Ierc Heat Sinks

Davco Radio Amateur 07-1966

Sketching. The waveform of the above unit is shown in Fig. fi? as it was sketched, from storage scope face. Three cycles of 144 MHz RF are displayed so that I he amount of 4S MHz present can be observed. The fact that a rather special "scope was used for making Fig, (i does not mean that it was essential, but its use only confirmed our other measurer ments. The grid dip meter was the only necessary piece of test equipment.

rhe final circuit is shown in Fig, 7+ It was built inside a 5 X 7 X 2 aluminum chassis as shown in the photo. Note that the input circuit occupies occupies the 2Ji" compartment at one end of the chassis. The transistor is mechanically and electrically attached with an IERC TX 0507-1B heat sink to a 3 inch long piece of wide copper strap {the collector of a 2N3053 is connected to the case). This strap serves to dissipate heat, and also serves as a low inductance connection to the idlers. Note that the three coils for 48, 96, and 144 MHz are all spaced from each other and all at right angles to each other, to avoid inductive coupling. A bottom plate is used which completes the shielding of the input and output compartments. It has a %" hole in it for adjustment of C3 and a 1JS" hole immediately above so that the grid dip meter can be coupled to that coil during adjustments,

A second unit was constructed to try the principle as a 144 MHz to 432 MHz tripler (Fig, 8), The transistor used in this case was a 2N3553 (R.C.A.) which was about $8.00 when purchased.

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