Re: [time-nuts] GPS Antennas

Hi The standard process after printing ABS is to vapor the part. That forms a solid surface. Bob > On Oct 15, 2019, at 12:16 PM, Attila Kinali wrote: > > On Tue, 15 Oct 2019 11:29:08 -0500 > Bob kb8tq wrote: > >> There are a lot of 3D printers out there that happily print ABS …. > > I am

Re: [time-nuts] HP Z3805A GPS replacement ?

Hi Greg, Brilliant! - I did not know about the adapter boards that looks like an excellent solution. I like the idea of substituting an uBlock for its receiver. Thanks also for the additional info, I had managed to find some of that at least :) After sorting out the 422 to 232 conversion

Re: [time-nuts] GPS Antennas

Hi All, Just to be clear, the request was about which multi-band antenna to buy. I'd like to play with the new F9P or F9T GPS modules. The Chinese unit from ebay is now in hand, and I need a free weekend to build a mount for the house. For those concerned with the lightning aspect, The hits

Re: [time-nuts] Question for my new GPSDO

Hi Attila, I have read all your messages, but for the sake of simplicity, I only reply to your last one. First, thanks for sending the schematics. I have a look at them. To see the components you selected is indeed very helpful. I attached my own schematics of the EFC control circuit. I think

Re: [time-nuts] GPS Antennas

On 10/15/19 8:19 PM, ed breya wrote: Attila wrote: "Bob kb8tq > wrote: /There are a lot of 3D printers out there that happily print ABS …. / I am not sure that's a good idea. The way how filament printers work will lead to

Re: [time-nuts] Question for my new GPSDO

If the DAC update rate isn't excessive a 2nV-sec glitch is unlikely to produce a significant perturbation at the output of the lowpass filter following the DAC. Bruce > On 16 October 2019 at 21:01 Attila Kinali wrote: > > > On Wed, 16 Oct 2019 15:04:31 +1300 (NZDT) > Bruce Griffiths wrote:

Re: [time-nuts] Question for my new GPSDO

On Wed, 16 Oct 2019 15:04:31 +1300 (NZDT) Bruce Griffiths wrote: > Consistency of the glitch independent of DAC output is more important than > its size. A constant amplitude glitch occurring at the dac update rate is > more benign in its effect than a glitch whose amplitude varies with DAC >

Re: [time-nuts] Question for my new GPSDO

On Tue, 15 Oct 2019 18:43:29 -0700 Hal Murray wrote: > You can get a few bits by reducing the tuning range. Suppose you follow the > DAC with an OpAmp with a gain of 1/8 while the reference is adjustable. That > adds 3 bits of resolution by decreasing the output range. The downside is >

[time-nuts] DUT Error Multiplication (was FA-2 Questions)

Yo Bubba Dudes!, I proposed using a HP8586A and a Fluke 6080 for DUT error multiplication of 100. Several responses basically said: the HP8656 sucked so bad it wouldn't work. Ed suggested brick PLL but i couldn't find any I could understand. So a new idea since another signal generator is not in

Re: [time-nuts] GPS Antennas

Attila wrote: "Bob kb8tq > wrote: /There are a lot of 3D printers out there that happily print ABS …. / I am not sure that's a good idea. The way how filament printers work will lead to lots of pores where humidity can

Re: [time-nuts] GPS Antennas

If your other gear survived, likely, the lightening hit was an indirect one.  If you do install more rods near antennas, it is extremely important that those rods are connected/bonded to the house main feed grounds at service entrance via low impedance/resistance connection.  How exactly this