AOR SDU-5000, Руководство по эксплуатации

Страница: 29 / 29

Of course you can work the formulae backwards too! If you require a 5kHz step:
5 x 16 x 10 = 800 kHz - you may note a quick way: simply divide or multiply by 160
(the total number of increments)
The following relative table may be of assistance:
Each marker movement Bandwidth (span)
1 kHz 160 kHz
5 kHz 800 kHz
6.26 kHz 1000 kHz
9 kHz 1440 kHz
10 kHz 1600 kHz
12.5 kHz 2000 kHz
20 kHz 3200 kHz
25 kHz 4000 kHz
50 kHz 8000 kHz
62.5 kHz (maximum span) 10000 kHz
8. Due to the AGC effect of the host receiver, the peak trace may reduce as it is tuned toward the centre
of the display. As a result measurements may be more accurate when measured away from the
centre frequency. The level of change may be in the order of 10 - 15 dB but will depend on AGC action
(the larger the signal then the greater the change).
To help with this, the modified AR3000A/3000 is fitted with an SDU AGC/mute switch. For best
accuracy, switch the AGC "off" when taking measurements on the centre frequency.
ICOM ICR8500
Set the R8500 up as an ICR7100 by accessing the ICOM initial set mode as per page 30 of the ICOM operat-
ing manual. Set the baud rate to 9600 and address to 34h. The supplied RS232 is ready to go without
modification.
Remember, although not a low cost product the SDU5000 is a
fraction of the price of a dedicated spectrum analyser.