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  1. thomaskuhn

    Why is my RF circuit behaving like this?

    I am currently TX at 24dBm and I have 33dB of attenuators. The receiver is -10dBm to -80dBm. I "think" I tried it earlier with a different setup with 50dB attenuation with the same results.
  2. thomaskuhn

    Why is my RF circuit behaving like this?

    I am not an RF engineer but play one at work. I am working in uhf SatCom. In the lab, In order to test two radios communicating over a satellite, I built a small RF circuit out of cots components. I basically put a mixer between the two radios and inject the delta of the uplink and downlink...
  3. thomaskuhn

    Building a Diplexer form COTS parts

    Thanks for the information VE1BLL. Yes, I work for a major defense contractor, and understand the major hoops to jump through to get OTA. This setup would not have any OTA capabilities. This would be for equipment checkout testing only with direct radio to radio connections through a simple...
  4. thomaskuhn

    Building a Diplexer form COTS parts

    I am working on some UHF SATCOM test equipment. We currently have a Trilithic FD1000 Diplexer that works to split/combine the TX and RX, so that radios that have a single RF port can be hooked to radios that have separate RX and TX ports. Unfortunately this FD1000 is pretty expensive and we...
  5. thomaskuhn

    Where can I find a low cost, small form factor, single frequency RF signal generator

    I am not an RF engineer, but I am working with UHF satcom and would like to build a small portable Satellite simulator. The simulator needs a 41MHz 1dBm Rf input to up/down convert the uplink to the downlink. In the lab I use a large bench top HP signal generator to provide this signal. I...
  6. thomaskuhn

    Convert Small signal pulse to RS-232 signal levels?

    That a very good point. I guess i was thinking that the level would be too low to be seen on the digital side. Not sure why i thought that. I guess some of the captures were less siquare waves and more "messy waves". The digital ports might work out fine. I will have try it out
  7. thomaskuhn

    Convert Small signal pulse to RS-232 signal levels?

    Well, I have done some playing and i have struck out a bit I think. I was having all sorts of issues just trying to recapture the pulse again on an o-scope. There seems to be some reliability issue in generating it. The analog input to the Arduino board has a read resolution of 100...
  8. thomaskuhn

    Convert Small signal pulse to RS-232 signal levels?

    Thanks for the great ideas. I ran by radio shack to see if they had any max232 type IC's. no luck BUT i saw the arduino micro, and could not resist. I have been looking for an excuse to get one, and... One thing led to another... And i had to explain to the wife where $35 went and what this...
  9. thomaskuhn

    Convert Small signal pulse to RS-232 signal levels?

    I have a USB monitoring device, that once a certain data pattern is found, triggers out a small 4-5V pulse. The pulse is very small, about 400ns. It seems to be too small to be detected on a RS-232 Clear-To-Send (CTS)input pin. I am using a USB RS-232 dongle (Keyspan USA-19HS) as an input to...
  10. thomaskuhn

    Engineering a sealed speaker into IP67 Encosure

    Thanks, I will look into this also.
  11. thomaskuhn

    Engineering a sealed speaker into IP67 Encosure

    Thanks for the input. As for loudness, anywhere from 85db+.
  12. thomaskuhn

    Engineering a sealed speaker into IP67 Encosure

    I am currently working to improve a product of ours that is a rugged, embedded, man wearable computer enclosure. Our customer would like to implement an audible alarm or better yet, a speaker to play prerecorded audible warnings. The current design is a simple 3" x 6" two piece machined...

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