SQUIRES-SANDERS SS-1T - SS-1TF

Nella edizione di Marzo 1964 di QST (rivista americana dei radioamatori), venne annunciato, in uno spazio
pubblicitario per la Squires-Sanders, che a breve sarebbe stato disponibile il trasmettitore SS-1T da accoppiare
al ricevitore SS-1R. Ma come molti appassionati di questa casa costruttrice sapranno ciò non avvenne.
Voci di corridoio dicono che "qualche" prototipo (forse uno soltanto) fu costruito ma mai commercializzato per un problema
di progettazione in uno degli stadi del trasmettitore. Il tempo passava ma il problema non veniva risolto,
di conseguenza il progetto venne abbandonato. Che fine hanno fatto quei prototipi? E' mistero.
Qui sotto ci sono le specifiche preliminari del trasmettitore SS-1T e del suo VFO separato, SS-1TF.
Le ho ricopiate da un documento originale Squires-Sanders.


In the March 1964 edition of QST (American radio amateur magazine) it was announced, in an advertizing space
of Squires-Sanders, that soon it would be available the SS-1T transmitter to be coupled to the SS-1R receiver.
But like many enthusiast of this manufacturer know, this did not happen. Rumors say that
"some" prototypes were built (maybe one only) but never marketed due to a design issue in one of the stages of the
transmitter. Time passed but the problem was not resolved, so the project was abandoned.
What happened to these prototypes? It's a mystery. Here below are the preliminary specifications
 of the SS-1T transmitter and its separate VFO, SS-1TF.
I have copied them from an original Squires-Sanders document.
 

 

 


 

PRELIMINARY DATA June 1964

 

SS-1T/SS-1TF DATA SHEET

 

SS-1T the matching transmitter for SS-1R Receiver, is designed for transceive mode operation with SS-1R receiver frequency control.
SS-1T will operate at 200 watts PEP input and will embody unusual Squires-Sanders developments which provide operating features not available in similar equipment. For those operators who prefer separate receiver/transmit frequency control, the separate transmit frequency unit (SS-1TF) will be available.
 

FEATURES

Operates all modes USB, LSB, DSB, AM and CW
SS Booster (SSB Speech Clipper) built in
Continuous operation at rated power
Transistor electronically regulated high (P.A. Plate) voltage supply
Built-in sidetone and test-tone oscillator
Operates transceive mode with SS-1R or independently with SS-1TF
One package (Built-in power supply)
Grain oriented steel power transformers
RF Relative Power Output meter
RF envelope feedback (improved linearity)
ALC “flat-topping” protection
 

SS-1T SPECIFICATIONS

 Frequency Coverage: 80, 40, 20, 15 and 10 Meter Amateur Bands

Modes and Power Rating: (All rating are for continuous operation)

MODES                     PLATE POWER INPUT            POWER OUTPUT

   1- SSB*                       200 watts PEP                        130 watts PEP
                         (either sideband)           (two tone)                                                                       

  2- DSB                        200 watts PEP                        130 watts PEP
(single tone)

       3-  AM                          90 watts carrier                     35 watts carrier

       4-  CW                        200 watts carrier                   140 watts carrier

 

*VOX or PTT in SSB mode

Microphone: High impedance

RF Output Impedance:  50Ω (SWR not to exceed 2:1)

Frequency Stability: Less than 500 cps drift from cold start. Typical warm-up time is less than 5 minutes.
 Less than 100 cps frequency change thereafter with 105 to 125 V line voltage variation.

Frequency Accuracy: +/- 1 kc. maximum error

Keying: Grid blocked, full break-in, uses VOX delay

Audio Frequency Response: +/- 6 dB  300--2300 CPS

Carrier Suppression:

1- SSB  60 dB

2- DSB 50 dB

Unwanted Sideband:  50 dB below output signal

Oscillator or Mixer Products:  50 dB below output signal

Second Harmonic:  40 dB below output signal

Third Order Distortion:  30 dB below output signal

Front Panel Controls

P.A. Plate Tuning

P.A. Load Tuning

Exciter Tuning

Carrier Level

Bandswitch

Function:  CW/SSB -VOX/SSB-PTT/DSB-AM

VOX Delay

VOX Gain

Test Tone Level

Mic Gain

Peak Clip Set

PWR ON/Meter  RF Meter Grid

Metering

Relative RF Output

Plate Current

Grid Current Indicator

SSB Speech Clipping:

Adjustable 0 to 20 dB Clipping depth

Size and Weight:

7-3/4" High x 16-1/4" Wide x 13" Deep, 33 Pounds
 

SS-1TF SPECIFICATIONS

Provides independent frequency control with SS-1T

Frequency coverage, stability, accuracy, digital readout and motor

tuning specifications are the same as for the SS-1R.

1-  Features:  (besides above)

a-  Matching cabinet and styling

b-  Switchable XMTR/RCVR Frequency control

c-  "Spotting" SW provided (spot XMTR frequency W/O putting XMTR "On-the-Air")

d-  Full "Cross-mode" operation: RCV any mode/XMT any mode,

including cross-band operation (when on XMTR frequency control)

e-  All power provided by SS-1T

f-  SS-1TF dial lights when in XMTR frequency control, so no confusion can result

g-  Full amateur band coverage (per SS-1R); (28.5 -- 29.0 provided normally)

 

 

 

FROM AN ORIGINAL SQUIRES-SANDERS DOCUMENT                                                                                                           www.radiopharos.one

 


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