Posts Tagged ‘radios’

HW-8 Bargain

I was up early on a Sunday morning last month, and saw a notice that a Heathkit HW-8 had been posted to Facebook late in the prior evening.  He wasn’t asking much for it, so I decided to shoot him a note and see if it was still available.  The owner wrote back, and I […]

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TS-430 Control Board: IC-1 Waveforms

IC-1 is the main processor chip on the Control Board of the TS-430.  It is a uPD8049c.  This 40 pin chip runs at 5.74 Mhz, and interfaces with virtually every control integrated circuit (IC-2 through IC-6) on the board.  You can see that it is central to the radio’s operation.

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TS-430 Control Board: IC-3 Waveforms

IC-3 on the control board is an I/O expander chip.  It is a uPD8243c.  This chip is directly compatible with the 8049 processor, and uses instructions received from the processor on pins 8-11 to control 4 output ports. These 4 ports control the PLL Oscillators, and interface with the two data selector chips (IC-4 and […]

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TS-430 Control Board: IC-2 Waveforms

IC-2 on the control board in an I/O expander chip.  It is a uPD8243c.  This chip is directly compatible with the 8049 processor, and uses instructions received from the processor on pins 8-11 to control 4 output ports. These 4 ports drive the multi-digit florescent display unit.

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TS-430 Control Board: IC-6 Waveforms

IC-6 is the static RAM chip that holds the band, frequency,mode, memories for long term storage.  It is used particularly when the radio is turned off in order to keep track of where you were operating.  When the rig is turned back on, data is read from the ram chip and the radio is set […]

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