SILTRONIX 1011B Betriebsanleitung PDF herunterladen (Seite 13)

Dle alignment procedures presented in this section are rou-

tine touch-up procedures for all tuned circuits and other

adjustments. It is recommended that the procedures be

performed in the order presented. However, if complete

realignment is not required (as may be the case when just

one tube is replaced), perform just those procedures re-

quired. Refer to Figures 6 and 7 for component placement.

2. The alignment of transmitter circuits involves the adjust-

ment of tuned circuits in the VFO Amplifier, VI; the

Transmit MIXER, V2; and the DRIVER stage, V3. It is

recommended that a 50 ohm dummy load be connected

to the antenna jack during this series of adjustments.

CD Set the tuning dial to approxima tely ~8.3 MHz,

and the DRNERcontrol at 12 o'clock.

RECEIVER AliGNMENT

Receiver alignment involves only the adjustment of the

Second I.F. coil. The R.F. coils which affect receiver per-

formance are also used in the TRANSMIT mode. Their ad-

justment is covered under "TRANSMITTER AUGNMENT".

@ Set P .A. LOAD control to 9 0 'clock.

0 Set METER switch to P .A. CATHODE.

@ Press Mic. button. Check idling CUlTent. It should

be on the "delta" symbol when the CARRIER

~. BALANCE control is nulled, and the CARRIER

INSERTION control is fully counter clockwise.

Adjust P.A. BIAS control if necessary.

Q) After allowing approximately five ~i"utes for warm-

up, tune the receiver to the middle of the band and on

a "clear" frequency.

0 With Mic. button pressed, adjust CARRIER BAL-

ANCE control for slight increase in meter reading,

50 to 60 ma. Adjust P .A. TUNE c{Jntrol to reson-

ance (dip).

0 Adjust the P.A. TUNE, P.A. LOAD, AND DRIVER

controls for maximum noise.

CD Adj~st the Second I.F. coil (LB01) for maximum

background noise.

CD Adjust coils LI0l, L201,and 1301, for maximum

reading. When reading goes higher than 80 ma., or

so, adjust CARRIER BALANCE control for 60

ma. again.

S-METER ADJUSTMENT

With the antenna disconnected, R.F. GAIN control fully

clockwise, and METER switch in S-METER position, set

R70S, located on the rear panel, for zero meter reading.

Make sure no local signals are being received.

@ Adjust coils carefully for maximum peak. Exercise

caution with CARRIER BALANCE control. Do

not exceed 100 ma. reading for more than a few

seconds. Be sure P.A. TUNE control is resonated

(adjusted for "dip" in meter reading).

TRANSMITTER ALIGNMENT

3. Power Amplifier Neutralization.

To adjust the Power Amplifier Bias:

0 After allowing approximately five minutes for

warm-up, tune transmitter to approximately 283

MHz.

Switch METER switch to P.A. CATHODE posi-

tion.

Rotate CARRIER INSERTION control fully

counter clockwise. .

After allowing approximately five minutes for

warm-up, key the transmitter with the microphone

switch. Without speaking into the microphone, ad-

just the Carrier Balance control on the bottom

cover for a Null.

@ Set the P.A. LOAD control to 9 o'clock.

@ Set METER switch to P .A. CATHODE.

0" Key the transmitter with the Mic. button, and

without speaking into the microphone, adjust the

CARRIER BALANCE control for a reading of

approximately 100 ma. Quickly adjust the

DRNER control for a peak. Quickly re-adjust the

CARRIER BALANCE con trol to 100 ma. if it in-

creased to a higher reading.

Again key the transmitter with the microphone

switch, and without speaking into the microphone,

adjust the P.A. BIAS control on the rear panel

until the meter reads 40 ma. of idling current.

This point is indicated on the meter by the "delta"

symbol.

0 With the Mic. button still pressed, rotate the P.A.

TUNE control through its range from 9 o'clock to

3 o'clock. You will note a pronounced "dip" in

meter reading at resonance. Observe any tendency

:'t ,',',' ",'" -'~-".-

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