Re: [time-nuts] GPSDO advice
Did you get a newer one with late 2019 at least on the front BG7TBL panel? The one I got doesn't have the frequency offset bug and works really well. It locks on multiple birds really quickly. For the money it's hard to beat. I've been comparing it to my Thunderbolt E. It obviously doesn't provide the extra info you get with Trimble protocol (so no ocxo info in Lady Heather) but I'd say it locks onto a lot more and faster than my Trimble does even if I put it on GPS only constellation for fair playing field. I hate to say it but I'm not sure my Thunderbolt is really much better. You won't be sorry if it's a later BG7TBL GNSS model. I've been running mine on GPS and Galileo lately. Bill On Fri, May 1, 2020, 8:25 PM Wes wrote: > Hi Bob, > > According to the USPS tracking number I'll have a BG7TBL GPSDO on Monday > :-) > > I really wanted to "Buy American" but a 10 dB price difference is worth > taking > the risk. > > Wes > > On 5/1/2020 7:29 PM, Bob kb8tq wrote: > > Hi > > > > I would guess that the vast majority of folks on the list and an even > > larger percentage doing the FMT are buying their GPSDO’s on eBay. > > Which ones they buy and how well the work is very much a “that depends > > sort of thing”. > > > > The crop of devices at low(er) prices changes every 3 to 5 years. > Whatever > > is being torn apart right now will be contributing the low cost stuff. > If you bought > > 5 years ago your choices were very different. Go back 5 or 10 years past > that and > > the devices change again and then again. > > > > There’s no reason to believe that “things were better in the old days”. > Mostly just > > different. The issues have been worked out on stuff that hit eBay 20 > years ago. > > That’s just the way it works. How well they have been worked out …. that > depends > > on the device and how picky you are. > > > > This does not simply apply to GPSDO’s. A while back eBay was awash in > telecom > > Rb’s. Some bought so many they can’t keep track of all of them. Today a > $35 listing > > for an Rb is pretty unusual. That’s just supply and demand. Wait another > 5 or 10 > > years and we probably will be awash in cheap ones again. > > > > Right now “entry level” GPSDO’s are still below $100 delivered. That’s > not all that > > crazy compared to a lot of gear in a typical shack or on a typical bench. > > > > Bob > > > >> On May 1, 2020, at 9:25 PM, Wes wrote: > >> > >> An update on this: > >> > >> I emailed both Jackson and Brandywine for prices on both the Desktop > Fury, in Jackson's case, and the board versions from each of them. > >> > >> The good news is that they both were responsive. The bad news is they > are both out of my price range. Jackson by about 3 dB. Brandywine clearly > didn't want to sell me anything, as exemplified by a fee of $47 to use a > credit card. > >> > >> As much as I would like to be more nutty, I can't justify spending this > kind of money just to participate in ARRL FMTs where the only direction I > have to go is down. > >> > >> Wes N7WS > >> > >> On 4/24/2020 11:56 AM, Wes wrote: > >>> Taking some of the advice offered, I've emailed them for P I'll > let you know if I hear back. > >>> > >>> Wes > >>> > >>> On 4/24/2020 10:45 AM, Kevin Rowett wrote: > > On Apr 24, 2020, at 10:32 AM, Mark Spencer < > m...@alignedsolutions.com> wrote: > > > > Speaking both as an amateur radio operator and some one who modestly > pursues precision time and frequency as a hobby, I am extremely happy with > my Jackson Labs Fury > > GPSDO. > Speaking of Jackson Labs, has anyone heard from them, since the > lockdown commenced? > > KR > > > ___ > 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 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] GPSDO advice
Why not just get a Trimble T-Bolt ? Lots of them are still around. 73, Dick, W1KSZ On Fri, May 1, 2020 at 6:26 PM Wes wrote: > An update on this: > > I emailed both Jackson and Brandywine for prices on both the Desktop Fury, > in > Jackson's case, and the board versions from each of them. > > The good news is that they both were responsive. The bad news is they are > both > out of my price range. Jackson by about 3 dB. Brandywine clearly didn't > want to > sell me anything, as exemplified by a fee of $47 to use a credit card. > > As much as I would like to be more nutty, I can't justify spending this > kind of > money just to participate in ARRL FMTs where the only direction I have to > go is > down. > > Wes N7WS > > On 4/24/2020 11:56 AM, Wes wrote: > > Taking some of the advice offered, I've emailed them for P I'll let > you > > know if I hear back. > > > > Wes > > > > On 4/24/2020 10:45 AM, Kevin Rowett wrote: > >>> On Apr 24, 2020, at 10:32 AM, Mark Spencer > wrote: > >>> > >>> Speaking both as an amateur radio operator and some one who modestly > pursues > >>> precision time and frequency as a hobby, I am extremely happy with my > >>> Jackson Labs Fury > >>> GPSDO. > >> > >> Speaking of Jackson Labs, has anyone heard from them, since the > lockdown > >> commenced? > >> > >> KR > > > > > ___ > 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 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] GPSDO advice
Hi Bob, According to the USPS tracking number I'll have a BG7TBL GPSDO on Monday :-) I really wanted to "Buy American" but a 10 dB price difference is worth taking the risk. Wes On 5/1/2020 7:29 PM, Bob kb8tq wrote: Hi I would guess that the vast majority of folks on the list and an even larger percentage doing the FMT are buying their GPSDO’s on eBay. Which ones they buy and how well the work is very much a “that depends sort of thing”. The crop of devices at low(er) prices changes every 3 to 5 years. Whatever is being torn apart right now will be contributing the low cost stuff. If you bought 5 years ago your choices were very different. Go back 5 or 10 years past that and the devices change again and then again. There’s no reason to believe that “things were better in the old days”. Mostly just different. The issues have been worked out on stuff that hit eBay 20 years ago. That’s just the way it works. How well they have been worked out …. that depends on the device and how picky you are. This does not simply apply to GPSDO’s. A while back eBay was awash in telecom Rb’s. Some bought so many they can’t keep track of all of them. Today a $35 listing for an Rb is pretty unusual. That’s just supply and demand. Wait another 5 or 10 years and we probably will be awash in cheap ones again. Right now “entry level” GPSDO’s are still below $100 delivered. That’s not all that crazy compared to a lot of gear in a typical shack or on a typical bench. Bob On May 1, 2020, at 9:25 PM, Wes wrote: An update on this: I emailed both Jackson and Brandywine for prices on both the Desktop Fury, in Jackson's case, and the board versions from each of them. The good news is that they both were responsive. The bad news is they are both out of my price range. Jackson by about 3 dB. Brandywine clearly didn't want to sell me anything, as exemplified by a fee of $47 to use a credit card. As much as I would like to be more nutty, I can't justify spending this kind of money just to participate in ARRL FMTs where the only direction I have to go is down. Wes N7WS On 4/24/2020 11:56 AM, Wes wrote: Taking some of the advice offered, I've emailed them for P I'll let you know if I hear back. Wes On 4/24/2020 10:45 AM, Kevin Rowett wrote: On Apr 24, 2020, at 10:32 AM, Mark Spencer wrote: Speaking both as an amateur radio operator and some one who modestly pursues precision time and frequency as a hobby, I am extremely happy with my Jackson Labs Fury GPSDO. Speaking of Jackson Labs, has anyone heard from them, since the lockdown commenced? KR ___ 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] GPSDO advice
Hi I would guess that the vast majority of folks on the list and an even larger percentage doing the FMT are buying their GPSDO’s on eBay. Which ones they buy and how well the work is very much a “that depends sort of thing”. The crop of devices at low(er) prices changes every 3 to 5 years. Whatever is being torn apart right now will be contributing the low cost stuff. If you bought 5 years ago your choices were very different. Go back 5 or 10 years past that and the devices change again and then again. There’s no reason to believe that “things were better in the old days”. Mostly just different. The issues have been worked out on stuff that hit eBay 20 years ago. That’s just the way it works. How well they have been worked out …. that depends on the device and how picky you are. This does not simply apply to GPSDO’s. A while back eBay was awash in telecom Rb’s. Some bought so many they can’t keep track of all of them. Today a $35 listing for an Rb is pretty unusual. That’s just supply and demand. Wait another 5 or 10 years and we probably will be awash in cheap ones again. Right now “entry level” GPSDO’s are still below $100 delivered. That’s not all that crazy compared to a lot of gear in a typical shack or on a typical bench. Bob > On May 1, 2020, at 9:25 PM, Wes wrote: > > An update on this: > > I emailed both Jackson and Brandywine for prices on both the Desktop Fury, in > Jackson's case, and the board versions from each of them. > > The good news is that they both were responsive. The bad news is they are > both out of my price range. Jackson by about 3 dB. Brandywine clearly didn't > want to sell me anything, as exemplified by a fee of $47 to use a credit card. > > As much as I would like to be more nutty, I can't justify spending this kind > of money just to participate in ARRL FMTs where the only direction I have to > go is down. > > Wes N7WS > > On 4/24/2020 11:56 AM, Wes wrote: >> Taking some of the advice offered, I've emailed them for P I'll let you >> know if I hear back. >> >> Wes >> >> On 4/24/2020 10:45 AM, Kevin Rowett wrote: On Apr 24, 2020, at 10:32 AM, Mark Spencer wrote: Speaking both as an amateur radio operator and some one who modestly pursues precision time and frequency as a hobby, I am extremely happy with my Jackson Labs Fury GPSDO. >>> >>> Speaking of Jackson Labs, has anyone heard from them, since the lockdown >>> commenced? >>> >>> KR >> > > > ___ > 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 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] Interesting 1-60 MHz =/- 50 ppb Stratum-3 TCXO chip
Looking at the datasheet it doesn't look like you'd win any ADEV competitions with it but it's small and the DCTXCO version would be nice to use the I2C interface and it says frequency control resolution as low as 5 ppt. It has uses I can see. Bill On Fri, May 1, 2020, 5:50 PM Richard Solomon wrote: > Been there, did a search on the part number and came up empty. > > They did have a "Request Samples" button so I filled out the form. Let's > see what happens. > > 73, Dick, W1KSZ > > On Fri, May 1, 2020, 5:40 PM jimlux wrote: > > > On 5/1/20 5:00 PM, Richard Solomon wrote: > > > Where do you buy these ? Their web site was not too illuminating. > > > > > > > > > digikey and mouser carry a lot of SiTime parts, including eval boards. > > > > > > > Tnx, Dick, W1KSZ > > > > > > On Fri, May 1, 2020, 4:31 PM mp...@clanbaker.org > > > wrote: > > > > > >> Hello, time Nutters-- > > >> > > >> I have been phase locking the freq counters in my HP 6-GHz VNA, > > Tektronix > > >> spectrum analyzer and bench freq counter to the 10 MHz signal from > > >> a Trimble Thunderbolt via a 4-port distribution box and long coax > cables > > >> to each of the instruments. This works well but is a pain in the tush > > >> connecting to long coax cables when the bench test gear are moved > > around. > > >> > > >> A friend suggested looking into some MEMS TCXO's made by SiTime to > > >> do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. > > One > > >> of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. > > >> > > >> https://www.sitime.com/products/super-tcxos/sit5358 > > >> > > >> I am wondering what any feedback thoughts might be on this from > > >> the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is > > >> available. What say the Time-Nutters gang about this approach for > > >> incorporating a small SiT5358 eval-PCB board into my bench test > > >> gear for phase locking to? I am also wondering which of the > > >> SuperStratum3 TCXO chips might be the best choice for a project > > >> like this? > > >> > > >> Any feedback on this is most welcome! > > >> > > >> Mike Baker > > >> Gainesville/Micanopy, Florida > > >> * > > >> > > >> > > >> > > >> ___ > > >> 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 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 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 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 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] GPSDO advice
An update on this: I emailed both Jackson and Brandywine for prices on both the Desktop Fury, in Jackson's case, and the board versions from each of them. The good news is that they both were responsive. The bad news is they are both out of my price range. Jackson by about 3 dB. Brandywine clearly didn't want to sell me anything, as exemplified by a fee of $47 to use a credit card. As much as I would like to be more nutty, I can't justify spending this kind of money just to participate in ARRL FMTs where the only direction I have to go is down. Wes N7WS On 4/24/2020 11:56 AM, Wes wrote: Taking some of the advice offered, I've emailed them for P I'll let you know if I hear back. Wes On 4/24/2020 10:45 AM, Kevin Rowett wrote: On Apr 24, 2020, at 10:32 AM, Mark Spencer wrote: Speaking both as an amateur radio operator and some one who modestly pursues precision time and frequency as a hobby, I am extremely happy with my Jackson Labs Fury GPSDO. Speaking of Jackson Labs, has anyone heard from them, since the lockdown commenced? KR ___ 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] FE-5680A - Newbie capacitor question
If it's a filter cap on the output of an LDO voltage regulator (at 1 uF it is probably not) be aware that a lot of LDO regulators have problems with very low ESR caps. Check the LDO data sheet for acceptable values. ___ 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] Interesting 1-60 MHz =/- 50 ppb Stratum-3 TCXO chip
Hi If the idea is to run things standalone, a generic eBay OCXO would work better than these devices. The OCXO would be more stable. It also should be lower noise / better ADEV. If the idea is to lock these up to the TBolt, it’s not at all clear what benefit that would have. Bob > On May 1, 2020, at 8:07 PM, mp...@clanbaker.org wrote: > > Hello, time Nutters-- > > I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix > spectrum analyzer and bench freq counter to the 10 MHz signal from > a Trimble Thunderbolt via a 4-port distribution box and long coax cables > to each of the instruments. This works well but is a pain in the tush > connecting to long coax cables when the bench test gear are moved around. > > A friend suggested looking into some MEMS TCXO's made by SiTime to > do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. One > of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. > > https://www.sitime.com/products/super-tcxos/sit5358 > > I am wondering what any feedback thoughts might be on this from > the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is > available. What say the Time-Nutters gang about this approach for > incorporating a small SiT5358 eval-PCB board into my bench test > gear for phase locking to? I am also wondering which of the > SuperStratum3 TCXO chips might be the best choice for a project > like this? > > Any feedback on this is most welcome! > > Mike Baker > Gainesville/Micanopy, Florida > * > > > > ___ > 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 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] Interesting 1-60 MHz =/- 50 ppb Stratum-3 TCXO chip
Been there, did a search on the part number and came up empty. They did have a "Request Samples" button so I filled out the form. Let's see what happens. 73, Dick, W1KSZ On Fri, May 1, 2020, 5:40 PM jimlux wrote: > On 5/1/20 5:00 PM, Richard Solomon wrote: > > Where do you buy these ? Their web site was not too illuminating. > > > > > digikey and mouser carry a lot of SiTime parts, including eval boards. > > > > Tnx, Dick, W1KSZ > > > > On Fri, May 1, 2020, 4:31 PM mp...@clanbaker.org > > wrote: > > > >> Hello, time Nutters-- > >> > >> I have been phase locking the freq counters in my HP 6-GHz VNA, > Tektronix > >> spectrum analyzer and bench freq counter to the 10 MHz signal from > >> a Trimble Thunderbolt via a 4-port distribution box and long coax cables > >> to each of the instruments. This works well but is a pain in the tush > >> connecting to long coax cables when the bench test gear are moved > around. > >> > >> A friend suggested looking into some MEMS TCXO's made by SiTime to > >> do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. > One > >> of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. > >> > >> https://www.sitime.com/products/super-tcxos/sit5358 > >> > >> I am wondering what any feedback thoughts might be on this from > >> the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is > >> available. What say the Time-Nutters gang about this approach for > >> incorporating a small SiT5358 eval-PCB board into my bench test > >> gear for phase locking to? I am also wondering which of the > >> SuperStratum3 TCXO chips might be the best choice for a project > >> like this? > >> > >> Any feedback on this is most welcome! > >> > >> Mike Baker > >> Gainesville/Micanopy, Florida > >> * > >> > >> > >> > >> ___ > >> 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 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 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 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] FE-5680A - Newbie capacitor question
Okay, I think I'm beginning to get it. I reread some articles about ESR with fresh eyes and what you wrote makes sense. Since I won't be ordering many of them, it looks like a safer bet to purchase a 10%, 1.5 Ohm ESR capacitor (Kemet PN: T495B105K035ATE1K5, Mouser PN: 80-T495B105K35ATE1K5). I figured the lower tolerance was good, but at the late hour I was researching everything, the ESR was messing me up. Thank you for helping me understand more about these capacitors, I really appreciate it. - John N5JT ‐‐‐ Original Message ‐‐‐ On Friday, May 1, 2020 6:02 PM, Bob kb8tq wrote: > Hi > > The only way to work out what you have is to find the data sheet on that > part. It should translate > between the manufacturer’s markings and the exact part number. That part > number will tell you as > much as can be known about the part. Some data sheets are a lot more complete > than others. > > There is no risk (other than financial) in putting a 5% part in place of a > 20%. There also is very little > risk in going for the low(er) ESR. > > If the part is just a bypass, even the value is a bit open. If the cap is in > a filter or on the output of a switcher, > things may be a bit tighter. > > Bob > > > On May 1, 2020, at 5:42 PM, John Bievenour j...@bvnhr.net wrote: > > I'm an amateur electronics hobbyist who's still a newbie (especially to > > SMD), so please forgive the basic question. > > I recently acquired a FE-5680A that was failing to lock on frequency (pin 3 > > never went low). It will power up, sweep up and down, and finally settle to > > fluctuate around 9.999 to 10.000. > > When I opened the case, I found that one of the capacitors had blown, which > > I believe might be the reason. Looking at the top of the board, with the > > DB9 on your left, the capacitor in question directly across from the right > > hand 2941 voltage regulator. It has 105 on the first row, 35 followed by a > > stylized K on the second row, and 333 on the last row. > > I'd like to attempt to replace the blown cap. After doing lots of searching > > and reading, I'm pretty sure this is a Kemet 35 VDC 1uF SMD Tantalum > > Capacitor (never knew these existed until yesterday). I've narrowed down > > the options on Mouser, but I can't figure out: > > > > 1. is my identification correct? > > 2. is it a T489, T491, T494, T495, T496, T498, or T499 (the band at the > > top makes me think it's a T498, T491, T494, T495, T498, or a T499) ? > > 3. is the tolerance 10% or 20% (I think it's 10%)? > > 4. what is the ESR (I have options from 1 Ohm to 83 mOhms)? > > 5. for future reference, how am I able to tell the tolerance, ESR, and > > series just by decoding the writing on it? > > > > Thank you very much in advance. > > > > - John > > > > 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 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] Interesting 1-60 MHz =/- 50 ppb Stratum-3 TCXO chip
On 5/1/20 5:00 PM, Richard Solomon wrote: Where do you buy these ? Their web site was not too illuminating. digikey and mouser carry a lot of SiTime parts, including eval boards. Tnx, Dick, W1KSZ On Fri, May 1, 2020, 4:31 PM mp...@clanbaker.org wrote: Hello, time Nutters-- I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix spectrum analyzer and bench freq counter to the 10 MHz signal from a Trimble Thunderbolt via a 4-port distribution box and long coax cables to each of the instruments. This works well but is a pain in the tush connecting to long coax cables when the bench test gear are moved around. A friend suggested looking into some MEMS TCXO's made by SiTime to do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. One of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. https://www.sitime.com/products/super-tcxos/sit5358 I am wondering what any feedback thoughts might be on this from the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is available. What say the Time-Nutters gang about this approach for incorporating a small SiT5358 eval-PCB board into my bench test gear for phase locking to? I am also wondering which of the SuperStratum3 TCXO chips might be the best choice for a project like this? Any feedback on this is most welcome! Mike Baker Gainesville/Micanopy, Florida * ___ 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 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 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] Interesting 1-60 MHz =/- 50 ppb Stratum-3 TCXO chip
Where do you buy these ? Their web site was not too illuminating. Tnx, Dick, W1KSZ On Fri, May 1, 2020, 4:31 PM mp...@clanbaker.org wrote: > Hello, time Nutters-- > > I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix > spectrum analyzer and bench freq counter to the 10 MHz signal from > a Trimble Thunderbolt via a 4-port distribution box and long coax cables > to each of the instruments. This works well but is a pain in the tush > connecting to long coax cables when the bench test gear are moved around. > > A friend suggested looking into some MEMS TCXO's made by SiTime to > do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. One > of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. > > https://www.sitime.com/products/super-tcxos/sit5358 > > I am wondering what any feedback thoughts might be on this from > the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is > available. What say the Time-Nutters gang about this approach for > incorporating a small SiT5358 eval-PCB board into my bench test > gear for phase locking to? I am also wondering which of the > SuperStratum3 TCXO chips might be the best choice for a project > like this? > > Any feedback on this is most welcome! > > Mike Baker > Gainesville/Micanopy, Florida > * > > > > ___ > 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 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] power supplies
I’d give a “thumbs up” for the Acopian supplies, too. I have several and they get used regularly. I haven’t had one die on me yet (knocks on head) Steve WB0DBS > On May 1, 2020, at 6:23 PM, jimlux wrote: > > On 5/1/20 12:07 PM, Tim Shoppa wrote: >> Jim, when it comes to "bench supplies" - knobs for voltage and meters - >> most of the commonly available Chinese bench supplies in the under 3A-range >> are linear with series regulator. >> This unit (HY1803D) is typical and has a transformer (relay-selected >> winding depending on the voltage setting) and a 2N3055 heat sink on the >> back. >> http://www.mastechpowersupplies.com/variable-regulated-power-supply-hy1803d.html >> After you get to the 5A range they start becoming switchers. There are only >> a couple of common designs with different trim and brand names on the front. >> Of course old-school (50's-80's era) regulated HP bench supplies are >> commonly available on the surplus market and they are built like tanks and >> pretty much infinitely repairable as long as the meters haven't been >> smashed in. > > > > True, but these days, I'd rather fool with oscillators and mixers than power > supply repair. I've kind of gotten out of the "buy old surplus gear and make > do" phase. Although if you go somewhere like the San Bernardino Microwave > Society meetings, there's people there with literal truck loads of old test > gear, for which I would have sold my future children into bondage for, when > it was only 20 years old - of course, now it's 50 years old. > > I'm past the thrill of running a 1980s sweeper or the venerable 8640 signal > generator. > > Hence the question about "off the shelf bench power supplies" > > > > > >> I would be reluctant to use a bench supply for long-term use because you >> bump that knob and what was supposed to be 3.3V becomes 18V. > > > Uh, no, I'd never do that, no, uh-uh. At JPL we have bunches of overvoltage > protector widgets from some company I can't remember, banana plugs or wires, > external to the bench supply. If you go over 5.25V, it crowbars. > > >> Few to no current production wall warts are linear. Power-conserving >> regulations around the world now pretty much require wall warts to be >> switchers. Linear (including regulated) wall warts are still available from >> the surplus outlets but they are less common than before. > > yeah, i've got a box of those older linear warts - a transformer, a diode, > maybe a bridge, and maybe a capacitor. Good for stuff like running LEDs or > small motors. > > >> Few to no current production modular fixed-voltage supplies are linear. >> With a handful of exceptions (I think a couple of the Lambda linear modules >> are still available) they are almost all switchers. > > Acopian is your friend for linear "bricks". > > https://www.acopian.com/linear-regulated-power-supply-models.html > > That familiar gold box is a common sight. > > > > ___ > 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 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] Interesting 1-60 MHz =/- 50 ppb Stratum-3 TCXO chip
Hello, time Nutters-- I have been phase locking the freq counters in my HP 6-GHz VNA, Tektronix spectrum analyzer and bench freq counter to the 10 MHz signal from a Trimble Thunderbolt via a 4-port distribution box and long coax cables to each of the instruments. This works well but is a pain in the tush connecting to long coax cables when the bench test gear are moved around. A friend suggested looking into some MEMS TCXO's made by SiTime to do this with. SiTime offers a wide variety of Stratum-3 TCXO chips. One of them is the SiT5358 which is spec'd at 0.05 ppm from 1 to 60 MHz. https://www.sitime.com/products/super-tcxos/sit5358 I am wondering what any feedback thoughts might be on this from the Time-Nuts gang? An eval-PCB board for the SiT5358 chip is available. What say the Time-Nutters gang about this approach for incorporating a small SiT5358 eval-PCB board into my bench test gear for phase locking to? I am also wondering which of the SuperStratum3 TCXO chips might be the best choice for a project like this? Any feedback on this is most welcome! Mike Baker Gainesville/Micanopy, Florida * ___ 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] power supplies
On 5/1/20 12:07 PM, Tim Shoppa wrote: Jim, when it comes to "bench supplies" - knobs for voltage and meters - most of the commonly available Chinese bench supplies in the under 3A-range are linear with series regulator. This unit (HY1803D) is typical and has a transformer (relay-selected winding depending on the voltage setting) and a 2N3055 heat sink on the back. http://www.mastechpowersupplies.com/variable-regulated-power-supply-hy1803d.html After you get to the 5A range they start becoming switchers. There are only a couple of common designs with different trim and brand names on the front. Of course old-school (50's-80's era) regulated HP bench supplies are commonly available on the surplus market and they are built like tanks and pretty much infinitely repairable as long as the meters haven't been smashed in. True, but these days, I'd rather fool with oscillators and mixers than power supply repair. I've kind of gotten out of the "buy old surplus gear and make do" phase. Although if you go somewhere like the San Bernardino Microwave Society meetings, there's people there with literal truck loads of old test gear, for which I would have sold my future children into bondage for, when it was only 20 years old - of course, now it's 50 years old. I'm past the thrill of running a 1980s sweeper or the venerable 8640 signal generator. Hence the question about "off the shelf bench power supplies" I would be reluctant to use a bench supply for long-term use because you bump that knob and what was supposed to be 3.3V becomes 18V. Uh, no, I'd never do that, no, uh-uh. At JPL we have bunches of overvoltage protector widgets from some company I can't remember, banana plugs or wires, external to the bench supply. If you go over 5.25V, it crowbars. Few to no current production wall warts are linear. Power-conserving regulations around the world now pretty much require wall warts to be switchers. Linear (including regulated) wall warts are still available from the surplus outlets but they are less common than before. yeah, i've got a box of those older linear warts - a transformer, a diode, maybe a bridge, and maybe a capacitor. Good for stuff like running LEDs or small motors. Few to no current production modular fixed-voltage supplies are linear. With a handful of exceptions (I think a couple of the Lambda linear modules are still available) they are almost all switchers. Acopian is your friend for linear "bricks". https://www.acopian.com/linear-regulated-power-supply-models.html That familiar gold box is a common sight. ___ 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] power supplies
On 5/1/20 1:11 PM, Mark Sims wrote: Yes, Power Designs units are VERY good. Some (their precision models) are insanely good. They have a cult following and can be a bit pricey these days. There are lots of posts on eevblog.com about them. Dave did a video on one of the precision units. https://www.eevblog.com/forum/testgear/power-designs-power-supplies-database/msg2801534/#msg2801534 Lots of PowerDesigns 2010, 2020, etc. at JPL Not in cal, some have broken features, but used all over the place. (In fact, though we are teleworking, there's one powering a Wenzel 10MHz OCXO on my desk at work, right now. the current meter doesn't work for some reason, but that's what the DMM was for) Seems they're $150-ish used ___ 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] FE-5680A - Newbie capacitor question
Hi The only way to work out what you have is to find the data sheet on that part. It *should* translate between the manufacturer’s markings and the exact part number. That part number will tell you as much as can be known about the part. Some data sheets are a lot more complete than others. There is no risk (other than financial) in putting a 5% part in place of a 20%. There also is very little risk in going for the low(er) ESR. If the part is just a bypass, even the value is a bit open. If the cap is in a filter or on the output of a switcher, things may be a bit tighter. Bob > On May 1, 2020, at 5:42 PM, John Bievenour wrote: > > I'm an amateur electronics hobbyist who's still a newbie (especially to SMD), > so please forgive the basic question. > > I recently acquired a FE-5680A that was failing to lock on frequency (pin 3 > never went low). It will power up, sweep up and down, and finally settle to > fluctuate around 9.999 to 10.000. > > When I opened the case, I found that one of the capacitors had blown, which I > believe might be the reason. Looking at the top of the board, with the DB9 on > your left, the capacitor in question directly across from the right hand 2941 > voltage regulator. It has 105 on the first row, 35 followed by a stylized K > on the second row, and 333 on the last row. > > I'd like to attempt to replace the blown cap. After doing lots of searching > and reading, I'm pretty sure this is a Kemet 35 VDC 1uF SMD Tantalum > Capacitor (never knew these existed until yesterday). I've narrowed down the > options on Mouser, but I can't figure out: > > 1) is my identification correct? > 2) is it a T489, T491, T494, T495, T496, T498, or T499 (the band at the top > makes me think it's a T498, T491, T494, T495, T498, or a T499) ? > 3) is the tolerance 10% or 20% (I think it's 10%)? > 4) what is the ESR (I have options from 1 Ohm to 83 mOhms)? > 5) for future reference, how am I able to tell the tolerance, ESR, and series > just by decoding the writing on it? > > Thank you very much in advance. > - John > ___ > 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 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] FE-5680A - Newbie capacitor question
I'm an amateur electronics hobbyist who's still a newbie (especially to SMD), so please forgive the basic question. I recently acquired a FE-5680A that was failing to lock on frequency (pin 3 never went low). It will power up, sweep up and down, and finally settle to fluctuate around 9.999 to 10.000. When I opened the case, I found that one of the capacitors had blown, which I believe might be the reason. Looking at the top of the board, with the DB9 on your left, the capacitor in question directly across from the right hand 2941 voltage regulator. It has 105 on the first row, 35 followed by a stylized K on the second row, and 333 on the last row. I'd like to attempt to replace the blown cap. After doing lots of searching and reading, I'm pretty sure this is a Kemet 35 VDC 1uF SMD Tantalum Capacitor (never knew these existed until yesterday). I've narrowed down the options on Mouser, but I can't figure out: 1) is my identification correct? 2) is it a T489, T491, T494, T495, T496, T498, or T499 (the band at the top makes me think it's a T498, T491, T494, T495, T498, or a T499) ? 3) is the tolerance 10% or 20% (I think it's 10%)? 4) what is the ESR (I have options from 1 Ohm to 83 mOhms)? 5) for future reference, how am I able to tell the tolerance, ESR, and series just by decoding the writing on it? Thank you very much in advance. - John ___ 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] power supplies
Hi You don’t have to get into the fancy versions to get a nice quiet supply. One of the guys at Frequency Electronics (I forget who …) turned me on to them back in the 1970’s. I have not seen any of them selling for the sort of prices some other supplies seem to command …. Maybe I just spend more time digging. Bob > On May 1, 2020, at 4:11 PM, Mark Sims wrote: > > Yes, Power Designs units are VERY good. Some (their precision models) are > insanely good. They have a cult following and can be a bit pricey these > days. There are lots of posts on eevblog.com about them. Dave did a video > on one of the precision units. > > https://www.eevblog.com/forum/testgear/power-designs-power-supplies-database/msg2801534/#msg2801534 > > - > >> Spend some time on eBay looking for Power Designs bench supplies. > ___ > 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 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] power supplies
Yes, Power Designs units are VERY good. Some (their precision models) are insanely good. They have a cult following and can be a bit pricey these days. There are lots of posts on eevblog.com about them. Dave did a video on one of the precision units. https://www.eevblog.com/forum/testgear/power-designs-power-supplies-database/msg2801534/#msg2801534 - >Spend some time on eBay looking for Power Designs bench supplies. ___ 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] power supplies
I love my R NGT20, I have several of them. Reasonably clean, analog, uA741 technology, no switcher, knobs for everything. 3 independent, unconnected outputs: 2* 0-20V@1A for op amps etc 1*0-6V@5A for the digital stuff for example: < https://www.ebay.de/itm/Rohde-Schwarz-DC-Power-Supply-Stromversorgungsgerat-Typ-NGT-20/193258127587?hash=item2cff1500e3:g:v6wAAOSwlnVd9j7J > I have measured some of the devices I have here to see how much there was to filter for my analog toys: < http://www.hoffmann-hochfrequenz.de/downloads/Noise_Measurements_On_Some_Laboratory_Power_Supplies.pdf > For the NGT20 that was not much. The HP6633B: OMG!!! Cheers, Gerhard Am 01.05.20 um 20:51 schrieb jimlux: What with telework, I'm doing more timenuts-ey stuff at home, and the power supply conundrum has come up. There's a plethora of interesting widgets scattered across my bench requiring variously, 5V, 8V, 12V, and 15V. I've got a box full of various fixed voltage supplies, mostly linear, picked up over the years. I suppose I can package a bunch of those up in a bigger box with banana jacks or binding posts. And then there's some things where you'd like current limiting and/or variable voltage. So I've started looking at inexpensive bench power supplies - there appear to be dozens, if not hundreds, of these available. There must be dozens that are all very similar - They're switchers for the most part, displays, etc. for $50-100, from different vendors, all similar. Are they essentially commodity? Or are there particular brands that are good or bad? Are they all noisy? Weird UI problems (7 menu layers with a single knob)? ___ 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] power supplies
Hi Spend some time on eBay looking for Power Designs bench supplies. They went out of business years ago so they are not a popular item. Thus the price is usually pretty reasonable. I have never seen one that was a switcher…. Bob > On May 1, 2020, at 2:51 PM, jimlux wrote: > > What with telework, I'm doing more timenuts-ey stuff at home, and the power > supply conundrum has come up. > > There's a plethora of interesting widgets scattered across my bench requiring > variously, 5V, 8V, 12V, and 15V. > > I've got a box full of various fixed voltage supplies, mostly linear, picked > up over the years. > I suppose I can package a bunch of those up in a bigger box with banana jacks > or binding posts. > > > And then there's some things where you'd like current limiting and/or > variable voltage. > > So I've started looking at inexpensive bench power supplies - there appear to > be dozens, if not hundreds, of these available. There must be dozens that > are all very similar - They're switchers for the most part, displays, etc. > for $50-100, from different vendors, all similar. > > Are they essentially commodity? Or are there particular brands that are good > or bad? > > Are they all noisy? > > Weird UI problems (7 menu layers with a single knob)? > > > ___ > 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 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] power supplies
Jim, when it comes to "bench supplies" - knobs for voltage and meters - most of the commonly available Chinese bench supplies in the under 3A-range are linear with series regulator. This unit (HY1803D) is typical and has a transformer (relay-selected winding depending on the voltage setting) and a 2N3055 heat sink on the back. http://www.mastechpowersupplies.com/variable-regulated-power-supply-hy1803d.html After you get to the 5A range they start becoming switchers. There are only a couple of common designs with different trim and brand names on the front. Of course old-school (50's-80's era) regulated HP bench supplies are commonly available on the surplus market and they are built like tanks and pretty much infinitely repairable as long as the meters haven't been smashed in. I would be reluctant to use a bench supply for long-term use because you bump that knob and what was supposed to be 3.3V becomes 18V. Few to no current production wall warts are linear. Power-conserving regulations around the world now pretty much require wall warts to be switchers. Linear (including regulated) wall warts are still available from the surplus outlets but they are less common than before. Few to no current production modular fixed-voltage supplies are linear. With a handful of exceptions (I think a couple of the Lambda linear modules are still available) they are almost all switchers. Tim N3QE On Fri, May 1, 2020 at 2:52 PM jimlux wrote: > What with telework, I'm doing more timenuts-ey stuff at home, and the > power supply conundrum has come up. > > There's a plethora of interesting widgets scattered across my bench > requiring variously, 5V, 8V, 12V, and 15V. > > I've got a box full of various fixed voltage supplies, mostly linear, > picked up over the years. > I suppose I can package a bunch of those up in a bigger box with banana > jacks or binding posts. > > > And then there's some things where you'd like current limiting and/or > variable voltage. > > So I've started looking at inexpensive bench power supplies - there > appear to be dozens, if not hundreds, of these available. There must be > dozens that are all very similar - They're switchers for the most part, > displays, etc. for $50-100, from different vendors, all similar. > > Are they essentially commodity? Or are there particular brands that are > good or bad? > > Are they all noisy? > > Weird UI problems (7 menu layers with a single knob)? > > > ___ > 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 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] power supplies
If you are patient, you can find Sorensen/Xantrex/Ametek programmable power supplies on eBay for reasonable prices. Some of them are linear, some switching. High quality stuff. The XT series are linear bench supplies. -Pete > On May 1, 2020, at 11:51, jimlux wrote: > > What with telework, I'm doing more timenuts-ey stuff at home, and the power > supply conundrum has come up. > > There's a plethora of interesting widgets scattered across my bench requiring > variously, 5V, 8V, 12V, and 15V. > > I've got a box full of various fixed voltage supplies, mostly linear, picked > up over the years. > I suppose I can package a bunch of those up in a bigger box with banana jacks > or binding posts. > > > And then there's some things where you'd like current limiting and/or > variable voltage. > > So I've started looking at inexpensive bench power supplies - there appear to > be dozens, if not hundreds, of these available. There must be dozens that > are all very similar - They're switchers for the most part, displays, etc. > for $50-100, from different vendors, all similar. > > Are they essentially commodity? Or are there particular brands that are good > or bad? > > Are they all noisy? > > Weird UI problems (7 menu layers with a single knob)? > > > ___ > 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 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] Salvaged OCXO by ar electronique
Bob kb8tq writes: > If you have not already spotted a Vref pin on the unit, your magic > 8V pin may be the Vref for the EFC. It also could be “factory use only / > do not connect “. Thanks - I think I did spot such a pin: there's 5.3V suspicuously close to the tuning input, and wiring a pot to it with the wiper to tune appears to do the right thing. I guess the 8V will have to remain a mystery then… Here is my current best guess in case someone else searches the archives in the same situation: +---+ 10 MHz sine | o o | 12V --, 1.3Vpp | | | connected to | micrOSTAR-FB 509 | | supply on PCB | (top view)| | 250mA…100mA GND | o o | 12V --^ | | | | 5V3 out | o | TUNE | o o | Mystery 8V out, measures open on PCB +---+ > There are OCXO’s on eBay in the < $30 range that should do about as > well as what the spec sheet shows for the part you have. The unanswerable > question is of course “which ones?”. As noted in many posts sorting > through this and that to find a good part is never easy. I skimmed the archives in that regard before, but thought I'd get this DVB-modulator instead - the same price but lots of extra RF critters (and a too-large-to-be-useful machined aluminum case). Thanks also for the off-list mail from Tim about what to expect from the tuning pin. The entire unit actually had a 1PPS-input, but it went into the FPGA on the digital board. The connections were +--+++ | RF board | --10MHz--> | digital board | <-- SMA "1-pps" | w/ OCXO | <---IF | w/ 300MHz DAC | <-- rs485 +--+++ rs485--^ So maybe the oven was not disciplined and the digital side just shifted the IF around to compensate. Both had a PIC controller with a rs485 connection to the outside world though, so something external could have talked to both and adjust a DAC to the oven, although I didn't spot a discrete one on the PCB yet. I don't have a frequency counter in the shack, so I improvised with my HackRF (0.5ppm-TCXO). To take a closer look at its performance and tuning it, I'm squaring the OCXO with a 74AC04 and look at a high-resolution-FFT of the 200th overtone. The FFT-bins are 0.1Hz wide. Here's a screenshot of the warmup. The screen is 190Hz wide (apparently gqrx can't draw sensible axis labels for such a high resolution FFT) http://aurora.npff.co/~andreas/ofen2.jpg (110kB) I guess this is what the texbooks say a SC-cut warmup curve should look like. The residual drift is probably the TCXO in the Hackrf: Touching the HackRF causes dents in the curve while touching the oven doesn't cause a visible change. regards, Andreas ___ 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.
