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Thread: Quantro "HC11 Driver Overdrive" Error

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    Default Quantro "HC11 Driver Overdrive" Error

    Hoping someone can point me in the right direction on this since Quantros aren't my specialty.

    Getting no TSTAT during call alarms on an 800 Quantro in simulcast. Offending unit is logging an HC11 Driver Overdrive event that clears 2 seconds after it occurs. Working on the station it's not actually dropping out but just going down from 150 W to 85 W or so. Have replaced the high-power amplifier (this usually fixes it) and the little amplifier downstream of the exciter but no joy.

    TIA.


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    Power supply issue?

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    What are the SCB and exciter firmware versions?
    It is a fine thing to be honest, but it is also very important to be right

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    Control FW R020.14.028
    Exciter FW R020.09.005
    Wireline FW R020.14.002

    Thinking may have a bad final PA, wouldn't be the first time one of these quality Motorola factory reman'ed units was bad. That's my next stop, if that's not it I'll probably be swapping parts one at a time with the unit next to it to see when the problem moves. Don't have any spare power supplies.

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    Looks like the Exciter firmware is really old, like 3-4 generations old compared to the rest, that might be the source of the problem. An HC11 is a microprocessor, I am guessing that's what the Exciter microcontroller is, and it's getting an error from/with it.

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    Alpha is right, upgrade the exciter firmware (EPROM) even if you leave the rest of the station as it is. Get one from Mars or grill up one yourself.
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    I understand the point on old FW, but this station is one of 60, all of which have these same firmware versions. We're going to go back sometime this week or next and swap parts between this station and one of its neighbors and see what will get the problem to move to a different station. Of course, a report will follow.

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    It maybe that something has failed but there can be strange PA issues that the later firmware is more tolerant of. For example the rise time of the forward and reverse power detectors. Perfectly good PA modules get trashed when they're fine with the later software.

    Perhaps not revelant in your case but I've also found the later exciter firmware produces better P25 modulation fidelity and seems to be more tolerant of working at the band edges and beyond.
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    Bad IPA, and a bad spare IPA. Some asshat put a bad one back on the shelf and didn't bother to label it as such.

    Power supplies are good. Swapped both with the station next to it. Don't care to swap power supplies ever again, either. They are heavy and unbalanced.