I.F. Alignment Step-by-Step R.F.
Alignment or
The I.F. setup shows the orientation of Tracking
the radio receiver in the figure. A power meter is
used in addition to the standard signal
generator to measure the output power of the All preparatory measures for I.F.
radio receiver. Orientation is R.F. Alignment. The change is to
select different bands to track.
Preliminary Steps for I.F. Also, use the recommended dummy
antenna for the frequency band in question.
Alignment Follow these steps:
A standard signal generator should be
Preparation procedure for I.F. Alignment Before tuned to the desired frequency, as shown
alignment, the following precautions must be below. The signal is not directly connected to
taken. the input of the receiver. Instead, the probe is
held close to the receiver's antenna coil. The
1. A.V.C / A.G.C. Must be inoperable. frequencies that need to be tuned for the
2. Keep volume and tone control in the standard signal generator and receiver and the
maximum resistance position. tunes that are made are shown step by step in
3. The speaker should be replaced with an A.F. the table below.
output power meter with the correct impedance
range that matches the speaker's impedance. If the receiver has multiple short wave
4. The radio receiver should be tuned to the bands, the above process should be performed
midwave band. on all different S.W. It will be repeated. The
5. The radio receiver should be tuned to the band is tuned to the lowest and highest
lowest frequency in the medium wave range. A frequencies, the oscillator coil is tuned to the
0.1 μF capacitor is in series with R.F. Lead lowest frequency, and the oscillator trimmer is
when the signal is injected. tuned at the high end. The antenna coil should
6. The core of I. Transformers should be be adjusted to the center frequency of the band.
configured using a magnetic screw driver or This completes the receiver tracking.
using a special wire tuning alignment tool.
Submitted to:
Sharry Mar Manalo
What is Alignment? Who is “The Phantom”?
Alignment is the process of adjusting the "The Phantom" or "The Phantom
Dabbler" is an unknown person who tried to fix
IF and RF circuits for best reception (sensitivity, the set in front of him. What sets the phantom
selectivity, no howling) and accurate frequency / apart from other garages is that the phantom
Alignment of FM
wavelength readings with the tuning dial. The inevitably makes things worse.
set was properly tuned at the time of
manufacture, but may need to be readjusted due He is the one who ruined the
to component aging or drifting, or someone (the alignment and broke the core of the IF
Radio Receiver
transformer in the process. He is the person
"phantom") having previously tampered with the
who placed some components in random
settings. positions under the chassis. He is the one who
disconnected something and accidentally
It can be compared with engine tuning. It reconnected it. You get a general idea!
will probably run without proper engine
conditioning, but it isn't. And if it's far from the
tone, it probably won't run at all. However, unlike
the engine, a misaligned radio does no harm Deciding if AM Realignment
and does not work properly.
is Necessary
To do the job right, you need an RF
The usual sign that the device needs
signal generator, how to display the output level,
to be readjusted to MW and LW is poor
the right tools to adjust the settings, and some reception and interference. Alignment usually
patience. Unless your settings get stuck or doesn't change much on its own, so if you
broken, it shouldn't be too difficult if you follow don't have evidence of past interference, you
the steps on the maintenance sheet carefully. should first look for other causes of the
problem. In particular, check the AGC and IF
decoupling capacitors and resistance.
Valve replacement can have a slight
impact on alignment, but unless the
replacement is a direct equivalent, this is
usually not sufficient to cause poor reception.
Submitted by: If the IF transformer and HF trimmer are noisy
in advance and the performance is below
Rain Kendall Pautanes average, it is worth checking the alignment. It
is highly recommended to get a copy of the
service sheet for the set before attempting
readjustment.
