AMERITRON AL-1200 User Manual download pdf

AMERITRON QSK-5PC Instruction

Manual

AMERITRON QSK-5PC

T/R SWITCH PC BOARD

INTRODUCTION

The Ameritron QSK-5PC is a PIN diode QSK circuit board designed

for use in Ameritron's AL-80A, AL-80B, AL-82, AL-1500 and AL-

1200 amplifiers. Ameritron can not assist customers with the

installation of the QSK-5PC in any amplifier other than these

five units. The QSK-5PC is rated to carry the full power of

these amplifiers except on SSTV, RTTY and PACKET. On these high

duty cycle modes the QSK-5PC will handle a maximum of 1000 watts

with a 5 minute on and two minute off duty cycle.

Ameritron also offers a "stand-alone" PIN diode QSK adapter

called the QSK-5. The QSK-5 is an entirely self-supporting unit

with an internal power supply. The QSK-5 is the best choice for

applications where maximum convenience and flexibility is de-

sired. The QSK-5 connects to the station equipment with standard

connectors to facilitate installation and removal.

QSK BOARD OPERATION

Keying Circuit Timing:

The timing of the transceiver keying circuit is critical with

any QSK switch. The transceiver MUST

have the proper sequencing

of RF and QSK output lines. The transceiver QSK line must pull

low BEFORE RF appears on the output connector and release AFTER

the RF envelope reaches zero to operate with any QSK switch. A

few transceivers do not meet this requirement even though they

are advertised as QSK transceivers. There is no way to

completely correct this problem without modifying the

transceiver.

One indication of improper timing is the flashing or failure of

fuse lamps LP1 and LP2. These lamps protect the transceiver

from failure of the receive diodes. Any component failure that

causes the receive diodes to conduct during the time interval

the transmit diodes are conducting will connect the amplifier's

output directly to the input. This may result in an oscillation

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Summary of Contents

Page 1

AMERITRON QSK-5PC Instruction Manual AMERITRON QSK-5PC T/R SWITCH PC BOARD INTRODUCTION The Ameritron QSK-5PC

Page 2

AMERITRON QSK-5PC AL80A/82/1200/1500 Installation QSK-5PC INSTALLATION FOR THE AL-80B 1. Remove the Amplifier&apos

Page 3

Ameritron QSK-5PC AL-80B Installation THE SMALL BYPASS CAPACITOR. Solder this wire to the ground lug of this jack. 6. T

Page 4

Ameritron QSK-5PC AL-80B Installation under the QSK plate to be sure there are at least 3/8" clearance from the recti

Page 5

Ameritron QSK-5PC AL-80B Installation 19. Solder the free end of the RG-58 cable that comes from the band switch and thro

Page 6

Ameritron QSK5-PC Parts List C19 .022 uF, 50 V, Mono 205-3220 C20 .01 uF,

Page 7

AMERITRON QSK-5PC Instruction Manual that can cause damage to the transceiver. NEVER REMOVE OR DEFEAT THESE LAMPS. They

Page 8

AMERITRON QSK-5PC Instruction Manual TRANSMIT: In TRANSMIT the circuit functions as follows: Point D is held below 2 vol

Page 9

AMERITRON QSK-5PC Instruction Manual shake." This jack will then pull low in the transmit mode. The maximum rating

Page 10

AMERITRON QSK-5PC Instruction Manual SWR SSB CW RTTY 1:1 2500 W 2000 W

Page 11

AMERITRON QSK-5PC AL80A/82/1200/1500 Installation anode connector with an insulated clip lead. NEVER DISCHARGE THE ANODE DIRECTLY TO

Page 12

AMERITRON QSK-5PC AL80A/82/1200/1500 Installation 9. Solder the new large and small coaxial cables to the relay the same way as the

Page 13

AMERITRON QSK-5PC AL80A/82/1200/1500 Installation conductor of the RG-178B/U RF cable (smallest diameter coax), that was originally c

Page 14

AMERITRON QSK-5PC AL80A/82/1200/1500 Installation 21. Solder the yellow wire supplied to the normally open termi-nal of the relay wh

AMERITRON AL-1200 User Manual

Browse online or download User Manual for Audio amplifiers AMERITRON AL-1200. AMERITRON QSK-5PC Instruction Manual AMERITRON QSK

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AMERITRON AL-1200 User Manual

Browse online or download User Manual for Audio amplifiers AMERITRON AL-1200. AMERITRON QSK-5PC Instruction Manual AMERITRON QSK

Summary of Contents

More documents for Audio amplifiers AMERITRON AL-1200

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