JRC JHP500 handheld transceiver

[bluenosepiperflyer]

I have been trying to find the operator's manual or other documentation
for this unit on the web, but have not succeeded. If anyone can direct
me to a spot on the web where I can download it, I would be grateful.
Thanks.

[Scott Migaldi]

bluenosepiperflyer wrote:
> I have been trying to find the operator's manual or other documentation
> for this unit on the web, but have not succeeded. If anyone can direct
> me to a spot on the web where I can download it, I would be grateful.
> Thanks.
>
I have an owners manual. Contact me and I can arrange to get it to you.

--
--------------------
Scott F. Migaldi
CP-ASEL-IA
N8116B

PADI MI-150972
Join the PADI Instructor Yahoo Group
http://groups.yahoo.com/group/PADI-Instructors/

--------------------

[Robert M. Gary]

I also have the same unit. Is there any reasonable way to replace the
original rechargable battery?

[john smith]

> I also have the same unit. Is there any reasonable way to replace the
> original rechargable battery?

If it is a detachable battery pack, there are several suppliers that can
swap the old pack for a new. I replaced a NiCd pack for a NiMH on an
ICOM.

[Robert M. Gary]

> If it is a detachable battery pack, there are several suppliers that can
> swap the old pack for a new. I replaced a NiCd pack for a NiMH on an
> ICOM.

Where did you go? I'd love to try that.

[john smith]

In article m>,
"Robert M. Gary" > wrote:

> > If it is a detachable battery pack, there are several suppliers that can
> > swap the old pack for a new. I replaced a NiCd pack for a NiMH on an
> > ICOM.
>
> Where did you go? I'd love to try that.

I cannot remember which one. I checked prices at AirVenture and bought
the one with the best price. Look in any of the aviation mags, they
usually have ads. If you cannot find any there, I will look for my
business cards.

[Mike W.]

Lots of places re-cell battery packs.

http://www.batteriesplus.com

http://store.batteryspecialists.com

http://www.asisco.com/battery_rebuiltpacks.htm


"Robert M. Gary" > wrote in message
ps.com...
> > If it is a detachable battery pack, there are several suppliers that can
> > swap the old pack for a new. I replaced a NiCd pack for a NiMH on an
> > ICOM.
>
> Where did you go? I'd love to try that.
>

[Dan Youngquist]

On Tue, 25 Oct 2005, Robert M. Gary wrote:

> I also have the same unit. Is there any reasonable way to replace the
> original rechargable battery?

The battery packs from my Cherokee handheld CB's fit my JHP-520. When
those are worn out, I have AA battery packs that I'll use with NiMH cells.
That seems to me like a much better idea than dedicated battery packs that
are difficult and/or expensive to fix -- individual cells are easily &
cheaply replaceable when they die, and they're interchangeable with GPS,
flashlights, etc.

-Dan

[Greg Copeland]

On Wed, 26 Oct 2005 00:24:34 +0000, john smith wrote:

>> I also have the same unit. Is there any reasonable way to replace the
>> original rechargable battery?
>
> If it is a detachable battery pack, there are several suppliers that can
> swap the old pack for a new. I replaced a NiCd pack for a NiMH on an
> ICOM.

Be careful when switching to alternate battery technologies. NiCads are
designed to be charged at rates up to 3C while most NiMH are
typically designed to be charged no faster than 1 to 1.2C. As a rule of
thumb, NiCads charge FAST while NiMH charge slow but have much
larger capacities. Another important distinction between the two battery
types, when peak charging, each battery type indicates "full" differently.
Long of the short, if you change battery technologies, make sure you
change chargers too! Otherwise, you may be in for a surprise including
very short battery life, batteries which never hold a full charge, and
maybe even fires.


Greg

[David Dyer-Bennet]

Greg Copeland > writes:

> On Wed, 26 Oct 2005 00:24:34 +0000, john smith wrote:
>
> >> I also have the same unit. Is there any reasonable way to replace the
> >> original rechargable battery?
> >
> > If it is a detachable battery pack, there are several suppliers that can
> > swap the old pack for a new. I replaced a NiCd pack for a NiMH on an
> > ICOM.
>
> Be careful when switching to alternate battery technologies. NiCads are
> designed to be charged at rates up to 3C while most NiMH are
> typically designed to be charged no faster than 1 to 1.2C. As a rule of
> thumb, NiCads charge FAST while NiMH charge slow but have much
> larger capacities. Another important distinction between the two battery
> types, when peak charging, each battery type indicates "full" differently.
> Long of the short, if you change battery technologies, make sure you
> change chargers too! Otherwise, you may be in for a surprise including
> very short battery life, batteries which never hold a full charge, and
> maybe even fires.

