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December 14th 03, 04:46 AM
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In article ,
Joe Aurelio wrote: In article , (Eric Behr) wrote: I'd like to make an external high capacity pack for my T90A for emergencies, long special events etc. The manual isn't [...] On mine, when the batteries are fully charged the T90 indicates Hi-V and does not transmit. I assume that it is in self protect mode at that time. Hmm, I've never ever seen that. Mine just says CHG_F and happily transmits (unless the wall-wart is plugged in). The manual says not to transmit with the charger plugged in (IIRC). With the small wall-wart charger, yes. But it is less clear in case of the "drop-in" rapid charger, and under the cigarette lighter adapter CP-19 heading it explicitely says "the BP-217 can be charged while you are operating", so I'm assuming there is no general prohibition on transmitting while external power is plugged in. That's what made me consider a self-made pack. If I were building a battery pack, I think I would keep it at or under 11 volts for recharging or 8.2 volts for operating. (8.2 is what I see on turn on whrn the battery has been fully charged.) I suppose it's better to play it safe, but 9.6V is well within the stated maximum. Still, a lower voltage might work just as well (given enough current), because the manual also says that "power supply range is 5.5 - 11.5 V", and then that "maximum output power is 5W regardless of P/S voltage". So they must be using some intermediate power conditioning circuit. If that is the case, maybe I'll start with a 6V pack to be on the safe side and see what happens. Thanks for the comments de KC9DUX. -- Eric Behr | NIU Mathematical Sciences | (815) 753 6727 | http://www.math.niu.edu/~behr/ | fax: 753 1112 |
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