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Re: LF: MF: EbNaut

To: [email protected]
Subject: Re: LF: MF: EbNaut
From: Paul Nicholson <[email protected]>
Date: Wed, 02 Mar 2016 13:02:34 +0000
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Congratulations Joe and Markus!  A new record, I make
that 4555 km and with a dB or two to spare.

That's really is a milestone for coherent at MF.  I wonder
if the propagation would stand longer symbols at that
distance.   Perhaps try 2 seconds?

> 00:30  2.2  0.8   0

Only losing 1.4 dB at most.   Maybe things get better at
very long range.

The next target would be 5418 km to Domenico.

Andy wrote:

> Consider using a Tee input low-pass filter,

I was using a Pi.   The next build will use a T if I'm
not using an antenna loading coil.

> A shunt C input will give large current spikes when hit
> with the square wave from a voltage mode Class-D PA

That explains then, why the spike went away when I reconfigured
for current mode.

Now it is all beginning to add up.  My next attempt at a PA
hopefully wont have so many elementary mistakes.
Paul Nicholson

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