Difference between revisions of "Instruments required"
(Using excalibur as a test Osc.) |
(Thanks to John) |
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To design you own splitter/combiner see this web site for a calculator[http://www.mantaro.com/resources/impedance_calculator.htm#one_to_n_resistive_splitter] | To design you own splitter/combiner see this web site for a calculator[http://www.mantaro.com/resources/impedance_calculator.htm#one_to_n_resistive_splitter] | ||
| − | Several hams are considering using the new Excalibur board as a test oscillator for SSB Phase Noise measurement. 10 MHz is not the best frequency to use, but the TCXO frequency can be changed to 16 MHz by purchasing a new one. John, N8UR, has done a detailed Allan Variance and phase noise measurement of the TCXO on Excalibur. View his measurement results on | + | Several hams are considering using the new Excalibur board as a test oscillator for SSB Phase Noise measurement. 10 MHz is not the best frequency to use, but the TCXO frequency can be changed to 16 MHz by purchasing a new one. John, N8UR, has done a detailed Allan Variance and phase noise measurement of the TCXO on Excalibur. View his measurement results on this website at:[http://www.febo.com/pages/excalibur this site]. Thanks to John for his testing, and taking time to post the results. |
Revision as of 18:22, 2 November 2009
- Two (3) Signal generators
- Hybird combiner
- Audio AC voltmeter
- Distortion meter (FM Only)
- Noise figure meter (for noise figure measurements only)
- Two (2) step attenuators with 10dB and 1dB steps
The signal generators at the W9KFB lab are as follows:
- HP 3586B Selective Level Meter (dBm measurements are calibrated for 75 Ohm characteristic impedance, signal is 0 dBm out only at the level measurement frequency)
- HP 8656B Signal Generator 0.1-990 MHz (dBm measurements are calibrated for 50 Ohm characteristic impedance)
- HP 10544A Crystal Oscillator
The Hybird combiner was made from an old PC network splitter. The device was found in an used PC warehouse. It was a four port device with 4 BNC jacks on it. On inspection of the device, we found that it was a resistive splitter with four 39 Ohm resistors connected to each BNC center contact and a common point. These were removed and replaced with 15 Ohm 2 Watt 2% resistors metal film resistors (NTE 2W015 Flameproof Resistors).
To design you own splitter/combiner see this web site for a calculator[1]
Several hams are considering using the new Excalibur board as a test oscillator for SSB Phase Noise measurement. 10 MHz is not the best frequency to use, but the TCXO frequency can be changed to 16 MHz by purchasing a new one. John, N8UR, has done a detailed Allan Variance and phase noise measurement of the TCXO on Excalibur. View his measurement results on this website at:this site. Thanks to John for his testing, and taking time to post the results.
