Table of Contents
Summary of Contents for HPSDR Excalibur
- Page 1 High Performance Software Defined Radio Open Source Hardware and Software Project Project Description: http://openhpsdr.org Excalibur Assembly and Operation Instructions Author: Graham Haddock, KE9H Revision 1.0 Copyright KE9H, 2009...
-
Page 2: Table Of Contents
Contents Introduction …………………………………………...….. Description ……………………………………………….. HPSDR SetUp ……………………………………………. PowerSDR Settings ………………………………….…. Excalibur Adjustment …………………………….……. Excalibur Configuration ……………………….……. Assembly Instructions ………………………………… Appendix "A" Schematic and Board Top View, Silkscreen Errata. Appendix "B" Comments on hand assembly of SMT components. Appendix "C"... -
Page 3: Introduction
Introduction Excalibur is a small accessory card for the 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. -
Page 4: Hpsdr Setup
The TCXO on Excalibur has a rated stability of +/- 1 ppM over wide temperature, or +/- 10 Hz at 10 MHz. Over 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. (See performance measurements, in Appendix “F”.) -
Page 5: Excalibur Configuration
The TCXO also has an aging specification, typical of all crystals, such that it will slowly drift at the rate of one Hertz every several months or so. Excalibur Configuration There are two configurable jumper pin settings. Jumper J1 should be present if you want to terminate the External Reference Input in 50 Ohms. -
Page 6: Assembly Instructions
Assembly Instructions Recommended Hand Assembly Order The general order is small to large, center to outside, surface mount first then thru hole last. Specifically, this is the recommended order: 1.) Small common parts - bypass caps 2.) Other small surface mount capacitors, resistors, diode, transistors. 3.) Surface Mount ICs 4.) Connectors 5.) Toroid... - Page 7 Appendix "A" contains the schematic and Board Top View, showing all part locations. This Board Top View should be used as the master reference for all part locations. Observe the silkscreen errata for Resistors R08 and R11. Appendix "E" contains the instructions for winding the toroid. Checkout prior to first power application.
-
Page 8: Appendix "A
Appendix "A" Schematic, Board Top View and PCB Silkscreen Errata Revision 1.0 Copyright KE9H, 2009... - Page 9 0.1uF TC1-1T 2N3906 VCOIN DEMOUT +3.3V 74HC4046 0.1uF 0.1uF 10 MHz OUT 0.1uF 0.1uF 768nH TERM 74AC04D 470pF 560pF SOURCE SELECT SYNC Excalibur +5V/1 TCXO Version 1.3 11 OCT 2009 0.1uF Copyright KE9H 2009 10 MHz CXOH20 To Atlas C16...
- Page 10 +5V/1 +3.3V LP2985 3.3 Volts ON/~OFF 2.2uF 10uF 0.1uF 0.01uF +12V L78L06_D +6 Volts Vout 10uF 0.1uF 0.1uF L78L05_D +5 Volts Excalibur Vout Version 1.3 0.1uF 0.1uF 11 OCT 2009 Copyright KE9H 2009...
- Page 13 PCB Silkscreen Errata There was a last minute change that didn’t update the silkscreen properly. See below for the proper location of R11 and R08. The board layout on the previous page is correct. Revision 1.0 Copyright KE9H, 2009...
-
Page 14: Appendix "B
Appendix "B" Comments on Surface Mount assembly This appendix is not intended as a tutorial on surface mount soldering, but to give a few highlights. You can find many tutorials on hand soldering SMT components on-line, particularly on YouTube. This product has about 46 surface mount components, generally using the largest size available, that should make this a good choice for a first kit using surface mount assembly, by hand. - Page 15 down all pins. If you have a solder short between adjacent pins, remove any excess solder with “solder wick.” For final inspection, a "Jewelers eye loupe" of approximately 4x power is a great aid. Loupes manufactured in Asia are available on eBay or similar sources for a few dollars. Revision 1.0 Copyright KE9H, 2009...
-
Page 16: Appendix "C
Appendix "C" Bill of Materials Revision 1.0 Copyright KE9H, 2009... - Page 17 Excalibur Bill of Materials Version 10/11/2009 Footprint/ Part Value Description Package Manu Part No. Vendor Part No. Notes 0.1uF Chip Cap C1206 C1206 Kemet C1206C104K3RACTU Mouser 80-C1206C104K3R 0.1uF Chip Cap C1206 C1206 Kemet C1206C104K3RACTU Mouser 80-C1206C104K3R 0.1uF Chip Cap C1206...
- Page 18 Mouser 863-MC78L05ACDG BNC - RA Connector SD-73100-FLT Molex 73100-0105 Mouser 538-73100-0105 BNC - RA Connector SD-73100 Molex 73100-0105 Mouser 538-73100-0105 10.000 MHz CXOH20 CXOH20 Crystek CXOH20-BP-10.000 Mouser 549-CXOH20-BP-10 Jumper Clips Bergcon 68786-102LF Mouser 649-68786-102LF 2 each required Excalibur- Ver 1.3...
-
Page 19: Appendix "D
Appendix "D" BOM Special Sort - Recommended Assembly Order Revision 1.0 Copyright KE9H, 2009... - Page 20 Excalibur Bill of Materials Version 10/11/2009 SPECIAL SORT FOR RECOMMENDED ASSEMBLY ORDER Footprint/ Part Value Description Package Manu Part No. Vendor Part No. Notes 0.1uF Chip Cap C1206 C1206 Kemet C1206C104K3RACTU Mouser 80-C1206C104K3R 0.1uF Chip Cap C1206 C1206 Kemet C1206C104K3RACTU...
- Page 21 RED-GRN DUAL-LED LED-DUAL Lite-On LTST-C155KGJRKT Mouser 859-LTST-C155KGJRKT Observe Polarity/Position 2N3906 PNP Transistor SOT23 Fairchild MMBT3906 Mouser 512-MMBT3906 2N3906 PNP Transistor SOT23 Fairchild MMBT3906 Mouser 512-MMBT3906 74AC04D 74AC04D SO14 SN74AC04D Mouser 595-SN74AC04D Observe Position Dot 74HC4046A 74HC4046A SO16 CD74HC4046AM96 Mouser 595-CD74HC4046AM96 Observe Position Dot 3.3V LP2985...
-
Page 22: Appendix "E
Appendix "E" Instructions for Winding the Toroid Note : When counting turns of wire on a toroid, the definition of a turn is a pass through the center of the toroid. So, a two turn toroid, would have the wire passing through the center hole two times. - Page 23 STARTING THE WINDING Start the winding with the wire positioned as shown. Proceed winding until there are fifteen turns of wire on the toroid. The completed, the toroid should look as shown at the front of this section. Check that the top and bottom wire exit as shown.
-
Page 24: Appendix "F
Appendix "F" Performance Measurements Revision 1.0 Copyright KE9H, 2009... - Page 25 65F to 79F; I did not record the precise time-temperature profile of the shack during these measurements. As you can see from the plot, the Excalibur TCXO stayed at 10 MHz within about +/- 1 Hz during the entire measurement period.
- Page 26 John Ackermann, N8UR did some very detailed testing of stability and phase noise performance. Refer to his website at http://www.febo.com/pages/excalibur for a lot more detail of his testing methodology, results, and comments on the TCXO performance. Revision 1.0 Copyright KE9H, 2009...
Need help?
Do you have a question about the Excalibur and is the answer not in the manual?
Questions and answers