F5jwf Note Book

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11.12.2012

Nouveau synoptique pour la station 3cm

Monitoring :

- Courant cathode et helix du TWT

- Etat du PTT pour changer de fréquence TX/RX pour le crossband

- Reset de l’alim TWT en cas de mise en sécurité

Vidéo du synoptique en TX (192Mo mais c’est de la HD !!)

16.04.2012

Essai nouvelle station EME13cm

Nouveau transverter 13cm avec deux platines powerwave en parallèle.

Quelques echos en primeur

Video : Spectran et Synoptique Station 13cm

Audio file: f5jwf_13cm_16042012_f.wav

29 mai 2009

Emission de la radio suisse romande sur le morse

F5jwf présente sa station à un journaliste de la RSR 20090529-m-comme-morse-4-5.mp3

1 april 2008

Modification TWT to increase output power

An OM italian from the IQ4DF team (http://www.crbr.it/ I don't remember the call sorry to him) has described modifications to do on TWT to improve output matching in order to increase output power. The complete power point presentation can be downloaded under TWT output matching improvement.pdf

18 février 2007
Essai Press and Peel : Film pour circuit imprimé par transfert

Il s'agit d'un film bleu imprimable à la laser (et seulement à la laser) que l'on transfert directement sur le cuivre du circuit par thermo pressage.
C'est similaire  au  transfert de toner mais l'immense avantage  c'est que ça se décolle impeccablement (pas de reste de papier). Ensuite bien sure,  il reste à graver à l'acide.

Voir quelques explications sous Press and Peel.htm

27..28 janvier 2007
First trial on 23cm EME with my new station

I worked on January 27/28 on 23cm. It was my first trial with my brand new station and surprised, for my first key down , I could hear my echoes about 8dB above the noise. I was working with LDMOS PA which give 130W and I have planned to couple few such device in parallele to get little more power. I use the same 12 foot solid dish with home made tracking than for 3cm. The feed of the antenna is base on OK1DFC septum.
I worked in CW LA8LF, LA9NEA, ON7UN, OK1CA, LX1DB, K5JL, ES5PC, RW1AW, IK3COJ, G3LTF
Then few stations in JT65C: ES5PC, ES6RQ, SM5LE, JA6AHB
Of course all of them are for initial. I will now spend some time to get this system heavy-duty and waterproof , specifically the 26V power supply which was temporarily installed in the food of the mast. I have planned to be on the air for the upcoming contest.

2 april 2006

Circular polarisation trial with DK0SB

G4NNS activate DK0SB Bochum 20m antenna with 40 TWTA. Those trials were planned to analyse circular polarisation and effect on signal spreading.

Brian transmit key down continuous signal in vertical linear polarisation during 2 hours.

The receiving signal on my side was in the range of 28 to 30dB over the noise (BW~3Hz) with 3.7m dish and vertical linear polarisation.

Very stable and strong signal during the 2 hours of the test.

At the end of the test time at 14H40 I have got heavy rain in my location. I did not see any significant loss on the signal neither spectral spreading.

Animated Spectran video dk0sb_2.3.2006.avi

Time (GMT)	Remark	Audio file	Size
13H13	Call and key down	dk0sb_2.3.2006_13h13.mp3	323k
13H02	Key down wave file	dk0sb_2.3.2006_13h02.wav	2.8M
	Key down mp3 file	dk0sb_2.3.2006_13h02.mp3	468k
14H40	Key down wave file	dk0sb_2.3.2006_14h40.wav	2.7M