SOUTHERN AVIONICS COMPANY
Model SA100 Dual2-32 Theory of Operation, Radiobeacon
2.3.9 Filter
SLP29700 is the Standard Band Filter
The square wave output from the Switching Power Amplifier is filtered on the 5 band FILTER
PCB. The filter is a modified symmetrical 7 element 50 ohm Butterworth filter. Standard
frequency bands, chosen with jumpers, are 190-220 KHz, 220-280 KHz, 280-360 KHz, 360-440
KHz, and 440-535 KHz.
SLP29720 is the extended band filter. It has jumpers for one frequency band of 535 - 625 KHz.
SLP29740 is the “M” Band Filter. It has jumper settings for the following bands: 500-650 KHz,
650-800 KHz, 800-950 KHz, 950-1000 KHz and 1100-1250 KHz.
SLP29730 is the “H” Band Filter. It’s jumpers are set for one frequency band of 1500-1800KHz.
Jumper tables exist for each of the PCB’s schematics.
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