Re: LF: prosound amp

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Mal,

Re sub-9kHz, the general view is that a loop and preamp something like the M0BMU design reproduced on my sub-9kHz page of my website (see https://sites.google.com/site/g3xbmqrp/Home/10khz) is a good bet for receive, coupled with Spectran or Spectrum Lab or similar software running on a PC. Accurate calibration seems necessary to know where exactly to look.

With the signal and noise levels likely, I suspect that CW will be difficult and that slow QRSS or DFCW will be needed to get useful radiated distances, as Stefan has already shown Mal.

Still, with your big antenna and power you may prove everyone wrong and in a way I hope you do. Imagine hearing a DX signal on CW on 8.97kHz. 

73s
Roger G3XBM

On 16 August 2010 11:51, mal hamilton <g3kevmal@talktalk.net> wrote:

If and when I get going I shall be in CW QSO mode not Beacon.

The trouble I fear is being received. Most stations are not equipped with a suitable antenna for this frequency band.

It would be interesting to hear from those that are listening around this frequency what antennas and receivers are in use.

de mal/g3kev

 

 

 

----- Original Message -----

From: Roger Lapthorn

To: rsgb_lf_group@blacksheep.org

Sent: Monday, August 16, 2010 10:18 AM

Subject: Re: LF: prosound amp

Mal,

Have you applied for a sub-9kHz NoV? It would be a good idea to submit an application if not.

It sounds like you are thinking about how to get a decent strong signal out across the UK and Europe.

73s
Roger G3XBM

On 16 August 2010 10:01, mal hamilton <g3kevmal@talktalk.net> wrote:

Tnxd Steve for info. They look solid enough, but I suppose that is no
guarantee. There is no cct info but expect they use FETS
73 de mal/g3kev

----- Original Message -----
From: "Steve Dove" <dsp@hifidelity.com>
To: <rsgb_lf_group@blacksheep.org>

Sent: Monday, August 16, 2010 4:31 AM
Subject: Re: LF: prosound amp


> Hi Mal,
>
> Careful.  I don't know this brand specifically (Maplin?)  -
> wrong continent  -  but many prosumer amplifiers such as these
> are fairly liberal with what they call 'Watts',  and don't
> exactly say for how long they'll do those 'Watts'.  In short,
> not as many as you think, and for nowhere near as long as you
> might want.
>
> 'Real' audio amplifiers (i.e. real watts forever) tend to be
> expensive and from name brands in pro-audio world.
>
>           73
>
>                  Steve
>

--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM   GQRP 1678    ISWL G11088

-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk

http://www.youtube.com/user/g3xbm
G3XBM   GQRP 1678    ISWL G11088