User's Manual

UV-1G User Manual Rev. O 600MHz US – July 16
th
, 2019 89 of 95
Amplitude Modulation can be demodulated inside of poorly shielded electronics equipment. In fact, all
that is required to demodulate an AM signal is an active electronics circuit; even one that is not related
to RF in the least. In addition, our RAD UV-1G uses direct conversion meaning that there is no
Intermediate Frequency. The RF signal IS the audio signal. This is why you hear some form of the audio
being transmitted on the base station.
Hearing RF fade noise when keying up a belt pack with no head set connected.
The headset cable is the counterpoise for the VHF transmitter antenna. It must be connected for
proper transmission from the belt pack.
Details:
Radio Active Designs belt packs transmit in the VHF band from 174-216 MHz which is TV channel 7
through 13. If we used an external antenna for the belt pack, it would be 16 inches long! Probably
wouldn’t go over too well nowadays.
That is why we designed an internal meander antenna for transmission from the belt pack. We use the
head set cable as the counterpoise for the transmit antenna thus the head set must be connected for
maximum transmission.
Belt pack does not transmit when Channel 1 is not tuned.
The belt pack locks to Channel 1 to ensure a closed loop system. Channel 1 must be turned on in the
belt pack receiver. If you do not want to hear it, turn the volume control down.
Details:
Radio Active Designs wireless intercom systems are u
sed in mission critical operations from Nuclear
power plants to Space vehicle launch communications. We deploy a Costas Loop closed locked loop
system for the side tone. The Costas Loop signal is transmitted on channel 1 of the base station. It is
necessary to tune your belt pack to channel 1 to assure proper lock.
Receiving short range when transmitting from the pack while a short distance away from the base
station.
Check for proper placement of RX antenna in comparison to TX antenna.
Check your operating frequencies.
Check your RF 50ohm Low Loss cables.
Details:
• Check your placement of your base station RX antenna and make sure it is not in front of a TX
antenna or pointed directly and positioned too close to a video wall or another piece of
equipment that puts out high RF noise. RX antennas should be placed high, behind and to the
side of a TX antenna and away from items such as Power Distribution, lighting dimmers and
video walls. TX antennas should be placed high as well.