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Re: Ft817 shuts off at 10 volts?
开云体育Despite many postings to this list and its yahoo predecessor correcting people, people continue to make incorrect postings about power output and how the 817 displays it. Below is a re-posting on this issue courtesy of Mike KD5KC. Key takeaway is that the display behaviour varies with the voltage. ? ? Matt VK1MA ? -------------------------------------------------------------------------------------------------------- IT HAS NOTHING TO DO WITH BATTERY POWER !!!!! ? Here is how to read the FT-817 power display. ? To control the power levels, press the function (F) button for <1 second, [Pg 12, item 8], then rotate the SELECT knob [Pg 12, item 13] to display menu item 9 [ PWR MTR xxx ] on Pg 15.? (xxx will equal pwr for POWER level, alc for ALC level, swr for SWR display or mod for FM deviation level).? Press button A to control the power level, button B to select the meter display [Pg 12, item 9].? Press the PWR button (button A) 4 times or more to step through the display. ? With an input voltage or battery voltage GREATER THAN ~ 11.5 volts, the display will look like this. ? (L_l__) One bar displayed = 0.5 watts. (L_ll_) Two bars displayed = 1.0 watts. (L_lll) Three bars displayed = 2.5 watts. (L____) No bars displayed = 5.0 watts. ? ? With an input voltage or battery voltage LESS THAN ~ 11.5 volts, the display will look like this. ? (L_l__) One bar displayed = 0.5 watts. (L_ll_) Two bars displayed = 1.0 watts. (L_lll) Three bars displayed = 2.5 watts. (L____)-(L_lll) (BLINKING) Three BLINKING bars displayed = 5.0 watts. *note1. ? This information is in the FT-817ND manual, on page 28.? It just isn't written very well. ? *note1:? The blinking display is a warning that you are using the 5-watt level while on battery power, and with the stock YAESU battery, your time on the air will be limited.? Using a larger external battery, or one of the larger capacity internal batteries will increase your air-time considerably. ? The reality is that it has nothing to do with battery or power supply.? It is simply sensing the voltage applied to the radio.? Any voltage below about 11.5v will show a blinking display.? Any voltage above about 11.5v will show a steady display.? It has nothing to do with what the power source really is. ? ? From: [email protected] <[email protected]> On Behalf Of Mike Davis via groups.io
Sent: Saturday, 1 February 2025 1:52 AM To: [email protected] Subject: Re: [ft817] Ft817 shuts off at 10 volts? ? Thanks. I finally got out my QRP dummy load wattmeter, which I should have done earlier. What confused me was when the lines are full it's 2.5 watts, then steps down, 1 watt then .5 watt to no lines at 5 watts, but at 5 watts there is a square left on the display vs an L looking thing.? ? Mike WA1MAD ? On Thu, Jan 30, 2025, 7:58?PM Tobias KK7BCO/2M0TFF via <feltusfecit1=[email protected]> wrote:
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