IZ7KHR Radioamateur Station » delta loop

Late Dx Activity

admin — Mon, 19 Oct 2009 20:30:49 +0000

After few days of Antenna’s maintenance I have reassembled and completed the 2 elements moxon for 40m, now it is a wonderful and pile-up breaker antenna, as my usual!!!!

I have contact, without problems and waste of time, 3D2MJ Fiji Island, both in 40m and in 20m phone, he had a nice real 59 in 40m.

After the good results with the Dxpedition FT5GA, I have complete this last week with other two Dxpeditions and so other two new ones for my DXCC:

K4M Midway island, very difficult to contact due to polar path for Italy, but after some search, at 22.30z circa I have pounced it in 20m and the op was Max I8NHJ!

ZY0T Trinidade island, a very strange dxpedition, good signals but I think that ops had receiving problems, I have made many calls and with great difficults I have contact them only on 15m.

The two elements 40m Moxon is up!

admin — Wed, 02 Sep 2009 13:15:55 +0000

Hi!

Now also the 40m two elements Moxon is on the tower. I have used the same boom of my Delta.

The KD6WD’s site is a very good resource to build a Moxon antenna. You can download a Win software that provides all measures of the Moxon rectangle.

The Moxon antenna concept is very revolutionary, it consists to fold part of the element in the point of minimum current flow. So the dimensions of the antenna are very compact against a typical yagi dimension. There is also the possibility to reduce the lenght of the elements introducing coils and I think this is a good trick with a moxon for 40m!

I haven’t use coils, but the length of the two elements are very big; my elements consist of the first part of Alluminium and other 6m with a fiber-glass fishing pole joint with fiber-glass sheet and Epoxy.

So, due to the extreme length of the elements, I think that shortly I will modify the antenna with coils, but there is two possibilities: reduce the moxon with the coils, or build a short yagi with coils and 4.8m of boom.

This the photo of my antenna system at this moment:

QRV operations from Dolomiti IZ3/IZ7KHR

admin — Sun, 02 Aug 2009 19:57:10 +0000

I will spend 2 weeks in holiday. I’m going to Cortina D’Ampezzo, a beautiful place on Dolomiti mountains, in the North-East of Italy.

My location will be at 1500m on the sea level. I’m bringing with me a YAESU FT-897 with some portable antennas. I have build a multiband fishing-pole antenna and a single-element delta loop for 6m and 2m. I will upload some photos of those installations.

In case of some portable activities I have included in the pack also a multiband mobile antenna with a magnetic base for a mobile installation.

There will be many good locations for portable operations, also for S.O.T.A. (Summit On The Air), but now I don’t have any idea about these opportunity. I will consider them evaluating wheather conditions and every others difficulties.

In every case I will prefer activity in 6m and, if the propagation will be good, also in 2m. In HF I will test digital and SSTV modes.

Some pictures of Dolomiti:

DXbuster- L’acchiappa DX!

admin — Sat, 01 Aug 2009 11:24:33 +0000

Hi guys!

The test of my antenna in finished! I can said that it works very fine!!!

I have changed the name of the Monster, hihihihi, now it is DXbuster….This is the extract of my log in the last days:

vk7ze 20m ssb – Tasmania

vk6dxi 20m cw – Australia

kh7xs 15m cw – Hawaii

vk9ni 20m cw – Norfolk isl.

zd7vc 20m ssb – St. Helena Isl.

5v7prf 20m ssb – Togo

zl1ird 20m ssb – New Zeland

7p8mm 20m cw/7p8cf 20m ssb – Kingdom of Lesotho

5r8fu 20m ssb – Madagascar

MDXC 10m ALL ITALIANS CONTEST 2009

admin — Sun, 21 Jun 2009 21:51:37 +0000

Ottimo e divertente contest nostrano. Si è rivelato un ottimo laboratorio di test della mia delta loop, permettendo di sperimentare sia situazioni propagative molto diverse e variabili in maniera repentina, sia per studiare i vari skip del segnale sulla corta distanza sfruttando i rimbalzi offerti dai due mari italiani: Adriatico e Tirreno.

Il sabato pomeriggio è stato di rodaggio! Con molti cambi di puntamento ho compreso che era più semplice raggiungere il nord italia per via diretta a 315° circa, piuttosto che puntare in diretta il sud. Di certo la posizione più proficua si è rivelata essere quella a 270°, praticamente sul Lazio. Da quel puntamento ricevevo ottimi rapporti di segnale dal nord e riuscivo a farmi sentire anche nel sud, specialmente in Sicilia.

Questa posizione poi è rimasta quasi sempre la stessa durante la domenica mattina permettendomi ottimi contatti. E’ risultato molto difficile il contatto con skip corti, tipo altre province della mia regione e limitrofe (Brindisi, Taranto, Matera…).

L’idea che mi sono fatto è che l’accentuato angolo di irradiazione della mia delta riuscisse a sfruttare il Mar Tirreno come ottimo specchio riflettente, cosa che, invece, non è avvenuta in tal misura con l’Adriatico che ho a 500m dal mio qth verso est. In definitiva era un risultato atteso, ma che non mi ha risparmiato emozioni! Ringrazio tutte le stazioni che mi hanno collegato e in particolar modo tutte le stazioni portatili e qrp che sono sempre riuscito a tirar fuori con sommo piacere! Il prossimo anno sarò pronto a battagliare per i posti alti in classifica.

Di seguito qualche video girato alla ben e meglio durante il contest:

The monster is up!!!

admin — Mon, 15 Jun 2009 21:17:16 +0000

The first step of my new big antenna system is done! The monster is up and work very very fine!!!

Now I’m waiting for the second step: build a 2 elements moxon for 40m. I’m waiting the fishing poles…

The delta loop works very fine with optimal S.W.R.. I think to test it during the 10m all italians contest of this weekend.

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Ok, la delta loop è finalmente su! Le prestazioni sono ottimali! In attesa delle canne in fibra per fare la 2 elementi moxon per i 40m, voglio testare l’antenna durante il contest italiano 10m di questo fine settimana, spero di avere tempo.