Vectronics HFT-1500 - Manual (Page 9)

HFT-1500 Digital Antenna Tuner with Roller Inductor Owner's Manual
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controls for a minimum REFLECTED reading while maintaining a FORWARD
reading of 50-100 watts using your transmitter power control.
9. Read the SWR on the red scale at the point where the two needles intersect. Repeat
step 8 until the lowest SWR reading is obtained. The SWR should be 2:1 or lower.
Note: This procedure takes patience the first time. The TRANSMITTER and
ANTENNA controls vary the capacitors and provide fine adjustments. The
INDUCTOR control provides coarse adjustment.
10. When you have tuned your antenna to the best SWR, record the settings of the
TRANSMITTER, ANTENNA, and INDUCTANCE controls on the previous chart for
future reference. When you retune, use these settings as your starting point.
USING THE BARGRAPH
1. Plug in the AC adapter provided with your tuner into jack located on the back panel.
2. In the Tuning Section after completing the tune-up sequence, key your transmitter
through the tuner into the dummy load (e.g. DL-650; DL-500). Adjust for a meter
reading of 100 Watts Forward (at this time the SWR will have been adjusted for
minimum value as outlined in the Tuning Section).
3. Rotating the LEVEL control activates the bargraph and the segments will illuminate
progressively as the LEVEL control is increased. If your cross-needle meter is
reading 100 Watts as indicated in (2) rotate LEVEL control so that the last LED (red)
illuminates. This signifies that the 100 Watt average single tone reading on the
cross-needle meter display is identical to the power reading of 100 Watts single
tone on the digital display. Without any further adjustment of the LEVEL control,
switch your transmitter to SSB and speak normally into the microphone and you will
notice that the cross-needle meter will read approximately 30-40 Watts and the digital
display will show an output of 100 Watts PEP when red LED ignites while you are
speaking. This will confirm that the cross-needle meter reads 30-40 Watts average
assuming you started with the 100 Watts single-tone as described above and the
digital display will read voice peaks of 100 Watts (100 Watts PEP).
Note: All cross-needle meters read average power when you are using the transmitter
in the SSB mode. Some cross-needle meter displays are capable of peak-
reading but will read 20% low because of directional coupler driver
impedance problems.
4. Once satisfied you are getting the right results in (3), while you are speaking into the
microphone with the DELAY control fully counter-clockwise, the forward peak
indication on the meter will be as quick in response as the delay. If this is not a
desirable condition, rotate the DELAY control counter-clockwise until the desired
amount of DELAY is introduced in the display. The forward fast attack time is not
affected by the DELAY control.