Difference between revisions of "BC-611"
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| − | [[File:BC-611 8752987574 l.jpg|right]]Radio Set SCR-536 is a very compact receiver - transmitter resembling an oversize telephone hand set. Complete with batteries, antenna, transmitter, receiver - and handset in one case. The BC-611 is a handheld radio commonly known as the first " | + | [[File:BC-611 8752987574 l.jpg|right]]Radio Set SCR-536 is a very compact receiver - transmitter resembling an oversize telephone hand set. Complete with batteries, antenna, transmitter, receiver - and handset in one case. The BC-611 is a handheld radio commonly known as the first "Handi Talkie" |
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==Tuning== | ==Tuning== | ||
Tuning is accomplished by means of two separate crystals an antenna coil, and a tank coil. The receive crystal frequencies are 455 kHz above the desired frequency. for example a crystal frequency of 4340 will give you a receive frequency of 3885 kHz. Often the receive crystals for the BC-611 will have the crystal frequency on the front and the actual receive frequency on the back. | Tuning is accomplished by means of two separate crystals an antenna coil, and a tank coil. The receive crystal frequencies are 455 kHz above the desired frequency. for example a crystal frequency of 4340 will give you a receive frequency of 3885 kHz. Often the receive crystals for the BC-611 will have the crystal frequency on the front and the actual receive frequency on the back. | ||
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| + | [[File:BC-611-All_Components.jpg|400px]] | ||
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[[File:BC-611-Crystals.jpg|400px]] | [[File:BC-611-Crystals.jpg|400px]] | ||
| − | BC-611 receive crystals show the crystal frequency and the receive frequency on the back | + | BC-611 receive crystals show the crystal frequency on the front and the receive frequency on the back (Only one crystal is needed in the radio. Two are shown to detail the front and back) |
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| + | [[File:BC-611-TX_Crystal.jpg|400px]] | ||
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| + | Transmit Crystal is marked with the primary frequency only, the above crystal is Transmit frequency of 3245 kHz. There is also a Tank Coil that is matched to the Crystal (These crystals are not matched to the above Receive crystals) | ||
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Tuning Coil | Tuning Coil | ||
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==MWO (Maintenance Work Orders== | ==MWO (Maintenance Work Orders== | ||
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:Authorizes the necessary drilling of the bottom cover assembly to mount an external headset jack for use of Headset [[HS-30|HS-30-( )]] in connection with the Homing Modification Kit MC-619 (25 January 1945) | :Authorizes the necessary drilling of the bottom cover assembly to mount an external headset jack for use of Headset [[HS-30|HS-30-( )]] in connection with the Homing Modification Kit MC-619 (25 January 1945) | ||
;MWO SIG 11-235-6 | ;MWO SIG 11-235-6 | ||
| − | : | + | :Repeats MWO SIG 11-235-3 and adds MC-162 to the earphone and M-367 to the microphone caps for hot weather breakage and cold weather personnel protection. (1 April 1945) |
;MWO SIG 11-235-7 | ;MWO SIG 11-235-7 | ||
| − | : | + | :Added copper wire ground buss between all socket ground plates |
| + | ;MWO SIG 11-235-8 | ||
| + | :Adds a metal clip to the bakelite ON/OFF switch on the antenna bottom section. | ||
==Related Files== | ==Related Files== | ||
Latest revision as of 16:44, 17 July 2017
Radio Set SCR-536 is a very compact receiver - transmitter resembling an oversize telephone hand set. Complete with batteries, antenna, transmitter, receiver - and handset in one case. The BC-611 is a handheld radio commonly known as the first "Handi Talkie"
Contents
Specifications
- Frequency Range
- 3.5 - 6.0 mHz
- Modulation Type
- AM
- Number of Crystals
- One transmitter and one receiving crystal required per channel
- Preset Frequencies
- One preset Channel Provided
- Antenna
- 44 Inch whip antenna - telescopes into set box, receiver is turned on when the antenna is extended
- Tuning
- Crystal
- Power Source
- Self contained dry batteries
- Power Output
- .027 Watts
Images
Removal From the Case
To remove the circuits from the case for service"
- Open the bottom cover
- Unplug the mic and speaker wires
- Unscrew the top screw
- Pull the radio out from the bottom.
Reinstallation in the Case
When reinserting the radio into the case, take care to align the radio on the guide slots. (see images below)
Tuning
Tuning is accomplished by means of two separate crystals an antenna coil, and a tank coil. The receive crystal frequencies are 455 kHz above the desired frequency. for example a crystal frequency of 4340 will give you a receive frequency of 3885 kHz. Often the receive crystals for the BC-611 will have the crystal frequency on the front and the actual receive frequency on the back.
BC-611 receive crystals show the crystal frequency on the front and the receive frequency on the back (Only one crystal is needed in the radio. Two are shown to detail the front and back)
Transmit Crystal is marked with the primary frequency only, the above crystal is Transmit frequency of 3245 kHz. There is also a Tank Coil that is matched to the Crystal (These crystals are not matched to the above Receive crystals)
© 2014 Army Radio Sales Company, Used with Permission
FT-243 Tuning Crystals and antenna coils are stored in BX-49
The transmit frequency can be seen through the case
Receive and Transmit Crystals
Tuning Coil
MWO (Maintenance Work Orders
- MWO SIG 11-235-1
- Authorizes the replacement of die casr press-to-talk switch parts with steel stamped parts to minimize breakage in service. (8 August 1944)
- MWO SIG 11-235-2
- Authorizes the addition of a polystyrene antenna support insulator at the top of the chassis to provide firmer support for the telescopic rod antenna (25 August 1944)
- MWO SIG 11-235-3
- Authorizes the replacement of molded bakelite microphone and earphone caps by aluminum caps (18 October 1944)
- MWO SIG 11-235-4
- Authorizes the replacement of the top chassis mounting bracket with a stronger bracker held in place by two machine screws. (4 January 1945)
- MWO SIG 11-235-5
- Authorizes the necessary drilling of the bottom cover assembly to mount an external headset jack for use of Headset HS-30-( ) in connection with the Homing Modification Kit MC-619 (25 January 1945)
- MWO SIG 11-235-6
- Repeats MWO SIG 11-235-3 and adds MC-162 to the earphone and M-367 to the microphone caps for hot weather breakage and cold weather personnel protection. (1 April 1945)
- MWO SIG 11-235-7
- Added copper wire ground buss between all socket ground plates
- MWO SIG 11-235-8
- Adds a metal clip to the bakelite ON/OFF switch on the antenna bottom section.
Related Files
- Radio Sets
- SCR-536-A, -B, -C, -D, -E, -F
- May 1945
TM 11-4019[1]- Radio Receiver and Transmitters
- BC-611-A, -B, -C, -D, -E and -F
- Repair Instructions
- July 1945
- Schematic Diagrams for Maintenance of Ground Radio Communication Set
- October 1942
References
- ↑ TM 11-4019,
- "US Army Technical Manual Collection,"
- from the CECOM Historical Office archive, Aberdeen Proving Ground, MD.
- CECOM Historical Office
- "US Army Technical Manual Collection,"