NAGOYA NA-701

 INSIDE A NAGOYA NA-701

BY ANDY G0FTD (COPYRIGHT)

26-SEPT-2011

This antenna has been tested on 145Mhz/433Mhz/1296Mhz and FM broadcast band. It works very

well on all bands with acceptable SWR on all of them.

A basic analysis using MMANA modelling software reveals that the antenna should also have a

sharp resonance at 100Mhz. Indeed it seems to work better than some other antennas at the

broadcast band.

It has been used for QSO's on 1296Mhz with an Alinco G7E and it works very well. It performs a

simple ¾ lambda antenna.

FIG 1: BASIC PARTS

FIG2 – BASIC PARTS AND SCHEMATIC

FIG 3 – CLOSE UP OF COIL AND CAPACITOR ASSEMBLY

NOTE! There is NO connection to earth or ground in this antenna!

The antenna element is a wound bare copper wire around a plastic former. You will see that the top

half of the antenna is slightly smaller in diameter. There is no magic here, it jusr that the plasrtic

former is a smaller diameter ;-)

Regards,

Andy G0FTD

UWAGA! 

Nie jestem autorem tego opisu. Autorem jest Andy G0FTD i do Niego należą wszelkie prawa autorskie.

Opis był opublikowany przez Autora w intrenecie.

Słowo wyjaśnienia w kwestii połączeń:

Obwód rezonansowy LC i promiennik są przyłączone do środkowego pinu wtyczki. Ekran wtyczki czyli część z gwintem wkręcana do gniazda w radiotelefonie nie ma żadnego połączenia z elementami anteny. Utrzymuje ją tylko mechanicznie w gnieździe.  /HF5WWL/