From: Rob Renoud <k3rwr@md.metrocast.net>
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Date: Sat, 24 Mar 2018 17:56:21 -0400
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: K3RWR LF EbNaut in CT
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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
>