Motorola 900 300w Cell Amp
Posted: Wed Feb 04, 2004 7:34 am
I just bought a 900mhz 300W cell amp on ebay (actually, it's cell band, not 900, but whatever).
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... %3AIT&rd=1
I'm wondering if anyone has played with one of these, and if so, what have you discovered?
The auction says that the circulators on the output are spec'd for up to 904, which is, I think, my first obstacle. Can anyone tell me: Will they go up to 927 without adverse effects? If not, can I bypass them without adverse effects? I will be running an isolator between the amp and the cans...
What all does the control board do in this thing, and what do I need to do to interface to it, or do I just need to pull the board and build my own control circuitry? If I can leave the control circuitry in place, does anyone know where I can get one of the weird little connectors?
My goal is to rig this thing to put out about 110-125w. It would seem to me that I could remove the VCC line from the two sections on the right side and be good to go on that, and I could then fine tune my power output with my drive level.
From disabling half of the amp, this thing should run pretty cool. If it is rated at 300w, it would be able to do that continuous duty, so running only half the amp, I don't expect heat issues... (Plus I'm going to add a rather heavy fan with thermistor...
If anyone has got some info on this thing, please let me know.
Also, if anyone knows where I could dig up a big enough 28v power supply, I'd appreciate it. (I would probably need about a 20A, I should think...)
THanks,
John
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... %3AIT&rd=1
I'm wondering if anyone has played with one of these, and if so, what have you discovered?
The auction says that the circulators on the output are spec'd for up to 904, which is, I think, my first obstacle. Can anyone tell me: Will they go up to 927 without adverse effects? If not, can I bypass them without adverse effects? I will be running an isolator between the amp and the cans...
What all does the control board do in this thing, and what do I need to do to interface to it, or do I just need to pull the board and build my own control circuitry? If I can leave the control circuitry in place, does anyone know where I can get one of the weird little connectors?
My goal is to rig this thing to put out about 110-125w. It would seem to me that I could remove the VCC line from the two sections on the right side and be good to go on that, and I could then fine tune my power output with my drive level.
From disabling half of the amp, this thing should run pretty cool. If it is rated at 300w, it would be able to do that continuous duty, so running only half the amp, I don't expect heat issues... (Plus I'm going to add a rather heavy fan with thermistor...
If anyone has got some info on this thing, please let me know.
Also, if anyone knows where I could dig up a big enough 28v power supply, I'd appreciate it. (I would probably need about a 20A, I should think...)
THanks,
John