Dan,
my experience is limited to about ten HP5065A that I have had and sometimes
repaired.
It is important to know if yours has been turned off for a long time before
turning it back on again.
In these cases, it is normal for you to have a visible amplitude variability
and flickeri
Paul,
SRDs are alive and well, and fairly common. They may be pretty spendy
though, especially ones in microwave packaging. I don't know - I've
never bought a new one, since I have all kinds of oldies salvaged from
stuff over the years.
Ed
___
tim
Hi:
Diodes that store charge are very different from diodes that do not. SRD, Varactor & PIN are common diodes that store
charge. For these the key parameter is the amount of charge storage as measured by the Lifetime specification. For
optimum SRD performance you'd like the lifetime to be ab
Ed
Thanks for the clue. Well on the way with the 9.6 MHz. But I think I may
also have something in the 15.360 range.
Darn soldered things to quickly. :-)
On Mon, Aug 27, 2018 at 10:50 PM, ed breya wrote:
> I remember I have a bunch of 15.360 MHz TCXOs that were very common - I
> think they came
OK moving along.
Do have the 9.6 MHz vectron VTO all set up and working well. It outputs a 3
V clipped sine wave, cleaned up with a single 2N3904 transistor to a 74ls14
inverter. Yup going to use TTL as it turns out I did not have
correct/reasonable CMOS counters. So much for low power. Will feed a
I remember I have a bunch of 15.360 MHz TCXOs that were very common - I
think they came from some big old cell phones I junked out long ago -
you know, the kind that were bolted into the car. This is still a
standard frequency, and it would be nice for making 60 kHz by simply
diving by 256. A q
Dan
I missed the fact that you hacked a smt srd in. It was Eds post that caught
my attention. That hack is worth sharing the details with time-nuts. I
didn't even know you could get SRDs today.
Regards
Paul
WB8TSL
On Mon, Aug 27, 2018 at 8:03 PM, ed breya wrote:
> I forgot to mention:
>
> If you
Hi
60,000 / 1,000,000 = 0.06
Thus, 1 ppm at 60KHz is 0.06 Hz
Nothing magic about it.
I believe you will find that all the filters are fairly similar in minimum
bandwidth. Some
may have steeper skirts than others. You can only get just so narrow and still
pass the sidebands from the AM modulat
I forgot to mention:
If you've been diagnosing by swapping parts, be aware that changing the
A3 is the same as changing the SRD - they won't necessarily match
anymore, so would need adjustment.
Maybe your original SRD was just fine, but the whole set needed
adjustment. Who knows what may hav
The fact that your substitute replacement SRD seems to mostly work
indicates it's in the right speed class for the application. Did you try
any of the the adjustments in the driver to it? SRDs typically need a
bias adjustment and RF matching network tweaked for the particular part,
not just the
Corby would have the best answer. But this has come up before and I am
pretty sure they were HP specials.
Great that you have 2 X 5065s, wow.
I don't want to mislead you, but are the drive and the anttenuator set
correctly?
Regards
Paul
WB8TSL
On Mon, Aug 27, 2018 at 1:39 PM, Chicken Time
wrote:
Appreciate the comments.
But back to the problem at hand.
Having a replacement for wwvb that drives cheapy wall clocks and icing on
the cake allowing phase tracking clocks to decode the time.
Fix the good clocks and the cheapies work. That said not wanting to get
crazy here.
I measured the Spectra
Well tinkering around and have 20 X 13 MHz vectron TCXOs.
I have to say impressive. Ran it from 73-100 degrees. Its starts 40 Hz low
and only moves 5 Hz over the range.
Just my luck no 12 MHz units. Though I do have a number of 9.6 Mhz vectron
and div 160 gets 60 KHz.
They are actually only VTOs an
Hi
One of the “interesting” things about the phase modulation on WWVB is that it
does not get converted to
AM (and thus mess things up) in the front end filters of the typical watches
and clocks. The filters also do
not strip off the AM modulation sidebands of the signal. One would *guess* that
Tim, there is indeed a consumer clock that uses only the BPSK modulation
on WWVB. It is an "ULTRATOMIC" clock by La Crosse and has available on
Amazon for over a year now. I have two of these clocks. They are
*vastly* more sensitive than the usual "atomic" AM clocks. My actual
experience is tha
Greetings,
Long, long time reader/fan, first time writer. I have a HP5065A that I've
been messing with that has a problem which I think I've narrowed down to the
SRD. It is functional but seems to have an unusual behaviour, including
visible amplitude variability and flickering of of the 2nd
Hi
The temperature spec on a typical 60 KHz crystal is in the 100’s of ppm
range. The temperature coefficient can hit multiple ppm / C at fairly rational
temperatures. That all adds on top of the set tolerance of the crystal. Simply
to keep it passing signal while the room changes temperature wo
The consumer WWVB wall clocks use a single 60kHz crystal as a front end
filter (not as an oscillator).
Unloaded Q of a small tuning fork crystal is often 30,000 or so. (You can
actually observe this order of magnitude when a 32kHz crystal used in an
oscillator - remove power and the crystal contin
Hi
One Hertz out of a million Hertz is one part out of a million parts.
One Hertz out of 100,000 Hertz is ten parts per million.
One Hz out of 10KHz is 100 PPM.
One Hertz out of 60,000 Hertz is 16.667 parts per million.
If you are running into a device that swings it’s OCXO to lock to the inc
OK you sort of lost me here. 16 PPM would be great I might find something
that works without a power sucking oven.
But Bob mentioned online calculators and there are PPM calculators. Mr
Google seems to know all.
That said the lock range of any of the professional receivers is tight. +/-
.6 Hz. Used
In the August NED New Equipment Digest NEWEQUIPMENT.com issue on page 30 and 31
is an infomercial on the 10K Clock, is covered with some nice pictures.
Bert Kehren
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lis
Simple error. It is 1.667. 73 - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115
-Original Message-
From: time-nuts On Behalf Of Bob kb8tq
Sent: Sunday, August 26, 2018 6:34 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nut
22 matches
Mail list logo
