[Motorola] "Lunchbox" PT400

[Gary Chatters]

The manuals do show up on eBay.  Item 280053912157, for which the 
auction is about to end, is a low band manual.  It is not clear exactly 
which models it covers.

There is a Yahoo! group dedicated to these radios: 
motorolaptportableradio.  It is a small group with little activity, but 
you might find some additional help there.

Batlabs has the diagram of the battery pack connections.  You could use 
this to connect up a bench supply at 14.4 volts to test the unit.  Do be 
careful with the polarity.  As I understand it, the chassis common is 
actually the positive side and you need to be sure the antenna is 
isolated from power ground (double check this).  I have soldered a 
couple of wires to a DB-9 to connect mine to a bench supply for test 
purposes.

I have one here that I plan to get going on 2M Real Soon Now.  That's a 
project for the new year.

Note that although the PT series look quite similar, the PT400 is a bit 
longer than the others, thus, battery packs and chargers for the PT300 
won't work for the PT400.

73,
Gary

Spencer Sholly wrote:
> Howdy!
>
> I am new to the list.  basically, I just have some questions about the 
> PT400.
>
> I obtained a couple of  these radios a while back & have put them up.  
> I was curious if anybody has a source for owner's manual or 
> schematics.  These seem to have been set up for 2M operation.  I don't 
> even know if they work.  The replacement batteries are like 135 bux 
> apiece.  I can't spend that much to find out the radios don't work.
>
> Any help would be appreciated.
>
> TNX es 73,
>