User's Manual

SIGNAL

The SIGNAL key is used to select signal measurement and display options. Its standard menu is:

1)Power Graph 2)Interval

3)Boundaries

1) Power Graph

Selecting this option will make the receiver display a bar graph and a dimensionless relative

signal strength number between 0 and 255 upon reception of an impulse signal. The signal

strength value is not compensated by the RF gain setting, therefore a change in RF gain will

cause a change in signal strength reading. The power graph display provides you with a visual

representation of signal strength that simplifies relative measurements. The display looks similar

to the following:

149.450MHz +102

min❚❚❚❚❚❚❚❚❘ ❘

While in this mode, the arrow keys can be used to increment and decrement gain and frequency

as discussed earlier. The gain appears in the display only when it is adjusted. ESC is used to

return to the SIGNAL menu

2) Interval

This option filters the received pulses using a pulse interval window. A pulse is considered valid

if the time elapsed since the last received pulse is within the time interval defined by window

(see boundaries below). Valid pulses will trigger a dynamic "strobe" character in the lower right

quadrant of the display. The interval display looks like the following:

151.445MHz

943ms 214 G

The receiver does not exercise any automatic control of receiver gain. In a noisy environment

(e.g., in an aircraft or in the vicinity of computer equipment) it is possible to set the gain high

enough so that the receiver is saturated with noise and cannot detect even a reasonably strong

signal. Simply reducing the gain will normally correct this situation. (See also Optimization).

In this mode, the arrow keys can be used to increment and decrement the gain, frequency and

window size as discussed earlier. The gain and window only appear when they are being

adjusted. ESC is used to return to the SIGNAL menu.

3) Boundaries

This option allows you to specify a time window in milliseconds for valid pulses. The following

prompt appears:

Time interval upperbound

(04950)>