microHAM SMORF Manual page 10

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multiplier is indicated by flashing x100 indicator. Bottom power reading scale is shortened to half. Final value is
given by multiplying indicated value on the current scale by RANGE multiplier.
Current scale on TOP bar is indicated by one of SCALE indicators [3], and current RANGE is indicated by one of
RANGE indicators [5]. BOTTOM bar scale is indicated by its own SCALE [4] and RANGE indicator [5]. While
scale indicators for top and bottom bar are separate, range indicators are shared and differentiated by color.
TOP bar uses GREEN range indicator, BOTTOM bar RED indicator. When RANGE multiplier for both bars is the
same (rare but may happen), RANGE indicator is YELLOW.
Any selected power type for top and/or bottom bar graph is always shown in W [Watt] units. When bar shows
POWER, both bars can have independently defined four (4) power ranges, and for each power range one of
three (3) available colors can be assigned, for each band, each screen separately. These ranges and not related
to scale ranges described above, they may start and end anywhere from 0W up to maximal power. Advantage of
colored ranges is readability. When you set for example 50-100W range to be shown in red color, power from
50-100W will always be shown in red color, regardless of scale range (it doesn't matter if you are in 100W scale
or 2000W scale). In this way you can make some nicely visible important power areas like optimal driving power
for amplifier, maximal power to certain antenna etc ...
When bottom bar [2] shows SWR instead of reflected power, it is indicated by YELLOW SWR scale indicator [4].
SWR has its own, specialized scale divided to four (4) linear sub-scales in order to achieve fast, simple and
precise readout. SWR from 1.0 to 3.0 - the most important section - has linear division of 0.05 per bar segment.
It takes 80% of the bar length. SWR from 3.0 to 4.0 has division of 0.2 per segment, from 4.0 to 7.0 division 1 per
segment, while SWR 7 segment is lit when SWR is up to 10. Last but one shows SWR from 10 to 15, last one
everything higher than 15. Same as for the power, also for SWR four (4) custom color ranges can be defined in
the BOTTOM BAR MENU, on per band basis, settings follow the same segmented scale, but this time in a same
division and ranges as are defined SWR sub-scales.
When bars are configured to show parts of Complex Impedance, the two scales printed in between the two LED
bars are used. Scale above the central line applies to the top bar graph and shows Resistance R or Absolute
value of Impedance |Z| in 0 - 100Ω range. Scale below the central line applies to the bottom bar graph and
º
shows Reactance X or Phase angle Φ in -100 to +100Ω or -100 to +100 range.
Bar graphs can operate in MANUAL or AUTO RANGE mode. ROTARY KNOB [14] is used to select the mode
and to select range in MANUAL mode. When rotated in CW direction it changes range from the lowest (least
sensitive) to the highest respectively. When rotated in CCW direction, very last CCW position is AUTO RANGE.
In AUTO RANGE mode meter switches range upward immediately but down-ranges with timeout. BARS
DOWNRANGING timeout is adjustable in SYSTEM MENU | MISCELLANEOUS if you don't like the default
value.
When rotary knob is depressed and rotated, it changes ranges for bottom bar in a same manner as for top bar.
In MANUAL mode it is possible to overload current range. Overloaded range is indicated by fast flashing SCALE
indicator [3]. Each range allows 2% overload without overload indication. Since bar graphs are software driven,
there is no damage even if they are hugely overloaded for a long time, don't worry if it happens.
Last but one CCW range position of the rotary knob is percentage (%) range. When enabled, it is indicated by %
RANGE indicator [5]. This range is useful for instant checking if everything is as should be, because 100% power
level is always full deflection on linear scale without any range switching. 100% power levels can be precisely set
on per sensor, per band basis in SENSOR MENU according to your specific requirements or available power.
100% power level value is also used in TUNE SCREEN, optimized SCREEN for tuning manual Power Amplifiers
or Antenna Tuners.
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