SSB-1 Single Sideband Radio Communication Equipment: Addendum and Technical Manual Corrections

June 1957 - February 1961

Addendum No. 2 (June 1957)

This addendum applies to all SSB-1 sets with Serial Numbers 5701 and above, detailing the following modifications:

Shorting sections added to Switch Wafers S201, D, H, and I.
Auxiliary Channel Switch wafer S201-J added.
Auxiliary Channel Switch Terminal Board, TB202, added.
Receiver Antenna Link, TB201, added.
Resistors R287 and R288 added.

The Schematic Diagram D1259266 is to be used for all sets with Serial numbers 5701 and above.

Filter Types

Only one type of Mechanical Filter, the RCA type MFU-250-1, is used in sets with Serial Numbers 5701 and above. This filter passes a sideband of approximately 3 kc wide while rejecting the 250 kc carrier. Accessory components for this filter are listed in the Parts List covering Addendum No. 2.

Explanation of Additions

Item 1 (Shorting Sections): These remove unused coils from the radio frequency circuits of the transmitter and receiver, reducing losses and improving efficiency.
Item 2 (Auxiliary Channel Switch Wafer S201-J): An extension of the Channel Selector Switch, its five contacts are brought out to terminal board TB202. One contact is common, allowing AC or DC current to be applied in series with a control device like a relay indicator lamp.
Item 3 (Auxiliary Channel Switch Terminal Board TB202): Provides a terminal connection for the Auxiliary Channel switch and any outer contacts required for control operation of auxiliary equipment.
Item 4 (Antenna Link on TB201): Removed when a pre-amplifier for the receiver or a linear power amplifier for the transmitter power amplifier is required. Input and output terminals of such amplifiers connect to terminals B and A.
Item 5 (Resistors R287 and R288): Connected across L220 and L221, these resistors provide greater receiver stability for channels 1 and 2, improving reception.

Refer to Transmitter Receiver Schematic (Figure 29-C) for further details.

Parts List Updates

SSB-1 Transmitter-Receiver Unit (For Serial Numbers 5701 and above)

Reference Symbol	Quantity	Locating Function	Name and Description	Stock Number
C238	4	F1201 Input	Capacitor, Mica: 360 uuf. ±2% 500 V dc; GM.206316-G.	006-274
C242		FL201 Output	Same as C238.
C293		FL202 Input	Same as C238.
C294		FL202 Output	Same as C238.
C312	4	FL201 Input	Capacitor, V.C.: 20-125 uuf. Centralab 823-AN	087-175
C313		FL201 Output	Same as C312.
C314		FL202 Input	Same as C238.
C315		FL202 Output	Same as C238
FL201	2	Transmitter Sideband	FILTER, Mechanical: Band-pass 250 kc; Upper side-band; 3 kc band-width at 6db. Type RCA MFU-250-1.	136-036
FL202		Receiver Sideband	Same as F1201.
R285	2	FL201 attenuation	Resistor, Comp; 15,000 ohms 1/2 w. ±10 %
R286		FL201 attenuation	Same as R285
R287	2	L220 swamper	Resistor, comp; 10,000 ohms ±10% Jan RC20BF103k.
R288		L221 swamper	Same as R287.

Diagram Description: Auxiliary Channel Switch and Receiver Antenna Link

A diagram illustrates the wiring of the Auxiliary Channel Switch and the Receiver Antenna Link. The Auxiliary Channel Switch has a central common terminal and four other terminals labeled CHANNEL 1, CHANNEL 2, CHANNEL 3, and CHANNEL 4. The Receiver Antenna Link has two terminals, A and B, and is connected to the REC ANT (Receiver Antenna) terminal. The SERIAL NO. is also indicated on the diagram.

Schematic Diagram D1259266 (Figure 29-C): Transmitter-Receiver Schematic

This detailed schematic diagram illustrates the internal circuitry of the SSB-1 Transmitter-Receiver, applicable to serial numbers 5701 and above. It is divided into several functional blocks:

