Pual,I was just about to delete your post when I realized I had wanted to
mention Vectron.Besides the Piezo engr, our club has a Vectron egnr, who
incidentally is responsible for my becoming a ham. Both are now retired. I also
worked at Vectron just for something to do after retiring.73Sent from my
Samsung Galaxy smartphone.
-------- Original message --------From: [email protected] Date:
7/23/20 12:00 (GMT-05:00) To: [email protected] Subject: time-nuts
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1. "Best Practices" for cascading L1 GPS Antenna Distribution Amplifiers
(JAMES ROBBINS) 2. Re: WWVB PM Time Questions (paul
swed)----------------------------------------------------------------------Message:
1Date: Thu, 23 Jul 2020 09:34:11 -0400From: JAMES ROBBINS
<[email protected]>To: [email protected]: [time-nuts] "Best
Practices" for cascading L1 GPS Antenna Distribution AmplifiersMessage-ID:
<[email protected]>Content-Type: text/plain;
charset=utf-8I am wondering if anyone either knows (or can point me to
some pertinent information regarding) the "best practices" for feeding L1 to
two HP/Symmetricom 58517A (8 port) Distribution Amplifiers?1. Can I simply
choose one of the first amplifier?s ports and use that to feed the L1 RF to the
input of the second unit?2. What about the DC needs of the second amplifier?3.
Or, should I use, say, a 58512A (2 port) unit and distribute its? 2 outputs,
one to each of the inputs of the two 58517A units?4. Or, perhaps it doesn?t
really matter, as the 58512A outputs are ultimately the same thing as using one
of the first 58517A outputs to feed the second 58517A?Thoughts appreciated.Jim
RobbinsN1JR------------------------------Message: 2Date: Thu, 23 Jul 2020
10:22:22 -0400From: paul swed <[email protected]>To: Discussion of precise
time and frequency measurement <[email protected]>Subject: Re:
[time-nuts] WWVB PM Time QuestionsMessage-ID:
<cad2jfagruyryapafbabkcejgfpdvhhvm2yog+_n94wp7xk9...@mail.gmail.com>Content-Type:
text/plain; charset="UTF-8"BobI attempted to use a OCXO a Piezo and could
never get it to hold lock.Did invert the control and such. Anyhow, just
wondering if I need a simplersloppy VCTXO.No time to tinker. But I believe I
have some really nice little 10 MHzvectron VCTCXOs.If that worked then what I
am dealing with is an efc range control issue.Perhaps the swing is to
large...RegardsPaulWB8TSLOn Thu, Jul 23, 2020 at 8:58 AM Bob kb8tq
<[email protected]> wrote:> Hi>> 10 MHz *is* a frequency at which you can find a
pretty good $3 to $6 OCXO.> I find that a bit amazing, but (at least right now)
that?s how it seems to> work.> (and yes, they do have EFC).>> Bob>>> > On Jul
22, 2020, at 10:09 PM, paul swed <[email protected]> wrote:> >> > Looked at
the KD2BD schematic and it is a 10 MHz VCTCXO. That seems> > reasonable perhaps
to find.> > Regards> > Paul> >> > On Wed, Jul 22, 2020 at 6:44 PM paul swed
<[email protected]> wrote:> >> >> I was actually thinking about this quite a
bit and perhaps I went the> >> wrong way.> >> That is a cheap vcxo class
device. His unit was not an oven as I recall.> >> Just maybe a bit too good was
actually bad.> >> Hard to say and no time to play right now.> >> Regards> >>
Paul> >> WB8TSL> >>> >> On Wed, Jul 22, 2020 at 6:06 PM Bob kb8tq
<[email protected]> wrote:> >>> >>> Hi> >>>> >>>> >>>> >>>> On Jul 22, 2020, at
3:51 PM, paul swed <[email protected]> wrote:> >>>>> >>>> Ray watch out for
my comment on the KD2BD solution. That oscillator> >>> isn't> >>>> available
and I have not been able to map something else into it.> Tried> >>>> several
