What this needs is some enterprising
chap to make 3D boxes to hold these.
Much like the ones that were being sold
to hold a Nano VNA.
73, Dick, W1KSZ
On Thu, Apr 23, 2020 at 7:12 PM Didier Juges wrote:
> The new Thunderbolt monitor kits are available.
> This one has a 32 bit ARM microcontrolle
Hi Perry --
The circuit in the FatPPS is really simple and would be easy to duplicate.
Frankly, the reason we had to significantly increase the cost is because
we provide the board fully assembled (it's all surface mount parts), and
with the low volume we've had in the last few years, the per-uni
On Fri, Apr 24, 2020 at 7:20 PM Perry Sandeen via time-nuts <
time-nuts@lists.febo.com> wrote:
>
> But for us *Po Folks* hobbyist we have to stick with older but larger
> parts.
> Now if there was a service where you could order the part soldered to a
> breakout board with .1 inch breakout pins fo
Learned Gentlemen,
Several poster wrote:
TAPR offers a FatPPS kit to stretch the pulse out, and it looks likethey're
back in stock. I have one but haven't assembled it
yet.https://tapr.org/product/fatpps-pulse-stretcher/
OK no problemo. But it's $55. It's probably a great device, but does this
> Is this a reasonable setup for an affordable NTP server?
How/where are you going to connect up the OCXO?
> I want to build an affordable quality time source for my computer club.
Assuming "time source" means NTP server, the CPU is where you want to connect
up a good clock. You will probably
Hi
A GPSDO would be the “next step” if you want to continue on when GPS
is not present. They are a < $100 sort of thing from a number of sources.
Bob
> On Apr 24, 2020, at 4:38 PM, Andreas Kempe wrote:
>
> On Fri, Apr 24, 2020 at 04:22:46PM -0400, Bob kb8tq wrote:
>>
>> Hi
>>
>
> Hello Bob,
On Fri, Apr 24, 2020 at 04:22:46PM -0400, Bob kb8tq wrote:
>
> Hi
>
Hello Bob,
> Assuming you can get a good sky view for the GPS / GNSS device, that’s about
> all you need. Feed it into whatever computer you decide to use and move on.
> The
> OCXO is simply a power hungry “non contributor” in
I use Garmin 18 for this purpose. It's like 80 dollars and it's smaller than a
hockey puck. It includes GPS, antenna, and RS232 like interface. You MUST get
LVD version. USB version and PC version does not have 1 second PPS output.
It's quite sensitive. It's magnetic, so I stuck it on top
Hi
Assuming you can get a good sky view for the GPS / GNSS device, that’s about
all you need. Feed it into whatever computer you decide to use and move on. The
OCXO is simply a power hungry “non contributor” in this case.
Bob
> On Apr 24, 2020, at 2:46 PM, Andreas Kempe wrote:
>
> Hello every
Hi
> On Apr 24, 2020, at 3:52 PM, Wes wrote:
>
> Hi Bob,
>
> Honestly, I don't have any particular holdover requirements in mind, just
> that it has some :-) This is just one of those nutty things. You must
> understand.
>
> Wes N7WS
Ok, so what does the current setup do that you are n
Hello everyone,
I want to build an affordable quality time source for my computer
club. I've been toying with the idea of using an oven controlled
oscillator from Ebay for getting a reasonable (0,5 ppm frequency
stability) 1 PPS signal and a cheap GSP chip with UART for syncing the
time. I was thi
Hi Bob,
Honestly, I don't have any particular holdover requirements in mind, just that
it has some :-) This is just one of those nutty things. You must understand.
Wes N7WS
On 4/24/2020 10:14 AM, Bob kb8tq wrote:
Hi
On Apr 24, 2020, at 12:56 PM, Wes wrote:
No, I'm not looking for adv
Taking some of the advice offered, I've emailed them for P&A. I'll let you know
if I hear back.
Wes
On 4/24/2020 10:45 AM, Kevin Rowett wrote:
On Apr 24, 2020, at 10:32 AM, Mark Spencer wrote:
Speaking both as an amateur radio operator and some one who modestly pursues
precision time and f
> On Apr 24, 2020, at 10:32 AM, Mark Spencer wrote:
>
> Speaking both as an amateur radio operator and some one who modestly pursues
> precision time and frequency as a hobby, I am extremely happy with my Jackson
> Labs Fury
> GPSDO.
Speaking of Jackson Labs, has anyone heard from them, sin
Hi
Based on a 30 db carrier to noise floor at the sat:
Going from -120 dbc/Hz to -60 dbc/Hz will have << 0.1 db impact.
Going from -60 dbc / Hz to -30 dbc/Hz would be in the 3 db range.
Simply put, the signal is way down in the noise by the time it gets to the
sat. There is very little gain fr
Bill,
Thanks a lot for the application link - really interesting and useful.
