[time-nuts] Re: Ublox NEO-M8T-0-10as a LO question
Hello everyone Monday, March 29, 2021 Thanks for the replies, some went a little over my head, which is not hard :) I am wondering how people successfully use a Leo Bodnar programmable GPS source to provide an external LO for an LNB as opposed to its internal xtal. What is different, in simple terms please, between my Ublox output and the Leo Bodnar one? Best regards, Chrismailto:ch...@chriswilson.tv LJ> On 3/29/21 10:14 AM, John Ackermann N8UR wrote: >> That's probably a really bad idea. The phase noise from the TIMEPULSE >> output is pretty bad compared to a "real" RF source, and by the time >> it's multiplied up to 10 GHz you'll have more noise than signal. >> Attached are some phase noise plots and a couple of spectrum analyzer >> captures to give you some idea what to expect. >> BTW, even the Bodnar unit may not look too good at 10 GHz -- remember >> that you increase phase noise by 20 dB for 10 times multiplication. >> John LJ> What's the signal bandwidth from Es'Hail? LJ> The optimum strategy is a *very quiet* crystal oscillator that you LJ> discipline with the 1pps, and choose that oscillator so its frequency is LJ> what you need. LJ> What we've done in the past is use the reference to clock a NCO in FPGA, LJ> and use one of the well known spur reduction techniques that pushes the LJ> spurs away from the center before running it to the DAC. This degrades LJ> the performance at, say, 100kHz away, but improves the performance LJ> within 1 kHz. This relies on knowing what the loop bandwidth is in your LJ> 10GHz LO PLL, since inside that bandwidth it's the reference, but LJ> outside it's the DRO or GaAs oscillator. LJ> There might be some DDS chips that implement this kind of thing - the LJ> latest chips from ADI are pretty sophisticated. >> On 3/29/21 12:25 PM, Chris Wilson wrote: >>>29/03/2021 17:20 >>> Can I use my Ublox NEO-M8T-0-10 as a LO for a modified satellite >>> LNB on 10 GHz? It needs 25 MHz and the Ublox is my only GPS locked >>> source for such a frequency. I want to receive the Es Hail downlink >>> with excellent stability. I can lock the receiver to 10 MHz which is >>> available from my Trimble Thunderbolt. If the Ublox would do I would >>> not have to buy something like the Leo Bodnar GPS. Thanks. >> ___ >> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an >> email to time-nuts-le...@lists.febo.com >> To unsubscribe, go to and follow the instructions there. LJ> ___ LJ> time-nuts mailing list -- time-nuts@lists.febo.com -- To LJ> unsubscribe send an email to time-nuts-le...@lists.febo.com LJ> To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Ublox NEO-M8T-0-10as a LO question
29/03/2021 17:20 Can I use my Ublox NEO-M8T-0-10 as a LO for a modified satellite LNB on 10 GHz? It needs 25 MHz and the Ublox is my only GPS locked source for such a frequency. I want to receive the Es Hail downlink with excellent stability. I can lock the receiver to 10 MHz which is available from my Trimble Thunderbolt. If the Ublox would do I would not have to buy something like the Leo Bodnar GPS. Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
Re: [time-nuts] Can a Trimble Thunderbolt cause QRM? Noise can be seen remotely via my SDR.
