Re: LF: Dreamer RX

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Mal,

My "dreamers band" NoV has been with OFCOM since mid March. I chased it again last week. The hold-up is the Met Office, who have to vet sub-9kHz non-military applications. The men at OFCOM seem very keen to support these applications.

In the meantime I'm experimenting with local induction and conduction at 1-9kHz using 4W. This is quite useful as I've been playing with various ideas for loops and receivers. I'm no expert and I'm probably rediscovering things that people knew long ago. Still, it keeps me out of mischief and I'm enjoying it. 

When I have the RX system optimised listening "by ear" I intend to try my PC out in the fields with QRSS or WSPR to extend range. Best DX is 0.35kms so far - only 899kms short of Stefan's best DX, hi. When TXing with grounded electrodes I found that a loop works better at the far end than grounded electrodes. I also suspect the distance is effected by soil moisture between the probes at the TX end (size of the underground loop?) as on Monday I could hear my signals further than today and everything else was unchanged.

I've yet to try a voltage probe RX at sub-9kHz. The 80cm loop does seem to be useful as one can null mains hum and other noise sources. Close to houses and overhead cables the mains hum fog is appalling, but this drops very rapidly I've found as one moves away into open fields. Then the issue is electric fences (I think) pulsing away.

73s
Roger G3XBM

On 12 May 2010 19:04, mal hamilton <g3kevmal@talktalk.net> wrote:

LF/MF

How many have a RX capable of working efficiently on 9 kHz, proper antenna etc. Even on the higher LF/MF bands the weakness seems to be a good RX SYSTEM.

Something better than a probe, small loop is preferable especially on 9 kHz

To date in the UK  the uptake dreamers seem minimal, how many are actually listening, and how many NOV'S have been either issued applied for?

 

G3KEV

 

 

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