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Category: Amateur Radio

9V1KG – DU1KG – 4E1A

INFEX 2018 – DX1ACE

The 2018 International Friendship Exchange (INFEX) and DX Contest took place on Feb 17th, 2018. DX1ACE participated from the National High School Dasmariñas.

OCF dipole for 40, 20 and 15 m on a 12 m fiberglass pole and commercial v-shaped multi band dipole
girl_scouts
Girl scouts having fun with the radio
Dasmariñas National High School

80/40/30 m Dipole

For the lower bands I am using a 40/80 m trap dipole. In order to become qrv on 30 m, I added a radiation coupled lambda/2 element for 30 m, using 10 cm spreader. After cutting the additional wire to the right length, the resonance on 30 m is exactly at 10.1 MHz. The additional element has no influence on the resonance for 40 and 80 m, but the impedance on 30 m is with 150 Ohm significant higher than 50 Ohm.

VSWR_30m
10.1 MHz Impedance (141 – j34) Ohm – VSWR 3
40m_VSWR
7.1 MHz Impedance (40 + j1) Ohm – VSWR 1.24
80m_VSWR
3.6 MHz Impedance (27 – j5) Ohm – VSWR 1.9

Linear Loaded Dipole for 20 m

As the propagation conditions getting worse for 15 m and 17 m, I extended my linear loaded dipole on both sides by 1.8 m in order to cover the 20 m band. SWR is ok without modification of the 1 : 4 transformation line.

Will see, how it works in the upcoming CQWW DX CW contest.

CQ WW DX SSB contest 2017

My first participation in this contest. Would have preferred the CW part, but we will not be here end of November. Decided to enter the classic, non-assisted, single operator class for 20 m band only.

Propagation conditions were not bad. 77 DXCC entities, 31 CQ zones and 411 contacts result in a raw score of 121 thousand. Quite satisfied with the result!