FOX PRINTING PRESS
(T.U.)
637, Forest Road, London, E.17
ADVANCE SIGNAL
GENERATOR
Type E
Model 1
INSTRUCTIONS
ADVANCE COMPONENTS LIMITED
BACK ROAD, SHERNHALL STREET,
WALTHAMSTOW. LONDON, E.17
CIRCUIT CODE
R1 2200 ohms 1/4W 10% R12 180 ohms 1/4W 5%
R2 82 “ “ 5% R14 100 “ “ “
R3 750 “ “ “ R15 82 “ “ “
R4 91 “ “ “ R16 100,000 ohms 1/4W 10%
R5 750 “ “ “ R17 1000 ohms 1/4W 10%
R6 91 “ “ “ R18 27,000 “ “ “
R7 750 “ “ “ R19 1500 “ “ “
R8 91 “ “ “ R20 1000 “ “ “
R9 750 “ “ “ R22 100 “ “ “
R10 91 “ “ “ R23 750 “ “ “
R11 100 “ “ “ R24 3000 “ “ “
R13 91ohms wire-wound non-inductive Potentiometer.
R21 50,000 ohms carbon log law Potentiometer with switch.
C1. .01 mfd Mica C9. .05 mfd . paper tubular
C2 487 pf max. variable C10 4 mfd. electrolytic
C3 30 pf. ceramic C11 4 mfd. electrolytic
C4 .005 mfd. mica C12 .001 mfd. mica
C5 .005 mfd. mica C13 .005 mfd. mica
C6 40 pf. ceramic C14 .005 mfd. mica
C7 .005 mfd. mica C15 .005 mfd. mica
C8 .001 mfd. mica C16 .005 mfd. mica
S1.A) Ganged wavechange S2 CW or Mod.
S1.B) S3 Mains switch on R21
L1) Coil pack L5. L.T. choke
L2) L6. L.T. choke
L3. R.F. choke L7. Mains filter choke
L4. R.F. choke
T1 Modulation transformer T2. Power transformer
This Service Oscillator, with its wide frequency range and accurate attenuator system. will enable measurements on selectivity and sensitivity to be made on radio and television receivers with a degree of accuracy sufficient for all practical purposes. The frequency range covers 100 Kc-60Mcs., thus embracing the television bands on fundamentals, and by using harmonics the range can be extended to 120 Mcs to take care of any future developments.
INSTALLATION NOTES
The instrument is shipped with all valves in position and the mains transformer adjusted to 230 volts. When used on any other voltage 110-210-230-250, the circular disc on the back of the case must be removed and the appropriate adjustment made on the voltage panel of the mains transformer (see notes on maintenance). The instrument is suitable ONLY for A.C. supplies having a frequency between 40 and 100 cycles.
The following valves and accessories are supplied with each instrument:-
I Valve type EF5O Mullard or Sylvania.
I Valve type 6J5SG.
1 Valve type 6XSG.
I Pilot lamp type MES 11 mm 6.5 volt.
I Termination Pad and Dummy Aerial type T.P.1.
1 Shielded R.F. lead. type PL.21. complete with plugs and socket.
1 A.F. Lead, type PL.22. complete with plug and crocodile clips.
MODULATION
The top right hand switch selects C.W. or modulation. When in the "MOD" position, the carrier output is modulated 30% at 400 cycles.
FULL R.F.
At the "Full R.F." socket the output is approximately 1 volt, and is not controlled by the attenuators. There is a slight change in the frequency calibration when using this socket. The output impedance is about 50 ohms. if the full I volt output is required the load should not be less than 500 ohms.
R.F. ATTENUATORS
The R.F. output at the socket marked "ATTEN R.F." is controlled by two attenuators. The output from the R.F. oscillator section is fed into a non-inductive potentiometer marked "VOLTAGE OUTPUT" and calibrated 0-10. The output from this is fed into a 5 step attenuator marked "MULTIPLIER" and calibrated X1, Xl0, X100 microvolts and X1, X10 millivolts. The output is, therefore, continuously variable from 1.0 µV to 100 mV. The output impedance is as follows
Step X1 uV 75 ohms
X10 uV ...
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