AOR ARD300, Руководство пользователя, Страница: 12 / 28

How to enable 10.7MHz IF output in all modes
Level of difficulty: Intermediate (soldering required)
Only apply the following hardware modification if you have some experience in
soldering on a PCB. Proceed at your own risk! AOR should not be held responsible for
any receiver damage. If you don’t feel confident, it is strongly advised to get help from a
qualified technician.
By factory default, the WFM heterodyne is used to generate a 10.7MHz IF output. IF
output is enabled in WFM mode only, but to use the IF output in all modes, a zero Ohm
link needs to be moved inside the radio, this requires the use of a soldering iron. This
arrangement is designed to minimize the potential for internally generated spurii when
the 10.7MHz IF output is not going to be used.
To enable the output on all modes, simply remove resistor R218 (0 Ohm jumper) and fit
R219 (0 Ohm jumper). These resistor positions are located on the large main receive
board on the underside of the set.
To gain access, remove the top and bottom covers.
Then remove the top and bottom chassis covers (three screws down each edge of both
covers and three black threaded screws through the board. Don’t forget to unplug the
speaker wire (it plugs in J7, the other socket is for the optional battery).
With the set upside down and the front panel facing you R218 and 219 are located in
the front left hand corner about 13mm back from the left hand 9 wire connector and
15mm in from the side.
The components are too small to illustrate in the diagram below but it gives a general
idea of where to look. R218 is marked as 000 and is fitted to the board. R219 is located
alongside R218 (two solder pads are visible and it is not fitted). Both are located directly
behind a small feed through hole in the board.
9