HI-1570
Point
“AT”
TRANSMITTER
BUSA/B
52.5 W
(.75 Zo)
1:1.79
1:1.4
TXA/B
TXA/B
35 W (.5 Zo)
BUSA/B
52.5 W
(.75 Zo)
Isolation
Transformer
Coupling
Transformer
TXINHA/B
VCONT A&B
Point
“AT”
RECEIVER
52.5 W
(.75 Zo)
1.4:1
1.79:1
RXA/B
RXA/B
35 W (.5 Zo)
52.5 W
(.75 Zo)
Coupling
Transformer
Isolation
Transformer
RXENA/B
Figure 3. Transformer Coupled Test Circuits
7.5
FS
Slope = DVo ÷ DVCONT A&B
6.0
0.8FS
0.6FS
0.4FS
0.2FS
0
4.5
3.0
1.5
0
0
1.0
2.0
3.0
4.0
5.0
Control Voltage - VCONTA&B
Figure 4. Transmitter Output Amplitude (Vo)
vs VCONT A&B Voltage
HOLT INTEGRATED CIRCUITS
6