Hybrid
Theory - Here is a drawing explaining how a
HYBRID circuit turns 2 wire intercom (one circuit with audio
both coming and going) into 4-wire audio (two audio
circuits one coming and one going).
Audio only
adapter - Strips off the DC voltage from your intercom system WET
lines and transformer balances the audio for recording or audio insertion.
This adapter is NOT what you need to connect to a fiber
system. See the HYBRID explanation above.
Jib Kit
adapter - remotes the standard camera intercom to the rear of a jib and
provides grip and Assistant Camera operators comm as well
with paralleled beltpacks.
Telex BTR Wireless Talk Around adapter to
2-wire - Sort of. Using a 2-4 wire converter like a SSA324 from
Telex or a CCI-22 from Clear-com, this adapter creates a wet version of the
WTA private talk between 2 BTR systems. It's limitation is that only
the second BTR has full connection to the WTA.
Transformer
impedance test for intercom -- Transformers which bridge
intercom lines should have a relatively high impedance at
low frequencies to avoid destroying the transmission line
characteristics of wet intercom. Shorting the low end
makes nulling hybrids on the line harder. This test
found a good and inexpensive transformer.
Dual
Complementary Talk Only Conference
A terrific way
to cut down on the chatter on the camera channel and
eliminate the massive 4-wire programming normally used.
Telex BTR800
2-wire level test -
This is a lab test using sine
wave and pink noise to prove that the Telex BTR800/825 2
wire interface does not provide enough return level to the
hard wire comm. FYI: The BTR system which was tested
had the most current level increase mods as recommended by
Telex.
