RF Filter A1A5

TM 11-5825-271-34

525 kHz in five strapping configurations, see figure 2-3.

2-18. RF Filter A1A5

The network formed by R1, R2 and C1 provides damping

(fig. FO-8)

for transients generated in the pa module A1A4.

a. The purpose of the rf filter AlA5 is to attenuate

Transformer T1 provides impedance matching between

the harmonic components in the input at J1 from the pa

the rf filter AlA5 and the pa module A1A4. Network

module AlA4. The rf filter AIA5 consists of two 1/4-

comprising R3/R4, L9/L10 and C6/ C7 provides a

wavelength sections which are cascaded to produce a

terminating impedance for the out-of-band frequencies.

five-pole, 1/2-wavelength filter.

This is necessary because the antenna system presents

b. The rf filter AlA5 contains 10 programming

a very high impedance to frequencies outside the

straps which permit selection of appropriate component

operating band.

values to cover the operating range of 190 to

Figure 2-3. RF Filter Strapping.

2-8