DRAKE SPR-4 Spezifikationen PDF herunterladen (Seite 50)

SPR-4 R.F.

VOLTAGE CHART

Trans is tor

Q7,

Q10

Q23

Q24

Q11

Q17

Q21

Q27

Function

Loop Amp

RF Amp

1st Mixer

2nd Mixer

1st IF Amp

2nd IF Amp

Range Xtal

Osc.

Premixer

Xtal

Osc.

Xtal

Osc.

Buffer

Neg .

Supply Driver

BF0

Drain

Collector

131”

215**

900**

310

2.5V

2.8V

4.25V

Gate 1

2.15V

Gate

480

Source

1.35V

All

voltages are millivolts RMS

except

those marked V (volts)

MEASUREMENT CONDITIONS

Set signal generator to 7.0 MHz and 1 millivolt at the SPR-4 antenna

jack.

Tune

in generator on LSB for maximum S-meter reading with RF

Gain

fully

clockwise and accessory switch on NORM and notch in OFF

position.

Measurements taken without 5-NB installed . Boonton Mode1

91 CA RF voltmeter used.

100:l

divider used on measurements above

500

mV.

SPR-4 tuned to 1 MHz LSB with 1 millivolt R.F.

across

external

47 ohm

emitter

resistor .

Measurement of generator output must be

done

with SPR-4 turned off.

Large variations (-50% + 100%) from values shown are typical.

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 65 66

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