Monday, March 17, 2008

Russian DX Contest 2008

Over the weekend, participate in the Russian DX contest all band-phone.
I have been in this contest started from 2005 and have fun with it.
With the low solar activity, band condition was poor. My score not as good compare to last year.

Tuesday, March 11, 2008


With a simple trap dipole,which is only two meters high on the roof, I was lucky to catch TX5C on 40M at 1428z on 9 March. It is very difficult becasue of JA wall. I need to call almost for an hour to get it, new one for me on 40M.

I hope to have them in the log on 20M and 17M. Watch and wait for good propagation ...

Wednesday, March 5, 2008

Palestine E4/OM2DX

The QSL card arrived yesterday.

Band condition was poor lately, only worked them on 20M.

Tuesday, March 4, 2008

Porsche and Jade with RED PACKETS

As promised, Martin and Anni gave Porsche and Jade the "RED PACKETS" for the year of RAT. They like it very much but Jade walk away when taking photos !

Monday, March 3, 2008

Six Meter SB-220 Rebuild

Steve, VR2XMQ gave me the SB-220 when the time he moved QTH. The amplifier was modified to six meter by one of the ham in the United States. However, the amplifier experienced with problem since it arrived. In the first instance, the HV meter was damaged in shipping and flash over when switch on, which finally proved one of the 3-500z have problem. The outlook of the amplifier was bad, most of the screws are rusted and internal wiring is in a mess, overall it is not a professional workmanship.
The amplifier was sit there for sometime and few weeks ago, I decided to re-build the amplifier and make it ready for cycle 24 for some DX in the magic band.
Here below are the major improvements:
1) repainted the power and filament transformer and inside chassis
2) replace most of the rusted screws
3) replaced all eight HV filter capacitors to 270uf 450V 105 degree C
4) replace the HV rectifier board completed with eight 1N4007, which used as the 5.1V bias zener diode
5) replace two panel meters
6) replace the load capacitor
7) add soft-start and soft-key
8) replace the burnt safety choke (8 mm Teflon rod with approx. 60 turn of SWG 22 wire.)
9) replace one 3-500z
10) refine the input SWR
11) tidy up all internal wiring

With AC mains supply at 207V, it gave out 900W with 100W drive. It can be more if AC voltage up a little bit. Now it is a 100 percent working amplifier and ready to go.

WPX Phone Contest 2007

Another achievement for WPX Phone contest 2007. I am very surprised to be no.1 in Asia for 21 MHz . I will participate in this year contest again, still not decide which band to go, may be 14 MHz?