TelePost LP-100A, Руководство по эксплуатации

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10
Detailed Operation
Cont’d
Peak/Avg/Tune
This button toggles between a pseudo-average numerical display, a peak-hold display and a tune mode. In all cases, the bar graphs
remain in fast mode. The character after the numerical power readout indicates which mode you are in. A “W” indicates peak mode, a
“w” indicates average mode and a “T” indicates tune mode. Average mode is best for taking accurate measurements with steady state
signals, or for tuning an antenna tuner. Peak is best for CW or SSB operating. Note: The Peak Mode is VERY fast, and can respond to
a lip smack, mic button click
, etc. Don’t be alarmed by this… it is normal, and allows the LP-100A to provide an accurate indication of
peak power. Unless a lot of compression is used, the peak reading will usually be somewhat higher than the indication with a
carrier…
as much as 30% depending on the ALC attack time in your rig, and power supply regulation of rig and amplifier. Tune mode is similar to
Peak mode, except that the peak hold time constant is set to 0.25 sec as opposed to the hold time set in Setup. The Average and Tune
modes use the preset bargraph range in the setup section, while the Peak mode shows a fixed 13 dB range. The Tune mode is
designed mainly for tuning an amplifier using a pulser.
The button also allows selection of couplers if the Dual Coupler Option is installed.
Holding the button for a second will display and advance the coupler choice.
Choices are “Channel 1”, Channel 2”, “AutoSense”. Press/hold once for each
change. A small arrow next to the SWR title indicates which coupler is active. A down arrow indicates CH1, and up arrow CH2.
Setup
The Setup/Calibration modes can be accessed with the Mode button. To enter Setup mode, press and hold Mode button for about 1
second.
Once in Setup mode, the Mode button is used to cycle through the setup screens. If you hold the button too long, you will
advance to the Calibrate mode. Simply hold the button again to return to the main screen and start over.
Reference. This screen display the reference voltage from the gain/phase detector, the RSSI output from the counter AGC amplifier
and temperature in degrees F & C. It is only mainly for diagnostics. Pressing the Alarm button in this mode resets the PIC, quite useful
when flash programming the PIC. The reset does not affect setup/calibration settings. Pressing the Peak/Avg/Tune button toggles the
Temp display between degrees C and F.
User Alarm Setting . Allows setting a user threshold other than the preset choices. Any setting from 1.0 to 5.0 is permissible.
AL Thresh/Pwr Mode. Allows selection of a power threshold for the SWR alarm. The normal setting is zero, meaning that the alarm will
work at any power level. Choices are 0, 0.1, 1.0, 10.0, 100.0W. This is useful for multi-transmitter contest setups where significant
energy from a nearby antenna might be present on the output of the LP-100A coupler. If the energy is from another band, the LP-100A
will display SWR, which will be high. By setting a power threshold for the alarm, it will keep the alarm from tripping on induced power.
The Pwr Mode allows selection of
Net or Fwd power. Net is Fwd minus Ref… or delivered power. F+R is the total incident power
(including Ref) as displayed on typical wattmeters like a Bird 43.
Range. Sets the maximum excursion of the bargraph for the three automatically selected ranges. T
he choices are…
Low
– 5, 10, 15, 20, 25W
Mid
– 50, 75, 100, 125, 150, 175, 200, 225, 250W
High
– 500, 750, 1000, 1250, 1500, 1750, 2000, 2250, 2500, 3000W
Defaults are 15W, 100W and 1500W.
Each range allows 10% overhead, so that the 100W selection would extend to 110W, for example.
Note: These settings do not affect
the numerical readout, which has no limits of any kind.
The Dn button selects the range, and the Up button sets the power level, with wraparound to the beginning values.
Bargraph Tuning Range . Sets the width of the bargraph in Average and Tune modes from 3dB to 12dB. This allows tailoring of the
bargraph resolution for amplifier tuning to simulate an analog meter. The response is still logarithmic to minimize jitter, and be more like
the typical square law analog meter response. The default is 12dB. You can use a narrower range to increase bargraph resolution for
amplifier tuning. The default setting of 12dB gives almost 1% bargraph resolution, and the other choices give much better than 1%
resolution.
Averaging Samples . Sets the number of samples for power averaging, adjustable from 2 to 24 samples. Default is 8 samples.
Peak Hold Time . Sets the hold time in Peak mode. Adjustable from 0.25 to 5 seconds. The default setting is 2 seconds for normal SSB
or CW operation.