Hello everyone Tuesday, January 12, 2021 Many thanks for the replies, Time Nuts always confuses my mail app and I have to check if replies are from an individual or via the reflector. I am posting here to say the situation is now resolved, thanks. I eventually tracked the culprit down today. Getting on site and turning off all the power, and using a battery powered receiver saw no change. I was mortified. Nonetheless the stability and strength of the interference still had me believing it was very localized. It was then I started thinking of any battery powered source with a 10 or 20MHz reference in it. My race truck has a GPS tracker in it. It's internally battery powered when the ignition is off... I turned it on at the end of the season when the truck went into hibernation. I opened the truck and was reminded the tracker had a USB cable pig tail for connection to a PC for setting up attached and strung behind its hiding place. I removed the USB cable from the GPS unit (a quality make, not some Chinese clone) and went back to the receiver in the house. The noise was gone!!! For kicks I reconnected the USB data cable and the noise was back again. So thanks for the suggestions, all these modern gizmos we surround ourselves with, it's no surprise many suffer huge noise levels! All the best and thanks again! Best regards, Chrismailto:ch...@chriswilson.tv CW> 12/01/2021 23:21 CW> I have had a sudden occurrence of interference on all my HF CW> receivers / transceivers recently. I cannot gain access to the CW> remote location where they are and am operating them remotely at CW> the moment. At the site is my Trimble Thunderbolt and it's been on CW> permanently for several years with no apparent issues. It feeds a CW> divider by David Partridge. I am wondering if the TB could be the CW> source of the QRM in some way as it's bang on 10MHz. I no longer CW> see WWV but a very loud noise on all receivers on 10MHz, 20MHz and CW> 30MHZ. If I zoom right in I see what looks like FSK on the signal. CW> The spurs are all over the place and particularly bad, if they are CW> indeed spurs of the 10MHz noise, around 21 MHz. CW> Would some Sherlock Holmes who is familiar with remote operating CW> a Kiwi SDR receiver have a look around and tell me if they think CW> the TB could have gone berserk in some way please? I can't think CW> of any other 10Mhz source at the location. Thanks and a belated CW> happy and healthy New Year to all. CW> The Kiwi can be accessed at: CW> http://82.70.254.222:8073/ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Can a Trimble Thunderbolt cause QRM? Noise can be seen remotely via my SDR.
Hello to those that replied off group. Tuesday, January 12, 2021 Many thanks for the replies, Time Nuts always confuses my mail app and I have to check if replies are from an individual or via the reflector. I eventually tracked the culprit down today. Getting on site and turning off all the power, and using a battery powered receiver saw no change. I was mortified. Nonetheless the stability and strength of the interference still had me believing it was very localized. It was then I started thinking of any battery powered source with a 10 or 20MHz reference in it. My race truck has a GPS tracker in it. It's internally battery powered when the ignition is off... I turned it on at the end of the season when the truck went into hibernation. I opened the truck and was reminded the tracker had a USB cable pig tail for connection to a PC for setting up attached and strung behind its hiding place. I removed the USB cable from the GPS unit (a quality make, not some Chinese clone) and went back to the receiver in the house. The noise was gone!!! For kicks I reconnected the USB data cable and the noise was back again. So thanks for the suggestions, all these modern gizmos we surround ourselves with, it's no surprise many suffer huge noise levels! All the best and thanks again! Best regards, Chrismailto:ch...@chriswilson.tv CW> 12/01/2021 23:21 CW> I have had a sudden occurrence of interference on all my HF CW> receivers / transceivers recently. I cannot gain access to the CW> remote location where they are and am operating them remotely at CW> the moment. At the site is my Trimble Thunderbolt and it's been on CW> permanently for several years with no apparent issues. It feeds a CW> divider by David Partridge. I am wondering if the TB could be the CW> source of the QRM in some way as it's bang on 10MHz. I no longer CW> see WWV but a very loud noise on all receivers on 10MHz, 20MHz and CW> 30MHZ. If I zoom right in I see what looks like FSK on the signal. CW> The spurs are all over the place and particularly bad, if they are CW> indeed spurs of the 10MHz noise, around 21 MHz. CW> Would some Sherlock Holmes who is familiar with remote operating CW> a Kiwi SDR receiver have a look around and tell me if they think CW> the TB could have gone berserk in some way please? I can't think CW> of any other 10Mhz source at the location. Thanks and a belated CW> happy and healthy New Year to all. CW> The Kiwi can be accessed at: CW> http://82.70.254.222:8073/ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Can a Trimble Thunderbolt cause QRM? Noise can be seen remotely via my SDR.
