JVC GY-HD250U Interfacing JVC's CCU (RM-HP250AU) with common Intercom systems
JVC GY-HD250U - 3-ccd Prohd Camcorder Manual
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- JVC GY-HD250U | Interfacing JVC's CCU (RM-HP250AU) with common Intercom systems - Page 1
Interfacing JVC's CCU (RM-HP250AU) with common Intercom systems The RM‐HP250AU can be connected to Balanced Termination Spec 200Ω 200Ω 300Ω Manufacturer Telex Communications, Inc. Clear-Com Intercom Systems Telex Communications, Inc. The RM-HP250AU has three terminals that are used to interface - JVC GY-HD250U | Interfacing JVC's CCU (RM-HP250AU) with common Intercom systems - Page 2
perform the side tone adjusted described on page 1-9 of the RM-HP250AU service manual NO HC025. Step 2 When connecting to a 2W balanced HD250U's head set If the intercom Audio level at the Camera operator's head set is too low then R326 (12K) on the RM-HP250AU's main board should be replaced - JVC GY-HD250U | Interfacing JVC's CCU (RM-HP250AU) with common Intercom systems - Page 3
Step 2 Remove the 12K resistor and solder an 8.2K resistor in its place. See location of R326 in Fig 1and expanded view of location in Fig 2. Fig 1 RM-HP250AU with cover removed S301 RTS/2W Switch Fig 2 R326 Fig 2 Circled Area Magnified Step 3 Fig 2 Reassemble the RM‐HP250AU and test the
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Interfacing JVC’s CCU (RM-HP250AU) with common Intercom systems
The RM
‐
HP250AU can be connected to either a two wire balanced or a two wire unbalanced intercom
system. The table below lists common intercom systems, audio type(balanced or unbalanced), system
impedance and manufacturer.
Intercom System
Audio type
Termination Spec
Manufacturer
RTS™
Unbalanced
200
Ω
Telex Communications, Inc.
Clear-Com
Unbalanced
200
Ω
Clear-Com Intercom Systems
Audiocom®
Balanced
300
Ω
Telex Communications, Inc.
The RM-HP250AU has three terminals that are used to interface with balanced and unbalanced
two wire audio intercom systems. These terminals are labeled G (ground) C (cold) H (hot).
The table below shows the signals carried on the 3 pin XLR microphone cables used by the most
common intercom system providers.
Pin
Clear-Com
RTS™ TW
Audiocom®
1
Ground
Ground
Ground
2
30V Pwr
CH1 unbalanced Audio
30V Pwr
Balanced Audio +
3
Unbalanced audio
CH2 unbalanced Audio
Balance Audio -
Connecting the RM-HP250AU to an unbalanced Audio Intercom system
Step 1
Make sure that S301 on the RM-HP250AU main board is set to the unbalanced audio position
(RTS) which is the factory default position. See fig 2 on last page.
Step 2
When connecting to a 2W RTS™ system, wire the three pin microphone XLRs that are used to
connect the RTS™ intercom system to the RM-HP250AU as shown below. As indicated below
connect the RTS™ XLR’s pin2 to the RM-HP250AU’s H terminal if Audio channel 1 is being
used. If audio channel 2 is used, then connect pin3 to the RM-HP250AU’s H terminal.