Icom IC-R2 / IC-R5
The Icom IC-R2 and IC-R5 are broadband receivers that have a similar enclosure. From the inside as well, there are many similarities between the two receivers. The IC-R2 and IC-R5 have a TA31136 FM IC. The baseband audio can be found on measurement point 'QUAD', that can be reached easily.
Measurement point 'QUAD' in the Icom R2
Measurement point 'QUAD' in the Icom R5
A 10 k miniature resistor (1/8 W) is soldered to 'QUAD'. The resistor's other lead is connected to the inner conductor of a short piece of shielded wire.The shield can be connected to the metal housing of coil L21.
The 10 k resistor soldered to 'QUAD'
There is not much space for an additional chassis socket. That's why I used a 'pigtail': the shielded wire is led to the outside of the scanner and has been equipped with a female 3.5 mm connector.
A cable tie on the inside of the scanner is used as a strain relief.
The 'pigtail' from the IC-R2