TM 11-6625-1559-12
(3) Perform the procedure in paragraph 3-
6d through 1, to obtain the best display on the
procedure for using external markers.
3-7. Measuring Bandpass of RF
Section of
(4) Keep the setting of the RF OUTPUT
Receiver
control as high as possible without causing dis-
on the ATTENUATOR db control to provide a
a. Bandpass Measurement. The response curve
proper impedance match to the input of the re-
of the RF portion only of a receiver may be
ceiver.
analyzed by following the procedures in (1)
through (6) below.
screen; make adjustments and measurements as
(1) Connect the RF OUTPUT jack of the
sweep generator to the input terminals of the
receiver through a matching pad; balun, or dum-
(6) If the response curve has sharp changes,
and p.
(2) Connect a suitably shielded output ca-
ble from the EXT DET jack to the dc load re-
b. Eliminate of Hum. If the forward and re-
sistor of the receiver mixer. (This connection
turn traces cannot be brought into coincidence
may be a test point on the receiver.)
when phasing is attempted, the trouble is proba-
Figure 3-4. Setup for testing complete receiver.