Advanced Microwave Products LLC VT15SC User Manual

VT15/OM Rev-A 

 

8

 
POWER CONNECTOR (MDM-9P) 
 

Red Wire – Positive DC Input 

 

Black Wire – Negative DC Input 

 

White Wire – On/Off Control 

AUDIO CONNECTOR (MDM-9S) 

Red Wire – Mic Supply Output 
Yellow Wire – Audio 1 Input 

(Mic or Line) 

Violet Wire – Audio 2 Input 

 

Black Wire(s) – Ground 

(1 per subcarrier) 

VIDEO CONNECTOR (SSMA) 

SMB Connector Optional 
Mate: Supplied Video Adapter Cable 

Standard 75 Ohm Video Input 

 
Accepts Standard 1 Vpk-pk Video Signal 

RF OUTPUT CONNECTOR (SMA) 

 
Mate: Appropriately Selected SMA Antenna

Standard 50 Ohm RF Output 

 
Outputs Nominal RF Power Level to Antenna 

 
4.2  

Use and Function of Switches 

 
4.2.1  Frequency Selection Switches: 
Frequency selectability is an option on all VT15 Series Transmitters providing RF 
frequency control with slide switches accessible through the chassis lid.  S-Band units 
utilize 8 slide switches; UHF, L-Band, and C-Band units utilize 12 slide switches.  Each 
switch is uniquely identified (FS1 through FS8, or FS1 through FS12) on the unit label. 
 
To program the desired RF frequency, position the individual switches as shown in the 
applicable Frequency Selection Chart, included with product shipment and available as a 
download on the applicable Video Product Page of our website 
(www.advmw.com/video). 
 
4.2.2  Dual Power Switch: 
VT15 Series Transmitters may be ordered with nominal RF output power of 250 mW, 
500 mW, 1 Watt, or 2 Watts and may be optionally configured for dual power operation 
utilizing any two power levels.  RF output power level is controlled with a slide switch 
accessible through the chassis lid.  Switch is inactive if this option is not purchased. 
 
To select the higher RF output power level, position the slide switch to HIGH PWR as 
indicated on the unit label.  To select the lower RF output power level, position the slide 
switch to LOW PWR as indicated on the unit label. 
 
L and S-band VT15 Series Transmitters operating at 2 Watts incorporate an automatic 
power “fold back” circuit to protect the unit in case of high VSWR loads (such as RF 
short, RF open, broken antenna, wrong antenna, etc.).  In the event of a high VSWR load 
causing greater than 1 Watt power reflection, the RF output power is automatically 
reduced to below 1 Watt to avoid excessive heat and potential damage to the unit.  The 
“fold back” circuit attempts to restore the RF output power to its normal level every 1 
millisecond, checking each time whether the high VSWR load has been repaired.