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  • Users: bjbdts
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  1. bjbdts

    1 1/2-20 thread male connection

    Hi everyone: I have a laser sight accessory with a female 1 1/2-20 thread connection. I'm searching for a male 1/1/2-20 thread of anything (rod,pipe,adapter) such that I can mount this laser sight to a fixture. Any help will be appreciated. Thanks, bjbdts
  2. bjbdts

    Can electrically conductive silicone rubber block microwaves?

    Hi everyone: I'm working on a microwave chamber design(2.45GHz). The chamber needs to be pumped down to a certain vacuum level, at the mean time needs to be microwave safe. I'm wondering if anybody here has experiences about using electrically conductive silicone rubber in order to meet the...
  3. bjbdts

    spikes caused by the cooling fans

    Hi, everyone: I'm using a temperature sensor to monitor the temperature of our sample. The temperature reading is shown in my computer. the sensor is powered up by a 12V regular power adapter. It's working OK until I connect a couple of 12V DC cooling fans to the circuit. They are powered up by...
  4. bjbdts

    Max. amps and hp rating for electrical switch

    Hi, everyone: I need a switch to turn on/off a 2500W power supply(single phase) from wall outlet (220Vac). When I look at the specs of related product I get a little confusion: Why the manufactures give Max. amps at 240VAC/600VAC, but at the same time MAX. horse power. By just looking at the...
  5. bjbdts

    recommendation of S parameter measurement service

    Hi, everyone: I have a few samples that need to do S parameter measurements up to 10GHz, and wondering if you can give me any recommendation on companies who provide this service? Thanks in advance. bj
  6. bjbdts

    X ray service, fine focus

    Hi, everyone: I'm trying to find a X ray service that can produce high resolution photos to show the soldering bump and pad bonding quality. I heard of a company called "fine focus", but strangely I cannot find it from internet. Does anybody here know it? I'd appreciate very much if you can tell...
  7. bjbdts

    Energy in microwave cavity

    Hi, everyone: I'm desining two circular cavity resonators. The size of the two cavities are different from each other, but the unloaded Q is same, i.e. a1/d1=a2/d2. The dominant mode is TM010. I'm trying to figure out the relationship of amplitude of the Electric field between each cavity. The...
  8. bjbdts

    S parameter measurement service?

    Hi, everyone: I'am looking for reliable companies that provide S parameter measurement service. We have some chips (packaged and unpackaged)that we would like to compare and check the influence of our packaging technique. Any recommendation is appreciated. thanks in advance. bj
  9. bjbdts

    Root cause of RF power amplifier failure?

    Hi, everyone: We had a RF power amplifier with 500W CW output @ around 2GHz. The last stage of the amplifier is an isolator that's supposed to handle 1000W power. The output connector is a N type female. We use a semirigid cable RG401 with N Male connector to connect the PA output power to a...
  10. bjbdts

    read data file

    Hi, I am trying to read a .txt data file. But somehow can only get "''". Below is my code of write file, and then read file. %write data: x=0:0.1:1; y=[x;exp(x)]; fid=fopen ('C:\exptab.txt', 'w'); %fprintf(fid,'Exponential function\n'); fprintf(fid, '%6.2f %12.8f\n',y); fclose (fid); %read...
  11. bjbdts

    How to get index number of an element in an array

    Hi, I'm calculating a frequency response of a variable. So basicly I have an array of frequency, and I have a corresponding array of the variable. My question is how can I get the index number of the maximum value of the variable? Is there a simple command? Thanks for your help. bj
  12. bjbdts

    coaxial triple stub tuner

    Hi, everyone: I am trying to find an appropriate coaxial triple stub tuner to tune the load impedance (antenna+microwave applicator) to microwave source. The power is a few hundred watts up to 1KW. Frequency is about 2.4GHz. Typing in "triple stub tuner" in google didn't give me much information...
  13. bjbdts

    Mylar photo mask maker?

    Hi, everyone: My new project involves designing photo masks for device fabrication. The minimum dimension of my mask is 25um. Mylar masks are supposed to be cheap, but somehow one company I contacted wanted to charge me $150 for one sheet. Do you know any good mylar photo mask maker? Thanks, bj
  14. bjbdts

    connection consideration of a 500W RF amplifier

    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...
  15. bjbdts

    make a video from picture files

    I have a few pictures of our sample appearance changing with time and would like to make a video for presentation. Could you tell me how to do it? which software(s) I should use? thanks, bj
  16. bjbdts

    Peak power of a circulator

    Hi, everyone: I am a little confused about the power specifications about a RF circulator: The Avg value can be so much difference from the Peak value, for example, a circulator with avg 150W, its peak value can be 750W. So if I need a 200W circulator, can I use the circulator with avg 150W and...
  17. bjbdts

    DAQ reading problem

    Hi, I am using a DAQ board to read the voltage across a load cell to a computer. I also have a 2.2-2.5GHz power amplifier sitting close to the DAQ board. My problem is when the amplifier is on, my DAQ reading to the computer shifts about 6mV, which means with nothing attaching to it, my labview...
  18. bjbdts

    Need to rent a power supply

    Hi, everyone: I need to rent a power supply. Output Voltage=24-26V, current abuot 60A. Any recommendation is appreciated. thanks bj
  19. bjbdts

    Good Thermal cycle companies?

    Hi everyone: My project is to investigate the bonding quality of our samples. It's silicon wafer to Cu bonding with AuSn, The size is about 20*20 mm^2. First I plan to thermal cycle the samples. So I am wondering if anybody here knows any good thermal cycle companies. Thanks
  20. bjbdts

    Power supply/voltage regulator

    Hi, all I am trying to find a DC power supply/voltage regulator with high accuracy, for example for 0-10V range, the accuracy need to be several mV. I know one company bk precision with the required accuracy (about 8mV), but I really don't want the "horns and whistles", and want to get the...

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