Transmitter Section: Includes stages like IPA (Intermediate Power Amplifier) and PA (Power Amplifier) with tubes V201 (6CL6) and V202 (6146). It features modulation indicator (MOD IND) and AM modulation circuits. Key components include various capacitors (e.g., C201-C222, C311), resistors (e.g., R201-R211), and inductors (e.g., L201-L212).
Receiver Section: Comprises RF AMP (RF Amplifier) with V211 (6BA6), Mixer with V212 (6BE6), IF AMP (Intermediate Frequency Amplifier) with V214 and V215 (6BA6), and AF DEMOD AMP (Audio Frequency Demodulator Amplifier) with V216A and V216B (1/2 12AT7). It includes mechanical filters FL201 and FL202 (RCA MFU-250-1).
Modulator and Oscillator Sections: Features 1st, 2nd, and 3rd BAL MOD (Balanced Modulator) stages with tubes like V205, V206, V207 (12AT7). Crystal oscillators (XTAL OSC) with Y201-Y206 are present for frequency generation.
Control and Linkage: Shows connections for Auxiliary Channel Switch (S201-J), Receiver Antenna Link (TB201), and various control switches (S201-A, B, D, E, F, G, H, I). Terminal boards TB201 and TB202 are depicted for external connections.
Power Supply Connections: Indicates power input and connections to various voltage rails.

The schematic details component values (e.g., resistor ohms, capacitor uuf) and tube types. Notes specify that all resistors are in ohms (K=1000, MEG=1,000,000) and all capacitors are in micromicrofarads (uuf). This schematic specifically applies to equipment with serial numbers 5701 and above.

Temporary Correction T-1 (May 1958)

This correction applies to the Technical Manual for Type SSB-1 Single-Sideband Radio Communication Equipment (NAVSHIPS 92917). It is effective only after Field Change Number 1 has been accomplished.

Field Change Number 1-SSB-1 aims to provide satisfactory operation of the SSB-1 equipment from a standard naval remote system.

The Technical Manual should be corrected with pen and ink according to the following instructions. If space is insufficient, a notation "See T-1" should be made. These pages are to be stapled on the reverse side of the front cover of the manual as a permanent record.

Corrections Table (T-1)

