Take note, the battery losing connection from the electrical system when under full charge - very dirty or loose connection or an intentional disconnect - can dump over 100VDC to your electrical system. At work we call it a Load Dump. In a vehicle certain items have protections against this, others don't. Those that don't only benefit slightly from the protection the others have. NOTE: I work in the EMC dept at FCA. Also I've had an idiot mechanic replace the alternator in my Durango and afterward, while running, he disconnected the battery for some reason. Result: radio fuse blown, satellite tuner fuse blown, instrument cluster blown - dealer had to replace that at their own cost.
Vince.
toggle quoted message
Show quoted text
On 07/19/2017 09:47 AM, Raj vu2zap wrote:
During my service time and experience I considered that all portable /
Automobile rigs like
FT757/747 & all 12V rigs designed to be used in an automobile can handle
up to 15V.
All caps very rated 16v/25v. Occasionall I saw a fried tantalum cap.
An old battery with an over zealous charger circuit can be pushed to 14+
volts.
When first testing BITX40 stay away from a lead acid battery because it
can source a
huge current and any goof will result in massive smoke.
My old analog BITX40 can handle 14+ volts, I am now using 13.8V.
Raj
At 19-07-2017, you wrote:
Imagine the full charged lead acid battery? voltage reaches? to 13.5
or 13.8V.
I suppose that 13.xx is called for from that aspect.
sarma
? vu3zmv
On Wed, Jul 19, 2017 at 5:27 PM, Michael Babineau
<mbabineau.ve3wmb@... <mailto:mbabineau.ve3wmb@...>> wrote:
Curt :
Glad to hear that you are up and running with the new Bitx40.
My suspicion is that 13.8 v may have been too much for the previous
One. I have seen a few people suggest 13 v max, though I am not
sure where that number comes from. It seems like maybe the display
is fried on the old Raduino. Now that you have a working rig you
might be able to use that to help diagnose the old one (ie you
could try putting the old display on the new raduino).?
Best of luck and above all ... have fun!
Cheers?
Michael VE3WMB
--
Michigan VHF Corp.
