QB-12 BALUN - Palomar Engineers

Model CB-9-1500 Dual Core, Balanced Voltage Balun
50:450 Ohm, 1.8-31 Mhz, 1KW PEP
Purpose. This balun is designed to convert 450 ohms balanced to 50 ohms
unbalanced at 1500 watts power at 100% duty cycle from 1.8-31 MHz. It
provides conversion from unbalanced coax to a balanced 450 ohm ladder
line/antenna feed point and gives a 9:1 impedance step-up to reduce VSWR on
the coax feed line. The balun is housed in a 4” x 4” “2 NEMA weather resistant
Copyright Palomar Engineers, Inc, 1965-2013
www.Palomar-Engineers.com
box with SO-239 coaxial input and ¼” stud terminals opposite the input
connector.
This balun is DC grounded and will bleed off static electricity but it is NOT A
LIGHTENING ARRESTOR.
Model CB-9-1000 is a 50 ohm to 450 ohm (9:1) current balun used to translate a
50 ohm input up to 450 ohms at RF power levels up to 1000 watts PEP (50%
duty cycle) when used with a matched load. With a matched 450 ohm balanced
load SWR should not exceed 1:5 over the frequency range 1.8-31 MHz. (see
figure below)
Application. For balanced Zepp type antennas fed with 450 ohm line, the 9:1
balun makes a good transformer for converting to 50 ohm coax to the 450 ohm
feed point. If you use the antenna on multiple bands, the feed point impedance
may not always be 450 ohms and use of the balun at high (>600 ohms) or low
(<300) will require reduced power input or the balun/unun may have its power
ratings exceeded and damage to the balun may occur. The (9:1 conversion ratio
will change for loads other than 450 ohms balanced.
Typical frequency response (1.8-31 Mhz) and impedance transformation with 450
ohm balanced load is:
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Copyright Palomar Engineers, Inc, 1965-2013
www.Palomar-Engineers.com
Palomar Engineers stocks ferrite beads and cores for radio communication
and radio frequency interference (RFI) suppression. We also carry coaxial
common mode chokes, Sleeve baluns, CUBE Baluns™, line isolators, and
voltage & current balun/unun kits in ratios 1:1, 4:1, and 9:1 used for
antenna matching and radio station noise floor reduction.
Ferrite Toroid Cores
RFI Suppression Kits
SNAP ON Ferrite Beads
Balun/Unun Kits 1:1 4:1
9:1
SLIP ON Ferrite Beads
CUBE Baluns™
Kurt Sterba Products
Super Choker™
Sleeve Baluns
Phone: 760-747-3343 Fax: 760-941-4676
www.Palomar-Engineers.com
Email: [email protected]
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