On 22/12/2016 16:04, David wrote:
On Wed, 21 Dec 2016 19:29:00 +, you wrote:
You may be able to identify the initial steady current drawn by the TCXO
heater, then the cycling once it's hit the right temp?
If there's no change at all in average current as it warms then it may
not have a
On Wed, 21 Dec 2016 19:29:00 +, you wrote:
> Can anyone comment on the following data, and whether they think the
> oscillator in "my" M8N is a XO or a TCXO ?
>
>Can you monitor the current draw from cold (ambient)?
>
>You may be able to identify the initial steady current drawn by
TCXO usually refers to Temperature Compensated Crystal Oscillator (no heater),
as opposed to Oven Controlled Crystal Oscillator (OCXO) which has an oven.
I would not expect a TCXO to become warm or draw more current at power up. An
OCXO would.
Didier KO4BB
On December 21, 2016 1:29:00 PM CST,
TCXO is not an OCXO, they don't have an oven. They compensate the
temperature induced drift using a temperature sensor, a microcontroller
and a table or parameter set for adjusting the output frequency. BTW,
for some applications they are unsuitable as they adjust the frequency
in steps.
Can anyone comment on the following data, and whether they think the
oscillator in "my" M8N is a XO or a TCXO ?
Can you monitor the current draw from cold (ambient)?
You may be able to identify the initial steady current drawn by the TCXO
heater, then the cycling once it's hit the
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
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
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
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
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
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
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
> 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
I don't know if you can tell the oscillator type from the receiver data. The
ADEV info isn't a true adev since it does not have and independent reference.
Heather has a keyboard command for making the lat/lon of your evil mad
scientist secret volcano lair private (G L P) so you don't have to
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
hobbies, like "Time Nuts" and RTK - these low cost modules can
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