Zaxcom MicPlexer2 Operations
6
Using the Variable inputs
The MicPlexer2 has two user adjustable settings V1 and V2. The variable positions allow you to
custom set the center of the 35MHz filter to any frequency desired. This will allow the MicPlexer2
to be customized for any frequency range. This will also allow the MicPlexer2 to cross blocks.
Setting the variable filter
To set the variable filter you will need a small screwdriver and a transmitter.
1.
Set the rotary dial to the desired variable position (V1 or V2).
2.
Turn the transmitter on and set it to its lowest output power setting then tune the
transmitter to the desired frequency you will be operating it at.
3.
Place the transmitter about 3 to 3 feet (.5 to 1 meter) away from the MicPlexer2.
4.
Adjust the appropriate potentiometer (V1 or V2) till you see the first position LED just barely
illuminate. Turning the pot to right increases the frequency and turning to the left lowers the
frequency.
Now the center of the 35 MHz filter for that variable position is set to the frequency of that
transmitter, and the useable frequencies for that variable position are 17.5 MHz above and 17.5
MHz below that frequency.
Overload LEDs
The MicPlexer2 has three overload LEDs for each antenna input. The purpose of these LEDs are to
determine if the MicPlexer2 is receiving too strong of an RF signal. If a strong signal, either from
your transmitters or some other RF source, is received the RF amp in the MicPlexer2 can
overload. If the amp overloads it can desensitize the unit and can cause possible intermodulation
interference which will decrease performance.
In most situations there should be no illumination of any of the LEDs.
If the left most LED is lit,
this should be a warning and you should try to move away from the RF source to get the LED to
go out. If the center LED starts to illuminate you may be overloading the MicPlexer2 so you will
want to reduce the incoming RF. If the right OL (overload) LED comes on you are overloading the
MicPlexer2 and you will need to minimize the RF by moving the antennas away from the RF
source or you may even need change the frequency block.
LED RF indication levels
•
Left LED will illuminate when the RF noise floor is at -24dB
•
Center LED will illuminate when the RF noise floor is at -18dB
•
Right (Overload) LED will illuminate when the RF noise floor is at -14dB
.
