signal one CX-11 series A Operational Manual
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signal one CX-11 series A Operational Manual

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BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE
PHOENIX, ARIZONA 85021 * (602) 995-0608
BEFORE APPLYING POWER IT IS ABSOLUTELY ESSENTIAL TO
READ AND OBSERVE CLOSELY ALL INSTALLATION AND OPERATING
INSTRUCTIONS IN THIS MANUAL.
THE CX-11, SERIES A DIFFERS IN IMPORTANT RESPECTS FROM
OTHER TRANSCEIVERS.
POSSIBLE SERIOUS DAMAGE TO THE EQUIPMENT WHICH MAY
RESULT FROM FAILURE TO COMPLY WITH ALL INSTALLATION AND
OPERATING INSTRUCTIONS HEREIN WILL NOT BE COVERED BY
WARRANTY.
SIGNAL ONE CORPORATION
BLACK CANYON INDUSTRIAL PARK
8146 N. 23RD AVE.
PHOENIX, ARIZONA 85021
PRINTED IN U.S.A.
OPERATIONAL PROCEDURES
CX-11, SERIES A
HF SSB DELUXE INTEGRATED STATION
IMPORTANT
W 8 C X S R e v i s i o n

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  • Page 1 POSSIBLE SERIOUS DAMAGE TO THE EQUIPMENT WHICH MAY RESULT FROM FAILURE TO COMPLY WITH ALL INSTALLATION AND OPERATING INSTRUCTIONS HEREIN WILL NOT BE COVERED BY WARRANTY. SIGNAL ONE CORPORATION BLACK CANYON INDUSTRIAL PARK 8146 N. 23RD AVE. PHOENIX, ARIZONA 85021 PRINTED IN U.S.A.

  • Page 2: Table Of Contents

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 TABLE OF CONTENTS FORWARD..............4 SECTION 1 - CX-11A DESCRIPTION..........5 FEATURES AND SPECIFICATIONS ........6 PHOTO - FRONT ..........7 PHOTO - REAR ..........8 WARRANTY ..
  • Page 3 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 A27 ..TX FILTER SWITCH A28 ..COUNTER A29,A30 ..LED. READOUT A31 ..S-METER A33 ..TX/RX RELAY A34 ..MODE SWITCH BOARD A35 ..MODE SWITCH WAFER A36 ..MOTHER BOARD, TOP A37 ..MOTHER BOARD, BOTTOM FRONT PANEL INTERCONNECTION ........

  • Page 4: Forward

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 F o r w a r d T h e r e w e r e 1 1 1 S i g n a l / O n e C X - 1 1 A ’ s p r o d u c e d . A t o n e t i m e P a u l K o l l a r W 8 C X S k e p t a l i s t o f w h o o w n e d e a c h o n e .

  • Page 5: Section 1 - Cx-11A Description

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 S e c t i o n 1 C X - 1 1 A D e s c r i p t i o n W 8 C X S R e v i s i o n...

  • Page 6: Features And Specifications

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 F e a t u r e s a n d S p e c i f i c a t i o n s RECEIVING SYSTEM: FEATURES: ®...

  • Page 7: Photo - Front

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 PHOTO - FRONT W 8 C X S R e v i s i o n...

  • Page 8: Photo - Rear

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 PHOTO - REAR W 8 C X S R e v i s i o n...

  • Page 9: Warranty

    UNDER THE REGULATIONSOF THE MAGNUSON-MOSS WARRANTY ACT, THE SIGNAL/ONE WAR- RANTY POLICY IS CLASSIFIED AS A LIMITED WARRANTY. ALL SIGNAL ONE PRODUCTS MANUFACTURED IN THE UNITED STATES of AMERICA W 8 C X S R e v i s i o n...

  • Page 10: Section 2 - Operational Procedures

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 S e c t i o n 2 O p e r a t i o n a l P r o c e d u r e s W 8 C X S R e v i s i o n...

  • Page 11: Warning

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 WARNING LINEAR AMPLIFIER OPERATION The CX-11A external mercury reed relay has a contact rating of 25 VA max., 100 VDC max., 1 AMP max. switching current, and 2 AMP max. carry current rating. Linear Amplifier unprotected T/R relay coils can produce an inductive voltage kick as high as several thousand volts on relay opening.* The majority of Amateur Linear Amplifiers are not designed for...

