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From: N1BUG <paul@n1bug.com>
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Date: Sat, 24 Mar 2018 18:39:53 -0400
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Subject: Re: LF: K3RWR LF EbNaut in CT
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Rob, EbNaut, LF,

Please do share details of how you modulate the 3325 for EbNaut. I
would like to try some experiments to see if I can transmit.

I am a long way from receiving capability as I think that is going
to take all new hardware and a very different approach to what I am
using now.

By the way Rob, your signal is strong here, seen and heard but of
course I have no way to decode it.

73,
Paul N1BUG


On 03/24/2018 05:56 PM, Rob Renoud wrote:
> Paul & LF,
> 
> I am using an HP3325A with an external GPS-stabilized 10 MHz
> reference  as the exciter for my current  EbNaut transmissions on
> 2200m.  The 3325 feeds my Hafler 9505 amplifier through a
> MiniCircuits ZHL-32A preamplifier that is part of my regular
> 2200m tx system.
> 
> The 180 degree phase shift modulation is accomplished in the 3325
> through the application of control voltages to the external phase
> modulation input port on the 3325.    I can provide the details
> of the control setup as used here.
> 
> Hope this helps regarding use of the HP3325 for EbNaut TX.
> 
> 73, Rob - K3RWR
> 
>> On Mar 24, 2018, at 10:12, N1BUG <paul@n1bug.com> wrote:
>> 
>>> On 03/24/2018 09:18 AM, VIGILANT Luis Fernández wrote:
>>> 
>>> Anyway would be interesting to discuss the hardware needed
>>> for decoding EbNaut in LF Would help others to figure out how
>>> to start using their stations already decoding WSPR, etc
>> 
>> Yes, please! We need help!
>> 
>> I have similar questions as Luis.
>> 
>> I'm using a simple home built SDR feeding I/Q to a sound card,
>> HDSDR output to a virtual cable (VB Cable).
>> 
>> Do I need to worry about sample rate correction on VB Cable? If
>> so is there any way to do it?
>> 
>> Do I need to worry about sample rate on the sound card which
>> is receiving I/Q from the SDR? If so, is there any way to do
>> it? Both left and right channel are in use.
>> 
>> What about time stamping? There are some delays I think in
>> HDSDR. I don't know if there is any way to work around this.
>> 
>> I would need a more stable LO for the SDR than its present
>> crystal oscillator! I still don't know how to do this at
>> reasonable cost. I suppose it will require a GPSDO which could
>> output 450 kHz or something around there, but I have no
>> practical idea how to do this. The more I read, the more
>> confused I become.
>> 
>> By the way I have a HP 3325B. Is this of any use for either
>> the receiver LO or for transmitting EbNaut? It has the internal
>> high stability option but I assume this is nowhere near good
>> enough. It can accept external reference at 1 or 10 MHz but I
>> do not know if this can make it good enough for anything. It
>> also has a Phase mod input, but I know nothing about this.
>> 
>> 73, Paul N1BUG