connection consideration of a 500W RF amplifier
connection consideration of a 500W RF amplifier
(OP)
Hi, everyone:
We recently got a 500W Power amplifier.My job is to set it up. From instructions we need a power supply that gives 30V, 80A, This PA has four 30V bias inputs, we are instructed to connect these four inputs individually to the power supply through 4 feedthrough capacitors, and connet 4 at least 1800uF capacitors as well to the 4 PA inputs. Do you think it's really necessary? I mean all these capacitors? I don't have much experience on this. The max. power I even handled on PA is 200W, and I didnot need capacitors at 200W level to operate it.
Thanks in advance!
bj
We recently got a 500W Power amplifier.My job is to set it up. From instructions we need a power supply that gives 30V, 80A, This PA has four 30V bias inputs, we are instructed to connect these four inputs individually to the power supply through 4 feedthrough capacitors, and connet 4 at least 1800uF capacitors as well to the 4 PA inputs. Do you think it's really necessary? I mean all these capacitors? I don't have much experience on this. The max. power I even handled on PA is 200W, and I didnot need capacitors at 200W level to operate it.
Thanks in advance!
bj





RE: connection consideration of a 500W RF amplifier
Yes.
Follow the vendor's instructions carefully. It's common for amplifier modules and subassemblies to be damaged during the intial stages of integration.
RE: connection consideration of a 500W RF amplifier
Keith Cress
Flamin Systems, Inc.- <http://www.flaminsystems.com>
RE: connection consideration of a 500W RF amplifier
Problems are more common during initial integration because the bench test setup probably isn't as well bypassed as would be a final product. Long ground wires etc.
RE: connection consideration of a 500W RF amplifier
The suppliers of that module have obviously done some pretty thorough testing, and have perhaps discovered certain instability problems can sometimes arise. If they say these precautions are required, do it without hesitation.
Also make sure your feedthrough capacitors are physically large enough to carry considerable RF and dc current without overheating or self destructing. They may be able to advise you on a suitable supplier and part number.
RE: connection consideration of a 500W RF amplifier
hmmmm.
Keith Cress
Flamin Systems, Inc.- <http://www.flaminsystems.com>
RE: connection consideration of a 500W RF amplifier
I thought that I had the franchise on this kind of confusion.
I wondered a little until I realized that PA was Power Amp, not Public Address. Check the title of the post.
respectfully
RE: connection consideration of a 500W RF amplifier
Now where were those apology forms...
Hey, my son's room is filled with audio power amplifiers..
Keith Cress
Flamin Systems, Inc.- <http://www.flaminsystems.com>
RE: connection consideration of a 500W RF amplifier
Still..... A wideband power amplifier is still a wideband power amplifier, and the problems do not just all go away because it is built for audio frequencies.
I believe all the above comments are still most appropriate dispite the confusion.