good grade Oven oscillators. Just be aware of that issue.> >>>> Would need to
do more tinkering and simply don't have that time right> >>> now.> >>>> Also it
would be great if the oscillator was something that could be> >>>> obtained at
a reasonable cost. I do not believe at all it has to be a> >>>> OCXO as the
older true time and spectracoms were not and they locked> >>> solid.> >>>> So
its a case of getting the control voltages right.> >>>> >>> You can buy a
surprisingly good little OCXO (for the price) on eBay> these> >>> days in the
$3 to $6 range. Find one at 12.6 MHz and it will divide> >>> nicely to> >>> 60
KHz. 19.2 MHz looks like a better candidate ? Either way I have not> >>> (yet)>
>>> seen a 60 KHz multiple show up in the cheap category.> >>>> >>> Bob> >>>>
>>>> >>>> Regards> >>>> Paul.> >>>>> >>>> On Wed, Jul 22, 2020 at 3:29 PM
<[email protected]> wrote:> >>>>> >>>>> Thanks to all for the
suggestions. I dug a ferrite rod AM radio> antenna> >>>>> out of the box this
morning. I have a box of 10 left over from the> late> >>>>> 80s. It measures
0.950 mH so I will add some turns to get it to 1.5> mH> >>>>> which will be
easier to resonate at 60 kHz. Then I need to build up> the> >>>>> RF amp and
run the output through a 60 kHz crystal filter. I have to> >>>>> order the
crystals since I don't have any on hand. It will take a> >>> couple> >>>>> of
weeks to get the front end working.> >>>>>> >>>>> I am in Phoenix so the WWVB
signal is of decent quality here even> >>> during> >>>>> the daytime. My 25
year old cheap Casio watch will sync up within 2-3> >>>>> minutes any time of
day or night. It normally syncs at 2 am but I> have> >>>>> done tests to
confirm daytime sync works reliably.> >>>>>> >>>>> Mark, I know virtually
nothing about SDR other than it works. I> bought> >>> a> >>>>> RTL-SDR.Com
module a couple of years ago and played with it a little> >>>>> bit. But it
quit working and I haven't thought about SDR since then.> My> >>>>> Icom 7300
is a SDR and it works very well. I think to attempt to> design> >>>>> a SDR
would be well over my head. I anticipate this project taking> 2-3> >>>>>
months. If I get it working I will be glad to share everything with> the> >>>>>
group.> >>>>>> >>>>> Lester and Paul, I will test with the Costas loop as it
may be the> >>>>> easiest way to go. To test the Costas loop I am basically
going to> >>>>> duplicate the KD2BD design. I was reluctant about it in the
beginning> >>>>> but more reading seems to indicate it will be fine. My AWG
allows me> to> >>>>> set the phase from 0 to 360 degrees independently on each
channel so> I> >>>>> can use that for initial testing. That testing can be done
prior to> >>>>> getting the front end working.> >>>>>> >>>>> Richard, is your
software posted somewhere? I assume it allows you to> >>>>> specify the time
and date you want it to send. That would come in> handy> >>>>> for writing the
code to extract the timer/date data. I have seen> >>>>> examples of the Arduino
transmitting the old AM signal but don't> recall> >>>>> seeing one that sends
the BPSK stream.> >>>>>> >>>>> I have a GPS time receiver with a 1.2 inch LED
display that I built a> >>>>> couple of years ago. I have it setup so the UART
outputs the gprmc> NEMA> >>>>> string in case I want to look at it. I have a
couple of spare GPS> >>>>> modules lying around and several Arduino Uno
modules. I have no> problem> >>>>> picking up the GPS satellites using only the
patch antenna that is> >>> built> >>>>> into the modules.> >>>>>> >>>>> Ray,>
>>>>> AB7HE> >>>>>> >>>>>> >>>>>
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