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UHF Analog Driver/Transmitter/ Chapter 5, Detailed Alignment Procedures
Translator
LX Series, Rev. 3 5-9
MAJOR TUNING , such as changing the
Notch Depth or moving the Notch
Frequency more than 1 MHz, the Outer
Conductor and the Center Conductor of
the Trap Section must both be moved.
This requires a RF Sweep Generator to
accomplish. Apply the Sweep signal to
the Input of the Trap Filter and monitor
the Output. Loosen the Clamp holding
the Outer Conductor in place and make
the length longer to Lower the frequency
of the Notch or shorter to Raise the
frequency of the Notch. Loosen the
Center Conductor with an Allen Wrench
and move it Deeper for a Lower
Frequency Notch or out for a Higher
Frequency Notch. These adjustments
must both be made to change the Notch
Frequency. Moving only the Center
Conductor or the Outer Conductor will
affect the Notch Depth in addition to the
Center Frequency. The variable that is
being adjusted with this procedure is the
length of the Center Conductor inside the
Trap Filter. The gap between the Trap
and the Main Line should not be changed.
Moving only the Inner or the Outer
Conductors by itself will affect the Gap
and the Notch depth. To affect the Notch
Depth Only, both sections will have to be
moved. The Notch Depth is controlled by
the Gap between the Center Conductor
and the Trap Section. This Gap also has
an effect on the Center Frequency. To
Deepen the Notch, Shorten the Outer
Conductor and pull the Center Conductor
Out until the Notch is back in the same
place. Move the Sections in the opposite
direction to make a Shallow Notch.
NOTE : The Trap Filter is typically
adjusted for a notch depth of 10 dB.
5.4.1 The Effects of Tuning the
Output Trap Filter
Lengthening Outer Conductor Only -
Notch Frequency Up, Shallower Notch.
Shortening Outer Conductor Only -
Notch Frequency Down, Deeper Notch.
Inserting Inner Conductor Deeper -
Notch Frequency Down, Deeper Notch.
Inserting Less Inner Conductor -
Notch Frequency Up, Shallower Notch.
Tuning Bolt In - Notch Frequency
Down.
Tuning Bolt Out - Notch Frequency Up.
Moving both Inner and Outer
Conductors to keep the Same Gap
inside
- Center Frequency Moves, Notch
Stays the Same.
After tuning has been completed, tighten
the Clamp and the Allen Screws that hold
the Conductors. Use the Fine Tuning
Bolts to bring the Frequency In. The
Final Tuning Adjustments should be
completed with the Transmitter driving
the Output Trap Filter for at least one
hour to allow for warm-up drift.
The Transmitter is ready for normal
operation.
NOTE:
In Dual Exciter Systems, with an
exciter switcher, repeat the above
procedure with Exciter B selected as the
On Air Exciter. The exciter switcher
must be in manual.
This completes the detailed alignment
procedures for the LX Series transmitter.
If a problem occurred during the
alignment, help is available by calling
Axcera field support at (724) 873-8100.