Gerhard, Don't know if it would help much in your ultimate plan but the concept has been done before as the 53132-60011 and 53132-60016 Optional Time Base Boards for the 53132A counters. These boards will accommodate either an Isotemp OCXO33-46 (HP 1813-0931) OCXO for OPT 001, or either of two variants of the 10811 for OPT 010 or 012. There is a jumper that needs to removed and possibly connected to a power supply for the 10811's.
Might be helpful to take a look at for ideas. Hope this helps. Joe -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of Gerhard Hoffmann Sent: Thursday, October 22, 2015 2:41 AM To: Discussion of precise time and frequency measurement Subject: [Bulk] [time-nuts] Unified VCXO Carrier Board I'd like to design a unified VCXO Carrier Board to these requirements: 1. It can host one of the the following VCXOs: 1.1. HP 10811A-6111 (as from 5370A) 1.2 Morion MV89A 1.3 MTI 260 1.4 CV-950 1.5 Timetech 1.6 Axtal 1.7 Pascall 2. It provides unified tuning: 0V = lowest possible frequency, 3V3 or 5V = highest possible frequency, no matter of the VCXO tuning sense and range. 3. provides a 5V tuning voltage reference for those VCXOs that don't have one of their own. 4. Frequency can be adjusted from external Vtune input and from a 10 turn pot. 5.Board has 2 reference frequency inputs with LTC6957 receivers. One of them can interface the onboard VCXO to the CPLD. 6. Board has a 1pps input 3V3 CMOS level 7. It can lock the VCXO to the reference frequency or the 1pps in. Provides LED lock indication. 8. It features a Xilinx Coolrunner2 2C64 CPLD, complexity 64 FlipFlops + combin. Logic. Unused Pins are brought out to Testpoints in 100 mil grid. The Coolrunner remembers its configuration and can be reprogrammed using the standard Xilinx USB dongle. It has a 10 pin 2mm header for this purpose. Small circuits can run at 200 MHz. This function exists already: < https://picasaweb.google.com/lh/photo/4Bpcfouj8WH0shNGIyuVUtMTjNZETYmyPJy0liipFm0?feat=directlink > 9. The Coolrunner provides a standard 1pps /20us out, maybe 10/100/1000 pps. 10. 2 Monoflops for 1pps LEDs in/out 11. There are 2 output buffers that drive valid 3V3 CMOS into 50 Ohms. They can be re-clocked to LTC6957 outputs with 1G74 flipflops. 12. Unbuffered VCXO output is available on SMA connector 13. One additional buffered output (LMH6702/AD8009 or discrete to avoid neg. supply). This is not meant to be a distribution amplifier. 14. Regulators for the voltages needed. 15. Requires soldering skills 0603 / sot23-5 / MSOP. No commercial interest. Could be TAPR or DIY. I'm open to suggestions & ideas. regards, Gerhard, DK4XP _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
