Hi Joe,
Using dropbox is a good idea. Thanks for posting those interesting QST pages.
About the bloat -- a MIME base64 encoding is 6-bits / 8-bits = 75% efficient.
Each line is 76 characters plus 1 or 2 overhead (CR+LF) so it drops to 73.077%.
That means the ascii email is 1.368 times larger than
Tom,
Thanks, but I already reposted with links to that PDF and a followup. Feel
free to post a permanent copy of both. I will delete the linked files on my
end at some point.
Joe Gray
W5JG
On Fri, Jun 21, 2013 at 10:05 PM, Tom Van Baak wrote:
> Hi Joe,
>
> That PDF attachment was 3.4 MB (too
Joe,
As was mentioned earlier, U.S. AM broadcast tolerance is +/- 20
Hz. Many of the LPB low power transmitter were used for TIS/HAR
service. The tolerance for that service is +/- 100 Hz. I've
maintained several of these stations, including the 100 watt system
on 530 kHz at LAX Airport. T
Paul,
This is probably why they sell crystals cut for 60,002 kHz and 60,005
kHz. I ordered 10 of the 60,000 kHz crystals from DigiKey for about
a buck each. The 60,002 and 60,005 crystals were only available in
lots of a bazillion. It sounds like when I build the oscillator
portion of the
That PDF shows 2.4 MB on this end. I guess the MIME encoding really bloats
it.
Joe
On Fri, Jun 21, 2013 at 10:50 PM, Joseph Gray wrote:
> Tom,
>
> Thanks, but I already reposted with links to that PDF and a followup. Feel
> free to post a permanent copy of both. I will delete the linked files
More goodies from QST. Attached is an article about the very first ARRL
Frequency Measuring Test.
At just over 2 MB, that attachment was too big for the list. Find it here
for a short while:
https://dl.dropboxusercontent.com/u/19599147/QST%20Sep%201931%20-%20FMT.pdf
And while I'm at it, here are
Hi Joe,
That PDF attachment was 3.4 MB (too large for the list) so I put a copy here:
www.leapsecond.com/tmp/1931-Sep-QST-FMT.pdf
/tvb
- Original Message -
From: Joseph Gray
To: Discussion of precise time and frequency measurement
Sent: Friday, June 21, 2013 7:26 PM
Subject: The f
Hey, it could take the place of WWVB. Put it on 600 kHz. Then all you need
is a simple divide by 10.
TIC,
Tom
- Original Message -
From: "Magnus Danielson"
To:
Sent: Friday, June 21, 2013 11:04 PM
Subject: Re: [time-nuts] Oscillator temperature compensation
On 06/22/2013 03:29
I found an old post that indicated that it is a relabeled Vectron OC-050. Can
anyone verify that? I've gotten most of the parts for my VE2ZAZ GPSDO, and am
now trying to lay out how it's all going into the HP 37203A box.
Bob - AE6RV
___
time-nuts m
On 06/22/2013 03:29 AM, Joseph Gray wrote:
Otherwise you might just as well lock it up instead.
Hmm, a 1970 vintage tube transmitter with a GPSDO frequency lock :-)
We are time-nuts, arn't we? :-)
Cheers,
Magnus
___
time-nuts mailing list -- time-n
These are not the greatest transmitters high school radio station had something
similar.You might try creating a rudimentary oven for crystal use a
bimetallic switch if you want authentic otherwise transistor circuit to control
heater
Did something similar with my Swan 250 years ago. It w
Hello to the group
Very good thread. I am recovering from a severe flu. Thats wgy I have not
been around.
This will be brief.
1Hz off seems to cause an issue.
The 60 khz xtals from mouser all seem to always be low.
So by lowering the drive and I assume loading. The 20K resistor they come
into range
These are so small no chance in heck to grind them
On Fri, Jun 21, 2013 at 1:00 PM, Tom Knox wrote:
> I hope no one minds if I take a moment to reflect.