Page	Ref.	Corrections To Be Made
Title		Delete "230"
	Figure 1.	Paste new Figure 1 over original Figure 1
1	Para. III.	Delete "Telephone" in paragraph III.5.
2	Illustrations	Delete reference to Figure 19.
4	TRANSMITTER AUDIO INPUT	Change sub-paragraph a) to read as follows: a) Single Button Carbon Microphone From Local Handset or From Standard Navy Remote System.
5	LINE VOLTAGE	Delete "230"
5	LAMPS	Change "5" to "2"
7	Figure 3	Paste new Figure 3 over original Figure 3
8	Section I Para. 5	Delete the entire last sub-paragraph.
8	Section I Para. 6	Change the second sub-paragraph to read as follows: The equipment operates from 115 volt, 50 to 60 cycle single phase power source and requires approximately 310 watts for full power output. The equipment is connected to the standard navy remote system by a twelve wire cable for the control circuits, and a two wire audio cable for external speakers.
12	Section II Para. 4.h.	Line 3. Change "T-106" to "T-107"
13	Figure 6	Paste new Figure 6 over original Figure 6.
14	Section II Para. 4. h.	Line 10. Change to read as follows: "operation or remote operation."
14	Section II Para. 5	Change sub-paragraph a. to read as follows: a. Input voltage to the power supply circuit is 115 volts, 50/60 cycle. Refer to figure 6.
14	Section IIXX Para. 5	Change sub-paragraph d. to read as follows: d. Turning TRANSMITTER switch S103, on energizes relay K102. K102 applies power to the primary of transformers T101, T102 and T108. T101 supplies filament power for all the transmitter tubes. T102 supplies plate voltages for the HV rectifiers V101 and V102 (type 5R4GY), connected in a full-wave center tap circuit with plates in parallel to supply + 600 volts dc through a single-section choke input filter to the plates of power amplifiers V201 and V202. T108 secondary supplies -20 volts dc through a rectifier, Z101, and a double-section choke input filter for the standard navy remote system.
14	Section IIXX Para. 5	Change sub-paragraph g. to read as follows: g. LOCAL-REMOTE switch S106 selects the local handset or any one of the remote units which may be connected to the standard navy remote system. It switches the microphone circuit, the -20 volts ac control voltage, the Transmitter Start-Stop control circuit and the power for the indicator lamp at the selected remote position.
15	Section III Para. 4	Line 1. Change "may be either 115v or 230vx ac," to read "is 115v ac,".
15	Section III Para. 4	Delete all reference to "230v, 50/60cps"
15	Section III Para. 5.	Change paragraph 5. to read as follows: 5. REMOTE CONNECTIONS. Connections for remote stations are provided at terminal board TB 103 on the power supply chassis. Connections are made through the standard navy remote system. Control circuit connections are made using a MSCA-12 Cable. Audio connections are made using a TTHFWA-1 1/2 Cable connected to terminals 13 and 14 of TB103.
22	Figure 10	Paste new Figure 10 over original Figure 10.
23	Section IV Para. 2.	Line 1. Change to read as follows: Operation of a simplex radio telephone station using an SSB-1 with the standard navy remote system as shown in figure 11 is as follows:
23	Section IV Para. 2.	Change sub-paragraph a.(3) to read as follows: (3) Turn TRANSMITTER switch (L) on.
23	Figure 11.	Delete remote numbers 2 and 3.
23	Section IV Para. 2.c.	Change sub-paragraph (2) to read as follows: (2) On the power supply chassis, turn LOCAL-REMOTE switch (L) to Remote position.
23	Section IV Para. 2.c.	Delete sub-paragraphs (3), (4), and (5). Add new sub-paragraph (3) as follows: (3) The standard navy remote system is used for remote operation of the SSB-1 equipment. The system may be monitored by plugging a headset into the PHONES jack. This circuit monitors both transmitted and received signals. The received signal only may be monitored on the speaker by turning switch F to SPEAKER.
24	Table 1 Power Supply Unit	LOCAL-REMOTE, Column 2. Change "4" to "2". Column 3. Change line 2 to read as follows: "standard navy remote system."
24	Table 1 Power Supply Unit	Delete all references to "REMOTE INDICATORS -1-2-3".
34	Table 3.	Change TB-103 to read terminals 1 through 18 respectively. Make corrections as per Table 3 this bulletin.
39	Figure 16.	Paste new Figure 16 over original Figure 16.
40	Figure 17.	Paste new Figure 17 over original Figure 17.
42	Figure 19.	Delete Figure 19.
52	PARTS LIST	After C129 add the following: C130 2 Filter capacitor in power supply Capacitor, Electrolytic, 2000 mfd., 15 v. Federal Stock Number N5910-244-5513 C131 Filter Same as C130
57	PARTS LIST	Delete all reference to DS104, DS105, and DS106.
59	PARTS LIST	After K101 add the following: K102 1 Start-stop relay Relay, coil 115 vac., 50/60 cycles, contacts dpst Struthers-Dunn type 21BDXX101 Federal Stock Number N5945-645-1954.
59	PARTS LIST	After L102 add the following: L103 1 filter choke Inductance, Dual Section, 08 h., 7v rms, 120 cps., 600 ma Federal Stock Number N5950-637-6433.
62	PARTS LIST	Delete all reference to R138, R139, R140 and R141.
63	PARTS LIST	Delete all reference to R142.
63	PARTS LIST	After R143 add the following: R144 Dropping resistor for Start-stop relay Resistor, wire-wound, 250 ohms, 10 watts, RW56G251 Federal Stock Number N5905-156-5965
64	PARTS LIST R229	Change "Name and Description" column to read as follows: Resistor, composition, 150,000 ohms, ± 10%, 1/2w, JAN RC20BF154K. Under "Stock Number" column add "270-154". Under "Quantity" column add "3".
64	PARTS LIST R230	Change "Name and Description" column to read as follows: Same as R229.
67	PARTS LIST S103	Change "Name and Description" column to read as follows: Switch, Toggle, spdt, momentary contact, Federal Stock Number N5930-050-2686. Delete "Stock Number" column.
67	PARTS LIST S106	Change "Name and Description" column to read as follows: Switch, Rotary, 1 section, 2 positions, 4 poles, Federal Stock Number N5930-260-3144. Delete "Stock Number" column.
67	PARTS LIST T105	Change "Locating Function" column to read as follows: 1 Speech input transformer. Change "Name and Description" column to read as follows: Transformer, Audio, 600 ohms to 25 ohms, Federal Stock Number N5950-645-1954. Delete "Stock Number" column.
67	PARTS LIST T106	Change "Reference Symbol" column to read as follows: T107. Change "Name and Description" column to read as follows: Transformer, Audio, primary 5000 ohms, secondary 4 ohms, 8 ohms, 16 ohms, 150 ohms, and 600 ohms, Chicago Transformer Co. type COH-1 (MIL-T-27A, Grade 1, Class R). Delete "Stock Number" column.
67	PARTS LIST T108	After new T107 add the following: T108 1 Negative voltage power supply Transformer, Power, step-down; primary 115v, 60 cycles secondary 20v, 1.04 amp., Federal Stock Number N5950-244-5513
70	PARTS LIST	After Y206 add the following: Z101 1 full wave rectifier Rectifier, Selenium, 4SF1B2-BBG, Federal Stock Number N6130-237-0147
71	PARTS LIST R408	Change "R139" to "R229"
72	PARTS LIST	Delete entire page 72.
73,74	Figure 28	Paste new Figure 28 over original Figure 28

Diagram Descriptions (Field Change IV)

Figure 1. Desk Installation

This figure shows the SSB-1 radio communication equipment installed on a desk, reflecting updates from Field Change IV. The unit is a rectangular console with various controls and indicators on its front panel. A telephone-style handset is connected to the unit. Manuals or books are placed next to the equipment.

Figure 6. Power and Control Circuits

This schematic diagram details the power supply and control circuits of the SSB-1 unit, updated to reflect Field Change IV. It includes transformers (T-101, T-102, T-103, T-104, T-108), rectifiers (V-101, V-102, V-103), and various tubes (V-104, V-105, V-106, V-107, V-108). The diagram shows filament and plate voltage supplies, bias regulation, and keying relay (K-101) circuits. Control switches (S-101, S-102, S-103, S-104, S-106, SW-101) are depicted, along with terminal boards (TB-101, TB-103, J204, J208, J209) for external connections, including a meter link, antenna, and speech clipper. The power input is specified as 115V, 50/60 CPS, with a "BATTLE SHORT" switch for disabling interlocks.

Figure 10. Front Panel Controls

This figure displays the front panel of the SSB-1 equipment, highlighting its various controls and indicators, updated to reflect Field Change IV. Key elements include: a PEAK MODULATION INDICATOR (meter), TRANSMITTER GAIN CONTROLS, a LOUDSPEAKER, a LOUDSPEAKER-HANDSET TRANSFER SWITCH, a LOCAL-REMOTE TRANSFER SWITCH, a CARRIER SWITCH, a CHANNEL SELECTOR, a RECEIVER GAIN CONTROL, a SPEECH CLARIFIER, OPERATING INSTRUCTIONS, POWER CONTROL SWITCHES, a LOCAL TELEPHONE HANDSET, a TELEGRAPH KEY JACK, and a TELEGRAPH-PHONE TRANSFER SWITCH.

Figure 16. Power Supply, Top View

This figure provides a top-down view of the power supply chassis, with various components labeled, updated to reflect Field Change IV. Visible components include vacuum tubes (V101, V102, V103, V104, V105, V106, V107, V108, V401, V402, E401), transformers (T101, T102, T103, T108), inductors (L101, L102, L103), capacitors (C101, C102, C103, C104, C130, C131), resistors (R107), fuses (F101, F102, F103, F104, F105), and terminal boards (TB102, TB103, TB105, J204, J205, J206, J207, J208, J209). A fuse shield is also indicated.

Figure 17. Power Supply, Bottom View

This figure shows the bottom view of the power supply chassis, revealing the underside wiring and components, updated to reflect Field Change IV. Key labeled components include various resistors (R101-R144), capacitors (C105-C129), transformers (T104, T105, T107, T108), inductors (L103), switches (S101, S102, S103, S106), relays (K101, K102), and terminal boards (TB101, TB201, TB202, TB203, TB204, TB205, TB206), along with rectifier Z101.

Figure 20. Transmitter-Receiver, Top View

This figure provides a top-down view of the Transmitter-Receiver chassis, with various components labeled, updated to reflect Field Change IV. Visible components include vacuum tubes (V201-V218, E201, E202, E203), transformers (T201-T206), inductors (L201-L221), capacitors (C204, C215, C224-C227, C234, C243, C248-C251, C272, C276), resistors (R201, R215, R225), mechanical filters (FL201, FL202), test points (TP201-TP205), and jacks (J201-J203). Ground posts and plastic shields are also indicated.

Figure 28. Power Supply Schematic

This schematic diagram illustrates the power supply and control circuits, updated to reflect Field Change IV. It shows the main power transformer T101, high voltage rectifiers V101 and V102 (5R4GY), low voltage rectifier V103, and various filament and plate voltage supplies. Key components include fuses (F101, F102, F103, F104, F105), capacitors (C101-C109, C111-C129), resistors (R101-R119, R123-R125, R127-R144), inductors (L101, L103), and switches (S101, S102, S103, S104, S105, S106, SW-101). It also details connections for the meter link, antenna, speech clipper, and various terminal boards (TB101, TB103, J204, J205, J206, J207, J208, J209). The diagram includes a "BATTLE SHORT" switch for disabling interlocks.

