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BC221 BC-221 Frequency
Meter Sets SCR211
SCR-211-A-B-C-D-E-F-J-K-L-M-N-O-P-Q-R-T
AA AC AE AF AG
AH AJ AK AL
TM 11-300
BC-221-A BC-221-B BC-221-C BC-221-D BC-221-E BC-221-F BC-221-J BC-221-K
BC-221-L
BC-221-M BC-221-N BC-221-O BC-221-P BC-221-Q BC-221-R BC-221-T BC-221-AA
BC-221-AC
BC-221-AE BC-221-AF BC-221-AG BC-221-AH BC-221-AJ BC-221-AK BC-221-AL
SCR-211-A SCR-211-B SCR-211-C SCR-211-D
SCR-211-E SCR-211-F SCR-211-J SCR-211-K SCR-211-L
SCR-211-M SCR-211-N SCR-211-O SCR-211-P SCR-211-Q SCR-211-R SCR-211-T
SCR-211-AA SCR-211-AC
SCR-211-AE SCR-211-AF SCR-211-AG SCR-211-AH SCR-211-AJ SCR-211-AK
SCR-211-AL
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The BC-221 heterodyne frequency meter
Comprises a dual-range VFO, a crystal controlled 1MHz oscillator, a mixer
and AF amplifier.
Ranges of the VFO fundamental are 125kHz to 250kHz and
2MHz to 4MHz.
Both oscillators generate outputs rich in harmonics so that
the instrument can be used well above its maximum design frequency of
20MHz.
When complete with headphones, spares, tools and batteries, as
originally supplied, the equipment was designated SCR-211-(&) where
(&) was a one or two-letter suffix.
The BC-221 is housed in either
black-wrinkle finished aluminium alloy or matt-olive wooden cabinet.
Wooden-cased models were
supplied with a khaki clip-on canvas cover that attached to the case with
press-studs; metal-cased models with a padded carrying bag.
Power was
supplied either from batteries or a mains power supply in a lower
compartment accessible from the rear of the cabinet. Models B and Q were
supplied with a battery tray.
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In the UK the majority of mains power
supplies were manufactured separately for the Ministry of Aviation during
WW2.
A spare crystal was kept on the chassis itself in many models.
Tools
inc. one or two Bristo wrenches (Nos.6 and/ or 8)
These resemble Allen
keys, but are fluted rather than flatted.
The control panel itself is covered
when not in use by a hinged lid that contains the units Calibration Book.
Each BC-221 was individually calibrated and the calibration book marked
with the serial number of the unit.
The serial number is given on a metal
or bakelite plate on the control panel and on the control-panel lid of
metal-cased models. It can sometimes also be found stamped in paint on the
units chassis.
Some metal-cased models had an Antenna terminal on the
left-rear of the top of the case.
All wooden-cased models have their
Antenna and Ground terminals on the front panel. |
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Frequency Meter BC-221 Set SCR-211
Was designed to provide a simple, accurate, and reliable crystal calibrated frequency indicating equipment for use in both the laboratory and in the field.
Since it is completely portable and self-contained, it
was particularly adaptable for adjusting aircraft radio transmitters and radio receivers to any desired frequency in the range from 125 to 20,000 kcs.
COMPONENTS.
