PROCASTER AMTX100 AM Transmitter
Installation and Operation
Page 3 of 9
Direct wall mounting with standoff brackets
Use Radio Shack 4 inch Antenna Mast Wall Mount kit catalog # 15-883 to hold the
PROCASTER™ further away from the wall.
(direct on wall with brackets)
Pole mounting
For pole mounting use a pair of 2 inch spacing U-bolts with formed curved backing plates – like
the ones in the following picture. The backing plate prevents the case mounting areas from
bending when tightening onto the pole and makes for a more secure installation.
(pole mounting)
Step 5. Install Ground
Connect the copper grounding lug shown below to a suitable ground.
(grounding lug)
Good grounding is extremely important for optimum antenna performance and is required for safe
operation of the lightning protection circuitry. Typical grounds include:
•
Copper clad steel grounding rod at least 8 ft into earth ground
•
Water pipe ground
•
Radial ground system
•
Metal roof
Warning: FCC rules (47 part 15.219) state:” the total length of the transmission line, antenna and
ground lead (if used) shall not exceed 3 meters.” [3 meters = 118 inches]
The PROCASTER™ has an attached 103 inch antenna measured from its tip to the lower
mounting bolt which is the connection of the transmitter output. It has no transmission line. A 15
inch maximum ground lead is allowed from the grounding lug to a massive ground.
Step 6. Connect Power and Audio Wiring
The PROCASTER™ connects to the studio interface with 4 conductor CAT3 wire. Because the
audio is balanced and the power consumption is low, several hundred feet of wire can be used
without issue. Proceed as follows:
•
Open the PROCASTER™ cover by loosening the 3 cover clamps
•
Insert 4 conductor CAT3 wire through liquid-tight grommet on the underside
•
Connect:
o
RED: +12V
o
GREEN:
0V
o
YELLOW: AUD +
