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·v COMMONWEALTH OF AUSTRALIA
DEPARTMENT OF NATIONAL DEVELOPMENT
·BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS
No. 1965/133
~=;UR (.~~ ~F MINERAL RESOURCES
ij GEur HYSICAL LIBRARY t I Ref.m ••.• _ .. .J1 ......... "_ ............ _ ... .
REMOTE SEISMIC RECORDING SYSTEM
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. RESTRICTED This Record contains preliminary information only and is subject to amendment before final issue: It is intended for the private' use of tenement holders or authorities who can make immediate use of the.data and is not to be made available to anyone other than the original recipients without the Director's approval. The data after further review may be issued as an unrestricted Record.
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GEOi HYS; ~AL LIBRARY INTRODUCTION
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This system was designed to permit transmission of signals obtained from a seismometer installed at an observing station to a remote recording station. The low frequency signals are converted to frequency modulation, transmitted by telephone line, demodulated at the recording station, then recorded.
The seismometer coil movement is translated to an electrical signal of very low frequency which is amplified by a Phototube Amplifier. The output is taken to the input of the modulator which converts amplitude changes to frequencies around a centre frequency, which are then connected to the 600-ohm telephone line.
The received FM signal is fed to the demodulator, which reconverts it to amplitude variation in the form of a copy of the original seismometersienal. This signal is further amplified by the "Helicorder" recorder amplifier (which also provides the driving power), and is then recorded by the "Belicorder".
SEISM. PU. AMP. MOD. Line DEMOD. AMP. REC.
H H 600 ohm H H FM
0-10 0-10 1600 ±. 500 cis 0-10 0-10 cis cis cis cis
2. CIRCUIT DESCRIPTION
Modulator
to The
The input signal from the Photo tube Amplifier is fed the base of Ql across a 12.5K resistor and two limiting diodes. variable frequency oscillator consists of Q1 and Q2, of which Q2 is a Unijunction transistor.
The capacitor Cl is charged with a constant current proportional to the voltage at the base of Q1. i~en the voltage across C1 rises above the peak voltage of Q2, then Q2 will be turned on, providing a pulse at the resistor R6.
In the absence of signal, the rate of C1 charging, and hence the repetition firing frequency of ~2, will depend on the voltage at the base of ~1 and the voltage at which ~2 turns on. This centre or carrier frequency then will depend on the values of Rl, R2, R), R4, and e1, while the peak point of Q2 is for practical purposes a fixed ratio of the network supply volts (15 V).
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Hence, any linear change of voltage applied to the base of Q1 will result in a linear change of frequency around the centre frequency. The diodes CR1 and CR2 limit the input volts to + 0.6 V and so limit. the final frequency out to 1600~ 500 cis. The~centre frequency can be trimmed to 1600 cis by varying the above reSistors, but from the point of temperature stability sh~uld be done with stable capaci tors.
The actual centre frequency of the variable oscillator 1s . 3200 cis, but this is halved by a bistable multi~~or to r600 cis to be fed to the line. The signal is attenu~t8d Alld shaped, and fed to a matchinB amplifier driving the output transformer.
Demodulator
The input from the telephone line passes through the isolating transformer to an R C amplifier. (Note: although only one amplifier is shown here. it may be necessary to add more to trigger the Schmitt Trigger if line losses are high). The signal will then trigger the Schmitt Trigger circuit to reshape the wave back to a rectangular form. The adjustment R6 selects the triggering point, and once set. should not need resetting.
The reshaped signal is fed to a 'frigger Amplifier which, since it will not turn on until a voltage high enough to forward bias the diode is obtaine~, provides very sharp pulses. These pulses will trigger the Monostable multivibrator, which provides pulses of uniform width and height. These pulses are fed to an integrator circuit consisting of R23 and C9, driven by Q1. The choke L1, R25, and C10 form a filter for the very low frequencies which are the copies of the original seisrnomet'3r signa.l. The sit,'nals are then fed to the "Helicorder" amplifier.
