EXCALIBUR - Revision history

WA8YWQ: updated link to documents.php -- was documents.html

2012-03-25T02:18:27Z

updated link to documents.php -- was documents.html

2010-01-25T20:11:00Z

wiki

2010-01-25T17:56:43Z

+cat

2009-11-01T03:17:05Z

‎WHAT HPSDR BUILDERS ARE USING TO DRIVE EXCALIBUR

2009-11-01T03:16:35Z

‎WHAT HPSDR BUILDERS ARE USING TO DRIVE EXCALIBUR

2009-10-26T21:28:12Z

‎WHAT HPSDR BUILDERS ARE USING TO DRIVE EXCALIBUR: close up

2009-10-26T21:26:17Z

‎WHAT HPSDR BUILDERS ARE USING TO DRIVE EXCALIBUR: file reference, numbered list

2009-10-26T19:51:15Z

Edit to add Rubidium LPRO-101 paper, announce TAPR availability.

2009-10-18T01:44:34Z

‎DESCRIPTION

2009-10-18T01:43:10Z

‎RELATED DOCUMENTS AND LINKS

@@ Line 86: / Line 86: @@
 The Manual for Excalibur is posted on the Support >> HPSDR Manuals page on this Wiki.
-* http://openhpsdr.org/documents.html
+* http://openhpsdr.org/documents.php
 The PCB cards and schematics are designed in EAGLE Layout Editor

@@ Line 86: / Line 86: @@
 The Manual for Excalibur is posted on the Support >> HPSDR Manuals page on this Wiki.
+* http://openhpsdr.org/documents.html
 http://openhpsdr.org/documents.html
-−
 The PCB cards and schematics are designed in EAGLE Layout Editor
+* http://www.cadsoftusa.com/
-http://www.cadsoftusa.com/
+* http://www.cadsoft.de/
-−
 http://www.cadsoft.de/
 ==
 Good design notes on conversion of sine-waves to squarewaves and vice versa in frequency standards clock distribution are found at Wenzel's web site:
+* http://www.wenzel.com/documents/waveform.html
-http://www.wenzel.com/documents/waveform.html
+* http://www.wenzel.com/library1.htm
-−
 http://www.wenzel.com/library1.htm
 [[Category:Hardware available]]

← Older revision		Revision as of 17:56, 25 January 2010
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	http://www.wenzel.com/library1.htm		http://www.wenzel.com/library1.htm
		+
		+	[[Category:Hardware available]]

@@ Line 79: / Line 79: @@
 I will post submitted descriptions and documents of what HPSDR owners are using to drive their Excalibur boards with.
-#Hans, DL2MDQ and Juergen, DD6UJS have described how to power and interface a surplus LPRO-101 Rubidium Frequency standard suitable for driving Excalibur/HPSDR. See: [[Media:Rb-Normal_paper_20.10.09.pdf‎ |Rb-Normal_paper_20.10.09.pdf‎ ]]‎
+#Hans, DL2MDQ and Juergen, DD6UJS have described how to power and interface a surplus LPRO-101 Rubidium Frequency standard suitable for driving Excalibur/HPSDR.
 == RELATED DOCUMENTS AND LINKS ==

@@ Line 79: / Line 79: @@
 I will post submitted descriptions and documents of what HPSDR owners are using to drive their Excalibur boards with.
-#Hans, DL2MDQ and Juergen, DD6UJS have described how to power and interface a surplus LPRO-101 Rubidium Frequency standard suitable for driving Excalibur/HPSDR. See: [[Media:Rb-Normal_paper.pdf|Rb-Normal_paper.pdf]]‎, (PDF file, size: 1.11 Mb)
+#Hans, DL2MDQ and Juergen, DD6UJS have described how to power and interface a surplus LPRO-101 Rubidium Frequency standard suitable for driving Excalibur/HPSDR. See: [[Media:Rb-Normal_paper_20.10.09.pdf‎ |Rb-Normal_paper_20.10.09.pdf‎ ]]‎
 == RELATED DOCUMENTS AND LINKS ==

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 [[Image:DCP_3351 (Medium).JPG|thumb|500px|]]
 '''Excalibur''' is a small accessory card for the [[ATLAS|Atlas]] bus that enables the use of an external 10 MHz frequency reference for locking the frequency of an HPSDR radio to the same accuracy of the standard, or GPS disciplined oscillator.
 It also provides an optional TCXO frequency reference for the HPSDR, that is much better than the on board 10 MHz oscillators, although not as good as an external standard or GPS-DO.
-Alpha version cards are being built and tested currently.  The first card constructed is pictured.
+Final version cards are currently offered for sale on the TAPR website.  The first prototype card constructed is pictured.
-This board is much simpler than the main HPSDR cards, so I expect that they would be offered as either bare boards, or as kits as was Atlas.  This card uses the larger 1206 surface mount parts for easier manual assembly.
+This board is much simpler than the main HPSDR cards, so they are offered as either bare boards, or as kits as was Atlas.  This card uses the larger 1206 surface mount parts for easier manual assembly.
 Ideas, comments and suggestions are welcome.
@@ Line 55: / Line 53: @@
 == CURRENT STATUS ==
 October 17, 2009
@@ Line 69: / Line 72: @@
 Alpha version cards are being built and tested currently, by Phil, VK6APH; John, N8UR; Joe, K5SO; and myself, KE9H.
 == RELATED DOCUMENTS AND LINKS ==

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 The 10 MHz oscillators on the Mercury or Penelope cards have a rated stability of +/- 50 or 100 ppM over wide temperature, or +/- 500 Hz to 1 kHz at 10 MHz. Using the Calibrate function built into PowerSDR, you can set them to WWV or other reference, with an accuracy of about 10 to 30 Hz, but I would still expect them to walk around +/- 50 to 100 Hz over normal room temperature variation.
-The (medium performance) TCXO on Excalibur has a rated stability of +/- 1 ppM over wide temperature, or +/- 10 Hz at 10 MHz. I observe that over just normal room temperature variation, it stays within 1 Hz of the calibrated frequency, and will likely age at the rate of 1 Hz every several months.
+The TCXO on Excalibur has a rated stability of +/- 1 ppM over wide temperature, or +/- 10 Hz at 10 MHz. I observe that over just normal room temperature variation, it stays within 1 Hz of the calibrated frequency, and will likely age at the rate of 1 Hz every several months.
 A (high performance) external 10 MHz GPS disciplined oscillator will typically exceed +/- 0.0001 ppM or +/- 0.001 Hz at 10 MHz for as long as the GPS system remains operating.
 The card is the same width as Penelope or Mercury, but is only 4 cm. (1.6 inches) high, and takes one slot position on the Atlas bus.
 Although the board contains no software, it is compatible with the JTAG chain, so that it will pass through JTAG programming from cards on either side of it.