RE: LF: Dreamers Band update from W1VLF

[Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>]

Hello Paul,

 

congrats on your achievement.

Based on L = 0.277H and f = 8890Hz the antenna capacitance is 1.16nF. You must have an impressive amount of wire up in the air.

Regarding "ground" : did you try radials ? 

 

73, Rik  ON7YD 

 

---

Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Paul A. Cianciolo [paulc@snet.net]
Verzonden: zaterdag 17 april 2010 15:53
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: RE: LF: Dreamers Band update from W1VLF

Markus

 

Valued commentary as always. Plans are to continue making improvements in the station. 

 

What are your feeling about the ground at 9 KHz?

 

Currently I am using 3   2 meter ground rods spaced 2 meters apart  and 1 meter distant from the concrete basement wall of my shack.

 

This setup is not optimum I understand and was never intended to be final ground system for my regular ham station.

 

As a very quick and crude test I pounded an aluminum pole into the earth 2 meters deep near the 9 KHz coil.

When this was connected to the existing ground there was a very small increase in the current meter.

 

Antenna system impedance here is about 1250 Ohms  with and antenna current of approx. 200 ma.

Lots of work to do!!!

 

I will make another post on grounds to the group as well.

 

Thank you

 

PauLC
W1VLF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 -----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Markus Vester
Sent: Friday, April 16, 2010 4:29 PM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Dreamers Band update from W1VLF

Dear Paul and Jay,

 

this is an excellent result, well done!

 

The crossover between reactive nearfield (E ~ r^-3) and farfield (r^-1) occurs at lambda/2/pi = 5.3 km. As you seem to have quite a bit of margin there, your signal will be detectable very significantly beyond that. Assuming otherwise equal receive conditions, QRSS-120 should get you more than 6 times further than QRSS-3.

 

Best wishes,

Markus (DF6NM)

 

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

From: Warren Ziegler

To: rsgb_lf_group@blacksheep.org

Sent: Friday, April 16, 2010 8:05 PM

Subject: Re: LF: Dreamers Band update from W1VLF

Paul,

      Great work! Nice looking coil!  How much power can you crank through it?
At 5kM, I believe that you are still in the near field (9kHz
wavelength is 33km), so signal will fall off at the 3rd power of
distance until you reach far-field conditions.

--
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1


 at 1:51 PM, Paul A. Cianciolo <paulc@snet.net> wrote:
> Hello Folks,
>
> Today we made our first outdoor transmission on VLF.
>
> The system resonance forced the transmissions to take place on 8890 Hz at
> least until I can get a variometer worked up.
>
> The distance is only 5 KM but the signal is quite good on QRSS3.
>
> I can only wonder how far the signal would go using QRSS 120???
>
> Please comment if you can, this a great learning experience for me
>
> Thank you
>
> PauLC
> W1VLF
>
> http://www.rescueelectronics.com/9-Kilohertz.html
>