I used one of the Jupiter GPS receivers that has a 10 KHz output to control my
10 GHz LO to discipline one of the common "brick" type of microwave
oscillators. These oscillators have an internal crystal oscillator (106.6 MHz
for a 10.224 GHz LO) that is multiplied up to the needed microwave fr
It has been done. One I recall is Louis Cupido's Reflock system. TAPR did a
kit for it some years back. Fairly sure there are others.
But there are a number of readily available 'systems' these days that take
a 10 MHz reference input and generate a 'clean' low microwave reference
frequency outp
Chris Albertson (and Bob Camp ):
> Why to people always build 10MHz GPSDOs?
Because "a lot" (...) of amateur radio microwave equipment is designed
off the shelf to accept an external 10 MHz input. [And other kinds of
equipment, too.] If you're not designing from the ground-up, then it makes
a lot
If it is any help, the 836XXA/B series are all capable of 1Hz resolution but
are locked at 1KHz unless you enter the license key for option 008. So it could
be software/firmware related.
Happy Merry;
Thomas Knox
From: time-nuts on behalf of Dr. David Kirkby
Lady Heather does issue the MON-VER command. If you write a log file (W L W)
the info is written as header comments in the log. The 5.0 release only writes
the first entry from the ROM info section. The next spin will write all the
available ROM info. My M8N returns 6 lines of ROM info (plus
Dave Congratulations on 10 Ghz SSB.
Now to your question. I will fully believe you are seeing normal behavior
of the generators. Even if its dithering 100 Hz thats pretty amazing. Sweep
gens simply are not stable enough for narrow work like you are trying.
Now I am sure comments will prove me total
The LEA-M8F is a complete GPSDO in module, the TCXO is EFC steered, no
sawtooth needed.
On Wed, Dec 21, 2016 at 8:30 PM, Bob Camp wrote:
> Hi
>
> Ummm…. because you need a 30.72 MHz reference in a 4G base station rather
> than the
> TCXO that normally is in the uBlox modules. You can then “carry
Hi David:
Do you have a comb generator?
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
Original Message
I run a test over the weekend with a fellow radio ham. I transmitted 100 mW
or so at
Can you use the VNA as a receiver? And determine whether the 100Hz shift is
also seen on the VNA
> On Dec 21, 2016, at 7:31 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
> wrote:
>
> On 21 December 2016 at 23:42, Dr. David Kirkby (Kirkby Microwave Ltd) <
> drkir...@kirkbymicrowave.co.uk> wrote:
Why to people always build 10MHz GPSDOs? If the use of the GPSDO is to
drive a microwave, why not build a MUCH higher frequency GPSDO.Is the
reason that 10MHz crystals just happen to be very good and there are not
good 100MHz ovenized crystals? Or for portable use could you not use the
1PPS
Hi
Ummm…. because you need a 30.72 MHz reference in a 4G base station rather than
the
TCXO that normally is in the uBlox modules. You can then “carry” the sawtooth
into the
SDR part of the basestation without a lot of muss and fuss.
Bob
> On Dec 21, 2016, at 5:48 PM, Bob Stewart wrote:
>
Mike Cook wrote:
> It wouldn't surprise me, but you have a reference for this?
I first read about this issue in the official Ublox forum Mike - try this link,
http://tinyurl.com/Fake-M8Ns
- at time of writing it leads to some of the messages that discuss
the issue with photos and examples of M
> on start up i have an odd behavior.
> 0, 1.99881895E+07
> 0, 1.99881912E+07
> 0, 1.99881757E+07
> 7, 1.99881856E+07
> 17, 1.99881878E+07
> 27, 1.99881900E+07
> What do you think?
