Hi all,
I am having some issues with my PM 1500 remote mount.
1. When I take it off of scan, it will not receive that channel unless I transmit a message first.
2. The radio turns off by itself out of no where. (I checked the connections).
** I believe there may be a power issue with the vehicle, because the radio cuts out the siren when the radio transmits but i do not think this would be causing issue 1 and/or 2. Thanks for your help. Any ideas?
pm1500 issues
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jmr3865
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pm1500 issues
JMR
KC2QVO
KC2QVO
Re: pm1500 issues
There was a firmware upgrade for the PM1500 about 2 years ago or so. It was shortly after them went out to the
field. Anyway, what would happen is it would receive the first transmission fine. But it would not hear the second
transmission in the tone squelch mode. If you take the radio out of scan, it would hear all the transmissions fine.
I think I have described the sequence of events causing the radio not to hear a transmission.
The above may not be your problem, but there was a service bulletin put out on this. Radio had to be flashed
with a new firmware upgrade and the problem went away.
As for the radio turning off, I think I would start using a volt meter and looking for low voltage. The radio will
do strange things on low voltage. Start the vehicle and measure the battery voltage with nothing turned on.
Make sure you measure both the actual battery post and the connector. A dirty battery connector will cause
all sorts of wild problems. Then start turning on the electrical load normally in the vehicle. Headlights on low
beam, then on high beams. Turn on the fan motor, then the air conditioning. All the time keeping an eye on the
voltmeter at the battery. Don't forget the windshield wipers.
If the alternator is bad, you will see a drop in voltage as the current is increased with the additional loads. The
trick here is to find out if you have a bad alternator. If the voltage does drop down some, try increasing the
idle speed of the engine slightly and see if the voltage stays low or goes back to a normal voltage. The magic
numbers here are to stay above 13.0 to 13.8 volts or so. This way your always keeping the battery charged.
I have seen some large agency auto repair shops lower the normal idle point on the vehicles as a way to save fuel.
They forget that the electrical system is part of what keeps that vehicle on the road. Got to have the volts to
keep the engine alive. This really comes into play with lightbars on emergency vehicles. Low voltage will cause
today's new solid state computer controlled radios to do flip flops. That voltage needs to stay up.
Maybe this will give you a few ideas on what to look for. Don't forget that you could have a poor fuse connection
or a wire splice. Under a no load condition, the voltage measures good. As soon as you start pulling much
current through, the voltage takes a nose dive.
Jim
field. Anyway, what would happen is it would receive the first transmission fine. But it would not hear the second
transmission in the tone squelch mode. If you take the radio out of scan, it would hear all the transmissions fine.
I think I have described the sequence of events causing the radio not to hear a transmission.
The above may not be your problem, but there was a service bulletin put out on this. Radio had to be flashed
with a new firmware upgrade and the problem went away.
As for the radio turning off, I think I would start using a volt meter and looking for low voltage. The radio will
do strange things on low voltage. Start the vehicle and measure the battery voltage with nothing turned on.
Make sure you measure both the actual battery post and the connector. A dirty battery connector will cause
all sorts of wild problems. Then start turning on the electrical load normally in the vehicle. Headlights on low
beam, then on high beams. Turn on the fan motor, then the air conditioning. All the time keeping an eye on the
voltmeter at the battery. Don't forget the windshield wipers.
If the alternator is bad, you will see a drop in voltage as the current is increased with the additional loads. The
trick here is to find out if you have a bad alternator. If the voltage does drop down some, try increasing the
idle speed of the engine slightly and see if the voltage stays low or goes back to a normal voltage. The magic
numbers here are to stay above 13.0 to 13.8 volts or so. This way your always keeping the battery charged.
I have seen some large agency auto repair shops lower the normal idle point on the vehicles as a way to save fuel.
They forget that the electrical system is part of what keeps that vehicle on the road. Got to have the volts to
keep the engine alive. This really comes into play with lightbars on emergency vehicles. Low voltage will cause
today's new solid state computer controlled radios to do flip flops. That voltage needs to stay up.
Maybe this will give you a few ideas on what to look for. Don't forget that you could have a poor fuse connection
or a wire splice. Under a no load condition, the voltage measures good. As soon as you start pulling much
current through, the voltage takes a nose dive.
Jim
jmr3865 wrote:Hi all,
I am having some issues with my PM 1500 remote mount.
1. When I take it off of scan, it will not receive that channel unless I transmit a message first.
2. The radio turns off by itself out of no where. (I checked the connections).
** I believe there may be a power issue with the vehicle, because the radio cuts out the siren when the radio transmits but i do not think this would be causing issue 1 and/or 2. Thanks for your help. Any ideas?
Re: pm1500 issues
Oh come on Jim - copper oxide conducts. And it's such a pretty green. Hate to ruin that.
"Beel - we done checked everthing on that truck. It got a good fuze. When we tap the battery post with the main lead we get a spark. The ground wahr is tight. The test light sez the ignition is good. We just don't know. Need you to take a look at it."
mkay. Dogz on the scent.
"Beel - we done checked everthing on that truck. It got a good fuze. When we tap the battery post with the main lead we get a spark. The ground wahr is tight. The test light sez the ignition is good. We just don't know. Need you to take a look at it."
mkay. Dogz on the scent.