Difference between revisions of "U-229"

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;Pin A Common Ground
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:The common ground for audio and is typically the same as chassis ground. 
  
==Pin A Common Ground==
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;Pin B Handset speaker
Pin A is used as the common ground for audio and is typically the same as chassis ground.
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:Audio output to the handset speaker.
  
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;Pin C Push To Talk
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:When grounded it puts the transmitter into transmit mode
  
==Pin B Handset speaker==
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;Pin D Mike
Pin B is used for the radio's audio output that is to drive a handset speaker.  In most radios with an internal speaker, like the PRC-68 family,  there is a DC signal imposed on top of the AC audio signal so the radio can detect if a handset/speaker has been connected and if so the internal speaker is muted.
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:Microphone input to the radio.
  
 
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;Pin E Not Standardized
==Pin C Push To Talk==
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:Different radios use it for different purposes.  For example:
Pin C is the Push to Talk release to listen line.  When grounded it puts the transmitter into transmit mode and when released into receive mode.
 
 
 
 
 
In radios that have a CW mode, like the PRC-70, PRC-138 and HarrisRF-5000 series you use the PTT line for CW keying.  If the radio only supports SSB modes you need to use pin E for keying CW since using the PTT line on a SSB mode does not turn on a carrier.
 
Memory aid: after you have accounted for pins A, B and D, pin C is the one that's left.  Only 4 pins are used for the audio functions.
 
 
 
 
 
==Pin D Mike==
 
Pin D is the microphone input to the radio. Dynamic mikes are used with the U-229 family whereas carbon mikes were the common military mike on earlier versions of the connector like the U-77 or 1/4" phone plug.
 
 
 
 
 
==Pin E Not Standardized==
 
For classical audio applications pin E is not standardized.  Different radios use it for different purposes.  For example:
 
 
PRC-68 Family of Squad Radios uses pin E for "12 Volt" vehicle power input.
 
PRC-68 Family of Squad Radios uses pin E for "12 Volt" vehicle power input.
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:The HF manpack radios PRC-74 and PRC-104 use pin E for the CW key input, and it's also used for high speed CW like from a GRA-71.  Note that the pin C PTT line can NOT be used for CW keying on a radio that supports SSB operation, since there would be no output.
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:The VRC-12 series Squad radios uses pin E as the loudspeaker line to drive the LS-454.
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:The PRC-25,  PRC-77 AUDIO and the RT-246, RT-524 & R-442 RETRANS use pin E as the retrans PTT to key the other RT with the Mk-456 Retransmission Kit.
  
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;Pin F Not Standardized==
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:This is the center pin that is not present on a true U-229 connector.  Many radios install the 6 pin version of this connector, yet do not connect a wire to pin F.  Maybe it's done to allow a future modification, or maybe just to standardize the connector?  Some equipment does use this pin where the other pins are used in the above audio functions, for example:
 +
:The PRC-68 Family, except the PRC-68 and PRC-68A, use this pin for digital up and down loading of the channel frequency assignments and as the retransmission PTT output.  This supports a retransmission cable and cloning cable that are different than the Mk-456.
  
The HF manpack radios PRC-74 and PRC-104 use pin E for the CW key input, and it's also used for high speed CW like from a GRA-71.  Note that the pin C PTT line can NOT be used for CW keying on a radio that supports SSB operation, since there would be no output.
 
 
 
The VRC-12 series Squad radios uses pin E as the loudspeaker line to drive the LS-454.
 
 
 
The PRC-25,  PRC-77 AUDIO and the RT-246, RT-524 & R-442 RETRANS use pin E as the retrans PTT to key the other RT with the Mk-456 Retransmission Kit.
 
 
 
==Pin F Not Standardized==
 
This is the center pin that is not present on a true U-229 connector.  Many radios install the 6 pin version of this connector, yet do not connect a wire to pin F.  Maybe it's done to allow a future modification, or maybe just to standardize the connector?  Some equipment does use this pin where the other pins are used in the above audio functions, for example:
 
The PRC-68 Family, except the PRC-68 and PRC-68A, use this pin for digital up and down loading of the channel frequency assignments and as the retransmission PTT output.  This supports a retransmission cable and cloning cable that are different than the Mk-456.
 
  
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[[File:U-229_assembly.png|400px]]
  
 
==U-229==
 
==U-229==
[[File:U-229_1.gif]]
 
  
 
==U-228==
 
==U-228==
[[File:U-228_1.gif]]
 
  
 
==GC-328==
 
==GC-328==
[[File:GC-328.gif]]
 
  
 
==U-183==
 
==U-183==
[[File:U-183.gif]]
 

Latest revision as of 01:48, 24 September 2013

Pin A Common Ground
The common ground for audio and is typically the same as chassis ground.
Pin B Handset speaker
Audio output to the handset speaker.
Pin C Push To Talk
When grounded it puts the transmitter into transmit mode
Pin D Mike
Microphone input to the radio.
Pin E Not Standardized
Different radios use it for different purposes. For example:

PRC-68 Family of Squad Radios uses pin E for "12 Volt" vehicle power input.

The HF manpack radios PRC-74 and PRC-104 use pin E for the CW key input, and it's also used for high speed CW like from a GRA-71. Note that the pin C PTT line can NOT be used for CW keying on a radio that supports SSB operation, since there would be no output.
The VRC-12 series Squad radios uses pin E as the loudspeaker line to drive the LS-454.
The PRC-25, PRC-77 AUDIO and the RT-246, RT-524 & R-442 RETRANS use pin E as the retrans PTT to key the other RT with the Mk-456 Retransmission Kit.
Pin F Not Standardized==
This is the center pin that is not present on a true U-229 connector. Many radios install the 6 pin version of this connector, yet do not connect a wire to pin F. Maybe it's done to allow a future modification, or maybe just to standardize the connector? Some equipment does use this pin where the other pins are used in the above audio functions, for example:
The PRC-68 Family, except the PRC-68 and PRC-68A, use this pin for digital up and down loading of the channel frequency assignments and as the retransmission PTT output. This supports a retransmission cable and cloning cable that are different than the Mk-456.


U-229 assembly.png

U-229

U-228

GC-328

U-183