Power supplies
The power supplies for the Modulator and the Demodulator are identical. The mains voltage 230V is transformed to 32V and fed to a bridge rectifier. The D.C. output is filtered and then regulated by a 15V Zener diode.
3. OPERATION
Set up the seismometer, amplifiers, and recorder as per their respective handbooks.
Observing Station
After setting up the seismometer and the Phototube Amplifier, join the connecting cable from the output of the Phase Amplifier to the input J2 of the Modulator. Connect the 230V cable to J11, and switch on.
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3.
If a eRO is available, check that the Modulator is working correctly by monitoring the output frequency at J1 with the seismometer disconnected. Connect the seismometer and check for frequency variation by gently tapping around the base of the seismometer. When the checks are made, connect the telephone line plug.
Receiving Station
Set up the "Helicorder" amplifier and the "Helicorder". Connect the telephone line to the correct plug. Connect the mains 230V cable to J11, and switch on. Set the "Helicorder" amplifier to maximum attenuation, and connect the output of the Demodulator from J2 to the input of the "Helicorder" amplifier. Signals from the observing station should now be observed.
If no signals are received, the attenuation should be decreased. If still no signals, and the Modulator system is known to be working, a CRO will be needed to monitor the circuit. Refer to the maintenance section.
Modulator
Demodulator
4. MAINTENANCE
1. Check mains voltage 230V.
2. Check regulated volts 15V.
3. Check centre frequencies
4. Apply a 1~ V battery with a 220-ohm resistor in series to J1-i and J1-2, then reverse leads. Approximate frequencies are f} = 1100 c/s and 1"2 = 2100 c/s.
5. Check that the Bistable Multivibrator is dividing the centre frequency of 3200 c/s to 1600 c/s. (Le. X2).
6. Check output is less than 250 mV r.m.s.
1. Check mains 230V and regulated 15V supplies.
2. Check that frequency can pass through the circuit.
3. Set R6 so that setting is between extreme limits.
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5. EXTRACTS FROM PMG PUBLICA'rION DATA TRANSMISSION
1'elephone Lines: Open Wire Physical
Long Distance
D.C. - 3 kC/s
300 - 3.4 kC/s
Technical Reglli~~nts
1. Maximum Power Output to be less than 1 mW in 600 ohms.
(a) Continuous tones (FM): To be less than -10 dbm.
(b) Discontinuous transmission: Less than -20 dbm.
2. No metallic or low impedance to be made from either line wire or associated equipment to earth.'
3. Receiving amplifier has sufficient gain only so that crosstalk is kart inaudible.
4. Protection:
(1) Wiring to be isolated and separated (in distance) from the wiring of the line. (BSS 415).
Rea.sonabla steps b:l.ken to avoid accidental contact with line wires. (Insulated covers and shrouded terminals).
(3) Power supply to enter equipment as far as possible from the entrance used for the telephone circui t.
(4) Terminals clearly marked to avoid wiring transposition.
5. Testing:
(1) Means of circuit isolation to be proviued to enable equipment to be disconnected from line for testing.
(2) PMC is responsible for the line and the facilities up to the isolating device.
(3) Subscriber to be responsible for equipment beyond the device.
(4) If equipment fails to meet PMG requirements, the isolating device MUST be operated.
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6. Transmission Llmits:
(1) AHc::uation Local 1 - 34 db • Trunk 6 - 40 db. :
(2) Trunk lineG (circults and losses) may vary greatly.
(3) Frequency translation up to 10 cis may occur on lone; lines.
(4) Noise wiE not Bxceed 2 mV in 600 ohms. above 4 kC/s).
(3 mV
( ~») AI::ylifiers: 1. Gain limited to render crosstalk unintelligi.ble.
2. No spurious oscillations must occur, irrespective of ~adDitude or an6le (!900 ) of the attachment to the line.
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