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XR3/XR6 Frequency Change Procedure Page 3 of 7

IS07012 Issue 1.0

(a) Locate the transmitter configuration

sheets that were included with the

Proof of Performance documents

shipped with the transmitter. Page # 1

of the configuration sheets includes

the location and values of the

capacitors that were installed at the

factory. The capacitance value of

each capacitor is stamped on the

capacitor.

(b) Using the Microsoft

®

Excel

®

spreadsheet, on the CD that was

included with this document, enter the

new carrier frequency and the site

altitude in the appropriate fields. The

spreadsheet will calculate the proper

capacitor values, inductor tap settings,

and spark gap setting for the new

frequency. Refer to Appendix A at the

end of this document for instructions

on using the spreadsheet.

(c) Carefully remove the capacitors from

the three capacitor banks and check

their stamped capacitance values (see

Figures 2 and 3 for capacitor

locations). Retain all hardware.

NOTE

When installing different sized capacitors

in one capacitor bank, you may need to

use spacer shims (Nautel Part # 202-6070

and/or 202-6070-01). Also note that M4

(4 mm), M6 (6 mm), and M8 (8 mm)

hardware is used to secure the different

size capacitors.

When using a spacer with a Nautel Part #

CS74 capacitor (200 pF), use the Nautel

Part # HMSH15 bolt.

(d) Using the spreadsheet’s calculated

results, arrange the capacitors

required for each of the three

capacitor banks using the capacitors

that were supplied with the frequency

change kit and the capacitors that

were removed from the transmitter.

Figure 2: Cap Bank 1, L1 and L2

Figure 3: Cap Banks 2 and 3; L3, L4 and L5

CAUTION

When installing capacitors, do not

over-tighten securing hardware or

allow hardware to bottom out on the

capacitor body. Failure to observe this

caution can cause a mechanical failure

of the capacitor.

Bank3

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