Vectronics VEC-1862 - Manual (Page 8)

VEC-1862 Instruction Manual Six-meter Yagi Antenna
8
feedline and hairpin assembly may remain attached. If you remove the U-bolt assembly,
elements may be stored inside the boom.
TUNING THE VEC-1862 FOR FM SUB-BAND OPERATION
The VEC-1862 is easily retuned for operation in the FM portion of the six-meter band.
To do this, simply re-cut the element sections as shown below using a hacksaw or tubing
cutter. Be careful not to cut the threaded ends when shortening elements!
[ ] Reflector sections, cut for 56-3/4" each.
[ ] Driven element sections, cut for 52-3/8" each.
[ ] Director sections, cut for 51-3/4" each.
This will provide minimum VSWR near the 52.525-MHz FM-simplex calling frequency,
and should provide low VSWR on most 6-Meter FM-repeater input frequencies.
IN CASE OF DIFFICULTY
If you experience difficulty with your VEC-1862, please check out the following
possibilities before contacting the factory:
High VSWR or Intermittent operation:
Inspect all connectors for a broken lead, water, ice, severe corrosion, or dirt.
Inspect coax for kinks, chaffing, crushed areas, breaks in jacket, water infusion, etc.
Inspect the antenna for loose or broken elements, broken coax pigtail, or debris.
Check in-line devices such as amplifiers, coax switches, VSWR meters, etc.
Check balun sleeves for damage from excessive RF heating.
No Sensitivity, Poor directivity:
Improper phasing (stacked beams only).
Extreme build up of ice and snow.
IMPORTANT NOTE: Rain, snow, or ice accumulating on antenna elements normally
increases VSWR by lowering the antenna's resonant frequency.
Precipitation detuning is normal for all VHF Yagis, and the
VEC-1862 is cut approximately 200 kHz high in frequency to
help compensate for this effect in wet weather.