Re: VLF: Transatlantic success East to West

[Paul Nicholson <vlf0403@abelian.org>]

Stefan wrote:

> f = 17470.1000 Hz
> Start time: 18.Dec.2017  21:30:00 UTC
> Symbol period: 45 s
> Characters: 2
> CRC bits: 14
> Coding 16K21A

Eb/N0 -4.9 dB with that one.

Perhaps two more repeats necessary.

> So i'm trying a new message with just 2 characters before
> going down to 5170 Hz.

I look forward to that, it is the best way to test the new
H rx, to see if the strange noise floor seen in the old rx
has gone.

PS

Having some last minute problems with the new rx: the PSU
does not start reliably when fed via a long cable.  Had
this problem with the E rx and it appeared to be the
reservoir caps too high.    Now I discover the cause is
the resistance of the cable.   Just ordered 48V to 12V DC/DC
converters and a 48V power supply, hopefully that will be
less sensitive to the cable resistance.  Next day delivery
but it wont arrive in time to use it tomorrow. I'll have
to improvise something out of the junk box!

PPS
A test run today - managed to avoid The Grendel with a
carefully timed sausage and got through the farm yard
without being bitten!   Not thinking ahead, I'd only
taken one sausage with me.   You can guess what happened
on the return trip.

--
Paul Nicholson
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