Re: [time-nuts] Using a common power supply among few time standards

[Chris Waldrup]

Hi Taka,

How about using the open frame linear supplies like the ones from Power One or 
Lambda?
I usually pick these up when I find them, recap if needed and they're a cheap 
and easy way to get a supply. 

Chris
KD4PBJ

> On Feb 6, 2020, at 4:29 PM, Taka Kamiya via time-nuts 
>  wrote:
> 
> I have been addicted to home brewing GPSDO, Rubidium, OCXO, and etc, etc, 
> etc.  I don't mean making of these from scratch but taking a surplus unit and 
> encase them in ready-to-use form.  Most of them are in U2 rack case.
> 
> One part of it that I really do not like is constructing a power supply for 
> each and every unit I make.  Good power supplies are essential to clean and 
> stable timebase, I know.  It is also heat generating as most of what I make 
> use linear regulators.  But it's tedious and mandane to do it every single 
> time!  So, I wanted to make a large enough power supply to provide +24V, +/- 
> 12V, and 5V.  My plan was to have independent feed line for each timebase 
> unit.
> Is this even a good idea?  I have no experience in this to make a reasonable 
> judgement.  This plan would mean these power voltages will be fed to each 
> components without any local regulation.  While I do plan to put ferrite 
> chokes and bypass capacitors at input, but since the whole point is to 
> eliminate local power supply components, there will be nothing else in terms 
> of isolation.
> Similarly, I was also thinking of having a large battery bank for 24 volt 
> supply.  What type of battery is irrelevant and so as charging method for 
> this question.  I have heard of this being done.  But for units that require 
> 24 volts, that means there is no room for any type of regulation.  Most 24V 
> batteries output varying voltage depending on state of charging.  I know 12V 
> battery can produce as high as 13.x volt.  Is anyone doing this type of thing 
> on this list?  If so, would you be willing to share details?
> 
> Appreciate any input.
> 
> --- 
> (Mr.) Taka Kamiya
> KB4EMF / ex JF2DKG
> ___
> 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] Bob Roehrig K9EUI SK

[Chris Waldrup]

Bob and I corresponded about this project probably 12-15 years ago and he sent 
me a printed copy of the article with updates which I still have.  
He was a really nice guy, even offered to have me send him the preamp section 
which did not work well and he concluded that the Toko bobbin I wound one of 
the slug tuned transformers on was not the correct mix. The original part 
called for was long out of production by that time and I had to substitute. 

Chris
KD4PBJ

> On Jan 4, 2020, at 1:37 AM, Donald E. Pauly  wrote:
> 
> I am working on a readible copy.  This isnthe best that I can do for now
> from January 73 of 1994.
> 
> https://archive.org/details/73-magazine-1994-01/page/n11
> 
>> On Thursday, January 2, 2020, kc9ieq via time-nuts 
>> wrote:
>> 
>> Services for our fallen fellow time nut Bob Roehrig are this Saturday
>> January 4, in Batavia, IL.  Bob was a member of this list, and many of you
>> may remember him from articles and projects published in 73 Magazine (and
>> others) such as 1994's "Using the World's Most Accurate Frequency Standard"
>> which in great detail he walked through building a WWVB
>> receiver/comparator.  He was a brilliant builder and hardly owned a single
>> piece of amateur radio equipment that he didn't build from scratch, or
>> modify.  http://www.mossfuneral.com/obituaries/details/2589/Regards,Chris
>> FarleySent via wireless apparatus _._
>> ___
>> 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] Programmable clock for BFO use....noise

[Chris Waldrup]

How about using a ProgRock on Hans Summers QRP Labs website? This is a 
programmable crystal replacement. 

Chris
KD4PBJ

> On Sep 14, 2018, at 8:06 PM, paul swed  wrote:
> 
> The beauty of a $2 arduino and a drop of code snitched from Engineer google.
> OK enough of that back to the thread.
> Regards
> Paul
> WB8TSL
> 
>> On Fri, Sep 14, 2018 at 8:04 PM, Mike Feher  wrote:
>> 
>> Not when I built them in the late 60's and early 70's. All discrete. 73 -
>> Mike
>> 
>> 
>> 
>> Mike B. Feher, N4FS
>> 
>> 89 Arnold Blvd.
>> 
>> Howell NJ 07731
>> 
>> 848-245-9115
>> 
>> 
>> 
>> -Original Message-
>> From: time-nuts  On Behalf Of Richard
>> (Rick) Karlquist
>> Sent: Friday, September 14, 2018 7:15 PM
>> To: Discussion of precise time and frequency measurement
>> ; ed breya 
>> Subject: Re: [time-nuts] Programmable clock for BFO usenoise
>> 
>> 
>> 
>> 
>>> Finally, of course, you can use DDS. This is nearly an ideal case for
>> 
>> 
>> 
>> The trouble with a DDS is that you need a microcontroller with software
>> just
>> to baby sit the thing.
>> 
>> 
>> 
>> Rick N6RK
>> 
>> 
>> 
>> ___
>> 
>> 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] PLL/GPSDO/etc learning resources for mere mortals

[Chris Waldrup]

I was able to save it to iBooks on my phone and can print from that. 

Chris
KD4PBJ

> On Sep 3, 2018, at 9:52 AM, jimlux  wrote:
> 
> On 9/3/18 5:52 AM, Richard (Rick) Karlquist wrote:
>>> Also worth checking out "Dean's book":
>>> 
>>> http://www.ti.com/tool/PLL_BOOK
>>> 
>>> This makes a great introductory text/prerequisite for the heavy hitters like
>>> Gardner and Rohde.  Dean Banerjee spent many years providing customer
 
>>> -- john, KE5FX
>> You hit a home run ... this is a great tutorial.  This reminds me
>> of the saying "equations don't teach.".  I love the graph on
>> page 1 that has "VCO" and "everything but the VCO" marked.
>> Yet another reason to keep reading time-nuts.
> 
> 
> Dean's book is great.  Can you print from the pdf? Back in version 3 or so, 
> it was one of those "can't print" pdf files (which I'm sure could be broken 
> by a non Adobe reader).
> 
> So I bought a printed copy - worth every penny of the $15.
> 
> It's the book I hand out to people when they start asking about how to do a 
> PLL circuit.  "Here, this book is sort of like the master application 
> note...Read it and start finding out what went wrong."
> 
> 
> ___
> 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.