Comtech EF Data EQ90 Series - Manual (Page 59)

Application Note EQ90 Amplitude Equalizer
A–2 Rev. 2
A.2 Operational Parameters
Attention must be paid to IF levels and how external parameters are adjusted to achieve
optimum results from the equalizer.
The equalizer is specified for a nominal +15 dB gain. The gain will vary slightly,
approximately ± 1.5 dB over the 0° to 50°C (32 to 132°F) operating temperature range.
Composite IF input levels should not exceed -15 dBm, however:
•
If attenuation at the input of the equalizer is required, use the minimum amount
of attenuation necessary to achieve the equalizers specified input level. The
equalizer has a high noise figure, the same as the DEQ-7XX series of equalizers,
which is typically 34 dB.
•
Use the highest IF input signal level possible that will increase the equalizers
overall signal-to-noise ratio.
•
If the gain of the equalizer needs to be reduced, it should be done at the IF output
using fixed attenuators. Attenuating the IF output of the equalizer will reduce the
output noise power of the equalizer which is typically -125 dBm/Hz.