  • Page 12: Basic Control Setup

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 BASIC CONTROL SETUP Control Setting Off (Button Out) Audio Filter Selectivity Keyer Any Position Sidetone Level Mid-Range Calibrate FSK Shift Mode USB or LSB Clipping TX Drive Slow TX Offset...
  • Page 13 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Check for the following conditions before energizing the radio: 1. Antenna connected to rear panel jack. 2. Fuses installed per rear panel markings. 3. Dummy plug installed in accessory jack (radio will not operate without plug).

  • Page 14: Explanation Of Control Functions

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Explanation Of Control Functions Note: All controls only associated with the receive function are marked with green lettering; transmit with red. Any controls which affect both receive and transmit are marked with yellow lettering.
  • Page 15 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 RX Shift a) The larger outer knob provides the operator with a means of moving the IF passband up or down relative to the “Zero-Beat” frequency. (Used for placing selectivity skirt at optimum point for rejecting interfering signals).
  • Page 16 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 quency about which a “notch or peak” is located is governed by the position of the “center frequency” knob. 15. Audio Selectivity Normally, this switch should remain in the 2.4 KHZ position. Narrower bandwidths down to only 100 HZ are provided to optimize the reception of weak signals in the presence of noise and/or strong interfering signals.
  • Page 17 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 23. Meter Pushbuttons Meter reads received signal strength during receive except when “P.A. VOLT” or “P.A. CUR.” buttons are depressed. a) P.A. VOLT: Press to monitor the power amplifier voltage. Note that signal strength indications cannot be observed with this function selected.
  • Page 18 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 26. A TX Offset Allows the operator to offset the transmit frequency as much as 3 KHZ with respect to the receive frequency when using VFO A for W 8 C X S R e v i s i o n...
  • Page 19 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Addendum to Item # 26 A TX Offset: A/T.O. CW Transceive Operation Depress A/T.O. Depress Spot Button and set A/T.O. offset control 800 Hz high in relation to receiver frequency displayed on digital counter.
  • Page 20 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 DETERMINING ACTUAL FORWARD AND REFLECTED POWER Table 1: METER INDICATION EQUIVALENT WATTS W 8 C X S R e v i s i o n...
  • Page 21 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 A TX Offset (cont'd.) both transmit and receive. Pressing the “A.T.O.” pushbutton activates this feature. The offset is observed directly in the readout either by actually transmitting or by depressing the spot button. At first, this may seem redundant in view of the fact that a similar offset fea- ture is included in receive (ref.

  • Page 22: Rear Panel Connections

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Rear Panel Connections W 8 C X S R e v i s i o n...
  • Page 23 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 REAR PANEL FUNCTIONS KEY: Hand key operation and key return for QSK operation. KEYER: Paddle key operation. J20: External PTT operation. (T/R) PATCH: Transmit audio input from external phone patch; 680 ohm imped- ance.
  • Page 24 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 16. RCVR: Separate receive antenna input as selected by AUX COM Switch. Use COM for normal transceive operation on one antenna. 17. GROUND: Use heavy copper for earth ground. 18.

  • Page 25: Section 3 - Final Test And Alignment Procedure

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 S e c t i o n 3 F i n a l T e s t a n d A l i g n m e n t P r o c e d u r e s W 8 C X S R e v i s i o n...
  • Page 26 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Install 10 amp fuse in the 110 volt AC line. Set switch on Brd.(A18) to 115 volts. Install 10 MHz clock on Brd.(A9). Install power and accessory plugs.
  • Page 27 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 L5 and C23 for maximum output at 34.2 MHz. Adjust C15 for +2 dBm ( .282 V. rms). Connect Coax 119. Install BFO in radio. Check Audio Output.
  • Page 28 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 just R2 on A31 (“S” Meter Brd.) until front panel red LED goes out. Adjust additional 60 degrees. 14. Synthesizer. Check for +15 volts on orange wire of synthesizer regu- lator.
  • Page 29 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 on Brd. (A7) for S1 reading. 21. VOLTAGE ON BIAS FEEDTHRU CAPACITOR. Check that there are 2.5 to 3 volts on the bias feedthru capacitor in receive in all modes. In SSB transmit only, there should be 24 volts.
  • Page 30 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 DRIVE or CLIPPING. Reconnect 400 Hz tone, power output will rise slightly. Look at the output with spectrum analyzer (300 hz resolu- tion and 1 KHz/div.) and check that the secondary sideband levels are 25 dB down.
  • Page 31 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 32. METER and FREQUENCY CONTROL FUNCTIONS. Use dummy load or antenna as necessary. METER FUNCTION 0 to 5 relative scale reading P.A. VOLT 2.4* P.A. CURRENT .2 idle.

