Hello Andy,
I think that G3YXM at wireless dot org dot uk might be able to help
you as he has a lot of information on LF at
http://www.wireless.org.uk/
Regards
Lawrence

On 2/20/16, F6CNI - Andy - JN19QB <[email protected]> wrote:
> Hello Andy.
>
> Not about the first claimed 73kHz QSO, but just for info :
>
> the first time I heard Peter G3LDO on 73.4 kHz normal CW ( 338 km ) was
> around november / december 1996. Later, I had my first xband QSO 73.3 /
> 3.570 kHz with him 28 march 1998. I received his nice QSL for this event. It
> was, I think, the only all time QSO normal CW xband from UK to outside UK.
> But Peter and probably others UK stations had also some “DX” QRSS QSO xband
> 73 / 137 : one day ( I do not remember the date ) I see Peter in QSO QRSS3
> with HB9ASB...
>
> 73 de Andy F6CNI.
>
> From: Andy Talbot
> Sent: Friday, February 19, 2016 11:40 PM
> To: [email protected] ; [email protected]
> Subject: LF: Original 73kHz first.
>
> Can anyone remember what the first claimed 73kHz QSO  was .  I seem to
> remember it was a few tens of metres across a car park, probably in 1996
>
> (Strictly, that was a capacitor not radiation, but...)
>
> I'm giving a talk on LF/MF in a couple of weeks, and want to get the
> timeline right.
>
> Andy  G4JNT