Digital Monitoring XR6 Manual do Utilizador descarregar pdf (Página 6)

Page 4 of 7 XR3/XR6 Frequency Change Procedure

Issue 1.0 IS07012

(e) Install the capacitors in each bank

using hardware from the frequency

change kit and retained hardware. Try

to distribute the capacitors within

banks 1 and 2 so that both ground

plates are supported (e.g., if installing

two capacitors in bank 1, install one in

the upper left location, C1, and the

other in the lower right location, C6).

(f) Using the spreadsheet’s calculated

results for Initial Number of Turns, set

the taps for inductors L1 through L6,

in the rear of the transmitter (see

Figure 4). NOTE: Tap connections are

made using quick disconnects and the

shorting jumper should be installed

across unused turns, with a spacing of

two coil taps between the tap and the

shorting jumper.

Figure 4: Inductor (L1 through L6) Taps

(g) Set the taps for inductors L3, L4 and

L5 by loosening the clamp screw on

the inductor’s tap clamp and moving it

to the position indicated on the

spreadsheet in the Initial Number of

Turns section. NOTE: Count the turns

from back to front on inductors L3 and

L5 and from bottom to top on inductor

L4 (see Figure 3 for inductor location).

(h) Use a set of feeler gauges to set the

spark gap, located to the right of

capacitor bank 3, for the Spark Gap

distance (in inches) indicated on the

spreadsheet.

2.3 RF Power Module Tuning

(a) Remove all RF power modules from

the transmitter. One at a time, set an

RF power module near the front of the

transmitter, so that the test cable can

be connected.

NOTE

If necessary, refer to the XR3/XR6

Troubleshooting Manual for RF power

module assembly detail drawings as well

as connection and tuning procedures

referenced in this section.

(b) Remove both side covers from the RF

power module. Remove the cover

from the RF drive tuning assembly.

Loosen the locking nut on the feed

screw. Reinstall the cover on the RF

drive tuning assembly.

(c) Connect the test cable (Nautel Part #

202-5010) and the test load (Nautel

Part # 176-5720-01) to the RF power

module.

(d) Apply ac power to the transmitter and

set the RF output to 0 W by pressing

the Power – Increase and Power –

Decrease buttons simultaneously.

Press RF On.

(e) Monitor TP14 and TP15 of the

module’s RF drive control PWB with

an oscilloscope. Adjust the RF drive

tuning manually, using a 10 mm nut

driver, until the zero-crossing points of

the TP14 and TP15 waveforms

coincide (see Figure 5). The voltage at

the gate lead of the FET in any PA

shall be between 22 and 25 V pp.

Quick-

Disconnect

Taps

Shorting

Jumpe

r

Turns

In-Circuit

1 2 3 4 5 6 7 8 9 10 11

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