Message-ID: <5C5368DC.3000606@posteo.de>
Date: Thu, 31 Jan 2019 22:30:04 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <1UTCZw4Jzr.F7dZYpniNns@optiplex980-pc> <5C52F3F6.5080906@posteo.de> <5C5312CF.7010000@posteo.de> <67304ac6-a695-852b-8871-8d8c8e941aaa@dctower.co.uk>
In-Reply-To: <67304ac6-a695-852b-8871-8d8c8e941aaa@dctower.co.uk>
Subject: Re: LF: NEO-7M as a frequency source
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Hello Nick,

Thank you. Good to know that it works for someone. And you're also using 
a NEO-7M, right?
/dev/ttyACM0, is that an usb-to-serial converter? I'm using /dev/AMA0, 
which is the TXD/RXD pins on the GPIO port. So i just need to use 4 
wires and connect the module to the Raspi...
I could try to use the usb-to-serial adapter connected to the Raspi but 
that is a rather uncomfortable work-arround and even more power consuming...

...would like to try to transmit EbNaut on 137 kHz directly from such a 
module.

73, Stefan


Am 31.01.2019 18:04, schrieb Nick:
> On 31/01/2019 15:22, DK7FC wrote:
>    
>> Hello dear GPS experts,
>>
>> I'm still struggling with my NEO-7M and vlfrx-tools. Instead of the
>> standard ucenter software i use my Raspi and vlfrx-tools to configure
>> the module. Using the vtubx
>> <http://abelian.org/vlfrx-tools/notes.html#vtubx>  tool, i can configure
>> the time pulse as expected, for example
>> *vtubx -P 1e-1 -S /dev/ttyAMA0*
>> leads to a blinking LED with 100 ms on-time. So the communication works
>> fine.
>> However,with
>> *vtubx -F 10 -S /dev/ttyAMA0* or *vtubx -F 1,10e1 -vv -S /dev/ttyAMA0*
>> the LED gets and stays dark, i.e. no frequency output.
>>
>> Now i tried to use the old u-center software and there i can configure
>> the TP output as expected to a frequency of say 20 Hz and there the LED
>> is indeed blinking.
>>
>> Does someone have tried to use vtubx and have some experience? What am i
>> doing wrong?
>>
>> 73, Stefan
>>
>>
>>
>>      
> Stephan,
>
> Here on a Centos box (yes I know ...) it all works as expected (after I
> got the dependencies resolved)
>
> vtubx -F 10 -S /dev/ttyACM0 gives a nice fast flash rate of the LED
>
> vtubx -F 1 -S /dev/ttyACM0 puts it back ...
>
> Regards
>
> Nick
> M0HGU
>