Communication-concepts AN762 Construction Hints Bedienungsanleitung PDF herunterladen

CONSTRUCTION HINTS FOR THE AN762

These construction hints for the AN762 are only to supplement the Application Note and

are not meant to be used as a construction manual.

HEATSINK PREPARATION

A heatsink of sufficient size to dissipate over 140 watts of power should be used. The

heatsink should be marked, drilled, and tapped before construction begins on the PC

board. Using the bare PC board as a pattern, lay the PC board on the heatsink in the

desired position and mark the four mounting holes and the mounting hole for D1 Drill

and tap the four mounting holes and hole for D1 for 4-40 screws. Then bolt the bare PC

board flush on the heatsink and place the RF transistors through the PC board so they

rest on the heat sink. Mark the mounting holes for the RF transistors. Remove the PC

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CONSTRUCTION HINTS FOR THE AN762 These construction hints for the AN762 are only to supplement the Application Note and are not meant to be used as

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board from the heatsink and drill and tap the mounting holes for the RF transistors (4-40 screws). The heatsink can also be fitted with connectors, c

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Figure 2 Solder the wire leads from the output of T3 to the PC board. Clip the excess leads close to the PC board. The input transformer T1

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The 2N5990 and 2N5991 transistors are now obsolete. These transistors had an unusual pin configuration for which a direct physical replacement is n

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Install the current measurement loops on the output end of the PC board. These are the two “U” shaped #18 wires with three (3) ferrite beads on eac

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Install the 100uF 25 volt capacitor (observe the polarity). Solder and clip the excess leads close to the PC board. Turn the PC board over and i

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4. With a DC current meter connected in the power lead and without any RF applied to the amplifier input, turn on the DC power supply and adjust the

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Band Fcutoff (MHz) L1, L3 (uH) L2 (uH) C1, C2 (pF) 160 2.1 8.1 (23T on T-106-2) 11.4 (28T on T-106-2) 1653 80 4.1 4.1 (16T on T-106-2)

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Communication-concepts AN762 Construction Hints Bedienungsanleitung