Each Frequency Meter Set SCR-211, as furnished , consists of the following component units:
Frequency Meter BC-221; size over all; height 13.13”, width
10.13”, depth 9.44”;
Includes:
1 Frequency Meter BC-221 Chassis (wired)
1 Crystal Unit DC-9 (in operating position)
1 Calibration Book MC-177 (inside front door)
1 Wrench for Bristo 6 Set Screw (spare parts compartment)
1 Wrench for Bristo 8 Set Screw (spare parts compartment)
2 Sets of Vacuum Tubes (one set in service and one set in spare parts compartment)
Instruction Book for Frequency Meter Set SCR-211
Bag BG-81-D
Additional Spare Set of Vacuum Tubes (Packed in battery compartment)
Strap ST-19-A
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Manual
Circuits and
Layouts Available
Plus Additional Articles
Details Below
As a Download
Click Here |
| The Manual Consists
of the Following
General information and instructions
Description
Introduction
General
Frequency setting error
Components
Replaceable parts
Power consumption
Installation and operation
Initial procedure
Installation of batteries
Antenna
Headset
Reading the dial
Calibration Book MC-177-(&)
Operating circuits
Zero beat detection
Correction in calibration
Crystal check points
Frequency measurements
Precautions during operation
Adjustments for field upkeep
Functioning of parts
General
Circuit components
Crystal Circuit
Variable frequency oscillator circuit
Detector tube circuit
Audio amplifying circuit
Maintenance
General instructions
Circuit trouble
Moisture proofing and fungi proofing
Supplementary data
General
Frequency Meter Sets SCR-211-A, SCR-211-C, and SCR-211-D.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Sets SCR-211-B and SCR-211-Q.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Set SCR-211-E.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Sets SCR-21-1-F, SCR-211-J, SCR-211-K, and SCR-211-L.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Sets SCR-211-M, SCR-211-O, SCR-211-R, and SCR-211-AC.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Sets SCR-211-N, and SCR-211-AA.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Sets SCR-211-P, SCR-211-T, SCR-211-AF, and SCR-211-AH.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Sets SCR-211-AE, and SCR-211-AG.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Set SCR-211-AK.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
Frequency Meter Sets SCR-211-AJ, and SCR-211-AL.
Description
Installation and operation
Functioning of parts
Maintenance
Supplementary data
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Manual
Circuits and
Layouts Available
Plus Additional Articles
Details Below
As a Download
Click Here |
BC221
BC-221 Frequency Meter SCR211
SCR-211-A-B-C-D-E-F-J-K-L-M-N-O-P-Q-R-T
AA AC AE AF AG AH AJ AK AL
TM 11-300
Manuals are Available
Worldwide as
a Download.
BC-221-A BC-221-B BC-221-C BC-221-D BC-221-E BC-221-F BC-221-J BC-221-K
BC-221-L
BC-221-M BC-221-N BC-221-O BC-221-P BC-221-Q BC-221-R BC-221-T BC-221-AA
BC-221-AC
BC-221-AE BC-221-AF BC-221-AG BC-221-AH BC-221-AJ BC-221-AK BC-221-AL
SCR-211-A SCR-211-B SCR-211-C SCR-211-D
SCR-211-E SCR-211-F SCR-211-J SCR-211-K SCR-211-L
SCR-211-M SCR-211-N SCR-211-O SCR-211-P SCR-211-Q SCR-211-R SCR-211-T
SCR-211-AA SCR-211-AC
SCR-211-AE SCR-211-AF SCR-211-AG SCR-211-AH SCR-211-AJ SCR-211-AK
SCR-211-AL
Technical Installation & Operation Manual
with
Circuits and Layouts Covering all above models
Manual 180 A4 pages worldwide
Or the Manual
with
Circuits and Layouts Covering just the BC221 M
SCR-211-M model
Manual 38 A4 pages worldwide
Or the Manual
with
Circuits and Layouts Covering just the BC221
P & BC221 T
SCR-211 P SCR-221-T model
Manual 42 A4 pages worldwide
Mains Power Supply
"Rectifier Power Unit RA-133 TM 11-300"
Technical Bulletin
with
Circuits and Layouts Covering the models listed below.
BC-221-B
BC-221-M BC-221-N BC-221-O BC-221-P BC-221-Q BC-221-R BC-221-T BC-221-AA
BC-221-AC
BC-221-AE BC-221-AF BC-221-AG BC-221-AH BC-221-AJ BC-221-AK BC-221-AL
BC-221-AN
SCR-211-A SCR-211-B SCR-211-C SCR-211-D
SCR-211-E SCR-211-F SCR-211-J SCR-211-K SCR-211-L
SCR-211-M SCR-211-N SCR-211-O SCR-211-P SCR-211-Q SCR-211-R SCR-211-T
SCR-211-AA SCR-211-AC
SCR-211-AE SCR-211-AF SCR-211-AG SCR-211-AH SCR-211-AJ SCR-211-AK
SCR-211-AL SCR-211-AN
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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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