EA5HVK

This is a balun 1:1 using exclusively transmission lines (in this case Coaxial Cable).

It uses a labmda/2 line lenght to create a different of phase of 180º that compensates the 180º of the dipole and we get a relationship of 4:1.

Two sections of lambda/4 are been added to get a final relationship of 1:1. 

This balun only is valid for monoband antennas (or multibands with a multiple of 3 lambdas). And BW of adaptation (dipole+balun) is aprox. 5%.

I like this balun because you can design it with a good accurate.

Remember that:   lambda_cable  =  lambda_air x Speed Factor

Usually, Speed Factor is 0.67 for Rg-58 CU or RG-213. This parameter appears in the cable specifications.

With ROS 4.5.7 Beta you can insert the Callsign, Name, Locator and QTH doing an only click with the mouse.

 In the case of QTH you have to press “CRLT key” too.

ROS user Guide in German, courtesy of Eike, DM3ML 

http://www.mydarc.de/dm3ml/            http://www.qrz.com/db/DM3ML

 Thank you very much, Eike.

En el programa de hoy tenemos una entrevista con Jimmy Brouzon ZB2BL radioaficionado gibraltareño.Seguiremos con HABLAMOS DE DIGITALES con Jorge García EA8TL. Finalizaremos con el RINCON DE JOSE ALBERTO NIETO ROS.ENTREVISTAS DE RADIOAFICION no se hace responsable de las opiniones de sus entrevistados.

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ROS F.A.Q in Czech, courtesy of Zdenek OK2PAD 

Great QSO reported by Dave G3ZXX with Oleg UT5UBB with only 2.5 watts on 10144

Hi All,

Just thought that it might be NEWS worthy, but I’ve just had a QSO with Oleg UT5UBB, on 10144 Mhz.

Cheers & 73
Dave, G3ZXX

ROS F.A.Q in French. Translation courtesy of Jose F4BSX 

Thank you very much!

Sometimes, the first characters in the message are broken:

>> RX1: 19:28 @ 5.4 Hz: O4WGT <STOP> -34 dB
>> RX1: 19:33 @ 5.4 Hz: G4WGT <STOP> -31 dB

This problem will be fixed from July 3 at 00:00:01 UTC with some changes in the ROS protocol. You only have to renove your old ROS version.

73, Jose Alberto

ROS v4.5.4 has the option of Russian language (with English symbols)

Translation courtesy of Serge RV3APM http://www.qsl.net/rv3apm/

Thank you very much!