[time-nuts] gps timing antennas

Is there really anything in particular which is different about the antenna requirements of timing receivers as compared to ordinary high-quality receivers? The timing antennas seem to be in pointy radomes, so that tells me they are probably quad-helixes rather than patch antennas. How is that

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

Thanks to all of you so far that made comments on the GPSDO plots; I'll handle this one first. Tom Both the Thunderbolt and Miller designs appear to measure at least 10x better than the most optimistic expectations. Bruce, Interesting thought. What calculations did you use to set your

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

On Feb 13, 2008 1:03 AM, Tom Van Baak [EMAIL PROTECTED] wrote: To prevent, or at least detect, this effect I allow my 10 MHz house reference to drift off-frequency by quite a bit (last month it was 1.7e-12 off). That way there are no on-time or on-frequency sources near the test setup. Tom,

Re: [time-nuts] gps timing antennas

Matt Ettus wrote: Is there really anything in particular which is different about the antenna requirements of timing receivers as compared to ordinary high-quality receivers? The timing antennas seem to be in pointy radomes, so that tells me they are probably quad-helixes rather than patch

Re: [time-nuts] gps timing antennas

In message [EMAIL PROTECTED], Matt Ettus writes: Is there really anything in particular which is different about the antenna requirements of timing receivers as compared to ordinary high-quality receivers? The timing antennas seem to be in pointy radomes, so that tells me they are probably

Re: [time-nuts] gps timing antennas

Poul-Henning Kamp wrote: In message [EMAIL PROTECTED], Matt Ettus writes: Is there really anything in particular which is different about the antenna requirements of timing receivers as compared to ordinary high-quality receivers? The timing antennas seem to be in pointy radomes, so

Re: [time-nuts] gps timing antennas

Matt, The dome type antennae usually found in timing receivers do have a couple of additional features over flat patch types. 1) Physical design for better performance in rain and snow (especially the latter). 2) Additional filtering for improved performance in high noise environments. On

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

Tom Van Baak wrote: Thanks to all of you so far that made comments on the GPSDO plots; I'll handle this one first. Tom Both the Thunderbolt and Miller designs appear to measure at least 10x better than the most optimistic expectations. Bruce, Interesting thought. What calculations

Re: [time-nuts] gps timing antennas

Poul-Henning Kamp wrote: I would suspect that the higher domes is a concession to weather: when mounted on a building or tower, a steeper angle of the surface will collect less snow and dirt. And offers a less comfortable rest place for birds and pigeons... my Z3801A from time to time

Re: [time-nuts] Trimble Thunderbolt Rs-232 Levels

Darrell, I just bought that exact unit a couple weeks ago, probably from the same seller. It works directly with an RS-232 port. I'm using mine with a RS-232/USB adapter to my laptop. The power supply board only supplies the +/- 12VDC and + 5VDC. Here are the Mouser part numbers for the power

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

Hi Tom, I've done that inadvertently, using an M12+ with a totally (by several miles) wrong hold position. The results are astounding, the 1PPS goes completely nuts. Variations of 1000's of ns from 1PPS to the next. I would have expected the M12+ firmware to be much smarter than that.

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

[EMAIL PROTECTED] wrote: Hello Tom, Bruce mentioned there is a validity bit that can be checked for holdover. I wonder if a small micro can be used to hold the EFC voltage steady without much effort. Or maybe using Super-Caps in the loop filter? Or maybe use one of those new 24 bit

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

I was wondering with so many 10 mhz sources running.or even a single cesium and gps receiver running, as I have now..and the 10 mhz is also routed to a clock driver system (leitch).I cannot receive 10mhz wwv broadcasts at all anytime,I am using a old radio shack sw radio on batt power..I tried

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

David Welch wrote: I was wondering with so many 10 mhz sources running.or even a single cesium and gps receiver running, as I have now..and the 10 mhz is also routed to a clock driver system (leitch).I cannot receive 10mhz wwv broadcasts at all anytime,I am using a old radio shack sw radio on

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

I actually think that is where the prob is,I have tried much better sheilding on all the long runs with no change in leakage,I do not have an rfi filter on the power mains though,I also noticed when I use my plasma computer display, it is an old hitachi 25' I lose lock signal on my tru-time wwvb

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

From: [EMAIL PROTECTED] Subject: Re: [time-nuts] GPS Locked and Unlocked Performance Comparison Date: Wed, 13 Feb 2008 14:03:04 EST Message-ID: [EMAIL PROTECTED] Said, I wonder how the Miller unit would perform if the GPS is kept alive during holdover. If the Jupiter continues to

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

Hi Magnus, yes filtering is easier at 10KHz than 1Hz; I wonder how much of the 10KHz modulation signal is getting through into the phase noise at the 10MHz output. bye, Said In a message dated 2/13/2008 15:50:51 Pacific Standard Time, [EMAIL PROTECTED] writes: Indeed. While the time

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

Hi Bruce, there is an excellent paper in this months Evaluation Engineering on how to get 3000dB EMI suppression out of an enclosure, and how small cracks, holes, and crevices can degrade that performance to only 20dB or so:

[time-nuts] David Welch's 3 block signal

Hi David, I am not sure where you are at, but your mail server appears to be on the East Coast of the US. I seriously doubt that it is your in house 10 MHz that is traveling 3 blocks. If it is then there are some serious issues to contend with. The first being, if you are in the US, that you

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

Magnus Danielson wrote: From: [EMAIL PROTECTED] Subject: Re: [time-nuts] GPS Locked and Unlocked Performance Comparison Date: Wed, 13 Feb 2008 19:43:58 EST Message-ID: [EMAIL PROTECTED] Hi Magnus, yes filtering is easier at 10KHz than 1Hz; I wonder how much of the 10KHz modulation

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

From: [EMAIL PROTECTED] Subject: Re: [time-nuts] GPS Locked and Unlocked Performance Comparison Date: Wed, 13 Feb 2008 19:43:58 EST Message-ID: [EMAIL PROTECTED] Hi Magnus, yes filtering is easier at 10KHz than 1Hz; I wonder how much of the 10KHz modulation signal is getting through into

Re: [time-nuts] David Welch's 3 block signal

Yes ,I am looking into a better receiver to test or a spectrum analyzer to find the source of the noise..I can receive wwv on 5 and 15 with no problem at the right times but have a lot of noise(just at 10 mhz.) the radio shack radio is a pll digital model and shows highest signal level at exactly

Re: [time-nuts] gps timing antennas

Hi Brian, Have you ever published your efforts with making the choke ring out of pie plates ? If so do you have that available with, hopefully, pictures, deminsions and so forth ? I have one of the Timing 2000 antennas. Did you use the choke ring pie plate with it ? thanks,

Re: [time-nuts] gps timing antennas

The Motorola Timing 2000 and 3000 antennas are patch antennas. They have a pointed radome. The have very little ground plane, which reduces reception near the ground, which is desirable because of multipath effects.They also have quite a bit of filtering, so transmitting antennas near

[time-nuts] Z3801A schematics?

Are any schematics available, especially for the power supply board? -Dave ___ 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] gps timing antennas

I put pictures out on the net years ago. I put two rulers in the pictures to show folks the dimensions. Back then we used the stock Motorola Antenna97, a patch antenna. I have a set of the antennas stored. When I get to the storage location this weekend, I will try to remember to shoot