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If you are a relative newcomer to amateur radio and have been itching to get your feet wet in your first electronic construction project, then read on, because this article is for YOU! Perhaps in the past you have seen articles that advocate various circuitry modifications to commercial rigs, but maybe you have been a bit reluctant to drill that first hole to mount the switch, jack, or control that will alter forever the face (and hence the resale value) of your expensive piece of equipment. Well, take heart, fellow hams, because here is a modification for your Kenwood TR-9000 that will provide a very useful enhancement to this fine rig’s c.w. operation, and yet this modification will not require you to drill any holes in the rig or to butcher its appearance even a tiny bit! The Kenwood TR-9000 is a multi-mode transceiver providing f.m., s.s.b., and c.w. operation on 2 meters in a compact package with excellent features. I enjoy operating c.w., and the TR-9000 does a very respectable job in this mode with one small exception: it does not have any c.w. break-in system, which means that you must manually throw a switch each time you change between transmit and receive. Circuit Description, Fig. 1 is a schematic diagram of the c.w. break-in circuit for the TR-9000. I have drawn this circuit in a slightly modified manner to make it easier for beginners or others not experienced in working with integrated circuits to see a correlation between the 16-pin integrated-circuit package and the schematic diagram of the circuit in which it is used. This circuit is constructed around a CMOS integrated circuit, a CD4098 retriggerable monostable multi-vibrator. This modification may be left in place and will not affect operation in modes other than c.w. In c.w. operation simply adjust the delay time control so that it is appropriate for the c.w. speed you are using. I like to have mine set so that the transceiver will drop back into the receive mode between words as I am sending, but stay in transmit between letters within a word.
Tags : fellow hams, kenwood tr, relative newcomer, mode transceiver, electronic construction, respectable job, small exception, circuit description, integrated circuits, cd4098, compact package, schematic diagram, first hole, delay time, integrated circuit
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