How good does the sine wave need to be? The usual method is to use a
low-pass filter A CLC "pi" filter works.
On Thu, Jul 16, 2015 at 10:49 AM, skipp Isaham via time-nuts
wrote:
> re: 10MHz Square to Sine Wave Conversion
>
> The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like
All you need is a 10 MHz low pass filter.
How far down do you need the harmonics/spurious to be?
If 40 dB suppression of the 2nd and 3rd harmonics is adequate,
(you can't see the distortion with the eye on an oscilloscope)
you can make your own for about $2 in parts, not including a PC board or
h
Hi
The simple approach is to buffer it with a few ‘125 buffers in parallel. Then
convert
to sine wave with a T-network matching section. There are a lot of matching
calculators
on the web. Something in the 50 to 200 ohm input range and 50 ohm output is a
reasonable
way to go. More gates and hig
Here's the URL to the document I was referring to:
http://www.w1ghz.org/small_proj/10MHz_Filter_for_GPS_Reference.zip
And I see in my simulation I have the inductor and cap in the center of the
schematic reversed, however it was built properly.
-Bob
On Thu, Jul 16, 2015 at 3:24 PM, Bob Darlingt
Hi,
What distortion level would you like to achieve?
Regards,
Vasco Soares
Em 2015-07-16 18:49, skipp Isaham via time-nuts escreveu:
re: 10MHz Square to Sine Wave Conversion
The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like
to convert it to a sine wave and I am looking for
For the life of me I can't find the link to the schematic or any mention of
it in the archives. Google fail. However, I was able to find some screen
shots and pictures from the Chebyshev filter that I built from the docs
that I originally found here. This should get you started if you want to
r
You can't use the square wave? You could put in a resonant circuit that will
select the fundamental but other issues arise, such as phase noise and harmonic
content. How much harmonic content can you tolerate?
There is a host of ways to do this job but much depends on your requirements.
Bob K6DD
I'm not sure what happened to all of the spares, but I do know
that the spare bird was assembled, coddled, polished, and hung
from the ceiling of the Udvar Hazy Air and Space Museum in
Chantilly, Virginia. I think everything is there except for
the RPG, and Tombaugh's ashes. I'm pretty sure it e
I want to change the UART1 port speed on my LEA-6T via message string from my
GPSDO board. I had assumed that I would have to discover (or know) the baud
rate already set on the LEA-6T in order to change it. But it appears that the
LEA-6T can receive messages at any baud rate, but you need to
Hi
Quick and simple:
1) Signal power is proportional to the area of the loop. Bigger is better.
2) Inductance is proportional to the turns squared. Turns do not directly
affect signal to noise.
3) Inductance may be resonated with a capacitor. This gives a bandpass function.
4) The coil shapes a
Hi
There are some amazing things you can afford to do when you are targeting a <
20 pcs / year market and have
dozens of people to work on the product.
Bob
> On Jul 16, 2015, at 3:24 PM, Brian, WA1ZMS wrote:
>
> The crystal in the ref osv. came from Bliley. The part number is BG-61. I
> ha
Hi Magnus,
The 2E21 is a 2.21 Ohms resistor.
The RC network was found useful to ensure loading at higher frequencies.
Best regards
Ole
Den 16-07-2015 kl. 18:27 skrev Magnus Danielson:
Ole,
What is the value of the "2E21" resistor?
Looks like a typo. 2k?
Feel inspired to rig up something for m
The Dymec 100 active antenna systems are also a good choice and don't require a
DC block between the Austron and antennas As they are split into an indoor
and outdoor unit
Content by Scott
Typos by Siri
> On Jul 16, 2015, at 9:09 AM, paul swed wrote:
>
> Dan
> I have several 2100s and 2100F
The crystal in the ref osv. came from Bliley. The part number is BG-61. I have
no idea what the current cost is, but like most very good oscillators the
crystals were hand sorted and graded.
-Brian, WA1ZMS
iPhone
> On Jul 16, 2015, at 11:17 AM, "John Stuart" wrote:
>
> Here is an interesting
The link below is an updated version of the same paper:
http://www.boulder.swri.edu/~tcase/NH%20RF%20Telecom%20Sys%20ID1369%20FINAL_Deboy.pdf
It has considerably more detail on the RF components as well as the
USO module for which there is an entire page of additional information
and a block diag
On 7/16/15 8:17 AM, John Stuart wrote:
Here is an interesting link to the New Horizons Mission to Pluto radio
system design.
