7

RF input frequency

Nominal power at mixer

Preamp off

20 to 200 MHz

0 dBm

+3 dBm

200 MHz to 3.0 GHz

+3 dBm

+7 dBm

3.0 to 6.6 GHz

+3 dBm

+4 dBm

6.6 to 26.5 GHz

–2 dBm

0 dBm

Preselector bypassed (Option 123)

3.045 to 26.5 GHz

+8 dBm

Preamp on (Option 1DS)

Nominal power at preamp

10 to 200 MHz

–30 dBm

200 MHz to 3 GHz

–25 dBm

Preamp on (Option 110)

10 to 200 MHz

–24 dBm

200 MHz to 3 GHz

–20 dBm

3.0 to 6.6 GHz

–23 dBm

6.6 to 26.5 GHz

–27 dBm

RF input frequency

Compression

20 to 200 MHz

0 dBm

< 0.5 dB

200 MHz to 6.6 GHz

+3 dBm

< 0.5 dB

6.6 to 26.5 GHz

–2 dBm

< 0.4 dB

Noise figure

(Input terminated, 0 dB input attenuation)

Frequency

Noise figure

Noise figure

(typical)

(typical)

Preamp off

(Option 110 not installed)

10 to 100 kHz

38 dB

34 dB

–139 (dBm/Hz)

100 kHz to 1 MHz

30 dB

26 dB

–147 (dBm/Hz)

1 to 10 MHz

25 dB

22 dB

–151 (dBm/Hz)

10 MHz to 1.2 GHz

22 dB

20 dB

–153 (dBm/Hz)

1.2 to 2.1 GHz

23 dB

21 dB

–152 (dBm/Hz)

2.1 to 6.6 GHz

24 dB

22 dB

–151 (dBm/Hz)

6.6 to 13.2 GHz

26 dB

21 dB

–152 (dBm/Hz)

13.2 to 20 GHz

29 dB

26 dB

–147 (dBm/Hz)

20 to 26.5 GHz

33 dB

30 dB

–143 (dBm/Hz)

1. Gain compression is described by a level/compression pair where for every mixer level there is a different amount of compression. The first table labeled

“1 dB compression point” indicates the signal level where you will see 1 dB of compression, where as the second table indicates the amount of compression

to expect at a given signal level.

2. Large signals, even at frequencies not within the IF bandwidth, can cause in-band signals to be compressed because of two-tone gain compression.

This specification tells how large an interfering signal must be in order to cause a 1 dB change in an in-band signal.

3. Mixer power level (dBm) = input power (dBm) – input attenuation (dB).

4. Input referred noise density (dBm/Hz) = thermal noise at +55 °C (dBm) + noise figure of the downconverter (dB). The noise measured at the IF output’s of

the downconverter will be higher due to the Conversion gain, the measurable noise density is not diminished due to this gain.