[time-nuts] Lady Heather for Z3801A

Does Lady Heather software support the HP Z3801A GPSDO? I recently read that it supports "most GPS receivers" but I have not heard that it supports the Z3801A. It would be great if it can do this... -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland)

[time-nuts] Lady Heather's Tbolt oscillator auto-tune function

Here is a plot of the Thunderbolt cold starting with the "initial DAC voltage" setting set to the peak value of the initial spike (and not the 10.00 MHz setting). The upward spike when the unit starts tracking sats (it took around twice as long to start tracking sats) is gone, but the DAC

Re: [time-nuts] HP 105B Battery the saga continues

How did you come up with the 33,000 uF number, Perry, and is it one big capacitor or lots of little ones tied together? The big cap will also filter out some of the remaining ripple in the power supply that may have been managed by the ni-cad battery. Jeremy On 9/17/2016 3:50 PM, Perry

[time-nuts] HP 105B Battery the saga continues

Hi, The battery problem becomes more convoluted every day. Due to family medical issues I have not been able to do any testing/repairing. The 105B charger is set up for nicads using some selected un-alterable charging rate so to use an internal lead acid setup requires a different ps. My unit

Re: [time-nuts] HP-105B Battery Replacement?

Hi Attila: The difference in chemistry I got from "Handbook of Batteries" 3rd ed, 2001. Your comments about modern chargers are correct, but this thread is about the HP 105 which uses what we both might call an old fashioned charging circuit. -- Have Fun, Brooke Clarke http://www.PRC68.com

Re: [time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)

I would not use such a narrow pulse for any of those reasons except for power if that was an issue. I would and have however used narrow pulses simply because it allows for a lower volt*time product on a transformer. On Fri, 16 Sep 2016 21:03:12 -0400, you wrote: >Hi > >It is sort of an "

Re: [time-nuts] 53132A triggering

Well I have looked into this before for the 53131A, and the way signal peak volts is implemented is bizarre. I say bizarre because for low frequency, low duty cycle signals (like PPS) the 53131A will at times report the lower peak as being higher than the upper peak... >From the 53131A Manual:

Re: [time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)

Thanks guys - interesting answers all! Peter On 17 September 2016 at 18:00, Chris Albertson wrote: > On Fri, Sep 16, 2016 at 4:44 PM, Peter Vince > wrote: > > > Can I ask why PPS pulses are so narrow? It makes them difficult to see >

Re: [time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)

On Fri, Sep 16, 2016 at 4:44 PM, Peter Vince wrote: > Can I ask why PPS pulses are so narrow? It makes them difficult to see on > a 'scope, and difficult to detect on a PC. And, as Bob said, far less > obvious if you trigger off the wrong edge. > None of us can

Re: [time-nuts] 53132A triggering

Hi Set it up on your 53132 and see what happens … Bob > On Sep 16, 2016, at 8:35 PM, Scott Stobbe wrote: > > For a low duty cycle pulse, the ac coupled signal will be approximately the > same as if it were dc coupled. Not sure I follow what you mean. There will > be

Re: [time-nuts] HP-105B Battery Replacement?

On Sat, 17 Sep 2016 12:03:47 +0200 Attila Kinali wrote: > Hence people > were adviced to use only NiCd fast-chargers which had a temperature sensor. Addendum: The other "classical" NiCd fast-charger architecture used the fast rise in temperature when the battery was full to

Re: [time-nuts] HP-105B Battery Replacement?

On Fri, 16 Sep 2016 11:37:23 -0700 Brooke Clarke wrote: > The chemistries are very different. Ni-Cad is endothermic whereas Ni-MH is > Exothermic. This is why chargers for Ni-MH > have a mandatory temperature sensor. This is one of the reasons I say Ni- > Cad cells

Re: [time-nuts] HP-105B Battery Replacement?

It has been my experience that both chemistries have thermal cutouts for overcharge limiting and both can use chargers that detect the negative voltage slope when the cells heat up once they are fully charged, hence the ability to use the same chargers for NiCd and NiMH. I have many radios