Re: LF: MF: EbNaut

[Markus Vester <markusvester@aol.com>]

I attempted to decode some IZ7SLZ data files between 19 and 21:30, but unfortunately there seemed to be no indication of a carrier at - 10 Hz, and no decodes either. Maybe I wasn't doing everything right, perhaps Domenico will be able to see more when he gets home. 

All the best,
Markus

-----Ursprüngliche Mitteilung-----
Von: Paul Nicholson <vlf0403@abelian.org>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 27 Feb 2016 10:40 pm
Betreff: Re: LF: MF: EbNaut

Thanks Markus.

> 02271924_sym.png

I see what you mean, the phase is a mess. I hope that's
propagation and not my transmitter! EbSynth is good but
I'm not convinced yet that the multiplier is behaving.

We've still got that discrepancy with the carrier strength
and BER. Perhaps that's just a consequence of the erratic
phase. That's something I've never properly tested for and
characterised.

I've been glancing at my signal on Gary's page at

http://myweb.tiscali.co.uk/wgtaylor/grabber2.html

Not being used to transmitting, it's quite a novelty to see
my signal on someone's spectrogram. This is good fun.

J.B. wrote

> go to a motor rewinding shop and get some of the sleeving
> they use to cover the connections of the windings to the
> fly-leads.

I know the stuff you mean, and it sounds ideal. Good idea,
and I may know a place I can get some. It seems that getting
the output transformer right is the hardest thing to do.

Andy I'll have a look at those cores - I didn't know if they'd
be any use at MF. I've got a pile of dead PC power supplies to
strip down or maybe I'll get one from RS. I'm baffled by all
the different core materials, I can never figure out what's
suitable for what and there are so many.

TX still on, valid EbNaut messages since 18:00, will probably
run for another hour.
--
Paul Nicholson
--