User's Manual

UV-1G User Manual Rev. O 600MHz US – July 16
th
, 2019 88 of 95
In this manner, if you hear yourself in your own headset, then you can be assured that everyone else
on the intercom system heard you as well. This is not the case with digital wireless intercom systems.
Due to the latency of these digital systems, a local side tone is used. This means that you will hear
yourself perfectly in your own head set but there is no guarantee that anyone else on the comm
system heard you at all. Radio Active Designs uses a “Costas Loop” to ensure that your side tone is a
true representation of what everyone else is hearing. The sweeping tone in the belt pack is the receiver
looking for the transmitter signal to lock to.
Issues connecting the link cable.
Make sure that all base stations are in “Master” mode and make all settings. Connect the cable and
cycle power on the base stations. If using one to five “slave” base stations, make all setting in the
“Master” Mode then change to “Slave”. Again, cycle power on all base stations with the link/sync
cables connected.
Details:
Using the Sync cable on the rear panel of the Radio Active Designs UV-1G base station opens a world of
possibilities. When all your base stations are synchronized with each other, any belt pack may be tuned
across any two transmitter channels regardless of which set of base stations the transmitters are tuned
to. In this manner, one may set multiple belt packs on to any set of two RF PL channels.
This is achieved by synchronizing the clock pulse of the Costas Loop mentioned above. When
implementing Sync, the top unit in the rack provides the clock signal for all the base stations below it,
or fed to it. This means that all the other base stations are seeking their internal clock sync from that
first unit in the sync chain.
Once all the sync cables are connected, it is necessary to cycle power on all the base stations starting
with the primary unit. This will establish the clock synchronizer pulse for the rest of the units. The units
must be powered up in sequence from top to bottom so that each unit being powered up will sense
the clock sync from the unit that is feeding it.
Hearing sounds of low level, distorted cross talk fr
om the RAD on to my wired comm system.
You may be getting AM radiating RF on your wired comm through poorly shielded chassis or cable.
Keep all systems powered up and disable the base transmitters. Get some distance between the base
transmitter antenna and the wired comm cables and chassis. Also, use only the amount of RF power
out of the base as is required for the task at hand. You rarely need to use 250 milliWatts.
Details:
Radio Active Designs implements Amplitude Modulation rather than traditional Frequency Modulation.
This is because our goal from the start was Spectral Efficiency. Due to the fact that we are using AM,
we can pack 200 belt packs and 30 base stations in the same UHF footprint as One 4 drop FM system.
That makes us 30 times more spectrally efficient.