A simple Arduino UNO driving for Yaesu G-450 Antenna Rotator

Details: Hits: 921

After only 2 years, my G-450C Yeasu passed QRT.

A strip examination of the electrical motor and the control board indicated that the potentiometer inside the motor and the control board passed out.

I asked to my Hamshop to order spare parts from Yeasu : answord was NUTS ! Rest assusred that it will be my last purchase at Yeasu.

So, I first replace the potentiometer of the electrical motor.

I disconnect the connectors going to control board (excepted for 12v, who was always Ok) and I replace the control board it with a UNO R3.

A basic knowledge of Arduino is requiered.

I decline any responsibility as for the direct consequences or indirect for any nature which could resultny nature whithch could result by using this solution with another rotator model.

Ameritron RCS-4 modifications

Details: Hits: 7834

Suite à une défectuosité du transfo d'alimentation, une grande partie des composants de mon switch d'antenne Ameritron à été détruite.

En outre des LEDS, toutes les diodes ont sauté ainsi que les relais de commutation ainsi que les électrolitiques.

Pas surprenant si on regarde le schéma du communtateur

Les modifications apportées sont les suivantes :

- Ne plus fournir de tension de commande des relais via le câble coaxial

- Eviter que ce 12V AC qui transite par ce même câble coaxial ne soit présent à l'entrée d'antenne du transceiver.

- Eviter deux polarités.

- Protéger les E/S coaxiales contre les surtensions dûes à la foudre

- Améliorer la longévité des bobines de relais

- Eviter une surtension de commande

A Dual Band 4 element Cubical Quad Antenna

Details: Hits: 1741

Modelling, building and measuring a 4 element Dual Band Cubical Quad antenna (6m-4m).

Methodology adopted :

1) Make your antenna choice according to your exeptations and your attempted utilization.

2) When done, search for what already exists.

3) Model the antennas found, then optimize them. I use for this the MMANA-GAL software (free) (download MMANA-GAL here). Chose the modelized antenna who gives your best expectations.

4) Build this antenna.

5) Install this antenna into a environnement witch is the most favourable to take your measurements.

5) Make your measurements with a correctly calibrated Vectorial Network Analyser - Look at the official site of NanoVNA (In addition, where possible, measurements will be made in the same conditons as those chosen for your modelling).

6) Compare your measurements with the results obtained by software modelling.

7) If needed, make physical correction to the antenna , re-modeli, re-measure until you're satisfied.

2 Phased Verticals Array 40m

Details: Hits: 22026

I build last week a Bazooka vertical for the 40m (see link here) with good results.

This inspired me to build a second one and implement a two phased vertical array system.

I have chosen for a Christman phasing system : simple and easy o build

ON8IM Christman

Yeasu FT-DX1200 and Panadapter

Details: Hits: 7897

I have added a IF PanAdapter output on my FTDX-1200. The IF frequency of the FTDX-1200 is 40.455 Mhz.

To tap the IF signal, I implemented a G4HUP PAT board (Panoramic Adaptor Tap Board) : the board is to buy at https://sdr-kits.net/Panoramic-Adaptor-Tap-Boards . The board type is the model PAT50M see the list here : It is better and safer to use a PAT board, direct tapping the IF offer no protection.

I ordered the PAT board here : https://sdr-kits.net/PAT-Board-50MHz

and the mounting cables and connectors here : https://sdr-kits.net/GSIK

1/4 Vertical bazooka antenna for the 40m

Details: Hits: 46256

I needed a omnidirectional antenna for the 40m.

Here is the schema of the antenna :

on8im vertical 40m

Equaliseur UR6QW 8 bandes et Icom IC-7300

Details: Hits: 8546

A partir d'un article de AD5GG

UR6QW
Je me suis récement procuré un equaliseur 8 bandes de UR6QW en Ukraine. Ce processeur audio de haute qualité est fabriqué par un radio-amateur et répond aux besoins spécifiques du hobby. Son prix (120$) est extrèmement compétitif par rapport à d'autres modèles sur le marché.