Re: LF: Activity from DLF´s 360m mast

["Dick Rollema" <d.w.rollema@freeler.nl>]

Dear Walter and the LF-gang,

Assuming the 360m mast has no top load my antenna simulation program
gives a feedpoint impedance of
Z = 11.9 - j149 ohm over perfect ground. The reactive part depends on the
diameter of the mast of course which I have arbitrarily put  at
3m.
Be sure to measure the current into the mast so the EMRP can be
calculated.

I will probably not be at home to work you as we will spent the day with
several amateur radio friends at a camping site near Eindhoven. But I
will take my W & G SPM-12 with me, together with a frame aerial so I
hope I can measure your field strength.

Looking forward to an interesting experiment I wish you and your friends
good luck and a good match.

73, Dick, PA0SE 


At 22:24 15-7-02 +0200, you wrote:
> Hello to all
> LF`ers, 
> on Wednesday, 24th of July, the 153KHz transmitter of
> Deutschlandfunk in Donebach (JN49ON, 50Km SSE of Frankfurt) will be off
> air due to scheduled maintenance. By the friendly cooperation of the site
> personnel and with consent of the regulation authorities, a small group
> of German LF amateurs has been granted access to one of the 360m masts
> between 7:00 and 15:00UTC. With a little luck we might be able to achieve
> about 30dB more radiation efficiency than at
> home.
>      We will probably need some
> time to work out the impedance matching. After that, we intend to operate
> preferably in CW and Slow-CW modes. As we expect a rather high noisefloor
> from the Frankfurt area, we will bring along a tuned loop for receiving,
> and we will be QRV on 7030KHz in CW as well. If nothing else works,
> please give us a phone call on+49 174 3692499, or send an email note via
> the reflector or to dj2lf@darc.de or
> markusvester@aol.com.
>      Let`s look forward to a
> successfull day, hopefully without thunderstorms or strong
> noise.
> 73
> The group: Markus - DF6NM, Walter - DJ2LF, Ralph -
> DL2NDO, Ralph - DK3GH, Roland - DL3NDR, Franz - DL5NER
>