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Galaxy 225
- Thread starter RunAway15
- Start date
We have a winna!
What does it have in it? 1446's? No more than 10w/peak AM into it should make it last and work right. At 13.8v feed voltage, you should see about 150~160w output/peak.
What does it have in it? 1446's? No more than 10w/peak AM into it should make it last and work right. At 13.8v feed voltage, you should see about 150~160w output/peak.
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It probably won't last long with a Connex doing 30-40w pep. I'd say turn it to low setting, but you'll just burn up the resistor used to swamp/bleed off drive.
I run a ratshaq meter in line with all my stuff, and I watch it closely. Right now I'm putting about a watt DK into it (about a 20 watt carrier from the box, could be a little higher like 30-35 I suppose but that's what it was doing when I put the two together and it sounds good so didn't see any reason to take the lid off the radio for that) and if the resistor goes I would see the DK change, right?
I think you were closer to the output estimate you first reported before you edited it when you said 175. This little box is hot!! It may be closer to 185-195!!!
You may well be over-driving it if it getting real hot.
I have the same box, but have not run it in awhile. Cannot remember what it did exactly. I think it uses a 75w device @12.5vdc. So two should do 150 to 175w output @13.8vdc with 10w/PEP input - using a 50 ohm dummy load to measure the output..
I have the same box, but have not run it in awhile. Cannot remember what it did exactly. I think it uses a 75w device @12.5vdc. So two should do 150 to 175w output @13.8vdc with 10w/PEP input - using a 50 ohm dummy load to measure the output..
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Lol, I should have chose my wording more carefully. I didn't mean temperature hot, but fire in da wire hot. Lol.. In fact its been running rather cool. Not getting hot at all. Here comes a question that may seem green; is heat my only worry, or can things go wrong even with relatively little heat?
What can go wrong?
Good question.
You could accidentally turn up the output on your Connex to exceed 10wPEP to 30w/PEP. Then it could be days, hours, or minutes before the finals in the amp to overheat and destroy themselves. Remember, that radio puts out +50w/PEP; but on the low side you best check that radio with a dummy load and a reliable watt meter to be sure that it isn't putting out more than 10w/PEP. Your amp's life depends on it.
If your radio puts out more than that on the lo power setting; then you would be best served to lower the dead key of the radio internally until it falls into that specification. Keep in mind we are talking about peak watt output.
Too much mic gain can also cause the amp to amplify any radio IMD distortion products, so keep it as clean as you can. This over-modulation will also give the amp distress.
Good question.
You could accidentally turn up the output on your Connex to exceed 10wPEP to 30w/PEP. Then it could be days, hours, or minutes before the finals in the amp to overheat and destroy themselves. Remember, that radio puts out +50w/PEP; but on the low side you best check that radio with a dummy load and a reliable watt meter to be sure that it isn't putting out more than 10w/PEP. Your amp's life depends on it.
If your radio puts out more than that on the lo power setting; then you would be best served to lower the dead key of the radio internally until it falls into that specification. Keep in mind we are talking about peak watt output.
Too much mic gain can also cause the amp to amplify any radio IMD distortion products, so keep it as clean as you can. This over-modulation will also give the amp distress.
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Decent little amp for the money, that said your radio is pretty strong for that amp. Your dead key input is ok but your peak wattage from the radio is probably too strong. You might add a fan to the heat sink on the amp to help keep it cool. Here are what those finals will cost if/when you smoke em.
https://www.rfparts.com/rftransistors/transistor-sd/sd1446.html
https://www.rfparts.com/rftransistors/transistor-sd/sd1446.html