I will try to understand how it is possible to take into account the effect
of the phase noise level on the link budget.
Thanks.
Karen, ra3apw
>
>
> Hi again Karen,
> Have you seen this app designed specifically for th
Hi Bob,
Your calculation is close to real with QO-100.
With ERP = +55 dBm we have about 30 dB S/N on RX side.
If so when we changing the TX LO's PN level from 120 dBc/Hz to 90 dBc/Hz we
lose only 3 dB in terms of RX S/N?
Not sure if you can even notice ...
Karen, ra3apw
>
> Hi
>
> Assuming
Speaking both as an amateur radio operator and some one who modestly pursues
precision time and frequency as a hobby, I am extremely happy with my Jackson
Labs Fury
GPSDO.
I have also found my G3RUH GPSDO to be well suited for my amateur radio use
(and it has also been interesting from a time a
Hi
> On Apr 24, 2020, at 12:56 PM, Wes wrote:
>
> No, I'm not looking for advice on how to build one but what I might buy. My
> need is strictly hobbyist (ham radio). I currently have a Bodnar dual
> frequency unit, that gives me frequency and a TAPR, (Synergy Systems) that
> gives me 1 pps
My first recommendation will be a Thunderbolt. It's not the least expensive
and it is not the best performing. But the benefit of going with T-bolt is
plenty of accessories (display board, etc) and wealth of information including
how-to are available. It is also supported by virtually all sha
No, I'm not looking for advice on how to build one but what I might buy. My
need is strictly hobbyist (ham radio). I currently have a Bodnar dual frequency
unit, that gives me frequency and a TAPR, (Synergy Systems) that gives me 1 pps,
but I would like something that gives me both, with bette
Hi
Assuming you know the power level you will be delivering to the sat and the
noise figure of the
receiver on the sat, the calculation is just as presented earlier. If the
antenna on the sat has gain,
that also gets into this and that.
Using some made up numbers, since I do not have the real
Hi again Karen,
Have you seen this app designed specifically for the Es'hail QO-100?
https://play.google.com/store/apps/details?id=com.antmodstudios.eshail2linkbudget&hl=nl
Any extra margin on C/N0 can be used to estimate permissible LO phase noise.
Otherwise, you can put together a link budget
Hello Bill,
Thank you for the clarification. It is especially pleasant that our opinions
are 100% the same.
However, I would like to find some tool for calculating the balance of the
radio link in order to understand exactly the reasonable requirements for
synthesizer's PN.
The issue of stab
On Fri, Apr 24, 2020 at 8:08 AM jimlux wrote:
> On 4/24/20 5:52 AM, David J Taylor via time-nuts wrote:
> > Hi
> >
> > The “wiggles” he is chasing are about 2-3 Hz (by eyeball on his charts).
> > At 2.4 GHz,
> > that is a fairly convenient ~1 ppb. The Z-3801 (if it was in good
> > health) should
On 4/24/20 5:52 AM, David J Taylor via time-nuts wrote:
Hi
The “wiggles” he is chasing are about 2-3 Hz (by eyeball on his charts).
At 2.4 GHz,
that is a fairly convenient ~1 ppb. The Z-3801 (if it was in good
health) should be easily
able to hold that level of performance. It’s not clear whic
Hi
The “wiggles” he is chasing are about 2-3 Hz (by eyeball on his charts). At
2.4 GHz,
that is a fairly convenient ~1 ppb. The Z-3801 (if it was in good health)
should be easily
able to hold that level of performance. It’s not clear which MD-011 he is
using, but it is
a pretty good bet it wil
Hi
The “wiggles” he is chasing are about 2-3 Hz (by eyeball on his charts). At 2.4
GHz,
that is a fairly convenient ~1 ppb. The Z-3801 (if it was in good health)
should be easily
able to hold that level of performance. It’s not clear which MD-011 he is
using, but it is
a pretty good bet it wil
Hello Karen,
As a general rule of thumb, if uplink LO phase noise power ends up being
at least 15-20dB below the expected kTB noise received at the satellite
transponder, its contribution is not really significant. With -98dBc-Hz,
on Tx, you should be in good shape because, to simplify things a
From: Karen Tadevosyan via time-nuts
Hi,
one of the interesting HAM radio topic in Europe now is the use of the new
geostationary satellite Phase-4A (QO-100) for analog and digital modes via a
2.4/10 GHz transponder.
[]
===
... and Time-Nuts may be interested
Hi,
one of the interesting HAM radio topic in Europe now is the use of the new
geostationary satellite Phase-4A (QO-100) for analog and digital modes via a
2.4/10 GHz transponder.
For my transverter (input from a UHF transceiver) in TX mode I use a 1968
MHz LO with a phase noise level -98 d
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