Re: LF: Ebnaut receiver frequency stability qustion

[N1BUG <paul@n1bug.com>]

I agree 100%, Rob.

To me items 1 and 2 are the most critical up front. A mistake
configuring free software is minor compared to a mistake buying the
wrong hardware. The latter could mean long delays before another
attempt.

Per Jay's comment, I prefer to include filters wherever they would
improve performance. Generally, receive filters are cheap and easy...

73,
Paul



On 12/19/18 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