All my NiMH chargers claim to be able to charge NiCD batteries too;
are they lying to me? Or are there big compromises? This is
completely intellectual curiosity, since haven't used any AA NiCD
batteries in years.
--
David Dyer-Bennet, >, <http://www.dd-b.net/dd-b/>
RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/>
Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/>
Dragaera/Steven Brust: <http://dragaera.info/>

[Greg Copeland]

On Mon, 30 Jan 2006 10:40:05 -0600, David Dyer-Bennet wrote:

[snip]
>
> All my NiMH chargers claim to be able to charge NiCD batteries too;
> are they lying to me? Or are there big compromises? This is
> completely intellectual curiosity, since haven't used any AA NiCD
> batteries in years.

Well, you really didn't provide enough information to say one way or
another. But chances are, you're safe as along as it says it supports the
battery type. My own high-end DC charger must be told the type of battery
it is charging, when it is charging in peak mode. I suppose it's possible
that a charger can automatically detect both types of fall-off but it may
run a higher risk of a false positive. Keep in mind, that's a guess on
my part. Assuming it's peak charger, a false positive would mean the
battery did not get charged to capacity.

If it is a trickle charger, a false positive/negative means it's either
over or under charged. And frankly, trickle chargers are well known for
over charging batteries. Over charging a battery can result in everything
from simple cell damage (reduced capacity and lower supported discharge
loads) to an actual fire. Also, don't forget that damaged cells may cause
a fire during high load discharge cycles too. Which is to say, an
undamaged cell versus a damaged cell, is more prone is be a victim of
excessive heat build up, during high load cycles. Lastly, "high load" is
largely dependant on both the type of cell. Remember, not all rechargable
cells are equal.

As a rule of thumb, given your cells, if your cells are hot to the touch
during and immediately after use, the application is probaly high load for
them. Likewise, if during charging, your batteries are getting hot to the
touch, long before the charge cycle is complete, you might question if the
battery is being over charged...especially if it's a trickle charger.


Greg

[Dan Youngquist]

On Mon, 30 Jan 2006, Greg Copeland wrote:

> Be careful when switching to alternate battery technologies. NiCads are
> designed to be charged at rates up to 3C while most NiMH are
> typically designed to be charged no faster than 1 to 1.2C.

Can you back this up with some documentation? I'm not an expert, just a
relatively well informed user, but this runs counter to everything I've
read. The rule of thumb for most common battery chemistries is C/10 (1/10
the amp-hour rating) for 12 hours. As far as I'm aware there's no way to
safely (that is, without damaging the cells) speed that up significantly
without microprocessor controlled chargers and special waveforms. Even
with those things I doubt it's possible to charge NiCd's or NiMH's
anywhere near as fast as you suggest (20 min. to 1 hour) without severely
shortening their lifespan. Take care of your batteries, and you might
actually get the 1000 charges the manufacturers advertise; abuse them, and
you might get only a dozen or so charges.

In short, get an extra set or two of batteries, charge them slowly, don't
ever overcharge them, and they'll live a lot longer.

> Long of the short, if you change battery technologies, make sure you
> change chargers too! Otherwise, you may be in for a surprise including
> very short battery life, batteries which never hold a full charge, and
> maybe even fires.

To the contrary, all information I've ever come across indicates the
charge cycles are identical for NiCd and NiMH. In other words, they're
completely interchangeable, assuming of course that one accounts for the
different capacity when charging. NiCd's are lower capacity (usually
_much_ lower), so generally, NiMH's can be safely charged in chargers
designed for NiCd, but the reverse isn't necessarily true.

For some years I've been using NiMH's in cordless phones designed for
NiCd's, with absolutely no problems. Battery life between charges is much
longer with NiMH's, and lifespan is also much greater because of NiCd's
memory effect.

-Dan