Signal/One Newsletters

[1975] [1976] [1977]

Following are the S/1 Newsletters. These newsletters were produced by Bob Sullivan, W0YVA. They have been scanned in as I have them. Please note that some of the information contained in these newsletters is incorrect. Please check any modifications before implementing them.

1975

Volume 1, Number 1

CX7 Parts - Payne Radio
Power Supply Boards
Checking MOSFETS in circuits
Modifications for using preselector
Modifications to improve AGC action
Adjusting R46 (8.8 MHz) without frequency counter
Volume 1, Number 2

Front Panel pushbutton engraving
LED readout boards - availability
40673 substitute
Installing Johnson power supply "B" board
Correction to checking MOSFETS (NO. 1)
Modification for increased audio output
Volume 1, Number 3

Serial number information
LED counter boards from K0HHP
Adjusting R46 (8.8 MHz) with a BC221
CX-11 information from Franklin Lages
Repairing PTO backlash
Volume 1, Number 4

Receiver incremental tuning without modifications
Elininating frequency shifts when switching from VFO A to B
K0HHP power supply modifications (step-by-step)
AGC modification
Transmit mode lockup repair hint
Push-buttons from Don Payne
B5750 nixie sources
Power supply notes
Volume 1, Number 5

Net information
Replacement power transformers from Johnson
Another nixie tube source
K0HHP power supply schematic
Repair service information - Larry Pace
Adjusting R46 (8.8 MHz) with no equipment
Caution note on Johnson power supply board
Modification to add sidetone PITCH (CW) control
Volume 1, Number 6

Substitute transistor information
Using ALC with A77 linears
8072 socket modification
Receiver intermittent repari hint
Volume 1, Number 7

More transistor substitutions
Modification to protect 8072
RTTY modifications by W4FQM/1
Another hint on repairing PTO backlash
Motorola IC error correction
Modification to prevent reed relay sticking
Modification to prevent AGC pumping action
Installation of MFJ audio filter
Volume 1, Number 8

Corrections for transistor substitute listings
Modification to utilize LM380 audio IC
Technical manual corrections
Zener diode change for CX7A power supply board
Modification to use AGC with A77 linears
A77 modifications - general
Volume 1, Number 9

Installing MFJ audio (CW) filter
CX7A modifications by W8CXS
Curing instability in the 43.1 MHz oscillator
Volume 1, Number 10

Correction to modification concerning .01uf to replace driver
CX-11 information via Reston
RTTY modifications
Information concerning spurious emissions by W2GRU
Instructions for installation of CX7B power supply board
Volume 1, Number 11

Repairs by K6BE
AUTEK research audio filter information
PA237 replacement
Reed relay information
Capacitor replacement to prevent RF driver board damage
Keyer modification by W8CXS
Schematic of CX7B power supply board
Volume 1, Number 12

More info on capacitor replacement to prevent RF driver board damage
Modification to eliminate images when in A/TO mode
More backlash information

1976

Volume 2, Number 1

Feedback from W8CXS on his keyer modification
Using a 80-meter dipole on 160
Complete INDEX for Volume 1, 1975
Volume 2, Number 2

LED counter boards from K0HHP
Repair hint for noisy audio
Repair hints for lock-up and hang-up in the XMIT mode
Caution concerning switching from BROADBAND to MANUAL
Mounting TRW PT3657's for use as replacements for RF drivers
Volume 2, Number 3

Backissues from K2GI
Nixie tubes from B&F Enterprises
RIT modification by W7IV - Step-by-step
Replacement information for 2N5485
Sidetone volume circuit modification
Volume 2, Number 4

LED counter boards from K0HHP
CX11 information
8072 power supply complete schematic
Availability of 8072's
Volume 2, Number 5

Defective 8072 socket problem
RIT modifications (2)
Cleaning lubricant off PTO lead screws
ALPHA amplifier operation with CX7 (increase efficiency)
Reducing range of OFFSET potentiometer
Volume 2, Number 6

Modifications to eliminate frequency shift when switching PTO's
Information concerning the W7BBX programmable keyer
Heathkit HD-1410 keyer modifications to cure RF problems
Volume 2, Number 7

Repairs by K6BE
RIT modifications by K6BE (passive)
Hint while leaving the CX7 energized at all times
Differences between original manual and Thomas manual
Replacement information for the RF drivers (Q3 and Q4)
VFO oscillation
Low band DX antenna by WA4TLB
Volume 2, Number 8

Oscillation on 20 meters - cure
W7BBX contest keyer modification
CX11 information
Volume 2, Number 9

Synthesizer information by W7IV - prelim modifications
K0HHP counter board modification to select 100 or 10 Hz
Low audio and no RF output - cause and cure
Replacement for TIP29A's and TIP30A's
Index for Volume II, Numbers 1 through 6
Volume 2, Number 10

More transistor substitutions
Cure for Autek QF-1 filter feedback with CX7
Mounting driver transistors, Q3, Q4
Repairs by K6BE/5
RIT and High power protection mods by K6BE/5
Volume 2, Number 11

Comments concerning digital display by K2SIL/1
Cure for intermittant loss of 8072 bias
CX11 photographs
Volume 2, Number 12

CX11 performance by W0AM
Autek Audio filter hint
CX11 performance by W0NVE
Receiver insensitive on 20 meters - cause and cure
No readings in screen and drive - cause and cure
No clipping indication on weak signals - cause and cure
Poor sensitivity on weak signals - cause and cure
No VOX operation - cause and cure