[minima] Re: Minima BFO Question
- From: farhanbox@xxxxxxxxx
- To: minima@xxxxxxxxxxxxx
- Date: Sun, 16 Mar 2014 05:08:14 +0000
One way (that I use) is to connect the audio output to a laptop and run an
audio spectrum analyzer (I use spectrum lab written by DL4HF).
Connect the antenna and tune to a spot that doesn't have any signals. As the
noise is uniformly spread across the spectrum, you will see a brick of audio
that about 3-4khz wide stand out.
When you tune the bfo, this moves around, you can set it to rise around 200 Hz
and subside around 4KHz.
For the LSB, you do the samething, just see to it that the bfo is on the other
side (the audio brick should move down as you tune the bfo upwards).
- f
Sent from BlackBerry® on Airtel
-----Original Message-----
From: Thomas Sarlandie <thomas@xxxxxxxxxxxxx>
Sender: minima-bounce@xxxxxxxxxxxxx
Date: Sat, 15 Mar 2014 22:00:48
To: minima@xxxxxxxxxxxxx<minima@xxxxxxxxxxxxx>
Reply-To: minima@xxxxxxxxxxxxx
Subject: [minima] Re: Minima BFO Question
Eldon,
I still have not really finished this either. I understand how to set the
BFO frequencies at the edge of the crystal filter but I think that will
have an impact on the actual frequency that I am transmitting or receiving
on. Even 2 or 3 kHZ seems like a decent error...
I think the correct thing to do would be to adjust the LSB/USB frequency
offset in the code once you know what are your BFO frequencies. Food for
thought - Hope I am not adding confusion ;)
I just saw your site. Love your construction style. Really elegant and fun.
How do you assemble all the modules together?
73,
thomas
On Fri, Mar 14, 2014 at 10:22 AM, Eldon Brown <eldonb46@xxxxxxxxx> wrote:
> Thanks Wayne,
>
> Those are the conclusions that I was approaching, and thanks for the link.
>
> Regards,
> Eldon Brown
>
> 73 - Eldon - WA0UWH - CN88xc - http://WA0UWH.blogspot.com/
>
>
>
>
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