AOR AR5000 Instruction Manual download pdf (Page 2)

double sided tape to hold the filter in an upside down position before making the soldered

connections.

Careful examination of the PCB around the filter

connections will show that there are two 33pF SMD

capacitors connected between the filter in/out and earth. Ideally these could be removed to

give a flatter frequency response along with changing R173 to 1k8. In practice however you

will probably not notice any change and we recommend that they are left as standard. The

circuit is shown below

After fitting the filter, refer to page 68 and 69 of the AR5000 instruction manual in order to

bandwidth that will be displayed when the filter is selected. Unfortunately there is no 1kHz

bandwidth available on the display.

AR5000 DETECTOR OUTPUT

The AR5000 is capable of running various decoders from its ACC1 socket on the front panel

(pin2 gives approx. 180mV RMS -100Kohm).

This is suitable in most cases, but is slightly limited by two 0.1uf capacitors and switching

circuits in line between the detector output and the socket.

If problems are experienced, then the solution will probably be direct connection to the FM

detector IC on the IF unit.

To do this, remove the top case of the receiver to reveal the IF and PLL units underneath. The

IF unit is the rearmost board (fitted with various filters). Once the six screws are undone and

the IF OUT mini-coax plug disconnected, the board will pull slightly forward and hinge

towards the front panel.

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AOR AR5000 Instruction Manual Page 2