> Crystals are a great example of what can be accomplished today in physics
> and how far we still have to go. Crystals are still really is as
In my opinion you are expecting more of the transmitter than it was designed
to give. A carrier current transmitter wouldn't have to maintain the
broadcast standard of plus or minus 20 Hz. A drift of 200 Hz would never
have been noticed on an all American five radio. Given a strong received
Magnus I certainly can and did in my earlier release some 6 months ago. But
thats very specific to one rcvr type. This is a general approach that keeps
you out of the insides.
Recovering from a severe flu
End for tonight.
On Wed, Jun 19, 2013 at 4:22 PM, Magnus Danielson <
mag...@rubidium.dyndns.
>Otherwise you might just as well lock it up instead.
Hmm, a 1970 vintage tube transmitter with a GPSDO frequency lock :-)
Thanks to everyone for the suggestions. I will spend more time with this
rig and see what works.
Joe Gray
W5JG
___
time-nuts mail
On 06/21/2013 06:59 AM, Joseph Gray wrote:
Can you show some pictures of the oscillator?
The wiring is point-to-point, so I don't think a picture is going to tell
you much.
Is there a tunable inductor in the oscillator circuit?
As I mentioned, nothing tunable there.
Who makes the unit?
I hope no one minds if I take a moment to reflect.
Crystals are a great example of what can be accomplished today in physics and
how far we still have to go. Crystals are still really is as much art as
science. I think that is what draws me to draw of Time and Freq, one day you
can be taking me
I used to produce ultrasound transducers using a very similar method. I'd
continuously monitor the resonant frequency with a network analyzer as I'd
lay down gold/silver/whatever with an evaporator cup from both sides. My
chamber has a shutter to cover the transducers (I think it has 12 or 15
st
"Drift quite a bit" is a matter of what century you are in.
Don't forget in this era, fine calibration marks on most receivers were
5 KC, if you were lucky. They would drift only 20 KHz/hour, if you were
lucky. Receiver bandwidths were 10 KC. Drifting 1 KC on AM transmit
would hardly be not
On 06/21/2013 02:58 PM, Bob Camp wrote:
Hi
Most precision crystals get a high vac bake out prior to seal. It works to
drive off some stuff. There's a practical limit to how hot you can get and how
long you can afford to pump for. Not quite everything gets removed….
Indeed. It is also not the
Charles, you obviously are familiar with this transmitter. You don't happen
to know where I can get a schematic, do you?
Joe
On Fri, Jun 21, 2013 at 5:07 AM, Charles P. Steinmetz <
charles_steinm...@lavabit.com> wrote:
> Joe wrote:
>
> I have an old AM transmitter that has three 6AL11 compactr
Hi
Most precision crystals get a high vac bake out prior to seal. It works to
drive off some stuff. There's a practical limit to how hot you can get and how
long you can afford to pump for. Not quite everything gets removed….
Bob
On Jun 21, 2013, at 6:04 AM, Magnus Danielson
wrote:
> On 06/
Hi
At that frequency, the crystal is likely some sort of bar cut rather than an
AT. If the transmitter has no oven / heater around the crystal, it will indeed
drift quite a bit.
Bob
On Jun 21, 2013, at 12:09 AM, Joseph Gray wrote:
> This is not strictly Time Nuts, but it is about a crystal o
Hi
For a period of time, the USAAF was essentially shut down due to people
grinding crystals and not etching them afterwords. The particles you inevitably
leave behind are the issue. Etch is the only practical cure. It's also a quite
effective way to move the crystal frequency small amounts. Th
On 06/21/2013 06:11 AM, Jim Lux wrote:
On 6/20/13 4:57 PM, Gary wrote:
A common scheme in metal deposition measurement is to measure the
frequency of a crystal prior to starting the deposition process, then
monitoring the frequency shift of the crystal as the metal is sputtered.
I was told crys
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