User's Manual

Enter the frequencies you wish as six digit numbers, or five digit numbers if you have a 30 or

50MHz receiver. The decimal point is supplied by the program but nothing bad happens if you

enter your own. You may keep entering frequencies one after another; when you have entered

all the frequencies you want, press ESC. This takes you back to the F TABLE menu. You can now

select another table to enter other frequencies, review the frequencies you have just entered

(using the delete option), or press

ESC

to leave the menu of F TABLE. If you run into trouble, press the ESC key repeatedly until you are

back to the main menu (frequency and gain display), and then start over.

When you have created your frequency tables you will set the scan (or dwell) time. This is the

amount of time the receiver will stay at each frequency in the scan table before proceeding to the

next frequency. You can choose this time in a hundredth of a second intervals over a range of 1

second to 10 minutes.

PROCEDURE: SETTING SCAN TIME

From the command environment, press

SHIFT

SET

SCAN

The screen will prompt you to enter a 5 digit number (minutes:seconds. hundredths); the colon

and decimal point are automatically supplied. Normally you will select a scan time that is (at

least 100 msec.) longer than the longest pulse interval of your transmitters to ensure that no

signals are missed. For example,

• Enter 0:10.50 for 10.5 seconds

• Enter 1:23.00 for 1 minute, 23 seconds, etc.

NOTE: All digits must be entered. After the last digit is entered, the receiver will automatically

return to the command environment display (frequency and gain) with the addition of scan time

in the lower left quadrant. The arrow keys will now adjust the scan time using the time

increment selected by the SET

∆ function.

Since you will be flying, you will be concerned about the levels of noise generated by the aircraft

engine and how this will affect your receiver sensitivity. Your first flight is in fact dedicated to

setting up your antennas and establishing a "noise floor", using one or more reference

transmitters in a known location on the ground. While flying, you will use the SIGNAL/Interval

routine to assess the level of noise.

PROCEDURE: NOISE AND SIGNAL MEASUREMENTS