[ICOM] Encoder for IC751A - main tuning

[Gary Fiber]

The radio power will keep the memories alive but 
not recharge that lithium battery as its not a rechargeable type.
I don't have a schematic handy but I would bet 
there are some steering diodes to allow for radio 
power or battery power in the memory circuit.

No the IC-735 CPU is a masked programmed device, 
almost like a ROM. Nothing needs to be done to 
keep the operating frequency range and basic settings with in the IC-735.

Many confuse the memory batteries with the IC-751 
type series where the lithium battery did back up operating frequencies.
However the battery current drain on that 
particular series is way down into the micro amps 
range on the ram board when its operating correctly.
Check the lithium battery if its 3.0 volts or 
better its just fine in the IC-735 and IC-751 series.

Gary K8IZ

At 08:51 PM 3/5/2008, you wrote:

>Gary is right about the 735.  Not to worry.  My battle-tested 735 had a dead
>battery.  It didn't hold memories, but it did work just fine after 3 years on
>the shelf.  I put a new battery in it before selling it.
>
>Gary - correct me if I am wrong, but wasn't 
>there a slight trickle current that
>kept the battery topped off if you left the radio powered up?
>
>Mike - KD9KC.
>El Paso, Tx.
>DM61rt
>
>ÌÏËÙÍ ËÁÂÅ (Molon labe. [mo-lone lah-veh] Google it)
>
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> > -----Original Message-----
> > From: icom-bounces at mailman.qth.net
> > [mailto:icom-bounces at mailman.qth.net] On Behalf Of Jim Hargrave
> > Sent: Wednesday, March 05, 2008 9:48 PM
> > To: ICOM Reflector
> > Subject: RE: [ICOM] Encoder for IC751A - main tuning
> >
> > Gary,
> >
> > I hope you are right. I have been led to believe it also
> > powers the CPU to retain some of the programming information.
> > If it only holds the memories, that might explain the long
> > life without any failures. I only use the memories for band
> > switching and have never found them empty. Maybe I'm just lucky.
> >
> > * 73's Jim W5IFP *
> >
> > >  -----Original Message-----
> > >  From: icom-bounces at mailman.qth.net
> > >  [mailto:icom-bounces at mailman.qth.net]On Behalf Of Gary Fiber
> > >  Sent: Thursday, March 06, 2008 4:08 AM
> > >  To: ICOM Reflector
> > >  Subject: RE: [ICOM] Encoder for IC751A - main tuning
> > >
> > >
> > >  Jim,
> > >
> > >  The IC-735 memory battery ONLY backs up the 10 memories
> > nothing else.
> > >  Worse thing that will happen if the memory battery goes dead in an
> > >  IC-7355 is all the memories will reset to 28.000 MHz
> > >
> > >  Gary K8IZ
> >
> > ----
> > 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
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Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident