Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

Thanks for the tip!  I found a few at around a buck apiece.  Now to do due diligence to see if they will fit my parts. Bob On Monday, August 8, 2016 9:06 PM, Richard W. Solomon wrote: There are a few adapters over on that "auction" site. Do a search on 14 pin smd to 14 pin dip. 73, D

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

Richard mentioned the SMD to leaded adapters which work well. Another way which is more suitable for Manhattan or dead bug type construction is to glue or solder down just tiny printed circuit board which has the SMD footprint and then solder directly to the leads or extensions to the pads. This

[time-nuts] Venus838LPx-T preliminary testing

I measured the message end-time offset on the Navspark version (USB, virtual 115,200 baud) at 153.8 msecs, standard deviation of 7.1 msecs... I don't know how the real serial port version would compare. The Adafruit was 460 msecs, 50 msec standard deviation. - > I've been

Re: [time-nuts] Looking to find an antenna for a TrueTime XL-DC

ziggy9+time-n...@pumpkinbrook.com said: > It IS possible to hack a ’standard’ SV6 receiver such that it will work in > the XL-DC... Did your XL-DC have an actual SV6 in it? I didn't see one in the picture Rick sent out a few days ago. There was a Trible sticker on a chip so I suppose the

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

I doubt it's worth mentioning that a random SMD footprint cut from a larger board and some of the currently available eBay SMD adapter boards may have plated through holes which could short if used to prototype on copper clad board so it's worth paying a little attention to insulating the 'undersid

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

On 8 Aug 2016 21:23, "Bob Camp" wrote: > > Hi > > An even more significant question: > > Is it worth doing? > Your antenna and module could easily have delays > in the 40 ns range. It has no impact on a “frequency” GPSDO. It is one of a number of static offsets in a time transfer system. > > Even

Re: [time-nuts] Speaking clock

Yes the monotonous voice is one reason why it shuts up after 2 minutes. There are better voice synthesizers available these days but I wanted to resurrect the old Votrax chip. Actually I suspect any voice wold get pretty irritating after many repetitions. My Toyota now has a choice of 3 GPS voic

Re: [time-nuts] Looking to find an antenna for a TrueTime XL-DC

My first ever GPS receiver was a surplus SV6. Wow, that's a primitive receiver. The PPS would shift by 6 milliseconds (not microseconds, but milliseconds) every time I didn't have enough satellites in view. Tim N3QE On Tue, Aug 9, 2016 at 4:34 AM, Hal Murray wrote: > > ziggy9+time-n...@pumpkinb

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

If you have *the* active antenna, it is pretty easy to make a little quadrapole circularly polarized antenna out of a couple of pieces of 141 semi-riged coax, and to transmit signal into the active GPS antenna, and measure the signal coming out of the active GPS antenna. If you don't have the actu

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

From: Dr. David Kirkby (Kirkby Microwave Ltd) I thought i might be possible to do this with a VNA, and a test antenna located a known distance apart. So I asked in the Keysight forum on 8th Feb 2015 [] Dave ___ Folks, Yes, I've used the DG8SAQ Vector

Re: [time-nuts] Venus838LPx-T preliminary testing

If you're talking about the NS-T, the picture on their store suggests it may not be the exact same module. Their picture shows a Venus822A. That doesn't necessarily imply that it doesn't have the same behavior, of course. Sent from my iPhone > On Aug 8, 2016, at 9:53 PM, Mark Sims wrote: >

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

Yes, a board with the required footprint would be the way to go.  Where does one find that? On Tuesday, August 9, 2016 12:00 AM, David wrote: Richard mentioned the SMD to leaded adapters which work well. Another way which is more suitable for Manhattan or dead bug type construction is

[time-nuts] Venus838LPx-T preliminary testing

Just checked mine... it's an 822A. They sell it as an '838... bastards... I just ordered one of yours. My RS-232 GPS breakout board already has a connector with Adafruit pinouts on it, so makes life easy. --- > If you're talking about the NS-T, the picture on their store s

Re: [time-nuts] Heathkit clock available

Hi Nick: The GC-1000 was the clock that not only received and was set by WWV (or WWVH) but also had a disciplined oscillator(HFDO) at 3.6 MHz. http://www.prc68.com/I/HeathkitGC1000.shtml Tom: Have you made stability plots for the GC-1000 HFDO? I recently got a Saunders Assoc. 150B Crystal Imp

Re: [time-nuts] Venus838LPx-T preliminary testing

And with that, the first run is out of stock. But don’t worry, I’ve placed an order for more modules and boards. Should be back in stock within a couple weeks, and the stock will run quite a bit deeper than the first batch did. > On Aug 9, 2016, at 10:15 AM, Mark Sims wrote: > > Just checked m

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

On Tue, Aug 9, 2016 at 9:10 AM, Bob Albert via time-nuts wrote: > > Yes, a board with the required footprint would be the way to go. Where does > one find that? You can have small PCBs made for $3 each. There are places here in the US that will do PCBs for $3/square inch with a one square inch

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

Hi: Another option is so Google for a "Breakout board" for the IC you're looking to work with. People like Spark Fun, Seed studio, &Etc make these. It's a board that holds the chip and the needed accessory parts, but needs something else like an Arduino. -- Have Fun, Brooke Clarke http://ww

[time-nuts] Manual for Trimble Placer Gold APU

Does anyone happen to have a user/operations manual for the Trimble Placer Gold APU unit? This was used in emergency service vehicles to give reliable position information, and has inputs from the odometer and reverse gear select to facilitate position estimation when temporarily out of sight of G

[time-nuts] Working with SMT parts.

Hi: I've had good luck using any of the the ExpressPCB services that include solder mask with surface mount parts where the pitch is 0.05" (half normal DIP) and hand soldering (requires stereo microscope). http://www.prc68.com/I/BTSG.shtml (battery top signal generator) http://www.prc68.com/I/I

Re: [time-nuts] Looking to find an antenna for a TrueTime XL-DC

It's an SV6 (SVeeSix), marked TNL 22880-B on the board. On the other hand, I guess you could also say it wasn't an ACTUAL SV6 because of the customization done for Datum/TrueTime. Pictures are in the EEVBlog thread at

[time-nuts] Larus STS54500

I got a CXR LARUS STS54500 SYNCHRONIZING TIMING SYSTEM at auction with the following cards: 1. 54591GPS CLOCK ST3E/LN HLD 2. 54571O/P T1 3. 54550IMU 4. 54580OUTPUT NTS 5. 54560ALARM The GPS CLOCK board has a Tu60-D120-041 receiver card and a TEMEX 0444/0020 DOC2099 oscilla