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Re: LF: Ebnaut receiver frequency stability qustion

To: "[email protected]" <[email protected]>
Subject: Re: LF: Ebnaut receiver frequency stability qustion
From: "[email protected]" <[email protected]>
Date: Wed, 19 Dec 2018 07:13:43 -0500
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> Additional thoughts and suggestions are welcome.

If using an untuned loop or e probe antenna (any untuned antenna for that 
matter) you'll want to include a front end filter to remove the image. Even if 
there are no signals at the image frequency you still don't want the noise 
contribution.

Jay W1VD   


----- Original Message -----
From: Rob Renoud <[email protected]>
Reply-To: <[email protected]>
To: <[email protected]>
Sent: 12/19/2018 6:58:56 AM
Subject: Re: LF: Ebnaut receiver frequency stability qustion
________________________________________________________________________________

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 <[email protected]> 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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