  • Page 32: Section 4 - Cx-11A Modifications

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 cw, +3.5 V. With noise source on, the blanked out noise pulses will be present on the scope and vary smoothly as the noise blanker control is varied over its mid-range.
  • Page 33 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 S e c t i o n 4 C X - 1 1 A M o d i f i c a t i o n s W 8 C X S R e v i s i o n...
  • Page 34 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes Most drawings have many errors. Drawings were intended What is the S/ to partially cover the older CX-11 model, which had num- N scheme on bered wires.
  • Page 35 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes Slight frequency shift on one VFO when the other VFO is selected for transmit. R4 is too large to provide the required stiffness of the supply to the voltage balancing diodes. Change R4 from 1K ohms to 560 ohms - 1 watt to reduce the shift.
  • Page 36 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes A6 & As received, CW waveform has no break shaping with Since this straight key or external keyer. Change C6 (22µf) on A6 to depends on 47 µf or 60µf as needed to delay switching back to receive foil, connec-...
  • Page 37 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes Resistor R34 (22ohms - 1/4 watt) is in series with the exter- Select exact nal amplifier keying relay. Resistor may burn with some size using test linear amplifiers.

  • Page 38: A16

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes On early and late radios, the connections to J1, J2, J3 coax cables #131, 154, 174, are “Berg” connectors. These leak RF badly causing strong signals every 100 KHz with the Calibrate control off.
  • Page 39 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes Change R16 from 1 Meg to 1.5 Meg ohms for better drive meter operation. Change R5 from 10K to 18K Ohms to allow transmitter to work into a higher SWR load without exceeding the transistor ratings.
  • Page 40 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes To optimize power output vs frequency better: Change C-1 from 100 pf to 200 pf (Add second 100 pf chip capacitor on top of existing one); Change C-4 from 680 pf to 1680 pf (Add 1000 pf chip capacitor on top of existing C-4 - CAU- TION to use a thin capacitor due to clearance problems).
  • Page 41 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes (High Power) The modification to use the vacuum relay omitted connection of CR-1 (1N4003) across relay wind- ings to protect the switching transistor from spike damage. A foil cut and 2 jumpers are needed to connect CR-1.

  • Page 42: A26

    BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes Design error causes “1.5” position to rolloff at 800 Hz. Change R13, R14, R15 to 5.60K Ohms - R16, R17 to 7.87K Ohms, R18, R19, to 9.31K Ohms - C9 to .022150 µf - C10 to .003221 µf - C11 to low side of .022 µf - C20 to low side of .033 µf - C21 to .056440 µf.
  • Page 43 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes On early radios, R1, R2, R3, R4, R5, R6, R7, R8 were 1 watt composition type resistors. Late radios use 3 watt metal film type resistors for reliability. Tests Receive audio gain.
  • Page 44 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes Frequency readout accuracy is poor due to use of a non- adjustable 10 MHz I.C. oscillator (Dale XO-33A). Change this to the factory optional High Accuracy oscillator, A9A, board.
  • Page 45 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Board Notes In early radios, CR-16 and CR-17 were 1N456 diodes and R59 was 330 Ohms. This allowed some carrier on SSB to leak through. Late radios used PIN type diodes, MPN- 3500, for CR-16 and CR-17 and R59 was 1.2K Ohms to reduce the carrier leak.
  • Page 46 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 S e c t i o n 5 S c h e m a t i c a n d D r a w i n g s W 8 C X S R e v i s i o n...
  • Page 99 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Upper Chassis W 8 C X S R e v i s i o n...
  • Page 100 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Lower Chassis W 8 C X S R e v i s i o n...
  • Page 101 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 SIGNAL ROUTING, COAXIAL CABLE WIRE # Coax PTO A out to PTO Mixer Brd.(A 26). Coax PTO A out to Counter (A 28). Coax PTO B out to PTO Mixer Brd.(A 26). Coax PTO B out to Counter (A 28).
  • Page 102 BLACK CANYON INDUSTRIAL PARK * 8146 N. 23RD AVENUE PHOENIX, ARIZONA 85021 * (602) 995-0608 Coax RX Signal from RX Filter (A2) to Receive Mixer (A22). Coax Vox Gain Control to S1 TX Control Switch (AM. Coax input to Audio Gain Control from Selectivity Switch. Coax input to RX/Tx Relay (A33) from Antenna Switch.

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