ad: L-HROutlet
ad: l-rl
ad: l-gcopper
ad: Subscribe
ad: L-rfparts

Login is required for additional detail.

Email: Login required to view

Ham Member Lookups: 2241


I started out playing CB in the 1982-1984 in Indonesia, mostly playing in SSB. I was using Cobra GTL-148B, with only 12W of power in SSB. But I had a 5 element 11m Yagi, so that was good enough for me to make contact on 10m and 11m to operators around the world.

After 1984, I stopped playing radio, as I went to college in US. But my hobby became my study in university, learning about analog, digital and communication systems. After college, I have been working as engineer working on RF&uWave test equipment, point-to-multipoint radio, fiber optic transceivers, networking switches and routers, wireless semiconductors.

I became licensed in US in 2014, and got my extra license in May 2015. I am mostly doing CW in HF, 10, 20, 40m. I have a Yaesu FTDX1200, and BaoFeng UV-5B hand held dual band radio. For my Yaesu, I have a home made antenna tuner, and a 20m dipole above my tile roof, and nocturnal/stealth 40m/80m vertical antenna.

Below is picture of Carlsbad beach from Pacific Coast Highway 

Not really interested in contest, or getting awards, just having fun playing CW, learning about radio, antenna. I like CW the slow way, usually 10-14wpm is all I can do, but I am happy with that.

I like to exchange QSL cards, but nothing electronics.

I enjoyed making my own keys... this one below is the second one I built from brass block .. it is a little stiff but I like to use my whole fist to key.

Home made key #2

This other key is Ameco K-1 that I mounted on aluminum scrap block. I have been using this in the last week so I can qso at night without annoying the XYL too much.

Ameco K-1 mounted on scrapped aluminum block.











20m Stealth Dipole

Made out of 24 gauge galvanized wire. Center fed with 1:1 balun. End of wires tied to the chimneys. Insulators made of plexiglass from scrap material I found in trash. See if you can spot the dipole in the picture below...

40m/80m vertical antenna ....

Coil for extending 40m vertical antenna to cover 80m band. I found website for calculating loading coil inductance given the vertical antenna dimension, feed distance, etc... turns out I need something like 23uH... found another website to calculate the dimension for the coil. the coil is fabricated using wire gauge #12 (forgot the length, but believe it was more than 22' long), I think I have 21.5 turns .. the diameter is 120mm.. I used my kids lego strips as wire guides, tape the lego strips on cookie tin can, wound the wire .. and used hot glue to prevent slippings. After glue is set, I remove the coil from the the cookie tin can and mount on the post.

The antenna is secured to the wooden post by the 1/4" bolt. The coil is connected to the antenna using the round terminal ring. The coil is fed at the bottom. I have several ferrite beads on the coaxial cable to prevent common mode current.

For 40m operation, since the antenna is at resonant length, so I short the coil using the blue wire with banana clip on both ends. The red wire connect the aluminum plate to a copper ground rod about 2 feet below the plate. I have about 8-9 radials with various lengths and mostly stretching out north-south.. east-west directions are hard to lay out the ground radials .. but I have a few laid out.



















Picture below is the 1/4 wave 40m vertical made of 4 sections of aluminum tubes.. the largest tube diameter is 7/8" .. and smallest tube diameter is 1/4". The total length is 33' plus minus few inches. I usually put the antenna up after sun down, usually that takes 2-3 minutes.. and before I go to bed, I take it down.. sometimes I would leave the antenna so I can work DX stations in the early morning, and take it down before sun rise. In the beginning, it was a struggle to mount the antenna to the wooden post, as I have hold on the bottom 2-3 feet of the long antenna, and the top is wobling excessively, making it very hard to hold the antenna steady. After I put a bolt into the post, and drill out a hole on the end of the antenna, I can now lean the antenna side way where most of the length is resting on tree branches, and I put the bolt thru the hole, hand tighten the nut, and pivot the antenna up, tighten the copper clamp (clamp is about 2 feet above the bolt), and now I am ready to play.

7433775 Last modified: 2016-07-10 03:35:11, 6709 bytes

Login Required

Login is required for additional detail.

Apply for a new Vanity callsign...

You must be logged in to file a report on this page

Please login now...

Public Logbook data is temporarily not available for this user
ad: giga-db
Copyright © 2017 by QRZ.COM
Tue Sep 19 15:28:29 2017 UTC
CPU: 0.050 sec 63358 bytes mp