2970dx Problem

[undertaker]

When I key the mic the display goes out!! What gives??{Cry_river}Its like it loses power...

 

[RADIOOMAN]

That is one of the options that could be the problem.
Where you got it hooked up at, automobile or power supply?
Does it have a fuse inline with it; If so, what is the value of the fuse?

 

[undertaker]

2 30 amp fuses which came with it. Does not matter auto or power supply... Checked the fuses both are ok..

 

[RADIOOMAN]

Do you have access to a voltmeter?
If so then put the test probes in the back of the power connector ( some people call this 'back probing') and read the voltage and then key up the radio on AM (radio connected to a antenna or dummy load) mode and see if the voltage drops very much. ( note the numbers, (actual value))
If you don't have a voltmeter then get 12 volt light bulb with wire leads on it and stick the bared ends of the leads, from the bulb, into the back of the power connector on the radio and then key up the radio again and see if the ligthb bulb dims very much.
This will reveal if it is a power supply or power lead problem. ( with a slight amount of uncertainty )
If the voltage does not dop or the bulb does not dim then the problem is almost certainly with the radio.
Feedback with the resluts will allow us to continue this trouble shooting process, if necessary.
Problem is most likely in the radio with one of the final output transistors, but let's check this first, because it is simple and easy to do.
I would look pretty silly if I took the radio apart and started trouble shooting the pa circuitry only to find out that the problem was a bad power cord crimp or connector.

 

[n0zna]

the new 2970n2 pulls about 65 to 75 amps,and dont like dk over 50wtts long...run about 35 dk and swing...200pep is fine...73 de n0zna late note, fets dont like heat...

 

[Mudfoot]

the new 2970n2 pulls about 65 to 75 amps,and dont like dk over 50wtts long...run about 35 dk and swing...200pep is fine...73 de n0zna late note, fets dont like heat...

The only 2970N2 that pulls that many amps has been peaked and tuned by Copper Electronics or some other dumbass.

That radio, if properly adjusted should pull 'well' under 30 amps. I can't recall off hand, but look at the factory specs on Rangers website.

 

[RADIOOMAN]

The only 2970N2 that pulls that many amps has been peaked and tuned by Copper Electronics or some other dumbass.

That radio, if properly adjusted should pull 'well' under 30 amps. I can't recall off hand, but look at the factory specs on Rangers website.

Good info.
Thanks

 

[undertaker]

Thanks for the help guys Im just gonna send it in for repair...

 

[hookedon6]

...Does it have a fuse inline with it; If so, what is the value of the fuse?

how would an incorrect valued fuse cause the power to go off,.....

and then allow it to come back on?

 

[undertaker]

Ok this is wierd took it out of the mobile put it on my power supply and now it is working!!!!!

 

[midnight special]

sounds like it is starving for power, my 2950dx did about the same thing you are describing, i was running thru what i had all my radio equipment with. i run the original wiring that come with radio straight to battery and never had no problem from then on. i later changed to a larger wire just to make sure. size of fuses has nothing to do with how much power that goes thru just if too much goes thru it will short out (blow) to protect equipment. just my thought 73s midnight special

 

[The Mad Scientist]

Ok this is wierd took it out of the mobile put it on my power supply and now it is working!!!!!

No it isn't weird , you answered you own question. The radio was being starved for power. You never mentioned how you had it hooked up in your mobile. so my guess would be that you were using it not directly wired to the battery, and or with to small a guage hook up wire. And perhaps to small of an alternator as well.


we need more information.

 

[Mudfoot]

That's good news.

 

[RADIOOMAN]

sounds like it is starving for power, my 2950dx did about the same thing you are describing, i was running thru what i had all my radio equipment with. i run the original wiring that come with radio straight to battery and never had no problem from then on. i later changed to a larger wire just to make sure. size of fuses has nothing to do with how much power that goes thru just if too much goes thru it will short out (blow) to protect equipment. just my thought 73s midnight special

how would an incorrect valued fuse cause the power to go off,.....

and then allow it to come back on?

Sigh.....
An incorrect value of fuse would not make it the power go off and then back on.
But, if there was a problem with the radio, like the pa section had shorted tranistors in it, and was drawing way to much current and someone had put much larger fuses in place of the original sized fuses (as someone might do in an effort to remedy the situation) then it might not blow the much larger fuses but could draw enough to exceed the power source's ability to deliver that much current and if it had the original intended value of fuses in it then it would most likely blow those.
If the power source and the associated wiring was being asked to deliver a tremendous amount of current (like what would happen if the pa section had shorted transistors in it) then the voltage available at the radio would most likely drop substantially and the radio would exhibit the same symptoms as described by the thread author.
Just a little bit of INFORMATION that helps with the trouble shooting process.