This is a superheterodyne receiver with low frequency coverage from 60 to 420 KHz and medium/high frequency coverage of 500 KHz to 30 MHz. The IF passband can be varied from 6000 Hz to 100 Hz. CR100 receivers designed to British Admiraly specs were given Bxx designators,
Power input - 200/250 VAC, 50 Hz @ 85 watts or 6volt nd 160VDC.
Weight - 82 pounds.
Dimensions in inches - 16W x 16.5D x 12.5H
Vintage: First version 1940. Fred Osternam's book shows 1944 to1945 for CR100/7 series..
EQUIVALENT SERVICE TYPE NUMBERS FOR MARCONI CR100 SERIES OF RECEIVERS
Marconi Service Type Patt. No Details
Type No. No.
CR100 --- --- Prototype. Low phone level. Used "B" gauge phone jacks.
3 ohm loud speaker.
CR100/1 B28 W2835 Admiralty. Pattern High phone level. "A" gauge phone jacks. (A.P
. 676). 1,000 ohms loudspeaker. Circa 1940
CR100/2 R1297 --- Army, RAF and other services. As CR100 but with coaxial plug and
(RAF) socket fittings for aerial input and with side tone facility.
CR100/3 --- --- Superseded by CR100/5
CR100/4 B28 W2835A As W2835 but fitted with scale clamping device and body guard.
CR100/5 B28 W2835B As Patt. W2835 but with coaxial plug and socket fittings for aerial
input and improved rear terminal board.
CR100/6 B35 W8126 Admiralty. For use with other apparatus to comprise Tuner
Amplifier B.35. Special input circuits and modifications for direction
CR100/7 B28 W2835D As Patt. W2835A but with noise limiter Admiralty Patt. 56703 and
additional IF output jack.
CR100/8 B28 W2835E As Patt. W2835B but with noise limiter Admiralty Patt. 56703.
CR100/8 --- --- Ministry of Supply. As CR100/8 except 3 ohm loudspeaker and B"
gauge phone jacks.
|Internal view of CR100 receiver (Photo by Jason Ingraham, VE1PYE)|
Contributors and Credits:
1) Marconi Manual T1868
2) Jason Ingraham, VE1PYE <the_doctor31(at)hotmail.com>
3) Shortwave Receivers Past & Present Communications Receivers 1942-1997 by Fred Osterman.
4) Sandy Blaize ebjr37(at)charter.net