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Recent content by krytar

  1. krytar

    Need a voltage regulator/converter... for a TTL line ckt

    Hi All, I'm designing a SP8T Switch for a switch filter bank. There are 3 TTL lines (A2 A1 A0) from the decoder. In oder to put both switches on the same side, I need a circuit to make the A2 TTL line to behave in reverse. If High-Level Input Voltage (Vh>2.0 V) the circuit will put out <.8V or...
  2. krytar

    Basic Tripler Circuit

    It works! My tripler works! I used Wenzel method using a Metellic bridge quad diodes to convert sinewave to squarewave. Inject 300MHz signal to input port, I've got 900MHz signal output @20dB loss with 56dB fundamental suppression, second harmonic is way down at noise floor. The conversion...
  3. krytar

    Metal Alloy For Construction of Duplexer, Diplexer or Cavities

    I'm glad that you use my method. Using silver plated aluminum to filter resonators, trnasmission line was downplayed by Bob Wenzel, a filter guru, but we had proven it worked well. Some of our filters/ multiplexers (penta, quadra, tri, and diplexers) are functioning up there in at least 8...
  4. krytar

    Basic Tripler Circuit

    Thanks, Biff44 I checked on Wenzel's papers, and found one of his article on RF magazine is very interesting. From a mixer doubler topology, where a bridge quad is used, he rotates the quad to move the common cathode (from the output) to the next arm connection. Voila! he transforms an...
  5. krytar

    Basic Tripler Circuit

    I've designed frequency doubler (.005-3GHz & 1-11GHZ) using bridge quad diode using core and wire for the lower freq & microstrip for the higher frequency band. I need help on designing low frequency tripler with input from 50-150MHz & 240 -375MHz, +10dBm power input & +15Vdc. I'd like to know...
  6. krytar

    dc-35 MHz 50Ohm-4000 Ohm Transformer

    Hi I would be more than happy to take 4-35MHz transformer. Thanks, Krytar
  7. krytar

    dc-35 MHz 50Ohm-4000 Ohm Transformer

    No, I don't have DC power out or in. The I-Q mixer is a combination of a power divider & a quadrature 90 degree hybrid & two mixers (all are lumped elements) Thanks, krytar
  8. krytar

    Metal Alloy For Construction of Duplexer, Diplexer or Cavities

    Hi, Use silver plated aLuminnum for both housing & resonators. The cheapest way to manufacture the diplexer is to cast both housing & resonators in one piece. Follow this spec to silver plate your aluminum housing: Electroless Nickel per AMS 2405B (200-250 micro-inch), then Copper per...
  9. krytar

    Unexpected/unwanted output on 1GHz mixer

    Hi, Lower your RF power will help to lower the spur level. Put a 10dB pad between RF source & your mixer. Usually, the mixer need very little power from RF to activate the mixing process. LO is the main drive to turn the mixer on. Some mixers can turn on with RF at -20dBm, but most of the...
  10. krytar

    balanced/unbalanced

    Hi, Check out this link: http://www.odyseus.nildram.co.uk/RFMicrowave_Circuits_Files/Balun%20Design.pdf Krytar
  11. krytar

    120 mhz bandpass filter

    Hi, Hipass-Lowpass approach is used when you have a very broadband or steep rejection on both skirts of the filter. For the spec that is given, your approach is correct. If you use a bandpass design, then the ratio between L&C in series will be very hard to realize (e.g. 1pf/1000nH). Use...
  12. krytar

    dc-35 MHz 50Ohm-4000 Ohm Transformer

    Hi, I need help to design a tranformer to match my 50 Ohm output from a I-Q mixer to a load impedance of 4,000 Ohm. The conversion loss from my mixer is about 10.0 dB max (50 Ohm). Rf power is 0 dBm. LO is about +10 dBm. From my calculation the voltage output at I & Q output is about 70 mV...
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