Graham

Tnx info

If you could contact him and ask him to divert to  Opera reporting sometimes it would be interesting since quite a number of MF OPERATORS are active at present. It would be a worthwhile exercise and QRSS would also be worth trying for a real time QSO

 

DE MAL/G3KEV

 

It would be interesting to compare OPERA against WSPR at that distance to FR5ZX

also it would appear that a QRSS QSO would be possible on MF

 

73 de Mal.G3KEV

 

 

 

From: VIGILANT Luis Fernández

Sent: Wednesday, November 11, 2015 10:11 AM

To: [email protected]

Subject: RE: LF: Re: FR5ZX on MF WSPR

 

Hi MF

 

Interesting conditions to Reunion last night

 

A total of 23 spots from FR5ZX. Only four stations reported

 

1 from G8HUH at -30

3 from SV8CS best -24

6 from DK7FC best -24

13 from EA5DOM best -19

 

From Rick Strobbe ON7YD reference site for LF antennas I have seen his calculations for a vertical

antenna with inductive topload. May be is the closer configuration to what I have managed to get here

 

http://www.strobbe.eu/on7yd/136ant/#IndTop

 

There is no mention to the feeding point for such antenna. In my setup H(L) is 80m and I'm feeding

at the coil base. Total H is 80+11= 91m

 

The Ra calculated from Rick formulas is over 8 Ohm (not mOhm)

This radiation resistance seems too much to be true. But results are proving really outstanding

 

I'm just feeding the antenna with 70W, believe it or not and it is not really resonanting on WPSR frequency but on 488KHz

as I adjust the variometer up at the antenna and then run a coax line to shack which changes it all

 

The 80m pipe which forms the H(L) is really more complex in practice. It goes down to building basement

and there splits into different pipes. One connects to presure compressor and water tank. The other runs

underground 40m to the twin tower and then runs up again another 80m into the twin (parallel) tower

The pipe section running underground is not metal, but plastic. The iner water column should work as

current conductor. That water is confined in the pipes and presurized. Should be saturated with metal oxide

similar to a heating circuit, so probably the plastic pipe got metal deposits inside which make it even better

conductor than the water colum itself

 

Any thoughts ?? Am I getting >10% efficiency ??

 

73 de Luis

EA5DOM 

 

---

De: [email protected] [mailto:[email protected]] En nombre de VIGILANT Luis Fernández
Enviado el: lunes, 09 de noviembre de 2015 16:01
Para: DK7FC; [email protected]
Asunto: Re: LF: Re: FR5ZX on MF WSPR

From WSPR database, FR5ZX transmitted in 503KHz. Is 630m band not allowed in Reunión?

 

73 de Luis

EA5DOM

 

Enviado en portable

------ Mensaje original ------
Desde: DK7FC
Fecha: 09/11/2015 14:48
Para: [email protected];
Asunto:Re: LF: Re: FR5ZX on MF WSPR

Hi Genosse Roman,

FR5ZX is using a resonated vertical antenna with capacitive top load near his house. He also transmits with this antenna.

73, Stefan

Am 09.11.2015 01:35, schrieb Roman RW3ADB:

Parteigenosse Stefan!

Any news about FR5ZX RX-setup? )

 

73!

Roman