Looks like you are expecting readings every 10 seconds but it's sending a few
samples duri
I run a test over the weekend with a fellow radio ham. I transmitted 100 mW
or so at 10368.115 MHz from an HP 83623A 10 MHz to 20 GHz sweep generator
http://www.keysight.com/en/pd-101862%3Aepsg%3Apro-pn-83623A/synthesized-sweeper-10-mhz-to-20-ghz-high-power?cc=GB&lc=eng
into a small horn ante
Hi
The missing element in your evaluation is phase noise. If you directly multiply
*any* 10 MHz source up to
10 GHz, you have created a noise monster. The only rational way to do it is
with a cleanup oscillator (or two)
somewhere between 10 MHz and 10 GHz. There are a variety of reasons why you
On 21 December 2016 at 23:42, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkir...@kirkbymicrowave.co.uk> wrote:
> But one thing to possibly is
>
> * Set sweep generator to 10.368 GHz
> * Set sweep generator to 10.378 GHz, so there's a 10 MHz difference.
>
I mean set the VNA to 10.378 GHz, so th
Hi John,
Could you tell me why one would use choose an LEA-M8F over an LEA-M8T?
Bob - AE6RV
-
AE6RV.com
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
From: John Haine
To: time-nuts@febo.com
Sent: Wednesday, D
Hi,
I've been absent from the list for a few years. A combination of relocation for
work, and other stuff going on. I'd not stopped altogether though. I have got an
antenna on the new QTH, my Thunderbolt boxed up and running and some other test
equipment sorted. Any way I randomly typed Odetics i
Hello Time Nuts, I have been on the group and have promoted it to other folks
for a while but this may be my first post here.
I am microwave amateur radio operator and I have question to pose relating to
the use of GPSDO's with amateur radio for microwave communication.
First, the more generic
It's worth noting, in case people don't know, that u-blox have a
specific chip & module (the latter being the LEA-M8F) for precision
timing, developed for the LTE (4G) base station market. This disciplines
a low phase noise 30.72 MHz reference to received satellite signals,
GPS/GLONASS/BeiDou.
Hello,
I have an SR620 that i am trying to get some more life out of. I have
dedicated a raspberry pi 2 to recode data and make the files available through
the network. I wrote a small c deamond that will setup the counter to make
frequency measurements and save the result to a file o
Hi
Given the short term stability limits on the frequency source (TCXO or XO) it’s
a pretty
good bet that the crystal in both oscillators is very similar. There’s not a
lot of difference
between a “normal” crystal and a “TCXO” crystal other than the angle of cut
tolerance.
Since the XO has fre
I have used Reyax modules with RS-232 outputs for a long time. The company
seems to be quite good. I trust them to be a reliable supplier and have never
had any problems with any of their units despite being used in some rather
harsh conditions.
> Some time ago, I bough
You seem to be assuming that the crystal in the TCXO is the same as the
crystal in the XO.
Wouldn't it be likely that the crystal would be higher quality in the
more expensive
product; the TCXO? How would a cheap crystal vs an expensive crystal
appear different
in the GPS data presented (igno
Some time ago, I bought two different modules from Reyax on ebay. One
module had a ublox M8N. Recently, I did some reading on several drone
forums about fake ublox modules from China. It seems that modules from
quite a few vendors are not genuine. From the information presented
about identifying th
Hi
> On Dec 21, 2016, at 4:20 AM, Mike Cook wrote:
>
>
>> Le 21 déc. 2016 à 00:08, Kiwi Geoff a écrit :
>>
>> Hello All - and Seasons Greetings,
>>
>> One of the advantages of the recent hobby drone phenomena - it has
>> brought to the market a lot of low cost GNSS modules that are
>> lightw
> Le 21 déc. 2016 à 00:08, Kiwi Geoff a écrit :
>
> Hello All - and Seasons Greetings,
>
> One of the advantages of the recent hobby drone phenomena - it has
> brought to the market a lot of low cost GNSS modules that are
> lightweight for drone flight control systems. Those of us with other
>
Mark,
Thank you very much for the effort you put into the new Lady Heather
Version 5 code.
Comments from other linux users encouraged me to try my luck with a
Raspberry Pi 2 Model B. The code compiled without issue and runs perfectly.
The pre-configured "heather.cfg" file is a nice touch, c
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