[ICOM] Icom T90A wall charger question

[Gary Fiber]

Jim

You are exactly right. The T-90 can draw some 2 amps of current when 
transmitting at 5 watts of power. The wall charger is not able to source 
that current amount. Yes  Icoms handhelds remove the battery from 
circuit when using the wall charger and Cigar lighter power plug. This 
only allows the battery to be recharged also the transceiver to be 
directly powered from DC when the operating current is high enough. One 
handheld that sticks in my mind that will not operate directly from DC 
input is the T-2. A real old handheld was the 2A, 3A and 4A series. They 
required 9.0 volts to operate maximum which was supplied by an external 
DC-1 battery elininator. Many thought they were operating directly from 
external power when they plugged a power cable into thew battery pack on 
that series. In reality they were only recharging the battery but in 
some packs 12 volts would appear across the battery terminals that could 
cause the final transistor in the 2A,3A, and 4A series to fail.

Be mindful of the battery pack to exercise it fully every couple of 
weeks. I have seen Li-ION's in laptops go away due to lack of use. 
Others here may have another opinion on the T-90 battery.

Enjoy it.

Gary K8IZ

Jim Miller wrote:
> I went through this dilemma when I first got my T90.  My question was about
> WHY they would allow the operation of the T90 from the cigarette lighter
> "charger" but not allow it from the wall-wart.
>
> I finally purchased the cigarette lighter charger also.  I thought maybe the
> car charger had a voltage limiter in it and that they didn't want the T90
> operated on the 12v I measured from the wall-wart.  Wrong.  My conclusion
> after getting the car charger and finding the same charging voltage from it
> as the wall-wart, is that the wall-wart will not supply the necessary
> current to operate the radio in transmit and that the car charger will.  I
> believe this to be true now and that the charging plug effectively removes
> the radio battery from being able to supplement the charger when attached so
> the charger has to be capable entirely on it's own of supplying all current
> necessary for transmit.  YES, I HAVE used the radio on the car charger in
> transmit and it works fine as documented.
>
> The car charger is cheaper than an additional battery and the charge time is
> much less even with the radio on and mostly monitoring.  You can add a
> gelcel carry pack (several amp-hours) for quick recharges while still
> operating if you have to be portable all the time.
>
> 73, Jim
>
> ----- Original Message ----- 
> From: "John Geiger" <aa5jg at lcisp.com>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Friday, June 29, 2007 9:22 PM
> Subject: Re: [ICOM] Icom T90A wall charger question
>
>
> Thanks Jim,
>
> So I am assuming that any 12 volt 200mah wall charger should work. That is
> interesting since the manual recommends using the special CP19 cord when
> running the radio off of a cigarette lighter, and that is supposed to lower
> it to 11.5 volts.
>
> 73s John AA5JG
>
> ----- Original Message ----- 
> From: "Jim Walker" <jim at walkersdomain.com>
> To: "'ICOM Reflector'" <icom at mailman.qth.net>
> Sent: Saturday, June 30, 2007 2:00 AM
> Subject: RE: [ICOM] Icom T90A wall charger question
>
>
> John,
>
> Just happened to have one right here on my desk.
>
> Its rating for output is 12 VDC at 200ma.
>
>
> Jim
> KBØX
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
> Behalf Of John Geiger
> Sent: Friday, June 29, 2007 8:57 PM
> To: Icom-IC-T90 at yahoogroups.com; ICOM Reflector
> Subject: [ICOM] Icom T90A wall charger question
>
> Can someone who has a T90A look at the wall charger and tell me the voltage
> and current ratings for it.  It is listed in the manual as a BC110AR, but
> the specifications are not given for it.
>
> 73s John AA5JG
> (ex: W5TD, NE0P, N0EEN, KA0IFG)
> Confirmed 6M addict: 6M WAS #1275, 6m VUCC #1260
>
>
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net Icom Users
> Net: Sundays, 1700Z, 14.316 MHz Icom FAQ: http://www.qsl.net/icom/
>
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>
>
>
>