may rise to an abnormal
level, resulting from malfunctions due to RF signal intrusion. Therefore, use a power
supply with sufficient current capacity as well as with good protection against RF
intrusion. If the power supply malfunctions, discontinue operation by turning the
power switch off.
If the amplifiers power cables are connected in reverse polarity, the cables could
sustain damage, especially when your source is a battery. Be sure to check the
polarity before connection!
After confirmation of proper connections, etc., turn the power switch
ON
. Transmit
either a 144MHz or a 440MHz signal to the antenna and confirm the SWR is at the
proper level. Switch the band of operation opposite of the one selected above and
transmit again to confirm that the amplifier has detected the proper band and the
SWR is at the proper level.
To operate the pre-amp, simply turn the switch corresponding to the proper band to
the
ON
position. The LED for this band will light up and indicate that the pre-amp is
in use.
TROUBLESHOOTING:
The Mirage BD-38-G is designed for long, trouble-free performance and should not
require extensive troubleshooting in the field. If difficulty is encountered, check the
following before assuming the amplifier has a malfunction:
1. Loose antenna or power supply connections
2. VSWR of the antenna system
3. Coaxial cables from radio to amplifier, and amplifier to antenna
4. Output voltage of power supply
5. Power output of radio
6. Improper fuse rating