Note last section describes an OCXO with ADEV = 1E-13 at 1s, and aging rate
of <1E-11 per day.
That's no ordinary OCXO. That's a USO made at APL. The crystal is in a
s
re: 10MHz Square to Sine Wave Conversion
The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like
to convert it to a sine wave and I am looking for suggestions and info re
any reasonable pre-made circuits and/or boards. No sense reinventing the
wheel if I can avoid it.
Otherwise
Ole,
What is the value of the "2E21" resistor?
Looks like a typo. 2k?
Feel inspired to rig up something for my FS700.
Will wooden frame my TP-cable wired to form a 8 turns times the cable-turns.
Cheers,
Magnus
On 07/16/2015 09:05 AM, Ole Stender Nielsen wrote:
I use a home-made untuned loop
In message
, "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
>but roughly how many turns were there on the coil?
Probably too many, all things considered, but I have *no* idea.
>Do you have a circuit for the amplifier?
It was based on/inspired by a schematic I found on vlf.it
>I mu
> Le 16 juil. 2015 à 12:52, Blair Lade a écrit :
>
> Hi All,
>
> I've just joined time nuts so go easy on me!
>
>
>
> An interesting 'moment' in time was had during the leap second!
>
> The Symmetricon 2100 I have is fitted with the modified Heol GPS.
>
> According to the video I took of t
In message <55a757d3.9050...@mail.tele.dk>, Ole Stender Nielsen writes:
>I use a home-made untuned loop antenna [...]
A note about Loran-C and loop-antennas:
The loop-antennas are sensitive to magnetic fields and therefore
sensitive to direction.
Depending on side of the loop you point
Here is an interesting link to the New Horizons Mission to Pluto radio
system design.
Note last section describes an OCXO with ADEV = 1E-13 at 1s, and aging rate
of <1E-11 per day.
http://www.uhf-satcom.com/amateurdsn/Paper-969.pdf
I wonder if their spares will show up on eBay?
John Stua
After this launch -- the U.S. will decommission (retire) one the remaining II-A
(Rockwell/Collins) GPS satellites launched in 1990s. According to my reference
-- only 3 of those II-A birds are still active or in backup status.
I would expect those 3 birds to be decommissioned by 2017.
g. beat
ZOn 15 Jul 2015 22:18, "Poul-Henning Kamp" wrote:
>
>
> David Kirkby - Kirkby
> Microwave Ltd " writes:
>
> >What's the best sort of antenna for these?
>
> I use a $20 loop antenna I have rigged up myself, it lives in my attic:
>
> http://phk.freebsd.dk/loran-c/Antenna/
Hi,
Tha
Dan
I have several 2100s and 2100Fs and they are a really good unit. Feed in
your local reference and it will tell you the offset from the loran
station. The loran signal typically uses 3 CS references. Certainly
distance and propagation enter into the picture as far as accuracy goes.
But as an alt
Hi
I think the WWVB PM stuff is relevant to Loran in the US. We have (pretty much)
the most
involved group of “customers” for that signal here on the list. As far as I
have seen, the only
project that has gone past the talk stage is the converter to drive the old(er)
WWVB gear.
Even with our l
Hi All,
I've just joined time nuts so go easy on me!
An interesting 'moment' in time was had during the leap second!
The Symmetricon 2100 I have is fitted with the modified Heol GPS.
According to the video I took of the front LCD displays, it repeated the
first second,
ie
58,59,00,01,01,0
Hi,
I just got a used/refurbished E4437B which I wanted to use as a
all-purpose RF generator primarily for 3-4 GHz.
Unfortunately, I'm seeing strange spurs for frequencies above 2.4 GHz,
see the green curve in the attached image.
The yellow curve is an SMIQ03 for comparison.
Observations:
- Fo
In message <07538A701D6E4F8D804BD567DD794693@gnat>, "Alan Melia" writes:
I mean that a Loran-C signal designed as I proposed in a previous
email would not do that, because it wouldn't have the groups and
GRI-peridodicties which cause the splatter up and down the band.
>It just depends wh
Paul, thanks for that info. Very interesting. I've been enjoying all of the
Loran talk on the mailing list recently.
I just picked up a NOS 2100F on eBay to play around with. Maybe I'll be able to
do something useful with it one day if they continue with eLoran tests.
Dan
> On Jul 15, 2015, at
30 matches
Mail list logo
