Re: LA-1K overdrive warning
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The temperature at certain outputs can vary a little from amp to amp.? Also, ambient conditions can determine the limits.? Long key-down operation at 200 watts will produce over 70C, that's not unusual.? It shouldn't get that warm on SSB unless you're using highly processed audio during very long transmissions.?? High ambient temperatures (like 80-degree room temperature) or high altitude operation will allow the temperature to increase more than expected.?? I live at 9,000 feet, and have to de-rate a little bit, but *never* approach a limit (or even 70 degrees) at SSB. ?? My amp is most efficient on 6 meters, upwards of 70%, and close to about 55% on HF frequencies. Dennis
On 12/29/2022 at 6:15 PM, "W9KEY Fred" <fred.schwierske@...> wrote: I run drive my LA-1K with an ICOM IC-7610 at up to 45 watts max (most bands using SSB phone) and only once remember getting an overdrive trip-out warning.
Even with contest CQing, I typically set the drive between 40-45 watts, with resulting output at about 900 watts, with occasional peaks at 1000.
Amp is running on 120 Vac.
The only problem I have - my amp runs much too hot - into the high 70's C.
It will stabilize on SSB Phone per above, but testing on FT8 digital shows it will overheat at around 200 watts (depending on the band), and only 175 watts on 10 meters.? Been meaning to phone Palstar - perhaps there is something wrong with it?
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