Re: [time-nuts] Leagage, Tiny SA

IMSAI Guy on Utube does a lot of good videos on RF and he walked through the SA in a few videos and talked about spurs as well. https://youtu.be/uwXUZSdxNq4 the same issues you are having might be discussed at 17:00 -=Bryan=- From: time-nuts on behalf of Gor

Re: [time-nuts] Leakage, tinySA

I use RG400 for most of my time nuts activities. When I switched from cheap RG58 style coax to RG400 a number of strange issues seemed to go away for me. Your mileage may vary (: Mark Spencer m...@alignedsolutions.com 604 762 4099 > On Jan 16, 2021, at 9:40 AM, Brian Lloyd wrote: > >>

Re: [time-nuts] Leakage, tinySA

You can get custom-made decent quality cables with double shielded coax (either RG-316D or RG-142) from China (where else?) for pretty low prices. I am sure the cable isn't mil-spec but I cut a piece open and the shield coverage, which is the main thing I worry about at HF frequencies, is pret

Re: [time-nuts] GPSDO won't lock: OCXO aged out?

Hi Ok, what do you know / have a pretty good guess at? 1) There’s an SC (or similar) cut crystal in there 2) That crystal has a curve that looks something like the “0” or “1” curve in figure 7 of: https://coloradocrystal.com/applications/ 3) It p

Re: [time-nuts] Leakage, tinySA

On 1/16/21 04:32, Hal Murray wrote: The 10 MHz is stronger near coax carrying 10 MHz and next to a Z3801A. I'll have to try some good cables. Anybody have a favorite source? Is there a magic word? Do I have to specify the type of coax? Yes. RG400 or RG316. Do NOT use RG58 or RG174. Both RG

[time-nuts] Leagage, Tiny SA

Greetings, I have one of those tiny SA also. I appear to have a spur at 10 Mhz. Bummer. If anyone comes up with a spur elimination solution please let me know. I found this on the WIKI page; a sort of manual here: https://www.hamcom.dk/TinySA/Description_of_TinySA_a_real_Spectrum_Analyzer_

Re: [time-nuts] GPSDO won't lock: OCXO aged out?

On 1/15/2021 8:30 PM, paul swed wrote: Not sure how hard it might be to get a thermocouple into the oven. That would give you a hint. Regards Paul Seems to me you already have a temperature sensor in the OCXO. If you temperature soak it overnight and monitor the frequency as power is applied,

Re: [time-nuts] Leakage, tinySA

Sorry for the poor grammar on my post below. Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Mike Feher Sent: Saturday, January 16, 2021 11:10 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [ti

Re: [time-nuts] GPSDO won't lock: OCXO aged out?

Hi There is both short term and long term noise on the GPS PPS signal out of a GPS module. Some of the short term noise can be reduced by software using the “sawtooth correction” out. That assumes the module you are using provides this output. The uBlox M8T is one of many that provide this infor

Re: [time-nuts] Leakage, tinySA

There is no birdies on mine that I can see, even as I decrease the RBW. - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -Original Message- From: time-nuts On Behalf Of Dana Whitlow Sent: Saturday, January 16, 2021 6:45 AM To: Discussion of precise time and freque

Re: [time-nuts] GPSDO won't lock: OCXO aged out?

Hi Simple answer is to do a general search on eBay for “OCXO” then take a look at the pictures. The descriptions often are a bit off …. Bob > On Jan 15, 2021, at 11:46 PM, Scott Newell wrote: > > At 07:49 PM 1/15/2021, Bob kb8tq wrote: >> then indeed, the temperature sensitivity will go way

Re: [time-nuts] Leakage, tinySA

Hi > On Jan 16, 2021, at 5:32 AM, Hal Murray wrote: > > > My tinySA arrived a few days ago. I'm happy. > > It comes in a nice box with an antenna that extends to a foot, a USB charging > cable (mini, not micro) and a couple of cables. > > It doesn't come with a manual. I haven't found a m

Re: [time-nuts] GPSDO won't lock: OCXO aged out?

If the gpsdo output pps signal does not drift, but the gps pps signal drifts slowly, it is bound that after a period of time, the gpsdo pps signal will have a very large beat in order to follow the gps. How to solve this problem? In tens of nanosconds, I see that the pps of the gps are always d

Re: [time-nuts] Leakage, tinySA

Another data point: My newly-received TinySA has a big birdie at 10 MHz, which is a disappointment since I had hoped to use the unit as a sniffer to track down leaks in my 10 MHz distribution system. This birdie in the TinySA persists even when nothing is connected to the input and does not vary

Re: [time-nuts] Long Wave Radio-Frequency standard testing

HP journal On Saturday, January 16, 2021, 12:29:24 PM GMT+1, Gilles Clement wrote: Hi Paul, > I guess I would ask what the goal of the effort might be. > It seems like a good answer. One thing I was amazed buy was that back in > the 1960s HP wrote some papers on using WWVB. What they d

[time-nuts] Leakage, tinySA

My tinySA arrived a few days ago. I'm happy. It comes in a nice box with an antenna that extends to a foot, a USB charging cable (mini, not micro) and a couple of cables. It doesn't come with a manual. I haven't found a manual online. Their web site is pretty good, but sometimes I like a

Re: [time-nuts] Long Wave Radio-Frequency standard testing

Hi Paul, > I guess I would ask what the goal of the effort might be. > It seems like a good answer. One thing I was amazed buy was that back in > the 1960s HP wrote some papers on using WWVB. What they did was check the > offset at distance everyday about the same time. This offered quite a bit > m

Re: [time-nuts] Long Wave Radio-Frequency standard testing

There is an earlier NIST publication on the problems here - https://nvlpubs.nist.gov/nistpubs/jres/64D/jresv64Dn3p239_A1b.pdf John ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/tim

Re: [time-nuts] Long Wave Radio-Frequency standard testing

It's a custom LF receiver I put together, a direct conversion downconverter to 1kHz. Then bandpass sampling to an I/Q data steam, at 12 bit resolution sent using RS422 o a PC. All frequency conversion and sampling is locked to a master 10MHz clock. The interface also includes time stamping from a