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06
WRS
System Guide
08/2004
NOTES
Old Radio Modem vs. New Radio Modem
The new radio modem inside the WMU-3, Studio LDB-2, Lite LDB-2 and URM-3 is
smaller and lighter than the old one, it draws less power and has a more robust trans-
mission scheme. Because of that, it is not compatible with the old radio modem used in
the WMU-1, Studio LDB, Lite LDB and URM-1.
To preserve the rental houses' investment in the existing hardware, we offer an upgrade
path to install the new radio modems in the old hardware. The old hardware with the
new radio modem will be labeled WMU-2, Studio LDB-2, Lite LDB-2 and URM-2.
This naming scheme roughly follows the following convention:
Old hardware, old radio modem: XXX-1
Old hardware, new radio modem: XXX-2
New hardware, new radio modem: XXX-3
So you can easily distinguish between the old and new radio modems, we have also
added a blue washer around the antenna port of the new radio modems. A detailed
description of the differences between the new and old radio modems can be found in
the ARRI Technical Note P-1030 “New Wireless Radio”, which is located on the
DOWNLOAD page of the ARRI web site.
Using Cables Instead of Radio Transmission
There are two ways to connect the hand controllers with cables to the cameras:
First, the Wired Handgrip Attachments WHA-2 or WHA-3 connect with cables to the
cameras, and the hand controllers can be attached to them. Use cables LC-M1, LC-Z1
or LC-Z2 to connect to the LCS port of a 435 Xtreme or ARRICAM, or KC-70 to
connect to the CAC port of an ARRICAM. The Wired Handgrip Attachment WHA-1
connects the Wireless Remote Control WRC-1 with cable WC-W1 to the CCU port of
all models of ARRIFLEX 435, 535 and 16SR3 or to the remote port of the ARRIFLEX 235.
Second, it is possible to connect a cable between the antenna connector of the hand
radios and the camera radios. Cable WC-A3 can be used to connect the WMU-1 anten-
na connector to the antenna connector of URM-1, Studio LDB or Lite LDB. The same
cable is also used to connect the WMU-2 or WMU-3 to the antenna connector of
URM-2, URM-3, Studio LDB-2 or Lite LDB-2. Don’t use cable WC-A1. Authorized
ARRI Service Centers can upgrade cable WC-A1 to WC-A3.
Please note that with or without a cable, units with the old radio modem are not com-
patible with units with the new radio modem.
Cable WC-A2 can be used for extending the antenna away from a radio unit.
WMU-3 with blue washer