To: rsgb_lf_group@blacksheep.org
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 <5C19FFCB.1060305@posteo.de>
 <0E0AEF52-CE89-4E56-A2E1-77C2F9815B4B@md.metrocast.net>
From: "Stan, W1LE" <stanw1le@verizon.net>
Message-ID: <8dfc765f-1dd1-3ae9-8b87-bec20ab65335@verizon.net>
Date: Wed, 19 Dec 2018 11:49:30 -0500
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Subject: Re: LF: Ebnaut receiver frequency stability qustion
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Hello The Net:

Which specific UBLOX GPS model is best for NMEA output, 1PPS, and the 
unmodulated auxiliary RF output?

I hope all have the very best of this Holiday Season.

Stan, W1LE    Cape Cod   FN41sr


On 12/19/2018 6:58 AM, Rob Renoud wrote:
> Hi Stefan, Luis, LF EbNaut,
>
> There are several who believe the converter circuit approach is a viable path to  EbNaut RX capability.  I think three things are needed at this point:
>
> 1) Circuits
> 2) Identification of suitable Local Oscillator hardware (possibly for both RX and TX)
> 3) Clear and concise software configuration and operation instructions for Spectrum Lab, EbNaut-tx, EbNaut-rx, etc.
>
> Toward that end, I will set up a converter circuit and begin tests using K3SIW’s LowFER EbNaut beacon on 185.185... kHz with the goal of producing EbNaut configuration and operation instructions for the converter approach.
>
> Additional thoughts and suggestions are welcome.
>
> 73,
> Rob - K3RWR
>
>> On Dec 19, 2018, at 03:22, DK7FC <selberdenken@posteo.de> wrote:
>>
>> Hi Luis, LF,
>>
>> I agree, this is indeed the most reasonable design. Using the same here ;-) but a 125 kHz LO, locked to GPS.
>> Maybe we should provide easy converter crcuits. A compromise between high end and easy to build up, for the 'EbNaut-newcomers'?
>>
>> 73, Stefan
>>
>> Am 19.12.2018 07:39, schrieb VIGILANT Luis Fernández:
>>> Hi EbNaut
>>>
>>> I think that using expensive receivers is NOT the way to go. I'm using a simple mixer as downconverter. The LO is 120KHz generated from a uBlox GPS. So the 137KHz outputs as 17KHz and can be feeded to PC soundcard. The second channel of GPS provides 1pps to discipline the soundcard using Spectrum lab
>>>
>>> Not using filters at all and no amplifier stages. So there is room for improvement, but it works
>>>
>>> 73 de Luis
>>> EA5DOM
>
>

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    <p><font size="-2">Hello The Net:</font></p>
    <p><font size="-2">Which specific UBLOX GPS model is best for NMEA
        output, 1PPS, and the unmodulated auxiliary RF output?</font></p>
    <p><font size="-2">I hope all have the very best of this Holiday
        Season.</font></p>
    <p><font size="-2">Stan, W1LE    Cape Cod   FN41sr</font></p>
    <p><font size="+2"><font face="Courier New, Courier, monospace"><br>
        </font></font></p>
    <p><font size="+2"><font face="Courier New, Courier, monospace"></font></font><br>
    </p>
    <div class="moz-cite-prefix">On 12/19/2018 6:58 AM, Rob Renoud
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:0E0AEF52-CE89-4E56-A2E1-77C2F9815B4B@md.metrocast.net">
      <pre class="moz-quote-pre" wrap="">Hi Stefan, Luis, LF EbNaut,

There are several who believe the converter circuit approach is a viable path to  EbNaut RX capability.  I think three things are needed at this point:

1) Circuits
2) Identification of suitable Local Oscillator hardware (possibly for both RX and TX)
3) Clear and concise software configuration and operation instructions for Spectrum Lab, EbNaut-tx, EbNaut-rx, etc.

Toward that end, I will set up a converter circuit and begin tests using K3SIW’s LowFER EbNaut beacon on 185.185... kHz with the goal of producing EbNaut configuration and operation instructions for the converter approach.

Additional thoughts and suggestions are welcome.

73,
Rob - K3RWR 

</pre>
      <blockquote type="cite">
        <pre class="moz-quote-pre" wrap="">On Dec 19, 2018, at 03:22, DK7FC <a class="moz-txt-link-rfc2396E" href="mailto:selberdenken@posteo.de">&lt;selberdenken@posteo.de&gt;</a> wrote:

Hi Luis, LF,

I agree, this is indeed the most reasonable design. Using the same here ;-) but a 125 kHz LO, locked to GPS.
Maybe we should provide easy converter crcuits. A compromise between high end and easy to build up, for the 'EbNaut-newcomers'?

73, Stefan

Am 19.12.2018 07:39, schrieb VIGILANT Luis Fernández:
</pre>
        <blockquote type="cite">
          <pre class="moz-quote-pre" wrap="">
Hi EbNaut

I think that using expensive receivers is NOT the way to go. I'm using a simple mixer as downconverter. The LO is 120KHz generated from a uBlox GPS. So the 137KHz outputs as 17KHz and can be feeded to PC soundcard. The second channel of GPS provides 1pps to discipline the soundcard using Spectrum lab

Not using filters at all and no amplifier stages. So there is room for improvement, but it works

73 de Luis
EA5DOM
</pre>
        </blockquote>
      </blockquote>
      <pre class="moz-quote-pre" wrap="">


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