Specification Minimum Typical Maximum
Input Return Loss
at 950MHz……………………………………. 25dB
at 1450MHz…………………………………... 20dB
at 1650MHz…………………………………... 28dB
at 2150MHz…………………………………... 14dB
Output Return Loss
at 950MHz……………………………………. 18dB
at 1450MHz………………………….………. 18dB
at 1650MHz…………………………………... 15dB
at 2150MHz…………………………………... 11dB
1dB Input Gain Compression Point5
at 950MHz…………………………………….. -3dBm
at 1450MHz…….…………………………….. -3dBm
at 1650MHz…………………………………… -4dBm
at 2150MHz………..………………………….. -4dBm
Input Signal Power for 3rd Order Intermod Rejection Ratio of 40dB6
at 950MHz…………………………………….. -13dBm
at 1450MHz……………….………………….. -13dBm
at 1650MHz…………………………………… -14dBm
at 2150MHz………..………………………….. -15dBm
DC Supply Voltage………………………………………... 18.0VDC 20.0VDC
DC Supply Current………………………………………… 1.0A 1.5A
Transponder LNB Voltage………………….……………... 17.0VDC 18.00VDC 20.0VDC
For Indoor Use Only. The HDSSAG20DN is supplied with an external 18VDC power supply. Operating
temperature of the HDSSAG20DN 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 950MHz to 2150MHz. Satellite power meters
typically read the power level of a single transponder at a time. If all transponders are active from 950MHz to 2150MHz and the power of
all transponders are equal, then total available input power across the 950MHz to 2150MHz bandwidth is approximated by taking the
satellite power meter reading at 1450MHz and adding 20dB. Make sure not to exceed -15dBm as measured with a satellite power meter.
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 950MHz to 2150MHz.
(See note 1) 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. HDSSAG20DN Manual Version: Rev. 1.2
