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Page 43
CHAPTER FOUR
SECTION 4.3
COAX SWITCH HOUSING (continued)
ATTACH THE COAX JUMPERS & FEED LINE
COAX SWITCH
SO239 CONNECTOR
COAX
PURPOSE
JUMPER
LENGTH
IN
FEEDLINE FROM SHACK
NA
OUT 1
COAX JUMPER TO DIRECTOR EHU
8 FT
OUT 2
COAX JUMPER TO REFLECTOR EHU
11 FT 6 IN
OUT 3
COAX JUMPER TO DRIVEN EHU
4 FT
Figure 4.30
shows the coax switch housing with the appropriate coax connections. The table identifies the
orientation of the feedline and the three coax jumpers. Route the coax jumpers along the boom, being
careful to avoid placement on sharp edges. Secure with electrical tape.
Taping of the coax jumpers and control cable to the boom should be one of the last items done
before mounting the DB18 onto the mast. The coax jumpers will need to be disconnected dur-
ing the wiring testing covered in Chapter Five.
Figure 4.31
shows how the coax jumpers should be routed to each EHU. NOTE: The drawing shows the
coax jumpers as being below the boom—this is for illustration purposes only. The coax jumpers should be
taped against the antenna boom.
As a last step we recommend waterproofing the PL259 connectors using coax-seal. It is a good idea to first
put a layer of tape over the PL259’s and apply the coax-seal over the tape for ease of removal, should it
prove necessary. Do not do this step until the entire antenna has been tested and is ready to put up on the
tower.
OUTPUT 1: DIRECTOR; 8 FT
OUTPUT 2: REFLECTOR; 11FT 6 IN
INPUT: FEEDLINE
OUTPUT 3: DRIVEN; 4 FT
FIG. 4.30
FIG. 4.31