G. F. 22
Inside Sheet
HONG KONG
INDENT No:-...
Item
Quantity.
No.
LO
5
1
6
77
1
H
PAGE...3
Estimated Cost in England.
Description of Articles.
Total.
Rate.
£. S.
d.
RECTIFIER for Master Oscilla-
tor filament battery charging, to deliver 15 amps. at 6/10 volts.
RECTIFIER for station D.C. supplies for keying and pro- tecting circuits, to deliver 3 amps. at 110 volts.
TRANSMITTING PLANT
SHORT WAVE TELEGRAPH
TRANSMITTER UNIT, Type S.W.B.4B for transmission on four spot waves in harmonic relation to be selected between 9.5 and 130 metres, with provision of coils for doubling or trebling the fundamental frequency, pri sing screened framework mounting the following circuits:
a. Third Amplifier Unit with
cam
aerial and closed circuits, indicating instruments and detail parts for the ampli- fication of short wave C.W. o scillations, with moun tings for two M.T.9F valves.
b.Second Amplifier with mount-
ing for one M.T.9F valve, with oscillating circuit, indicating instruments and detail parts.
c.First Amplifier Unit, mount-
ing one M.T.12 valve with oscillating circuit, indi- cating instrumen ts and detail parts.
→
d. Constant Frequency Drive Unit in screened case, comprising master oscil- lator valve, multiplying
Carried Forward......
26
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