[Collins] KWM-380 Kiron adapter Help

[Dr. Gerald N. Johnson]

On Sat, 2007-06-23 at 23:00 +0930, L Ritta wrote:
> Hello Everyone,
> I need some help I have a Kiron adapter for my KWM-380 and I suspect the
> internal battery has had the fritz, but I can not tell for sure. I found a 
> possible
> replacement a M48Z12-150PC1 will this work? Which if I am correct has faster
> access times 150ns as opposed to 200ns on the original. So what are you 
> supposed
> to do when the battery in the chip goes belly up? Your comments folks, 
> please.
> 
> 73 Lee VK5ABC 
> 
If this is a battery backed RAM, the replacement has a chance of
working. Being faster is not a problem. You may need to do a master
reset to get the new memory initialized. Its been long enough for the
internal chip battery to have run down. It might be possible to diode
gate an external 4.5 volt stack of NiCad or silver cells to the Vcc pin
of the existing chip. That is sure to be workable if a power up reset
makes the radio work so long as power never fails.

-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer