-9-
CHECKOUT AND ADJUSTMENT
4. Check VSWR on 20 meters. Tuning is quite broad on this band because the
antenna is physically much taller than a quarter wavelength. To raise the
frequency of the lowest VSWR, reposition the 30 meter assembly so that the
coil support tube 30 meter L bracket (O1) can be replaced on the next lower
turn of the 40 meter coil. Alternatively, to lower the frequency of lowest
SWR, reconnect the coil support tube 30 meter L bracket (O1) to the next
higher turn of the 40 meter coil. In some cases moving the tap point a full turn
up or down may cause more of a frequency shift than is desired, in which
case the entire 30 meter assembly may be rotated around tube (E) to permit
adjustments of less than one full turn.
5. Check VSWR on 15 meters. The VSWR curve may be shifted upward or
downward by changing the length of the stranded wire between wire clamp
0.500" 15 M w/wire (L) and wire clamp 0.875" 15 M w/insulator (K). To raise
the frequency, simply shorten the wire by wrapping a longer
tail
back on itself
and sliding the lower clamp upward to maintain tension. To lower frequency,
feed more of the
tail
back through the hole in the insulator to increase the
length of the wire between wire clamp 0.500" 15 M w/wire (L) and wire
clamp 0.875" 15 M w/insulator (K). A change of 2 in (5.1 cm.) will shift the
VSWR curve approximately 300 kHz.
6. Check VSWR on 10 meters. To raise the resonant frequency loosen the small
hose clamp over the slotted end of tube (I) and slide tube (J) farther into tube
(I); to lower the frequency, slide tube (J) farther out of tube (I) and retighten
the hose clamp. A length change of 3 in (7.6 cm) should move the VSWR
curve approximately 200 kHz.
7. Check VSWR on 30 meters. To raise frequency, loosen the wing nut on the
bottom coil clamp of coil/capacitor assembly 30 meter (P), stretch the coil and
retighten the wing nut. To lower frequency, compress the coil. A change of
only 1/4 in (6.4 mm) will shift the VSWR curve approximately 100 kHz. Large
changes in the setting of coil/capacitor assembly 30 meter (P) may affect 20
and 40 meter tuning, in which case it may be necessary to repeat steps 3 and
4. In general, the point at which the 30 meter coil taps on to the 40 meter coil
will be the major factor in 20 meter tuning.
8. Check VSWR on 17 meters. To move the SWR curve to a higher frequency
loosen the wing nut on the upper coil clamp and STRETCH the coil about 1/4 in
(6.4 mm) at a time. To move the SWR curve to a lower frequency range
COMPRESS the coil a like amount.
9. Check VSWR on 12 meters. Stretch the 12 meter coil in increments of 1/4 in
(6.4 mm) or so to raise the resonant frequency, or compress the coil a like
amount to lower the resonant frequency.
Summary of Contents for HF9V
Page 14: ...14 Feedline Detail PICTORIAL...
