5-12
888-2586-001
9/15/06
WARNING: Disconnect primary power prior to servicing.
Platinum Z16HD+
Section 5 Maintenance and Alignment
top of the transmitter. Slide it up enough to get to the Isolation Boards
and tighten the top clamp to hold it in place.
STEP 5
If there is not enough room to raise the harmonic filter very far, then the
back section of the upper PA deck plate can be removed and the
harmonic filter can be raised just until the bottom clears the lower PA
deck plate and then pulled out the back of the transmitter.
STEP 6
To re-install, simply reverse this procedure.
5.8
Directional Coupler Removal and Replacement
First, note that 2 of the couplers are labeled Forward sampling and one is Reflected.
They cannot be interchanged as the coupling ratio is different. The difference is how far
the coupler is inserted into the base. The Forward couplers are not inserted as far as the
reflected and have a small gap between the coupler and the base.
Before removal, mark each coupler for the following:
a.
Proper position - the couplers should go back into the same hole from which they
came.
b.
Orientation - mark the couplers with an arrow pointing up to be sure and replace
them correctly. Reversing a forward coupler makes it read reflected and vise-
versa.
c.
Cable Number - write on the coupler, the number of the BNC cable which
attaches to it.
d.
A calibration of the Forward or Reflected power should be done depending on
which coupler was replaced.
NOTE:
The directional couplers are held in place on the harmonic filter with 2 hose
clamps. Be sure to place the clamps as far toward the edge of the coupler body as
possible and do not over-tighten.
NOTE:
If both couplers are being replaced at the same time, Reflected Power should be
calibrated first, then the Forward Power. An external meter is required to cali-
brate Reflected Power in this case.
5.8.1
Typical Coupling Ratios
Typical Coupling Ratios for the directional couplers is as follows:
Summary of Contents for Platinum Z16HD+
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