Instructions: Cubex SkyMaster Series
Cubex Co., Inc. 05-06 Rev 0
Pg. 8
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 = 0.66
BAND CABLE TYPE LENGTH (IN.) LENGTH (CM)
10 Meters RG11/U 75 ohm 68 in 172.72 cm
12 Meters RG11/U 79 3/4 in 202.74 cm
15 Meters RG11/U 92 in. 233.68 cm
17 Meters Note 3
20 Meters RG 8/U 50 ohm Any length
40 Meters RG11/U 23.35 ft (420 in) 711.71 cm
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.
For ¾ wave lengths multiply the lengths above by a factor of 3, excess cable may be
coiled into a 6 inch dia. Coil and taped together.
L
Dimensions above
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