Table of Contents
Advertisement
HPOD
Theory of Operation
3.5 P
S
OWER
UPPLY
The SSPA features a removable power supply which is also power factor corrected. It
connects to the main chassis via a specialized connector capable of the required high
current. It supplies several voltages necessary for the unit to operate. The 10V output is
capable of 2000W and supplies current to the power transistors in the RF amplifier
module via two paths, or cables (10V A and 10V B). The output status of this power
supply is controlled by circuitry within the RF module. If the RF module does not have
the –5V supply for any reason, it will not allow the 10V power supply to turn on. This
protects the power transistors within the RF module from failure due to improper power
supply sequencing. The +24V output powers the cooling fans and is the source of power
for waveguide switching when the SSPA is used in redundant configurations. The +5
and +15 voltages are used to operate the M&C board and other overhead functions.
3.6 B
U
LOCK
P
The HPOD amplifier, when delivered from the factory with an internal Block Up
Converter (BUC) translates an L-Band input carrier to the desired output frequency (C-,
X-, or Ku-). LO frequencies are as follows:
BUC-4000 C, X, Ku, Ka
Band
C-Band
X-Band
Ku-Band-W 13.75 to 14.50 GHz
The same Ku-Band BUC is installed independent of amplifier bandwidth. Therefore, the
"standard," 14.0 to 14.5 GHz HPOD has an L-Band frequency range of 1200 to 1700
MHz which translates up to 14.0 to 14.5 GHz, while the "Extended," 13.75 to 14.5 GHz
HPOD translates L-Band frequencies from 950 to 1700 MHz up to 13.75 to 14.5 GHz.
Unlike most BUCs, no DC bias voltage should be provided on the center conductor of the
L-Band coax.
In addition, the BUC version of the HPOD is available with an internal 10 MHz
reference. As, such, no 10 MHz reference is required on the center conductor of the L-
Band coax. If a reference is provided on the coax, the internal reference will detect and
lock to it.
C
I
ONVERTER
NPUT
Frequency
LO Frequency Inverting
5850 to 6650 MHz
7900 to 8400 MHz
O
PTION
4900 MHz
No
6950 MHz
No
12.800 GHz
No
3–4
Revision 2
MN/HPOD.IOM
Advertisement
Table of Contents
