JR 3810 Fast Charging Question

[Steve]

I have a JR 3810 ADT Radio Set. I currently remove the battery to fast
charge. If I make up a lead to fit the transmitter, can I fast charge
through this without removing the battery? How much current can you push
through the transmitter?

Many thanks
Steve

[david]

"Steve" <tiggerthefish@yahoo.co.uk> wrote in message
news:bg81bg$oe4$1@news8.svr.pol.co.uk...
> I have a JR 3810 ADT Radio Set. I currently remove the battery to fast
> charge. If I make up a lead to fit the transmitter, can I fast charge
> through this without removing the battery? How much current can you push
> through the transmitter?
>
> Many thanks
> Steve
>
>

You aren't pushing anything thro' the transmitter as the cells are wired
straight to the dc jack. At best / worst they#ll go thro a fuse.

You can fast charge quite happily at up to 2 to 2.5 amps if the fuse will
take it. I charge my trannies at c1.5amps all the time with a cycle every
now and then. I had to change the fuse in the MPX tx though.

david

[Steve]

Thanks for that. It will be much easier than constantly removing the
battery. I only want to charge at 1.2A so that should not be a problem.

Thanks again
Steve

"david" <david_perry@btconnect.com> wrote in message
news:bg86v8$6cs$1@sparta.btinternet.com...
>
> "Steve" <tiggerthefish@yahoo.co.uk> wrote in message
> news:bg81bg$oe4$1@news8.svr.pol.co.uk...
> > I have a JR 3810 ADT Radio Set. I currently remove the battery to fast
> > charge. If I make up a lead to fit the transmitter, can I fast charge
> > through this without removing the battery? How much current can you push
> > through the transmitter?
> >
> > Many thanks
> > Steve
> >
> >
>
> You aren't pushing anything thro' the transmitter as the cells are wired
> straight to the dc jack. At best / worst they#ll go thro a fuse.
>
> You can fast charge quite happily at up to 2 to 2.5 amps if the fuse will
> take it. I charge my trannies at c1.5amps all the time with a cycle every
> now and then. I had to change the fuse in the MPX tx though.
>
> david
>
>

[Peter Seddon]

Is it not the case that some trannies have a diode in series with the
external charger socket? As many fast chargers apply a pulse of discharge to
test what is going on during the charge process they may not work correctly.

There again I may be wrong!!

Regards Peter


"Steve" <tiggerthefish@yahoo.co.uk> wrote in message
news:bg81bg$oe4$1@news8.svr.pol.co.uk...
> I have a JR 3810 ADT Radio Set. I currently remove the battery to fast
> charge. If I make up a lead to fit the transmitter, can I fast charge
> through this without removing the battery? How much current can you push
> through the transmitter?
>
> Many thanks
> Steve
>
>

[Kjell Gai]

Peter Seddon wrote:
> Is it not the case that some trannies have a diode in series with the
> external charger socket? As many fast chargers apply a pulse of discharge to
> test what is going on during the charge process they may not work correctly.

I do not know of any transmitter that do not have this diode. The 3810
do have this diode and the Schulze chargers do not like it. Because of
this i have shorted this diode in my 3810.

>>I have a JR 3810 ADT Radio Set. I currently remove the battery to fast
>>charge. If I make up a lead to fit the transmitter, can I fast charge
>>through this without removing the battery? How much current can you push
>>through the transmitter?

On the 3810 you are charging thru the main switch and a security diode
so the current should be limited. I use a Schulze charger and it charges
the batteri with 800mA. And this i have done for years.

The batteri will also be a limiting factor on the charge current. There
are few high capacity cells that will fit into this transmitter and
still accept a high charge current. I think you are lucky if you can
find a suitable high capacity cell that can be charged with a current
much higher then 1.5A. In my 3810 i use some Sanyo 1100 mAh cells and
Robbe says the charge current should be limited to 1.7A.

--
Kjell Gai - news@kagai.org

[Steve]

Thanks for all the advice. I have shorted the diode and it now charges ok
through the schulze. I will also limit the charge current to 800ma that is
more than enough for what I need. Much better than the current 60ma charger.

"Kjell Gai" <news@kagai.org> wrote in message
news:3f299da8$1@news.broadpark.no...
> Peter Seddon wrote:
> > Is it not the case that some trannies have a diode in series with the
> > external charger socket? As many fast chargers apply a pulse of
discharge to
> > test what is going on during the charge process they may not work
correctly.
>
> I do not know of any transmitter that do not have this diode. The 3810
> do have this diode and the Schulze chargers do not like it. Because of
> this i have shorted this diode in my 3810.
>
> >>I have a JR 3810 ADT Radio Set. I currently remove the battery to fast
> >>charge. If I make up a lead to fit the transmitter, can I fast charge
> >>through this without removing the battery? How much current can you push
> >>through the transmitter?
>
> On the 3810 you are charging thru the main switch and a security diode
> so the current should be limited. I use a Schulze charger and it charges
> the batteri with 800mA. And this i have done for years.
>
> The batteri will also be a limiting factor on the charge current. There
> are few high capacity cells that will fit into this transmitter and
> still accept a high charge current. I think you are lucky if you can
> find a suitable high capacity cell that can be charged with a current
> much higher then 1.5A. In my 3810 i use some Sanyo 1100 mAh cells and
> Robbe says the charge current should be limited to 1.7A.
>
> --
> Kjell Gai - news@kagai.org
>

[Bill Wolff]

Actually the 3810 version is basically the same as the US JR 8103. And the
US versions doesn't have that blasted diode.

Bill


"Steve" <tiggerthefish@yahoo.co.uk> wrote in message
news:bgdkoc$r8r$1@newsg4.svr.pol.co.uk...
> Thanks for all the advice. I have shorted the diode and it now charges ok
> through the schulze. I will also limit the charge current to 800ma that is
> more than enough for what I need. Much better than the current 60ma
charger.
>
> "Kjell Gai" <news@kagai.org> wrote in message
> news:3f299da8$1@news.broadpark.no...
> > Peter Seddon wrote:
> > > Is it not the case that some trannies have a diode in series with the
> > > external charger socket? As many fast chargers apply a pulse of
> discharge to
> > > test what is going on during the charge process they may not work
> correctly.
> >
> > I do not know of any transmitter that do not have this diode. The 3810
> > do have this diode and the Schulze chargers do not like it. Because of
> > this i have shorted this diode in my 3810.
> >
> > >>I have a JR 3810 ADT Radio Set. I currently remove the battery to fast
> > >>charge. If I make up a lead to fit the transmitter, can I fast charge
> > >>through this without removing the battery? How much current can you
push
> > >>through the transmitter?
> >
> > On the 3810 you are charging thru the main switch and a security diode
> > so the current should be limited. I use a Schulze charger and it charges
> > the batteri with 800mA. And this i have done for years.
> >
> > The batteri will also be a limiting factor on the charge current. There
> > are few high capacity cells that will fit into this transmitter and
> > still accept a high charge current. I think you are lucky if you can
> > find a suitable high capacity cell that can be charged with a current
> > much higher then 1.5A. In my 3810 i use some Sanyo 1100 mAh cells and
> > Robbe says the charge current should be limited to 1.7A.
> >
> > --
> > Kjell Gai - news@kagai.org



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