PM400 Low Battery Alert

mnl001 · Post by **mnl001** » Wed Mar 07, 2007 12:07 pm

Has anyone had any experience with low battery alerts for the PM400. In particular I am looking for a work around for the transmit inhibit

ard099 · Post by **ard099** » Wed Mar 07, 2007 4:38 pm

The low battery alert is there for a reason, to tell you that the battery is low. A poor power connection can sometimes create the alert also. And as far as the transmit inhibit, are you referring to the inhibit with the low battery alert or something else?

mnl001 · Post by **mnl001** » Thu Mar 08, 2007 1:45 pm

We have clients that are finding they cannot transmit from the PM400 while they can from the CDM series, the M1225, GM300 and so forth.

They can start a tandom truck, but cannot call for help if they run into problems. This is why I am looking for a work around.

In the CDM you can at least use the global tuner to assist in this.

ard099 · Post by **ard099** » Thu Mar 08, 2007 2:49 pm

Ok, I see. Well let me ask you this, what is the voltage level at the plug when the radio gives you the low battery alert? And what is the voltage at the battery? My gut feeling is that you might have to find another power connection, or get some new batteries, but then again the newer radios are essentially computers with rf jacks and it could be a bug with the low battery alert. You could also change the power setting to low and see if that makes a difference. I'm not sure what the minimum operating voltage is but you could probably set it up on the bench and find out.

mnl001 · Post by **mnl001** » Thu Mar 22, 2007 5:29 am

Found one resitor, changed value and I can tx down to 8.75 volts

arlojanis · Post by **arlojanis** » Fri Mar 23, 2007 5:43 am

What is the ID of the resistor and where is it located?

PM400 Low Battery Alert

PM400 Low Battery Alert

Low Battery Alert

Fix found for PM400 battery alert