[aprssig] Considering buying a D7 - Some Basic Questions

Greg D. ko6th_greg at hotmail.com
Tue Apr 1 00:53:15 EDT 2008

Hi Steve,

If you charge the battery from a wall-wart, the plug goes into the D7 body, and from there to the battery.  There are two battery contacts in this path, so it must be a low-current (theoretically floatable) charge rate.

The drop-in charger contacts the battery back directly, and there are three contacts on the battery for this.  I presume this means that it's a fast charge, with automatic cutoff, though I'm not sure on the charge time.  I got mine n-th hand (n is more than two), and don't have the manuals for the chargers.

Greg  KO6TH

> Date: Sun, 30 Mar 2008 19:47:02 -0700
> From: noskosteve at yahoo.com
> To: aprssig at lists.tapr.org
> Subject: Re: [aprssig] Considering buying a D7 - Some Basic Questions
> Brian, Jason, Derek, 
> RE:
>>>  Not exactly correct.
>> I guess technically, [snip] you're right and I'm wrong.
>> ...can I transmit with, ...I've had my battery go dead 
>> while on the charger factory wall-wart, with
>> the radio and TNC on.
> ITEM 1:
>    Relax, friends.  There is no right vs. wrong.  I understand all the answers
> that were given and the context in which they were given.  I saw no errors
> except in the way I asked the question.  I appologize for seeding the
> confusion.
> These answers:
> A - Can't Tx on the wall-wart
> B - Can, on low power.
> C - Charger jack is also external power.
> D - on "EL" ...The 'net' current flow was in  favor of actually charging.
>   Along with the fact that there are both a cig-liger adapter and a power cord
> accessory tell me that the charging algorithm has to be something akin to a .1C
> (or maybe .16C is a better estimate from the specs and info posted) constant
> current type.
>    The reason I asked this (poorly worded) question was because I see there is
> a "Rapid Charger" listed as an accessory for the D7 - and wondered if the
> battery was charged _in_ the radio or if the battery is normally put into an
> external charger.  
>     However, no one answered the question about the timing of the charge which
> is something I was trying to determine.    The "Tx on charger" question was
> just an afterthought to get some idea of the wall wart capacity.
> The heart of my question:
> Cadmium chemistries need managing, different from Lead and Lithium.  You can't
> float them.
> What determines when the D7 battery is charged and terminates the charge??  
> A - Is there a third contact on the battery which the reado uses for charge
> sensing?
> B - Does the radio terminate the charge after some (16) hours?  and/or
> C - Is the Ham required to manage battery charging (level vs. time)?
>     Now, I well know that Li-Ions have a completely different charging
> algorithim (I know what it is, so no need for anyone to explain)... However,
> The TH-F6A uses LEDs to indicate when the battery is charging and they go out
> when the radio thinks the Li-Ion is charged.  It has a Li-Ion charging IC to
> manage the process, so I was wondering if the D7 has any charge management
> capability, or os ot just constant current and time.
> ITEM 2:
>> [snip] the AA battery pack may not give you full power. ...
>    Since it holds 4 AA's, this is a given (6v. vs. 9v)
>>  ...you will never see the  difference...
>   Also a given.
>> [battery} (at least on the early models) died in not much over a year. 
>    I wonder if this is/was related to the charging algorithm not being optimal.
> Whew!
> -- 
> 73, Steve, K9DCI
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