Figure 4-4. Harmonic Filter A1A2 Performance Test (Sheet 1 of 3)

TM 11-5820-919-40-2

HARMONIC FILTER PERFORMANCE TEST

NOTE 1:

The narrowband criterion is a maximum of 1.8 db insertion loss in the

passband. A shorting bar, connected between the two fabricated rf cables,

should be used to achieve a 0-db reference. The wideband criterion is

-40 db suppression beyond 3 times the lower band frequency of the selected

filter. To obtain narrow and Sideband spectral outputs as in the figures,

set the controls on the spectrum analyzer as follows:

Controls:

Narrow

Wide

Scan Trigger - AUTO

AUTO

Scan Mode - INT.

INT.

Video Filter - 10 kHz

OFF

10 kHz

Log/CM

2 db Log

10 db Log

Linear Sensitivity - 1

-1

-6

Log Reference - 0

Scan Time

5 ms

20 ms

Range

0-11 MHz

0-110 MHz

Input Attenuation

50 db

20 db

Bandwidth

100 kHz

300 KHz

Center Frequency

2.5 MHz

50 MHz

Scan width

0.2 MHz (Per Division)

.05 KHz (0-100 MHz)

(Inner Red)

Tracking Generator

Function

Track Analyzer

Same

RF Level

O dbm

Same

Each filter can legitimately be checked by at taching the RF signal genera-

tor to A2J1 and the power meter to A2J2; the of signal generator is set to

upper, middle, and lower points on the passband, and the insertion loss

(1.8 db maximum ) is read on the power meter. A zero reference is estab-

lished by connecting the rf signal generator to poser meter.

NOTE 2:

Scan width is 0.5 MHz, center frequency is 4,000 KHz

NOTE 3:

Scan width is 0.5 MHz, center frequency is 6,500 KHz

NOTE 4:

Scan width is 1 MHz, center frequency is 10,000 KHz, range 0-110

NOTE 5:

Scan width is 2 MHz, center frequency is 16,000 KHz, scan time 10 ms

NOTE 6: Scan width is 5 MHz, center frequency is 25,000 KHz, scan time 20 ms

NOTE 7: Unless otherwise specified, all voltage measurements taken with respect to chassis ground.