Copyright Palomar Engineers®, Inc., 1965-2019
Palomar-Engineers.com
The PAL-OCF1606 is rated for 1500 watts PEP at 30% duty cycle for RTTY, AM, or other continuous modes.
The PAL-OCF1606HP and PAL-OCF1606EHP are rated for 3KW and 5KW PEP respectively.
To adjust the antenna for minimum SWR on 20 meters (rather than 40 meters), adjust the 40/20 stub by
removing 6 feet of length or fold back 6 feet of length on itself to fine tune. For best 40 meter SWR, the stub
length is approximately 19 feet, and for 20 meter minimum SWR, the stub length is approximately 13 feet.
These dimensions will vary depending on ground conductivity, height above ground, proximity to adjacent
objects. Use your SWR meter at the end of the coax to determine the best stub length for 40 or 20 meters.
Typical SWR curves through 200 feet of RG-213 and 35 foot average height (Your curves may
be different depending on terrains, ground conditions and surrounding object/antennas):
Note: Second stub (under the longest part of OCF) has the effect of shortening the overall antenna length to 234
feet. If you do not want the second stub, then make the antenna 260 feet long with legs of 79% and 21% of the
total length.
CAUTION
USE CAUTION WHEN INSTALLING ANTENNA AND KEEP AWAY FROM ANY POWER LINE
WIRES!
Check website for latest product announcements.