12/01/2021 23:21 I have had a sudden occurrence of interference on all my HF receivers / transceivers recently. I cannot gain access to the remote location where they are and am operating them remotely at the moment. At the site is my Trimble Thunderbolt and it's been on permanently for several years with no apparent issues. It feeds a divider by David Partridge. I am wondering if the TB could be the source of the QRM in some way as it's bang on 10MHz. I no longer see WWV but a very loud noise on all receivers on 10MHz, 20MHz and 30MHZ. If I zoom right in I see what looks like FSK on the signal. The spurs are all over the place and particularly bad, if they are indeed spurs of the 10MHz noise, around 21 MHz. Would some Sherlock Holmes who is familiar with remote operating a Kiwi SDR receiver have a look around and tell me if they think the TB could have gone berserk in some way please? I can't think of any other 10Mhz source at the location. Thanks and a belated happy and healthy New Year to all. The Kiwi can be accessed at: http://82.70.254.222:8073/ -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] GPS location inaccuracies from a cell phone
Hello everyone, Sorry fore the late reply, work took me away again. Many thanks for the detailed replies, I now understand how cell phone GPS might not be as accurate as the one in a dedicated GPS tracking device, and that certainly is the case in tests I have done. All very interesting and much appreciated, both the replies here and bu direct e-mail, thank you again! Monday, February 3, 2020 Best regards, Chrismailto:ch...@chriswilson.tv j> On 2/2/20 9:35 AM, Chris Wilson wrote: >> >> >>02/02/2020 17:28 >> >> Hopefully not too off topic a question, but GPS experts abound here... >> >> I am running a tracking device server on one of my PC's and an option >> is to use an app on a cell phone and the phone acts as a tracking >> device. But it shows seemingly random anomalies in position. For >> example I walked the dogs around the wood earlier. 99% of the tracking >> of the phone is correct, but I see occasional abnormalities where the >> track veers off into the distance to a "dead end" where I have >> certainly not taken the phone. >> >> Could it be because I am not keeping the phone in a constant >> orientation? I do not see such anomalies with a "proper" tracking >> device, say in a vehicle? Where the trace veers off I may have been >> bending down burning some rubbish. Te phone would have been in the top >> pocket of my overalls. Any idea why these anomalies occur please? The >> track can be seen at http://www.chriswilson.tv/phone.jpg >> >> j> GPS (and time derived from GPS) on a phone is a funny thing. They j> obsess about energy consumption ( how many picojoules/fix kind of j> things). Therefore, they do fixes on a sort of "as needed" basis and j> feed that to the API. A couple things can screw this up: j> The *legal* requirement driving GPS is the E-911 service, but they only j> need good accuracy when you're making a 911 call. j> Most phones make heavy use of Assisted-GPS - the cellsite gives them an j> estimate of position and the approximate code phase and timing, so that j> acquisition can be fast (and consume small power). j> A mapping application (or the phone API, I don't know) could also do j> some sort of "forward estimation" of position (i.e. you were heading 130 j> degrees at 5 m/s so after 10 seconds, your position is X meters north j> and Y meters East. j> Note also that the mapping applications target people *driving* so they j> do interesting things like snapping to likely positions (i.e. you're not j> likely to be in the middle of a river, so they snap to the road) and j> they filter out small velocity variations. If you're walking, the j> application might shift to a different position filter (particularly in j> urban areas, where multipath is a reality, but position is aided by j> things like known WiFi access points, etc.) j> ___ j> time-nuts mailing list -- time-nuts@lists.febo.com j> To unsubscribe, go to j> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com j> and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] GPS location inaccuracies from a cell phone
02/02/2020 17:28 Hopefully not too off topic a question, but GPS experts abound here... I am running a tracking device server on one of my PC's and an option is to use an app on a cell phone and the phone acts as a tracking device. But it shows seemingly random anomalies in position. For example I walked the dogs around the wood earlier. 99% of the tracking of the phone is correct, but I see occasional abnormalities where the track veers off into the distance to a "dead end" where I have certainly not taken the phone. Could it be because I am not keeping the phone in a constant orientation? I do not see such anomalies with a "proper" tracking device, say in a vehicle? Where the trace veers off I may have been bending down burning some rubbish. Te phone would have been in the top pocket of my overalls. Any idea why these anomalies occur please? The track can be seen at http://www.chriswilson.tv/phone.jpg Thanks! -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] NTP apps on Windows question
24/09/2019 19:58 I have used Meinberg NTP and also Thinking Man's Dimension 4 as NTP applications on Windows 7 64 bit OS's on 3 PC's. I use them to sync the PC time for WSJT-X WSPR (a low power digital amateur radio mode) which requires an accurate time on the PC's for successful decoding and transmitting of digital signals. Both Dimension 4 and Meinberg have occasionally not allowed proper syncing with the WSPR application attempting to decode up to 4 seconds late, despite my Trimble Thunderbolt and Lady Heather showing the PC is synced to GPS time within less than a second, by eye. I am now trying another NTP app by DL4YHF Wolfgang Buscher. My questions are, is such an anomaly known and should I disable Windows Internet Time synchronization when using another NTP app? I see no mention of disabling this in any of the NTP application's notes... The WSPR application, WSJT-X has very recently been released in a 64 bit version, which is what I am using, and I have to wonder if the new version has some minor bug as I find it hard to believe two well known and used NTP apps are buggy. Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Si5351A harmonics question
05/06/2019 16:24 I am using a small transmitter called a U3S by QRP Labs as an exciter for a high power Class D amp. I take the output at circa 951kHz direct from CLK0 (it has no output stage built, I go direct from CLK0 on the Si5351A and input it to a level converter based on a SN74AHCT125N IC. The Class D amp needs a frequency input of X2 the desired output frequency. I have experienced terrible gate and drain waveforms on two Class d amps driven by this, so I put my SA on the output of the SN74AHCT125N via a switchable 50 Ohm attenuator. I see the trace in the first photo in the link below. Now I am the first to admit that apart from a fear of blowing the SA front end, I am a total novice with an SA. Are the high level additional frequencies away from the centre frequency to be expected, and do LPF's work on square waves? I di try a big high power 475 kHz LPF between the output of the SN74AHCT125N and the SA and the second shot was the result. Obviously that LPF is far from ideal though, but it was sat on the bench so I trie it Thanks please keep the answers at a novice level :) http://www.chriswilson.tv/mf.zip https://www.qrp-labs.com/ultimate3/u3s.html -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] GN-GGB0710 GPS Antenna Mounting Thread
Hello Discussion, Monday, February 25, 2019 NP and BSP (National Pipe and British Standard Pipe) thread size like 1/4" NP are not really indicative of actual diameter per se, plus you have taper seal threads (NSPT and BSPT) to bear in mind. Threads are a subject in themselves :) https://en.wikipedia.org/wiki/National_pipe_thread https://en.wikipedia.org/wiki/British_Standard_Pipe Best regards, Chrismailto:ch...@chriswilson.tv DW> The bit of threaded tubing I found at the hardware store that fits DW> perfectly is labeled: DW> ProLine plumbing and heating products DW> BN-750NLB DW> 877250 DW> Nipple DW> (Niple) DW> 1/4 inch x 1/4 inch x 6 inch DW> MIP DW> for installation instructions visit: DW> www.bkproducts.com DW> I was surprised by the 1/4 inch bit, as it seems distinctly larger. It is DW> definitely tapered and threads smoothly, and seats firmly with all of the DW> threads engaged. DW> Dave DW> ___ DW> time-nuts mailing list -- time-nuts@lists.febo.com DW> To unsubscribe, go to DW> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com DW> and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Ublox Neo M8T no output on TP2 question please?
Hello Time Nuts, Tuesday, January 22, 2019 The Ublox M8T is now fixed! For future reference this is what was wrong. CSG Shop ship various versions of this GPS module on a generic board, as far as I can tell, and reading between the lines. Some versions need this jumper across two of the three normally bare solder pads. Mine seems to have "escaped" with a Neo_M8T but the jumper soldered in place needed for NEO_M8L and NEO-M8U modules. Upon removing it the device now outputs under control of the current release of U-Centre software on TP0 and TP2. On another list I have been warned to only capacitively couple TP2 to "whatever" in case "whatever" pulls TP2 to low, which would put it in Safe Mode. If anyone wants a photo of how the pads should be for the M8T I can take one and link here. But basically the M8T module should have NO jumpers across the three pads on the reverse side of the board...A learning experience I could have done without, but at least I have learnt something and it can now be cased up :) Thanks to all for help here and by direct e-mail. Best regards, Chrismailto:ch...@chriswilson.tv CW> Hello Time Nuts! CW> Sunday, January 20, 2019 CW> Thanks for all the replies, I am now in e-mail contact with Alexander CW> at the sellers place. He asked last night if there's a jumper on the CW> underside of the GPS board. At first I thought there was a tiny SMC CW> resistor or capacitor. It was in an area where flux residue existed, CW> so looked like a post manufacture addition. Upon cleaning off the CW> residue I now think there IS a solder jumper fro pin 1 of the Ublox CW> to somewhere else, maybe to the power supply area. I wonder if pin 1 CW> is being held high or low? I am impatiently waiting for Alexander to CW> see the photo and advise, what do you guys think? The photo is at CW> http://www.chriswilson.tv/gps.jpg Up to now all attempts to get any CW> output from pin 1 have failed. Thanks for all the replies again! CW> CW> Best regards, CW> Chrismailto:ch...@chriswilson.tv LB>> I have mislead you about NEO-M8T-0-10 TP 2 capabilities, sorry. LB>> https://www.u-blox.com/sites/default/files/products/documents/NEO-LEA-M8T_ProductSummary_%28UBX-16000801%29.pdf LB>> does not differentiate between two outputs and lists range as 0.25Hz-10MHz. LB>> Regarding flash/no-flash bootleg versions - mask ROM firmware LB>> residing on the die does not support FTS functions (there is not LB>> enough space for extra features and increasing the die size would LB>> increase base product cost) so if you have FTS product then it LB>> must have flash inside to run the code from. Whether this flash IC LB>> is of adequate size to accept future updates or whether its LB>> erasing and writing is supported by the main firmware in ROM is a LB>> separate question. It is technically possible to create LB>> operational but non-upgradeable FTS product . LB>> Leo LB>> ___ LB>> time-nuts mailing list -- time-nuts@lists.febo.com LB>> To unsubscribe, go to LB>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com LB>> and follow the instructions there. CW> ___ CW> time-nuts mailing list -- time-nuts@lists.febo.com CW> To unsubscribe, go to CW> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com CW> and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Ublox Neo M8T no output on TP2 question please?
Hello Time Nuts! Sunday, January 20, 2019 Thanks for all the replies, I am now in e-mail contact with Alexander at the sellers place. He asked last night if there's a jumper on the underside of the GPS board. At first I thought there was a tiny SMC resistor or capacitor. It was in an area where flux residue existed, so looked like a post manufacture addition. Upon cleaning off the residue I now think there IS a solder jumper fro pin 1 of the Ublox to somewhere else, maybe to the power supply area. I wonder if pin 1 is being held high or low? I am impatiently waiting for Alexander to see the photo and advise, what do you guys think? The photo is at http://www.chriswilson.tv/gps.jpg Up to now all attempts to get any output from pin 1 have failed. Thanks for all the replies again! Best regards, Chrismailto:ch...@chriswilson.tv LB> I have mislead you about NEO-M8T-0-10 TP 2 capabilities, sorry. LB> https://www.u-blox.com/sites/default/files/products/documents/NEO-LEA-M8T_ProductSummary_%28UBX-16000801%29.pdf LB> does not differentiate between two outputs and lists range as 0.25Hz-10MHz. LB> Regarding flash/no-flash bootleg versions - mask ROM firmware LB> residing on the die does not support FTS functions (there is not LB> enough space for extra features and increasing the die size would LB> increase base product cost) so if you have FTS product then it LB> must have flash inside to run the code from. Whether this flash IC LB> is of adequate size to accept future updates or whether its LB> erasing and writing is supported by the main firmware in ROM is a LB> separate question. It is technically possible to create LB> operational but non-upgradeable FTS product . LB> Leo LB> ___ LB> time-nuts mailing list -- time-nuts@lists.febo.com LB> To unsubscribe, go to LB> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com LB> and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Ublox Neo M8T no output on TP2 question please?
Hello David, Thanks for the reply, it came froma recommended Lithuanian source, where others have no issues with similar devices. I e-mailed them re this but got no rely, sadly. Is there any way to interrogate it (not the suppliers ;)) to see if it's legit? Thursday, January 17, 2019 Best regards, Chrismailto:ch...@chriswilson.tv DJTvtn> 17/01/2019 14:42 DJTvtn> I have a Ublox NEO-M8T-0-10 that in the OE state shows no output on DJTvtn> TP2. If I programme it with the UCentre software for say 500hZ output DJTvtn> I sill see nothing on TP2. Do I need to pull it high on boot or DJTvtn> anything to see an output please? I am not probing it with a X10 scope DJTvtn> probe until after it has booted, so I don't believe it's pulled low on DJTvtn> boot, although I can't see how a X10 probe setting could pull it DJTvtn> anyay. TP0 behaves normally and accepts changes in output frequency. DJTvtn> Otherwise it also seems to generally act correctly. Thanks DJTvtn>Best Regards, DJTvtn>Chris Wilson. DJTvtn> = DJTvtn> Are you sure it's genuine ublox? There are many counterfeits about. DJTvtn> Cheers, DJTvtn> David ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Ublox Neo M8T no output on TP2 question please?
17/01/2019 14:42 I have a Ublox NEO-M8T-0-10 that in the OE state shows no output on TP2. If I programme it with the UCentre software for say 500hZ output I sill see nothing on TP2. Do I need to pull it high on boot or anything to see an output please? I am not probing it with a X10 scope probe until after it has booted, so I don't believe it's pulled low on boot, although I can't see how a X10 probe setting could pull it anyay. TP0 behaves normally and accepts changes in output frequency. Otherwise it also seems to generally act correctly. Thanks -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP3325B as LO for a transceiver or receiver? Phase noise?
Hello all Tuesday, January 1, 2019 Thanks very much for all the replies and the helpful links. I guess I should just try and see then! I much appreciate the trouble people have gone to explaining this although I do not have a full comprehension of measuring phase noise yet ;) Happy New Year! Best regards, Chrismailto:ch...@chriswilson.tv MG> I have done a study of how good it needs to be on my website: MG> https://sites.google.com/site/markstcxomeasurements/ MG> Regards, MG> Mark MG> On Tue, Jan 1, 2019 at 2:34 PM Artek Manuals MG> wrote: >> The question that remains begging here from the original post (maybe off >> topic ?) is how low a phase noise does he really NEED in this >> application? We here at time-nuts tend to think in the 10e-12 minutia >> area, but In this application ( a HF Communications receiver) the 3325B >> may be "good enough" that PN wont really be an issue as a practical >> matter. Don't see who the original poster is from this snippet but a >> possible better place to get a "practical" answer might be over on the >> EEVBlog? >> >> Dave >> manu...@artekmanuals.com >> >> >> On 1/1/2019 3:38 PM, Brooke Clarke wrote: >> > Hi Chris: >> > >> > The HP 8648 Signal Generator was developed to have low phase noise >> > that was needed for testing pagers. >> > See second table of SSB Phase Noise at: >> > https://prc68.com/I/HP8648.shtml >> > >> > -- >> > Have Fun, >> > >> > Brooke Clarke >> > https://www.PRC68.com >> > http://www.end2partygovernment.com/2012Issues.html >> > axioms: >> > 1. The extent to which you can fix or improve something will be >> > limited by how well you understand how it works. >> > 2. Everybody, with no exceptions, holds false beliefs. >> > >> > Original Message >> >> >> >>01/01/2019 14:22 >> >> >> >> Could I use my HP3325B locked to a Trimble Thunderbolt GPS disciplined >> >> 10MHz oscillator as the master LO of my Kenwood TS-590S transceiver >> >> that has a LO at 15.6 MHz, or is the phase noise too great? My VK3HZ >> >> gps disciplened LO replacement died recently, I may be able to repair >> >> it but as they are no longer available I am looking at alternatives to >> >> achieve a very stable frequency. Thanks >> >> >> >> https://www.febo.com/pages/hp3325b/ >> >> >> >> http://www.vk3hz.net/XRef/XRef_Home.html >> >> >> >> -- >> Dave >> manu...@artekmanuals.com >> www.ArtekManuals.com >> >> >> --- >> This email has been checked for viruses by Avast antivirus software. >> https://www.avast.com/antivirus >> >> >> ___ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> MG> ___ MG> time-nuts mailing list -- time-nuts@lists.febo.com MG> To unsubscribe, go to MG> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com MG> and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] HP3325B as LO for a transceiver or receiver? Phase noise?
01/01/2019 14:22 Could I use my HP3325B locked to a Trimble Thunderbolt GPS disciplined 10MHz oscillator as the master LO of my Kenwood TS-590S transceiver that has a LO at 15.6 MHz, or is the phase noise too great? My VK3HZ gps disciplened LO replacement died recently, I may be able to repair it but as they are no longer available I am looking at alternatives to achieve a very stable frequency. Thanks https://www.febo.com/pages/hp3325b/ http://www.vk3hz.net/XRef/XRef_Home.html -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
