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 <[email protected]> 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
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