LeoBodnar GPS Settings
The Leo Bodnar dual-output GPS Reference http://www.leobodnar.com/shop/index.php?main_page=product_info&products_id=234 is very useful, but the settings for dual output can be difficult to calculate. W J Riley has provided an informal evaluation of the device here [[1]] that explains its operation. OZ7OU has provided further information here [[2]].
Dave G4IDR has written a useful spreadsheet for parameter calculations which can be downloaded in this .zip file: File:How the dividers and multipiers work G4IDR.zip.
G4IDR updated to correct values for 10MHz and 116MHz 7th Sept 2018
A programme by G4JNT allows you to specify the two output frequencies and the one generated by the GPS source, then it checks if these are possible and gives some solutions. Not all possibilities can be delivered, but just a range of suitable divider settings. The software can be found here, File:Si5328_Calcs.zip Source code in PowerBasic CC is supplied for information.
The following useful settings have been found to work:
| Output 1 | Output 2 | GPS Reference | N31 | N2_HS | N2_LS | N1_HS | NC1_LS | NC2_LS | BW | By |
|---|---|---|---|---|---|---|---|---|---|---|
| 10,000,000 | 25,000,000 | 100000 | 1 | 11 | 5000 | 11 | 50 | 20 | 7 | G8GKQ |
| 10,000,000 | 125,000,000 | 100000 | 1 | 11 | 5000 | 11 | 50 | 4 | 7 | W J Riley |
| 100,000,000 | 10,000,000 | 4687500 | 6 | 11 | 512 | 11 | 4 | 40 | 15 | G4DBN |
| 116,000,000 | 10,000,000 | 4640000 | 8 | 10 | 800 | 4 | 10 | 116 | 15 | G4DBN |
| 116,000,000 | 10,000,000 | 5000000 | 5 | 10 | 580 | 5 | 10 | 116 | 15 | G4IDR |
