Equipment information

Johnson Viking 240-305-2 Other
Manufacturer
Johnson
Model Viking 240-305-2
Date
Category: Radio, Communication
Group Other
Description SSB Generator
Information
                                    The SSB Adapter is a filter type SSB generator capable of
operating on all amateur band SSB frequencies between 3,8 to
29.7 megacycles with an approximate output of 2 watts. The
equipment is designed for use with the Valiant I and II
utilizing the Valiant's VFO for frequency control and last
two stages for power amplification.

All the Adapter R. F. stages are bandswitched and pretuned
except for the amplifier tank circuit. The 1st and 2nd mixer
stages utilize the 7360 tube capable of long term stability
and suppression of at least 40 db. The 7360 tube is also
used as a combined crystal oscillator and balanced modulator
providing a high degree of stable carrier suppression. The
crystal filter is the same as used in the Viking Invader
transmitters with the same stable operation and sharp
response. The output stage consists of a "Pi” network with a
fixed 50 ohm output impedance.

The audio system includes a fixed audio oscillator for use
during tuning adjustments. The two stage audio amplifier has
an excellent response and is designed for use with a high
impedance microphone. The control circuits provide for
MANUAL, VOX and P.T.T. operation of the Adapter and the
Valiant transmitters.

The filament and plate voltages to operate the Adapter are
provided by a separate power supply. All the cables
necessary to connect the Adapter to the power supply and to
the Valiant transmitter are furnished with the Adapter.

These manuals are available for the above equipment:

Johnson -- Viking 240-305-2 --
File name Johnson-5505-Manual-Page-1-Picture
Manual Type
Pages 33
Size 800.40 Kbytes (819613 Bytes)
Language english
Revision
Manual-ID/Number
Date
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 5176049f0a3863e25c43839fa4f01a43
Downloads 145 since 01 March 2014
Information
A.	DESCRIPTION AND SPECIFICATIONS	1

1.	Electrical Description	1

2.	Mechanical Description	1

3.	Specifications	1

B.	FUNCTIONAL DESCRIPTION OF SYSTEM	2

C.	UNPACKING AND INSPECTION	2

D.	INSTALLATION	2

1.	Adapter with the Valiant	2

2.	Adapter with other units	5

E.	FUNCTION AND LOCATION OF CONTROLS AND METER	6

1.	Front panel	6

2.	Rear of chassis	6

F.	OPERATION	6

1.	SSB Operation (MANUAL)	6

2.	SSB Operation (P.T_T.)	7

3.	SSB Operation (VOX)	7

4.	AM and CW Operation	10

G.	ALIGNMENT PROCEDURE	10

1.	Sideband generator	11

2.	Multiplier stage	12

3.	Mixer stages	12

4.	First mixer balance	13

5.	Harmonic stage	14

6.	Reneutralization of final amplifier	14
TABLES

1.	Adapter Resistance Measurements

2.	Adapter D.C. Voltage Measurements

3.	Adapter R.F. and Audio Voltage Measurements
PARTS LISTS

SSB Adapter	18-21

Power Supply	21
Johnson-5505-Manual-Page-1-Picture
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