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Showing posts with label Philippines. Show all posts
Showing posts with label Philippines. Show all posts

Monday, April 4, 2022

The Next Time You Hear Someone Complaining About Winding Toroids....


... send them this video. 

Lin is in Hong Kong. What a great job she does with very simple tools.  Notice how she casually mentions that for those parts that have been lost, she will make them herself.  Three cheers for Lin! 

This video reminded me of the people in Santo Domingo 25 years ago who rewound the transformers and RF chokes from my HT-37.  These parts still work.  

Chuck KF8TI recently told me that when he was a Peace Corps Volunteer in the Philippines (1965-1967) he visited a transformer re-winding shop there, seeing piles of insulation and wire on the floor.  Apparently business was good!  

Monday, May 18, 2020

Homebrew Az-El Satellite Antennas from the Philippines and Australia



https://nightskyinfocus.com/2020/05/18/diy-satellite-tracker/

DU1AU is way ahead of where I was when I was working with Low Earth Orbit satellites.   I just aimed the antenna about 45 degrees up from the horizon,  and spun it around with a TV rotator with me --not the computer -- as the controllers of the rotator.  In essence I did the AZ manually and completely ignored the EL.  This design moves the antenna in Azimuth and Elevation, and has the computer control the movements via an Arduino.  FB. 

DU1AU points to the work of VK3FOWL and VK3YSP.   Their site has very detailed info on how to build several versions of this kind of Az-El rotator: 

https://www.sarcnet.org/rotator-mk1.html

This Az-El project represents a great opportunity to move beyond hand-held satellite antennas,  and beyond my Az-only manual approach.   It also give us a way to bring some real homebrewing into a part of ham radio that has come to be dominated by commercial equipment. There are some Arduinos and some lines of code, some motors and some metal work.  Great stuff!   



Designer: Douglas Bowman | Dimodifikasi oleh Abdul Munir Original Posting Rounders 3 Column