[time-nuts] Lady Heather
What's the command to set the map to show satellite signal level vs position? 73, Mike, N1JEZ A closed mouth gathers no feet ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] frequency reference for portable operation
Hi Jim, There are a few different schools of thought. Here in New England, I use a very simple GPS locked 10 MHz oscillator. It's based on the Jupiter GPS series with 10 kHz out. It drives a Qualcomm 1152 MHz board. This board generates harmonics through 24 GHz. I don't lock any of my rigs up to 24 GHz. From 47 GHz and up (78, 122, 241 GHz) the rigs are locked mostly using Axtal Axiom 75 series OCXO's and GPS via VE1ALQ reflock boards. For my rigs up to 24 GHz, I use the Qualcomm board to generate accurate markers. From there, I can adjust my IF to compensate. The simple GPSDO driving the Qualcomm is accurate to about 2 Hz/GHz, so even at 24 GHz, I'm typically within about 50 Hz - well within my narrow CW filter on the IF. The added benefit of using the GPS is I have it hooked to an ON4IY RoverBox. This gives me grid square, and Sun position based on location/time for aligning my dish (if the sun is out...) Plus the simple GPSDO is locked and running in about 3 minutes or so from a cold start. I find I don't need ultimate accuracy from 24 GHz down. And not messing with the crystals in LO's keeps phase noise down etc... We've started to add Panadpaters to our IF rigs lately using the FUNCube SDR initially and now the cheaper sticks. These let us see 96 kHz or better at once, so finding the signal can be pretty easy. Remember, locking is great if both ends are locked. If not, you're back to tuning around to find the signal (that's where the panadapter is great!) KT1J and I did our first 2 km 122 GHz contact a while back. We were both locked and had rifle scopes calibrated for aiming. It was amazing to point our dishes and start sending and instantly hear the other station with no tuning! 73, Mike, N1JEZ A closed mouth gathers no feet - Original Message - From: Jim Lux jim...@earthlink.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, March 10, 2013 10:23 AM Subject: [time-nuts] frequency reference for portable operation Asking here on behalf of a friend.. With respect to portable amateur microwave operation.. you want good close in phase noise (so you can use narrow band filters) AND good frequency accuracy (so you can find the signal) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Shera Board
I have a Shera control board that I haven't used in quite some time. I rely on my Z-3801A, Thunderbolts etc Time to sell it if there's any interest. I do not want to ship outside the US. It's currently still in the box where it was disciplining a 10544A. The board only is for sale. Not the GPS engine or 10544A etc. Pic here: http://users.burlingtontelecom.net/~n1...@burlingtontelecom.net/images/Sheraboard.jpg Make me an offer! 73, Mike, N1JEZ A closed mouth gathers no feet ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Jupiter GPS questions
Hi TJ, I recently ran into a similar issue with a Jupiter T. No NMEA output. What I found was the unit came up in Motorola Binary @ 9600 and sent only an initial string out. The solution here was to use a PIC. (I was actually working with a PIC done by Tommy Sullivan called 3DFIXLED) Here are the HEX commands to send to the unit to make it do 9600 baud NMEA. 1.) 0x40 0x40 0x57 0x62 0x01 0x34 0x0D 0x0A This is the @@Wb1 command - switch from Motorola Binary to Zodiac Binary 2.) 0xFF 0x81 0x33 0x05 0x03 0x00 0x00 0x07 0xCB 0x71 0x00 0x00 0x00 0x00 0x01 0x00 0xFF 0xFF This switches to NMEA. There are three additional strings that can be sent to assure sentence output. I'm not sure they are needed, but here they are: 1.) 0xFF 0x81 0x4E 0x04 0x03 0x00 0x00 0x67 0xB0 0x12 0x00 0x00 0x01 0x00 0x00 0x00 0xFF 0xFF 2.) 0xFF 0x81 0xEB 0x03 0x03 0x00 0x00 0x67 0x13 0x13 0x00 0x00 0x01 0x00 0x00 0x00 0xFF 0xFF 3.) 0xFF 0x81 0xF4 0x03 0x03 0x00 0x00 0x67 0x0A 0x13 0x00 0x00 0x01 0x00 0x00 0x00 0xFF 0xFF There is no ACK that I see. I'd power up and wait a few seconds, then send the first string, then wait a couple more secs and send at least the second string. After doing this, my unit now sends out GPGGA, GPRMC and GPGSA sentences @ 9600 baud. 73, Mike, N1JEZ A closed mouth gathers no feet -Original Message- From: TJ Fiel zulut...@yahoo.com Subject: Contact: Jupiter GPS questions Message: Hello KO4BB, Many thanks for making so many resources available through your website. I'd never seen Labmon 7 before and it cured several problems with previous versions. I'm attempting to use a Jupiter serial GPS receiver with APRS. This is an OEM version made for Etak/Sony about 1999, p.n. TU40-D310-011. It uses the Rockwell Scorpio DSP (11577-11) but implements few features. I've never found a datasheet or even a pinout for this chip. Conexant stopped producing this chip about ten years ago and now they don't appear to answer their phones. Apparently they never released chip level data to the public for this DSP, only for built-up GPS modules. My biggest issues are automatically forcing NMEA out at startup and possibly adding an RTC. Any insights you can give will be greatly appreciated. Best wishes and thanks, TJ Fiel ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] FEI-Zyfer
Anyone have a manual for an FEI-Zyfer Nanosync II? It's listed on their website, but clicking on the link throws up a 404 error Tnx, Mike A closed mouth gathers no feet ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] FEI-Zyfer
Hi guys, I was able to simply register at the site then had access to another file are that had info on the Nanosync II and their monitor software. Mike - Original Message - From: Mike Seguin N1JEZ n1...@burlingtontelecom.net Subject: [time-nuts] FEI-Zyfer Anyone have a manual for an FEI-Zyfer Nanosync II? It's listed on their website, but clicking on the link throws up a 404 error Tnx, Mike A closed mouth gathers no feet ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
