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OUTPUT OF THE OPERATIONAL AMPLIFIER FEEDS BACK TO THE SERIES RC
NETWORK.  THE OTHER OPERATIONAL AMPLIFIER INPUT IS FED BY A
RESISTIVE DIVIDER, ONE END OF WHICH IS CONNECTED TO A 2N7000
TRANSISTOR.  TWO INTEGRATED CIRCUITS, EACH CONTAINING TWO
OPERATIONAL AMPLIFIERS, ARE USED.  ONE OPERATIONAL AMPLIFIER ACCEPTS
THE 9 V INPUT AND PROVIDES A 4R5 V SUPPLY NEEDED FOR THE CIRCUITS.
THE OTHER OPERATIONAL AMPLIFIER FUNCTIONS AS THE TWO OSCILLATORS.
THE OUTPUT OF EACH OSCILLA OPERATION ON THE RADIO, ITS POSSIBLE TO
CHOOSE DIFFERENT OPERATING MODES.  THIS CAN BE DONE DIRECTLY BY THE
TOUCHSCREEN OR BY GOING THROUGH THE MMDVMHOST CONFIGURATION PAGE.
IN ADDITION TO THE SUPPORTED MODES INDICATED AT THE BEGINNING OF THE
ARTICLE, ITS ALSO POSSIBLE TO OPERATE IN P25 AND NXDN.  IT OFFERS
CONVERSION BETWEEN DIFFERENT PROTOCOLS SUCH AS YSF2DMR, YSF2NXDN,
YSF2P25, DMR2YSF, AND DMR2NXDN.  WHEN TWO MODES ARE ACTIVATED AND
THEY ARE IDLE, THE RADIO AUTOMATICALLY ENTERS SCAN MODE BETWEEN
THESE TWO MODES UNTIL A COMMUNICATION IS RECEIVED ON ONE OF THEM.
THEN, IT WILL REMAIN IN THIS MODE ACCORDING TO THE PROGRAMED
HANGTIME IN THE CONFIGURATION.  BY DEFAULT, THE HANGTIME IS 20
SECONDS, BUT ITS POSSIBLE TO CHANGE IT FOR EACH MODE ACCORDING TO
THE OPERATORS PREFERENCE, AS SHOWN IN FIGURE 8.  TO CHANGE BETWEEN
MODES, THE CONNECTED TALKGROUPS TG OR REFLECTOR, JUST PRESS MODE ON
THE SCREEN TO SWITCH BETWEEN THE ACTIVATED MODES.  IN MY CASE, I USE
DMR AND D STAR MOST OF THE TIME.  EACH OF THEM IS CONNECTED TO A
SPECIFIC NETWORK, THE DMR IS CONNECTED TO A TG ON THE BRANDMEISTER
NETWORK WHILE THE D STAR IS CONNECTED TO A DCS REFLECTOR.  THUS, THE
RADIO MONITOR BOTH MODES AND SWITCHES BETWEEN THE TWO IF A SIGNAL IS
RECEIVED.  THE RADIO SPEAKER CHANGES COLOR DEPENDING ON THE STATUS
OF THE RADIO, IF THE RADIO IS IN THE IDLE STATE, THE SPEAKER IS
BLUE, AND IT WILL TURN GREEN WHEN A COMMUNICATION IS RECEIVED, THE
DISPLAY WILL ALSO SHOW THE CALL SIGN OF THE RECEIVED STATION.  THE
SPEAKER WILL TURN RED WHEN THE PTT IS PRESSED ON THE MICROPHONE, AND
THE DISPLAY WILL SHOW YOUR CALL SIGN.  THE MAIN MENU PROVIDES ACCESS
TO SYSTEM SETTINGS THAT ALLOW YOU TO ADJUST THE BRIGHTNESS OF THE
SCREEN, AS WELL AS ADD A ROGER BEEP AFTER RECEIVING AND TRANSMITTING
A COMMUNICATION.  FORTUNATELY, THIS ROGER BEEP FUNCTION REMAINS
LOCAL TO THE RADIO SPEAKER AND IS NOT TRANSMITTED OVER THE AIR.
THIS CAN BE HANDY WHEN WANTING TO INTRUDE INTO A CONVERSATION, AS IT
PINPOINTS THE EXACT MOMENT WHEN THE REMOTE OPERATOR RELEASED THE
PTT.  IT IS ALSO POSSIBLE TO INCREASE THE SOUND LEVEL OF THE
MICROPHONE WITH THE BOOST FUNCTION, WHICH CAN BE ACTIVATED
INDEPENDENTLY FOR EACH MODE, SOMETIMES HIGHER GAIN IS NECESSARY
BETWEEN DIFFERENT MODES AND REFLECTORS.  FINALLY, SINCE VERSION
1R31, ITS POSSIBLE TO USE A MEMORY MENU, THIS ALLOWS YOU TO STORE
YOUR PREFERRED TG AND REFLECTORS TO RECALL THEM QUICKLY.  THE USER
MANUAL INCLUDES 32 PAGES THAT DESCRIBE VERY WELL ALL THE PARAMETERS
AND POSSIBLE OPERATIONS ON THE RADIO.  THE DOCUMENTATION ALSO
DESCRIBES HOW
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