Instructions
:
Cubex - MARK II Series
Cubex Co., Inc.
06-03 Rev 9
Pg. 5
Note:
These terminals are not supplied when Cubex Matching Transformer is ordered with Antenna.
Matching Stub dimensions: Table I
Electrical Quarter wave 75 ohm coax ;
velocity factor = 0.67
BAND
CABLE TYPE
LENGTH (IN.)
LENGTH (CM)
10 Meters
RG11/U 75 ohm
69 in
(3/4 w-17’-3”)
175.25 cm
(5.2575m)
12 Meters
RG11/U
79-9 ½” in
(3/4w=19’-11”)
202.74 cm
(6.082m)
15 Meters
RG11/U
92 in.
(3/4w=23’-0”)
233.68 cm
(7.01m)
17 Meters
Note 3
20 Meters
RG 8/U 50 ohm
Any length
40 Meters
RG11/U
23.35 ft (420 in)
7.1171 m
Note 1- that any length 50 ohm coax maybe connected to the end of these matching stubs.
Note 2- Some experimentation may be required in adjusting each matching stub to optimize the
impedance transformation.
Note 3- 17 meters should not require any stub and match okay with 50 ohm cable.
Note - Cables supplied by Cubex may vary in length (longer) from above as we use a special
RG-11 coaxial cable with a VF of 0.72
L
Dimensions above
Figure I