DRAKE SPR-4 Spezifikationen PDF herunterladen (Seite 33)

6.5

AVC ALTERATIONS

CONTROL OR SWITCH

Band or Range switch

Crys

tal

switch

Function

Mode

Audio Gain

Transceive

Anti -Vox

S ideband

Preselector

S PR-4

T-4XB

3.5

---

SSB

LSB

--_

3 o’clock

---

spot

---

Full clockwise

---

Lower

Both the SPR-4 and T-4XB preselectors

should be set to about 6.5 and peaked

for the loudest “canary” sound from

the speaker.

Adjust C-2 in the T-4XB until the “canary” sound slows down to only a

few chirps a second and then zero chirp a second and

all

that is heard is

a single tone.

6.5.1

GENERAL

DESCRIPTION:

It is possible to alter the SPR-4 AVC system by simple connections to

two circuit boards .

These alterations allow the gain to be

controlled

manually with the RF GAIN control and allow fast AVC on CW only instead

of the supplied slow AVC response.

6.5.2 FAST AVC ALTERATION

Fast AVC

can

be obtained on CW for SPR-4’s with serial numbers above

1000, by placing a jumper wire between the two terminals at the

center

of the 2nd mixer board .

One

terminal has a white/yellow wire

connected

to it and the other terminal is unused.

A resistor

placed

between these

terminals

will

allow an AVC response between fast and slow. A 6.8

megohm resistor will halve the AVC response time.

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