AMX TXC16 Plus Specifications download pdf (Page 170)

SG-2000 MANUAL 163

The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA

If the frequency is lower than 71.64 MHz, the voltage on TP602 should be 8

VDC.

If the frequency is higher than 71.64 MHz, the voltage should be 0 VDC.

You should be able to change the frequency below or above 71.64 MHz by

adjusting L410 and, if the PLL works correctly, it should change the voltage on

TP602 from 8 VDC to 0 VDC. If the PLL works correctly, it may be that the

VCO is oscillating outside the limits of the PLL's capacity to adjust. Check for

bad components in the VCO.

Repeat the above procedure for any of the VCOs.

23.1.28 Voltage Values for the Exciter PCB

Measurements in the following table were made under the following

conditions:

Receive: 10 MHz, A3J, USB, VOC, 32 mV RMS sinusoidal signal from RF

generator. AGC at minimum.

Transmit: RF Output of Exciter connected to 50? dummy load.

- J504 and J503 pins 9 and 10 have 1.5 Vpp sin.

- 10,000.0 KHz, A3J, transmit and receive.

- will produce 2.0 Vpp on the Collector pin of Q103 (for Rev H and later

boards only, REV G and earlier will produce 2.8 Vpp).

- ALC at minimum.

The Test Area refers to the marked areas on the Exciter schematics (J30100920,

sh1-6) following the tables

The following tables give approximate measurements for DC voltage and AC

voltage peak to peak for Exciter boards of revision G and earlier and revision H

boards.

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 241 242

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AMX TXC16 Plus Specifications Page 170