A-A-50728 Frequency Selective Levelmeter And Spectrum Display FslsdThis Commercial Item Description CID describes a frequency selective levelmeter and frequency selective levelmeter with spectrum display. This CID is meant as a minimum requirement for the equipment, in either configuration, and only those manufacturers that meet or surpass the requirements herein are qualified per this CID. The frequency selective levelmeter and/or spectrum display is referenced as a FSLSD, the equipment, or the test equipment.

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A-A-50728A

c. Overload indicator. The equipment shall have an overload indicator light. It shall light up when high level inputs as follows are present:

For 1800 channels
Tone Mode	25 dB overdrive typical
Noise Mode	45 dB overdrive typical

d. Signal indicator. The equipment shall have a signal indicator light that is activated when a signal equivalent to -8 dB is present.

4. Bandwidth. The equipment shall provide three bandwidths. Filters shall have the following selectivity:

Filter
75 Hz	75 Hz ±10%	350 Hz
1.75 KHz (equivalent noise bandwidth)	2.3 KHz ±10%	4.6 KHz
3.1 KHz	3.1 KHz ±10%	6.2 KHz

5. Internal distortion.

a. Harmonic. The harmonic distortion for the equipment shall be 75 dB below the fundamental for a 60 dB sensitivity increased from 10 KHz to 25 MHz .

b. Noise power ratio (NPR). The NPR for the equipment shall be a minimum of 54 dB for a 40 dB sensitivity increase for an equivalent noise power, equivalent to 1800 channels. For an equivalent 600 channels, NPR shall be a minimum of 56 dB for a

40 dB sensitivity increase.

6. Intermediate frequencies. The equipment shall proved three intermediate frequencies with an IF

and Image rejection of 80 dB. These three frequencies shall be:

IF 1	50.7 MHz
IF 2	10.7 MHz
IF 3	80 MHz

7. Audio output. The equipment shall provide audio monitor jacks for external test equipment.

a. Speaker. The equipment shall provide an internal speaker connected to the audio output.

b. Control. Both the equipment's speaker and audio output monitor audio level shall be controlled by a volume adjust located on the front panel.

c. Functions. The equipment shall provide USB, LSB and AM modulation functions.

These functions shall be either pushbutton selectable or knob selectable. Control or controls shall be located on the front panel.

8. Residual phase jitter. With a 20 dB overdrive to the meter, residual phase jitter for the equipment shall be 0.5° nominal for signals 20 Hz to 300 Hz from the carrier.

9. Tracking signal output. The equipment shall provide a tracking signal output from rear panel at 0 dBm ±0.25 dB into 75 ohms impedance from 1 KHz to 25 MHz .

10. Recorder output. The equipment shall provide 0.8 volts DC typical into 1 K ohm impedance for 0

dB on meter for recorder operation.