19
Section 1-7
1-7 IF output and Spectrum Display Unit (SDU5500)
The rear panel has a 10.7MHz i.f. output designed to drive the SDU5500 optional Spectrum Display Unit.
The AR8600 must be enabled in order to provide the i.f. output, this operation should be carried out in a
workshop. The WFM circuit of the AR8600 becomes permanently active to achieve a wide bandwidth
(irrespective of receive mode employed), however the usable bandwidth remains smaller than the total
10MHz provided by the SDU5500. The i.f. output varies depending upon receive frequency and receive
mode.
The SDU5500 provides an excellent tool
for locating elusive transmission with a PEAK
capability to ‘freeze’ the briefest of transmissions
for later measurement of frequency and level after
the event. A free supporting PC software
package provides a virtual on-screen display of
the SDU5500 with AVI video recording to disk so
that events may be replaced at varying speeds for
historic analysis.
The firmware of the SDU5500 is FLASH upgradable. It may be necessary to upgrade the SDU5500
firmware to support for the AR8600, other models and new features may be added to the SDU5500
in the same manner. Details are published on the AOR web site including the HEX data and full
instructions (plus computer control), no workshop equipment is required for firmware update and you
do not need to remove the case of the SDU5500, all data is sent via the RS232 connection via a
terminal program.
To Next Page
Loading...
