-5-
iBox CONTROLS
3
4
(3) PTT Input (J3)
This female RCA connector is
used to provide push to talk
control (PTT). Grounding the
center jack of the connector grounds
the PTT line of the Audio Out connector.
(4) Audio Output (J2)
This 5 pin DIN connector provides
attenuated Input audio to the
connector. The audio provided
is isolated from the input audio.
The user may wire cables for either LOW-Z (600 ohms)
or HI-Z (50K) balanced or unbalanced. PTT function is
also provided at this connector
Gnd
PTT
- Mic
+ Mic
Balanced
Output
Hi-Z Output
Audio Output
5 Pin Male DIN
Din connectors shown
on side to be soldered
-8-
Value of R2 in “K” ohms
Value of R2 in “K” ohms
Value of R2 in “K” ohms
Value of R2 in “K” ohms
ATTENUATION OF AUDIO INPUT AS
R2 CHANGES WHERE R3=200 Ohms
MILLIVOLTS OF AUDIO OUTPUT AS
R2 CHANGES WHERE R3=200 Ohms
AND 1 VOLT OF AUDIO IS APPLIED
TO THE INPUT
MILLIVOLTS OF AUDIO OUTPUT AS
R2 CHANGES WHERE R3=0 Ohms
AND 1 VOLT OF AUDIO IS APPLIED
TO THE INPUT
ATTENUATION OF AUDIO INPUT AS
R2 CHANGES WHERE R3=0 Ohms
Attenuation in dB
Millivolt Output
Millivolt Output
Attenuation in dB
Figure 3A
Figure 3B
Figure 3C
Figure 3D
C2
.001 uf
C2
.001 uf
GndGnd
E3
C4
.001 uf
C4
.001 uf
C6
.001 uf
C6
.001 uf
RFC1
470 uh
RF choke
RFC1
470 uh
RF choke
RFC3-470 uh RF chokeRFC3-470 uh RF choke
RFC2
470 uh
RF choke
RFC2
470 uh
RF choke
RFC4
470 uh RF choke
RFC4
470 uh RF choke
C1
.001 uf
C1
.001 uf
C3
.001 uf
C3
.001 uf
C5
.001 uf
C5
.001 uf
600:600600:600
+ Audio Out+ Audio Out
+ Audio in+ Audio in
- Audio in- Audio in
- Audio Out- Audio Out
GndGnd
R1-1KR1-1K
R2
10K or 100K
fixed or variable
R2
10K or 100K
fixed or variable
R3
200
R3
200
R2R2
R4
1K
R4
1K
T1
1:1
++
C7
100 uf
C7
100 uf
E1
E2
E4
E5
E9
E8
E7
E6
iBox LOW-Z AUDIO OUT
RESPONSE CHARACTERISTICS
Note:
R2 Pot factory installed at 100K ohms
R3 factory installed at 200 ohms
Figure 2
Figure 4
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