Specification
Minimum
Typical
Maximum
Input Return Loss
at 250MHz…………………………………….
10dB
at 950MHz…………………………………….
25dB
at 1450MHz…………………………………...
15dB
at 2150MHz…………………………………...
11dB
Output Return Loss
at 250MHz…………………………………….
14dB
at 950MHz…………………………………….
16dB
at 1450MHz…………………………………...
20dB
at 2150MHz…………………………………...
11dB
1dB Input Gain Compression Point
5
at 250MHz……………………………………..
-5dBm
at 950MHz……………………………………..
-5dBm
at 1450MHz……………………………………
-5dBm
at 2150MHz………..…………………………..
-7dBm
Input Signal Power for 3
rd
Order Intermod Rejection Ratio of 40dB
6
at 250MHz……………………………………..
-10dBm
at 950MHz……………………………………..
-13dBm
at 1450MHz……………………………………
-15dBm
at 2150MHz………..…………………………..
-17dBm
DC Supply Voltage………………………………………...
18VDC 20VDC
DC Supply Current…………………………………………
1.0A
1.5A
99 /101 Odd Transponder LNB Voltage………………….
12.5VDC
13.75VDC
14.5VDC
99 /101 Even Transponder LNB Voltage…………………
17.0VDC
18.00VDC
20.0VDC
103 /119 Odd Transponder LNB Voltage…………………
12.5VDC
13.75VDC
14.5VDC
103 /110 /119 Even Transponder LNB Voltage………….
17.0VDC
18.00VDC
20.0VDC
22kHz Tone Generator Frequency…………………………
.
22kHz
22kHz
Tone Generator Amplitude………………………….
0.3Vp-p
0.4Vp-p
For Indoor Use Only. The HDSSFG20B is supplied with an external 18VDC power supply. Operating
temperature of the HDSSFG20B is –40 C to +85 C. The mechanical dimensions are 6.4”W 4.4”L 1.5”H.
(Specifications subject to change without notice.)
Notes:
1.
Absolute Maximum Power is the total power that arrives at the amplifier input from 250MHz to 2150MHz. Satellite power meters
typically read the power level of a single transponder at a time. If all transponders are active from 250MHz to 2150MHz and the power of
all transponders are equal, then total available input power across the 250MHz to 2150MHz bandwidth is approximated by taking the
satellite power meter reading at 1450MHz and adding 20dB. Make sure not to exceed -20dBm as measured with a satellite power meter at
1450MHz.
2.
The –75dBm level assumes that the overall system noise figure is not too high such that the carrier-to-noise ratio of the satellite signal has
not been degraded such that signal recovery is not possible. Signal levels lower than –75dBm can be recovered with properly designed
systems having over-all low system noise figures. Low noise figure systems are achieved by avoiding the addition of too many attenuators
or too much loss in front of an amplifier block. It is always better to add loss after an amplifier to minimize system noise figure as long as
the signal at the amplifier input does not over-drive that amplifier.
3.
Assumes maximum power levels as measured with a satellite power meter and all transponder signals active from 250MHz to 2150MHz.
(See note 1) A frequency response loss slope of 5dB is assumed, i.e. transponder power measured at 250MHz with a satellite power meter
is 5dB higher than power measured at 2150MHz due to cable loss versus frequency characteristics. If transponder power levels are equal,
limit the maximum power to –20Bm at all frequencies. An easy method to determine if the amplifier is being over-driven is to connect a
satellite power meter to the output of the amplifier and check C/N, BER, and IRD performance. If acceptable transponder power levels are
measured but low C/N values, high BER values, and low IRD levels are measured, reduce the input level into the amplifier until good
C/N, BER, and IRD results are measured.
4.
Channel-to-Channel Isolation is measured referenced to the output of each amplifier. Channel-to-Channel Isolation has a typical value of
35dB at 2150MHz.
5.
Measured using a single CW signal. No transponder signals present.
6.
Measured using two CW signals with 1MHz spacing. No transponder signals present.
Copyright © 2010 HDTV Labs, All Rights Reserved. HDSSFG20B Manual Version: Rev. 1.1
