Sunspots and HF propagation

VAQP QSO Percentages

QSO data from a state QSO party reveal trends in HF usage correlating with sunspot numbers.

Ground effect

40m monopole over various ground conditions

Ground conductivity, permittivity and the effects on vertical monopoles.

Small Loop HF Antenna

With components from a variety of vendors, custom machining and a bit of trial and error, another variant of a small loop HF antenna is born.

KX4O 1B-Battery VA Field Day 2015

The 20m AHVD and 40m small loop antennas during KX4O 1B VA field day.

Despite a weak battery and few contacts, our 1B-Battery effort verifies a 40m small-loop and packet-radio NTS messaging using quick deploy antennas.

NVIS Gain of Loop and Dipole vs. Height

Observations from the Virginia QSO Party confirm simulation results concerning horizontal antennas and NVIS propagation.

SOTA HNY Activation

View of gear

KX4O/p Summits on the Air (SOTA) activation of Hawksbill Mountain (W4V/SH-001) on New Year’s Eve on 40, 20 and 10 meters.

40m Mastless NVIS Antenna

40m Mastless NVIS Antenna

Yet another 40m Cloud Burner design featuring a folded dipole driven element plus one reflector wire to facilitate 40m NVIS contacts without need of a tall mast. The design uses electric fence posts for support and needs no balun.

40m Loop Ground Wire Test

40m Loop Ground Wire Test

In the name of science I cut the wire laying on the ground underneath my 40m fullwave horizontal loop to see what would happen.

EFHW LNR Precision EF-10/20/40MKII Test Data

SWR Measurements of LNR Precision EF-10/20/40 End Fed Antenna

Basic tests of the LNR Precision EF-10/20/40 multi-band portable HF EFHW antenna including S11, SWR and a bandwidth check of the match box.

EFHW LNR Precision EF-10/20/40MKII Examination

EFHW LNR Precision EF-10/20/40MKII Examination

The background and details of the LNR (Par Electronics) EF-10/20/40 end fed half-wave multi-band portable HF antenna. Come see what’s inside the mysterious “black box.”