Funk Amateur BX-7300, User Manual

©  www.funkamateur.de

Automatic Antenna Selector

Mounting

8

BX-7300 • 180403

Picture 9. Site of test point M and +5V.

Picture 10. Correct build positioning of IC 2; the site of the in-
dentation (arrowed) is to be paid attention to.

Picture 12. With IC 5 the marker point must be nearest the edge
of the board.

Picture 13.  Position of IC 6 after mounting.

Picture 11. Optical coupling device IC4 soldered in position.

Testing the DC supply

Using the kits accompanying hollow round plug and a twin
core cable, the DC supply should be assembled. The sup-
plied fuse should be placed in its holder and the bench
power supply set to 12V with a current threshold of 0.2A.
The voltage output from the bench supply is now connected
via the DC supply cable to socket 7. With the multimeter at
the +5V test point (picture 9) there should be a reading of
between 4.9V and 5.0V. If not, then it’s the old task of find-
ing out why and correcting the problem before mounting
any more components. As a reference point for calibration
for example, the test point M, near to the fuse, may be used.
When everything is in order the DC supply and board may
be disconnected.