Thursday, January 26, 2006

UHF Antenna for 9M2RKL

Our Central Region representative, 9W2XL - Bear
has highlighted that the UHF antenna on Bukit
Lanjan condition is not very good.

As such, we are appealing to any good samaritans
who would like to donate a new commercial
antenna for the UHF band, 430 to 440 Mhz, to be
used on Bukit Lanjan. This will further our very
good hobby of using Amateur radioin the Klang Valley.

The repaired UHF repeater is scheduled to be
reinstalled just after Chinese New Year.

Please leave your contact telephone numbers
in the comment field for us to arrange for
the collection of the "donation."


Tuesday, January 17, 2006

Homebrew GPS re-radiating antenna for portable units

Dear All,

Mini Power Supply homebrew for GPS receiver and Interface connector wiring for Garmin Etrax Legend.

Amateur Radio and Automatic Positioning Radio System (APRS) Setup

Portable Re-Radiating Antenna set (MCX) - package - Consists of GARTX + GAST3X Code:GART3X - $47.90 sold in Hong Kong.

Homebrew GPS re-radiating antenna for portable units!

I bought a Garmin Etrax Legend GPS hand held receiver last week from Singapore and was not too happy with the performance since it was not able to received the traking satellites properly since I placed the unit on my car dash board.

My next step is to homebrew an Active Re-Radiating Antenna for my hand held GPS receiver! By combining a homebrew PCB board GPS antenna at 1.5GHz with a simple Pre-Amp circuit and a induction loop coil placed just above the GPS receiving antenna will enable better reception of the GPS satellite.

Have anyone try this experiment before? Or anyone have used a commercial version and does it claimed to work? Any feedback is much appreciated!

I also learned how to upload free Malaysia Maps into my GPS receiver learn FREE from "GPS Maps of Malaysia & Singapore" and FREE World Maps for GPS and FREE tips on Uploading Maps into Garmin GPS unit



Rodney Yeo

P.S. -> Thanks to Tony Yap 9W2YAP, Mat 9W2TTT and others for the ideas and insperation!

Friday, January 13, 2006

ISS Contact from Malaysia

Following email received from 9W2QC

Sion Chow Q. C. (9W2QC)

Jan 11 (2 days ago)
First of all a very Happy New Year to all of you.
On the 9th of January 2006, at 0136 Hours Malaysian Standard Time or 1736 Hours UTC, I managed a QSO with William McArthur (KC5ACR) on board the International Space Station (ISS).
Please visit for more details.
I am also happy that this QSO has served three points:

1. That the 1st station he worked from Malaysia is a 9 WHISKEY station.
This shows that 9W are also capable of out of earth communications.

2. That the astronauts do not turn off the radio over Asia as claimed by some parties.

3. That the QRM over Asia is not as bad as claimed by some parties. Bill himself said that it is not as bad as over North Africa and Europe.

Thank You.
73,Sion Chow Q. C.,9W2QC.
Strong supporter of the abolishment of the Morse Code requirement to obtain a full license!!!Support NCI for the healthy future of ham radio !!! Join NCI @ "


Wednesday, January 04, 2006

Fancy making you own VHF Antenna?

VHF Direct Connect Beams

Here are some lengths and spacings for various direct connect beams. The layouts are straight forward and are illustrated below. Your SWR should be less than 1.3:1 with these designs.

The driven element is cut into two halves and insulated from the boom with nonmetalic material. Then the two wires of the coax are connected, one to each section of the driven element. You may drill small holes and use sheet metal screws to accomplish this.

The reflector, director 1, and director 2 can be attached directly to the boom by a variety of methods. There are some helpful hints for antenna construction on our antenna construction tips page.


2 Meter 4 element beam center frequency 146.52 MHz
using 1/2" diameter tubing

Reflector Element Length [38-1/8 "]

Driven Element [36 "]

Driven Element spacing from reflector [24-1/4 "]

Director 1 length [34-1/2 "]

Director 1 Element spacing from Reflector [49 "]

Director 2 length [34-3/8"]

Director 2 Element spacing from Reflector [71-1/2"]

Typical Gain 8.43 dbd F/B 13.32 db

For full details please goto: