[neonixie-l] Re: Numitron Clock: 1V ripple on supply voltage due to PWM?
On Aug 7, 1:41 am, jb-electronics webmas...@jb-electronics.de wrote: I know there are some radio Nixie tube clocks out there, so there's got to be a way. They probably are not multiplexed. All my nixie clocks with multiplexed displays produce lots of RFI that wipes out AM band reception (I would expect it to be even worse at DCF or WWVB frequencies). -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] Re: Numitron Clock: 1V ripple on supply voltage due to PWM?
On Aug 7, 5:01 pm, David Forbes dfor...@dakotacom.net wrote: On 8/7/11 1:41 AM, jb-electronics wrote: David, The short answer: Don't use PWM next to a radio receiver. You are introducing an interfering radio signal. thanks for your reply, however, it is not quite what I was hoping for. Since I have discovered the PWM function on my controller I don't want to miss it anymore. I work on radio telescopes, and we use linear power supplies wherever possible, to reduce RF interference. you might be able to get the clock to receive radio signal while using PWM on the tubes, but you'll spend years getting it to work. It's just not worth the trouble. In the past, I've used systems where I've synched the time/date when the PWM is not in use, e.g. at night when the display is off so no HV required, and used a TXCO during the day. Its a good compromise. Nick -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
Re: [neonixie-l] Re: Numitron Clock: 1V ripple on supply voltage due to PWM?
This is what I did as well on my WWVB clock. At night, when the clock tries to sync, it tuns off both the HVPS and the nixie mux (to get as electrically quiet as possible). You're still going to want to get it away from the other devices that are nearby QRM that you can't turn off via clock (computers, televisions, etc, etc, etc). Nick: That's neat, I didn't know you worked at a radio telescope. Pretty cool. My frame of reference: I am an amateur radio operator, but I also have a wife. So, that means I can't setup antenna farms in the backyard or else I'll wake up to find they've all been cut down and also maybe the locks have been changed. (well, I _do_ have a 2m/440 j-pole on the back deck, but that hardly counts) So, I content myself with running attic antennas. Currently, I have a G5RV-Jr and a G7FEK up there. The G5RV-Jr is a centerfed doublet and it picks up all KINDS of QRM from the house. I can watch the S-meter jump on my FT-840 or Swan 500c when someone turns on a television or computer in the house. So, yes. Electronics (especially large CRT's or anything with fast digital switching) generates plenty of radio noise and if you are trying to receive, your first step is to turn off all the QRM you possibly can. -Adam W7ATJ On Sun, Aug 7, 2011 at 9:14 AM, Nick n...@desmith.net wrote: On Aug 7, 5:01 pm, David Forbes dfor...@dakotacom.net wrote: On 8/7/11 1:41 AM, jb-electronics wrote: David, The short answer: Don't use PWM next to a radio receiver. You are introducing an interfering radio signal. thanks for your reply, however, it is not quite what I was hoping for. Since I have discovered the PWM function on my controller I don't want to miss it anymore. I work on radio telescopes, and we use linear power supplies wherever possible, to reduce RF interference. you might be able to get the clock to receive radio signal while using PWM on the tubes, but you'll spend years getting it to work. It's just not worth the trouble. In the past, I've used systems where I've synched the time/date when the PWM is not in use, e.g. at night when the display is off so no HV required, and used a TXCO during the day. Its a good compromise. Nick -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB. -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
[neonixie-l] Re: Numitron Clock: 1V ripple on supply voltage due to PWM?
On Aug 7, 8:09 pm, Adam Jacobs a...@jacobs.us wrote: Nick: That's neat, I didn't know you worked at a radio telescope. Pretty cool. Not me - that's David. I used to work at an extremely boring hedge fund! Nick -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
Re: [neonixie-l] Re: Numitron Clock: 1V ripple on supply voltage due to PWM?
Hah, my bad. :) On Sun, Aug 7, 2011 at 12:42 PM, Nick n...@desmith.net wrote: On Aug 7, 8:09 pm, Adam Jacobs a...@jacobs.us wrote: Nick: That's neat, I didn't know you worked at a radio telescope. Pretty cool. Not me - that's David. I used to work at an extremely boring hedge fund! Nick -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB. -- You received this message because you are subscribed to the Google Groups neonixie-l group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
