NX-720kh oddity

[Kitn1mcc]

I have a nx-720kh mounted in a locomotive . Runs off a 74 to 12v inverter . We run 2 channels in analog
1 160.695
2. 160.230

Radio transmits fine everytime on 1 . Go to channel 2 and transmit draws extra current and makes the power supply reset. Power cycle the Radio it is ok on both channels for a while. Also there a few other channels in there no issue.

Could a specific frequency cause that much on an issue

 

[kd4efm]

First, where's the convertor?
Second, check the ground to ground on the coax (if it's the fin antenna)
50 Watts shouldn't trip a 72-12(20amp)
Does the power panel breaker trip or the convertor breaker trip?
What convertor make?

 

[kd4efm]

And yes, I've worked on gp38-2 so I know they have a power panel break for the radio convetor

 

[Kitn1mcc]

First, where's the convertor?
Second, check the ground to ground on the coax (if it's the fin antenna)
50 Watts shouldn't trip a 72-12(20amp)
Does the power panel breaker trip or the convertor breaker trip?
What convertor make?

Its in a ge 80 tonner center cab. Does not trip any breakers or burn out fuses just resets it self. and just on that one freq. It came to use with one of those silver cheap inverters that needs to be ground isolated, I want to see if they will pay with for a wilmore .

 

[Kitn1mcc]

I put it on the bench today. It was putting out 52watts on 160.695. And almost 60 on 160.230. Kicked channel 2 down to medium power gonna try that

 

[kd4efm]

I put it on the bench today. It was putting out 52watts on 160.695. And almost 60 on 160.230. Kicked channel 2 down to medium power gonna try that

WOW NELLY, needed to adjust both to about 47 using the TEST MODE of kpg-141, never good to push the power on these, they will burn out the final! 45w - 47w is nominal for operation on high power. 10-15w on mid, 3-7w on low.
(best practices)

Set test freq 1 and 2 to your channels, program.
Go into test mode, and adjust the power out (average it) between the 2 channels and shoot for 45 to 47 watts MAX.
Let it live to see another day

 

[wd8chl]

Seconding what Evens said-I've seen people crank the output on radios up thinking it will "talk better". It doesn't. It just makes it have a shorter life span, and sometimes it does what you're describing-killing a power supply or whatever due to excessive current draw. Sometimes also it causes RF to get into other equipment, or again, the power source, and cause resets, etc.