Hellschreiber on LF

Andre' Kesteloot akestelo@bellatlantic.net
Tue, 08 Sep 1998 07:43:46 -0400

Hi Gang,

The other Saturday at Tacos Bob Bruhns was discussing the possibility of using
Hellschreibers on LF (with a waterfall type display).
The URL site mentioned below by ZL1BPU gives an excellent overview of
Hellschreibers, along with graphical examples.
This looks like a great way to go (and fun too)
Please check it out when you have a moment.

> ------- Forwarded Message Follows -------
> From:          murrayg@indcom.co.nz
> Date:          Thu, 3 Sep 1998 11:29:29 +1200
> To:            C.Trayner@elec-eng.leeds.ac.uk
> Subject:       MT-Hell on LF
> Hi Chris,
> I am writing to you because you seem to be "in charge" of the EuLF
> Home Page, and are likely to know as much as anyone about the subject!
> I feel that multi-tone Hellschreiber, in particular sequential MT-Hell, has a
> useful application in LF transmission, where weak signals and the ability
> to identify them is more important than data communication speed.
> My question to you is, do you know of anyone using, or interested in
> using MT-Hell to modulate or ID  their LF transmissions in the UK?
> As you probably realise, we have an LF band in New Zealand - 160 to
> 195 kHz, with most action centred on 181 kHz. There are probably a
> dozen active stations in ZL, and several have been heard in VK, where
> there is an experimental allocation, but no corresponding Amateur band.
> As yet none of the ZL LFers use MT-Hell, but I'm working on them!
> If you are interested in the weak signal advantages of MT-Hell, which is
> much simpler to use and cheaper to implement than most advanced digital
> modes, check out the following web site:
> http://members.xoom.com/ZL1BPU/Contents.html
> 73,
> Murray ZL1BPU, ex G0PFG