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From: <jrusgrove@comcast.net>
To: <rsgb_lf_group@blacksheep.org>
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Date: Mon, 10 Dec 2018 15:58:59 -0500
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Subject: Re: LF: LF and VLF EbNaut
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BPSK transitions cause key clicks with non linear transmitters / amplifiers. As a practical matter 
... with the high Q transmitting antennas in use ... and that it's unlikely you'll have next door 
neighbor interested in LF reception ... it hasn't been a much of a problem.

Jay W1VD


----- Original Message ----- 
From: "DK7FC" <selberdenken@posteo.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, December 10, 2018 11:08 AM
Subject: Re: LF: LF and VLF EbNaut


> Hi Paul,
>
> Am 09.12.2018 20:02, schrieb N1BUG:
>> The first thing people want
>> to know is what equipment is required for LF EbNaut and how much is
>> this going to cost? But answers are hard to come by. I could never
>> get an answer as to whether my HP 3325B with high stability option
>> was good enough.
> The problem is also on the other side. I don't know what a HP3325B is, or, at least, i don't know 
> the technical details since i don't own one. So i can give no advice how to use it for EbNaut 
> transmitting
> Also there are different methods and each radio amateur is convinced about his own design.
> Some methods may be easier to realise but less precise and less flexible. So based on the skills 
> and needs and parts available one will decide for a certain design.
> Thus it is not so easy to write up 'the' way to go, there are many ways. For example, there could 
> be a 'how to EbNaut' including Linux components like ebkey, which will be useless for someone who 
> insists to avoid using Linux...
> So if you're asking the group, then you will get different advice, from different designs. And 
> this will be confusing! So concentrate on the basics and then choose your own design.
> I suggest to start in steps, don't plan to build the perfect system until the season is over.
>
> Basically all you need is an absolutely stable signal generator and a tool for inverting the phase 
> and managing the timing. This can be done with Windows and Linux.
> I think you are one of those who avoid using Linux. So then, you need SpecLab to generate the PSK.
> But step 1 is the stable signal.
> One method is to use an up-converter and SpecLab to generate EbNaut. SpecLab can generate a tone 
> on e.g. 12500 Hz which is then mixed with 125 kHz, so there is an output at 137.5 kHz. This is how 
> i do it here.
> I can tell you about other methods but this may lead to confusion already.
> Maybe there is one step before step 1, call it step 0: You need to decide, "YES i will now start 
> to transmit EbNaut and i will buy to necessary components, learn what is necessary to understand, 
> knowing it means effort!"
>
> What kind of signal generator do you use now?
>
>> When I asked about amplifiers for EbNaut I was told
>> linear is a must
> Do you remember who said that?
>> but now I find people are doing it with nonlinear
>> amplifiers
> Yes, a linear amplifier is not needed. It is BPSK, the output power is always at 100%, which is 
> good :-)
>
> 73, Stefan
>