MNC-0300-036
16 of 29
Revision F
Unpacking and Installation
A +15 VDC voltage is supplied that can deliver up to 10 mA. This supply
voltage is available on Pin f. The return for this voltage is either Pin a or
Pin Z.
RF Inhibit control
The HPA has the capability to Inhibit RF. If the unit has a SSA
preamplifier, inhibit is accomplished by turning off the bias supply to the
SSA driver.
RF Inhibit Polarity Select
The user can select the RF Inhibit polarity via the serial interface to either
inhibit when input is Hi or when the input is Low. Table 4 summarizes the
four combinations of the two inputs. There are two cases when RF inhibit
will occur:
•
When the Opto Input is OFF and Polarity input is Low.
•
When the Opto Input is ON and Polarity input is Hi.
RF Inhibit with Internal Source
Figure 8 shows RF Inhibit with Internal Source circuit using the HPA
internal 15 VDC (Jumper J1-g to J1-f) and ground (Jumper J1-Y to either
J1-Z or J1-a). RF will be inhibited when switch A is closed and Polarity
Input is Hi.
Table 4, RF Inhibit Conditions
RFI Opto Input
RFI Polarity Select
RF Inhibit
Off
Hi
No
On
Low
No
Off
Low
Yes
On
Hi
Yes
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