Instruments required - Revision history

OZ1HFT: spelling

2011-04-24T10:23:14Z

spelling

OZ1HFT: +cat

2010-01-25T18:39:41Z

+cat

W9KFB: Added sentence on 4.800000 MHz Osc.

2009-11-04T04:23:51Z

Added sentence on 4.800000 MHz Osc.

W9KFB: Thanks to John

2009-11-03T02:22:26Z

Thanks to John

W9KFB: Using excalibur as a test Osc.

2009-11-03T02:10:31Z

Using excalibur as a test Osc.

W9KFB: New page

2009-10-27T23:57:52Z

New page

New page

#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
[[Image:W9KFBinstrumentstack.jpg|thumb|300px|Top to bottom, HP 3406A Broadband Sampling voltmeter, Tektronics TAS 465 Two Channel 100MHz Oscilloscope, HP 3586B Selective Level Meter, and HP 8656B Signal Generator]]
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
[[Image:45 Ohm combiner.jpg|thumb|300px|Formulas and Values for a 45 Ohm Hybrid Combiner]]
[[Image:Homebrewcombiner.jpg|thumb|300px|Homebrew 45 Ohm Hybrid Combiner]]
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[http://www.mantaro.com/resources/impedance_calculator.htm#one_to_n_resistive_splitter]

← Older revision		Revision as of 18:39, 25 January 2010
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	We have found inexpensive used cell-tower 4.800000 MHz OCXOs on eBay recently. They require 12 Volt power and output is +15 dBm. We will test them and evaluate their application as a low phase noise test oscillator.		We have found inexpensive used cell-tower 4.800000 MHz OCXOs on eBay recently. They require 12 Volt power and output is +15 dBm. We will test them and evaluate their application as a low phase noise test oscillator.
		+
		+	[[Category:Hardware]]

← Older revision		Revision as of 04:23, 4 November 2009
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	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.		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.
		+
		+	We have found inexpensive used cell-tower 4.800000 MHz OCXOs on eBay recently. They require 12 Volt power and output is +15 dBm. We will test them and evaluate their application as a low phase noise test oscillator.

← Older revision		Revision as of 02:22, 3 November 2009
Line 16:		Line 16:
	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 ~~his~~ website at:[http://www.febo.com/pages/excalibur this site].	+	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.

← Older revision		Revision as of 02:10, 3 November 2009
Line 15:		Line 15:

	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 his website at:[http://www.febo.com/pages/excalibur this site].

@@ Line 1: / Line 1: @@
-#Two (3) Signal generators
+# Two (3) Signal generators
-#Hybird combiner
+# Hybrid combiner
-#Audio AC voltmeter
+# Audio AC voltmeter
-#Distortion meter (FM Only)
+# Distortion meter (FM Only)
-#Noise figure meter (for noise figure measurements only)
+# Noise figure meter (for noise figure measurements only)
-#Two (2) step attenuators with 10dB and 1dB steps
+# Two (2) step attenuators with 10dB and 1dB steps
 [[Image:W9KFBinstrumentstack.jpg|thumb|300px|Top to bottom, HP 3406A Broadband Sampling voltmeter, Tektronics TAS 465 Two Channel 100MHz Oscilloscope, HP 3586B Selective Level Meter, and HP 8656B Signal Generator]]
 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 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 8656B Signal Generator 0.1-990 MHz (dBm measurements are calibrated for 50 Ohm characteristic impedance)
-#HP 10544A Crystal Oscillator
+# HP 10544A Crystal Oscillator
 [[Image:45 Ohm combiner.jpg|thumb|300px|Formulas and Values for a 45 Ohm Hybrid Combiner]]
 [[Image:Homebrewcombiner.jpg|thumb|300px|Homebrew 45 Ohm Hybrid Combiner]]
-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).
+The Hybrid 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[http://www.mantaro.com/resources/impedance_calculator.htm#one_to_n_resistive_splitter]