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Marconi B28 Receiver
CR100 CR100/1 CR100/2 RAF 1297
CR100/3 CR100/4 CR100/5 CR100/6 CR100/7
CR100/8 RX
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Circuit Diagram, Service
Manual, Service
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The Marconi CR100 B28
A self - contained Communications Receiver of super heterodyne type with AVC for use on
CW or Phone reception.
As with other versatile equipment of the
Forties, the CR100 was subject to a number of variations, most of them
minor in specification, to suit particular Service needs.
Basic
Circuit :-
Two RF amplifiers, both KTW62 or 6K7G.
Mixer -
X66 or 6K8G.
Local oscillator - KTW62 or 6K7G.
IF amplifier-
three KTW62 or 6K7G.
CW oscillator - KTW62 or 6K7G. |
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Detector agc and audio amplifier
- DH63 or 6Q7G.
Output - KT63 or 6V6G.
Mains rectifier - U50
or 5Y3G.
Frequency Range :-
60
kc/s to 420 kc/s and 500 kc/s to 30 Mc/s in 6 bands.
Band1:- 60 to
160 Hz.
Band 2:- 160 to 420 kHz.
Band 3:- 500 to 1400 kHz.
Band
4:- 1400 to 4000 kHz.
Band 5:- 4000 to 11000v kHz.
Band 6:-
11000 to 30000 kHz.
Power Supply :-
A built in 200 - 250 volt
AC power unit is positioned at the rear right of the chassis, sensibly
remote from the tuned circuits.
Consumption is 85 watts. |
Manual and
Circuit
available
Details Below
As a Download
Click Here |
Receiver Output :-
Loudspeaker
(3 ohms or 1000 ohms) 2 watts maximum.
Line (600
ohms) of the order of 2mW.
Phones (high or low resistance)
depending on impedance of Phones and Receiver Edition.
Modified Editions
A
number of Editions existed carrying modifications to suit the needs of
various Services, the principal models being : -
CR100 CR100/1 CR100/2 RAF 1297 CR100/3 CR100/4 CR100/5 CR100/6 CR100/7 CR100/8
Mod.
Weight
82 lbs |
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PCR100 Prototype.
Low phone level. "B" gauge phone jacks.
3 ohm loud speaker.
CR100/1 B28 W2835 Admiralty.
High phone level. "A" gauge phone jacks. (A.P. 676).
1,000 ohms loudspeaker.
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CR100/3 Superseded by CR100/5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 finding.
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.
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Manual and
Circuit
available
Details Below
As a Download
Click Here |
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The Marconi B28 CR100
Receiver Manual covers the following models
CR100 CR100/1 CR100/2 RAF 1297 CR100/3 CR100/4 CR100/5 CR100/6 CR100/7 CR100/8
Manuals are Available
Worldwide as
a Download.
Manual including all circuits &
layouts 82 A4 pages worldwide
( For all Payment Options )
( Please Click the Payment Links Below )
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We do all we can to provide
the very best that is available for you.
But in the unlikely event that any data should not be as you expected.
A refund is always available. Kind Regards Allen and Alanna. |
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