Temporary Correction T-5 (July 1959)

This correction applies to the Technical Manual for Single Sideband Radio Communication Equipment SSB-1 (NAVSHIPS 92917). It is effective only after Field Change 5-SSB-1 has been accomplished.

Field Change 5-SSB-1 aims to add a plate current meter in submarine installations.

The Technical Manual should be corrected with pen and ink. This correction should be inserted immediately after the front cover and preceding T-4.

Correction Table (T-5)

Page & Reference Symbol	Description
60, M 201	Meter, milliammeter DC type, meter reading 0-300 ma, sealed and ruggedized; type MR 26W-300 DC MAR Federal Stock Number N6625-553-8553.

This correction should be recorded on the RECORD OF CORRECTIONS MADE page.

This Technical Manual correction material was originally published as part of Field Change 5-SSB-1 which appeared in EIB 495, dated 19 September 1958.

Temporary Correction T-6 (February 1961)

This correction revises the manual to reflect equipment changes made by Field Change 6-SSB-1. The purpose of this field change is to increase sensitivity and maintain a more stable output. This field change applies to all SSB-1 units that have completed Field Changes 1 through 4.

When this change is included in the manual, the manual will cover the equipment as though Field Change 6-SSB-1 had been accomplished. This correction does not supersede any other corrections or changes.

Maintenance support activities should make this correction in the technical manual immediately.

Holders of equipment accompanied by technical manuals should not make this correction in the manual until accomplishment of the field change.

Make the following pen-and-ink corrections. Insert these temporary corrections in the technical manual in their appropriate columns.

Transmitter-Receiver Schematic, Pages 75, 76, 77 and 78; Figures 29 and 29B. Referring to temporary correction Figures 1 and 2, make the necessary pen-and-ink correction to the Transmitter-Receiver Schematics to conform with Field Change 6-SSB-1.
Parts List, Page 67, RCA Instruction Book, below S-201J, insert the following information:
Reference Designation Qty. Locating Function Name and Description Stock Number
S-201K 1 Receiver input shorting switch. Switch, wafer, rotator,: 5 position, Mfgr. Centralab, part/dwg. PS-283. N5930-636-2565
Parts List, Page 67, RCA Instruction Book, below S-201K, insert the following information:
Reference Designation Qty. Locating Function Name and Description Stock Number
S-201L 1 IPA coil shorting switch. Switch, wafer, rotator: 5 position, Mfgr. Centralab, part/dwg. PS-283. N5930-636-2565

Reference Designation	Qty.	Locating Function	Name and Description	Stock Number
S-201K	1	Receiver input shorting switch.	Switch, wafer, rotator,: 5 position, Mfgr. Centralab, part/dwg. PS-283.	N5930-636-2565

Reference Designation	Qty.	Locating Function	Name and Description	Stock Number
S-201L	1	IPA coil shorting switch.	Switch, wafer, rotator: 5 position, Mfgr. Centralab, part/dwg. PS-283.	N5930-636-2565

Figure 1. S-201 H Switch Wiring (Before and After Field Change)

This diagram illustrates the wiring of the S-201 H switch before and after Field Change 6. The switch has five terminals (labeled 1 through 5) and is connected to resistors (R-251, 270 ohms) and inductors (L-214, L-215, L-216, L-217). The "BEFORE FIELD CHANGE" configuration shows the switch connecting various inductor taps. The "AFTER FIELD CHANGE" configuration shows a modified wiring scheme, with terminal 5 now connected to the R.F. AMPLIFIER V211 6BA6, indicating a change in the signal path for improved sensitivity and stability.

Figure 2. S-201 D Switch Wiring (Before and After Field Change)

This diagram illustrates the wiring of the S-201 D switch before and after Field Change 6. The switch has five terminals (labeled 1 through 5) and is connected to capacitors (C-216, 1000 uuf; C-219, 22 uuf) and inductors (L-205, L-206, L-207, L-208, L-209). The "BEFORE FIELD CHANGE" configuration shows the switch connecting various inductor taps and a resistor (R-204, 1000 ohms) in series with L-209 (5MH). The "AFTER FIELD CHANGE" configuration shows a modified wiring scheme, with the S-201 L (REAR) switch also depicted, indicating changes to the coil shorting mechanism for improved performance.

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