Mark proved it isn't channel-proof. Just channel resistant.
The primitive PLL chips used in older radios have static input pins, one for each binary bit. Called "parallel input". The channel selector holds each pin to a steady state, either high or low. Like most models intro'd since Y2K, the 980 doesn't have a channel selector that puts out those steady binary bits. Has a rotary encoder that feeds pulses to a computer chip. The computer keeps track of the direction you turned it, and how many clicks.
Every PLL found in new radio models for decades is built for some kind of serial input. The 980 is one of those.
Serial, as in feeding those bits one at a time down a single wire, or a pair of them. Naturally if it takes a computer to feed the legal 40 channels into the factory PLL, you'll have to use a computer of some sort to modify what it does.
That's more or less what Mark did with the channel king. That, and he replaces the radio's original PLL to boot. Said it's easier to program.
If you wanted to advance the spark timing on your '67 Plymouth Valiant, you loosened a clamp and rotated the distributor a bit. Only needed a wrench. And a timing light.
But to do this to your 2020 daily driver, you'll need a laptop and the right software.
Cars have come a long way. And so have radios.
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