its a new ps but it gets realy hot on the bottom and the fan has never come on,the lites on the meters dim with a whistle on the mic ,even on low power of the radio..is this normal ? the radio is a 2970n2 200 watts. seen on the back of the ps a bolt 2 nuts and star washers and the word chassi by it ..is this for a ground wire ? is it possible there is a fuse for the fan that has blown .. noticed also the bottom of the ps gets hot but the heat sinks on the ps stay cool..
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astron 70 amp ps. problem
- Thread starter Splash1
- Start date
when we run astrons on 240v 50hz mains the transformer gets hot even without any load on the psu, the case under the transformer can often be much warmer than the heatsinks,
be carfull messing with the fan, it is powered from mains voltage,
some info and schematics,
Index of Astron™ Power Supply Information at www.repeater-builder.com
be carfull messing with the fan, it is powered from mains voltage,
some info and schematics,
Index of Astron™ Power Supply Information at www.repeater-builder.com
I had the same problem with mine running hot and the fan not starting. I jumped out the thermal switch or thermostat so the fan runs all the time. Now its cool to the touch. Gets luke warm under load. That lug mark chassis should be connected to your station ground.
The problem could be there are too many services running off the same transformer, to check set a volt/ohm meter to ac mode at a range that will read at least whatever your line voltage is and test your ac line/supply voltage at the breaker box when the radio is under load and see if your voltage drops significantly and if so then call your power company and explain your findings.
If you're saying that the lights on the radio dim under power that is just a fault of the rci line off radios, mine does that also.
Well I wouldn't worry about that if your house lights are not dimming.
A 70 amp supply will run that radio no problem especially since the radio only uses 14 amps or less.
Then the meter is obviously wrong or you have a defective ps, do the math, 200 watts divided by 13.8 volts is only 14 amps @ 100% efficiency.
Sounds like the supply has bad regulation. Could be one of the series pass transistors is leaking. I have several Astrons and none dim. Even pulling half the load.
DXman
Yes, that's 3100 degrees F. Nine yrs of hard work.
Mack,
The n2 model radio will draw over 45 amps just modulating (this is on ssb)
I can not run my 2970n2 at full power using a 50 amp supply set @ 14.1, the radio will shut down.
It's no problem on AM, it draws around 28 amps if I remember right.
up date..called astron co. today and they told me its normal for the lites to dim as the lites are wired befor the regulation and or the transformer..he said its also normal for the bottom to get hot and the fan not to come on..he said the fan wont come on untill the heat sink by the meter gets to 140 degres..the bottom of mine gets hot but the sinks have always been cool....so,, if anyone has one of these and you were worried about the symptoms i had,,i guess its nothing to worry about..so i guess i gotta eat my words bout ''buyer beware'',,mmmmm, they kinda taste like chicken..
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Doesn't matter what kind off radio it is, 200 watts is 200 watts and unless it's @ - efficiency 200 watts only draws 14 amps or so @13.8 volts.
My ts-430s kenwood uses less than 20 amps @ 200 watts in ssb mode and that's on a astron rs-20a power supply now debunk that.