My HF Rig and Antenna

HF station overview
HF station overview.
My HF station consists of a HF transceiver which is connected to a horizontal wire loop antenna. The automatic ATU and the 1:4 balun performs impedance matching between the coax cable and the loop antenna.

Click the picture to enlarge.
Yaesu FT1000MP Mark V Fiels
Yaesu FT-1000MP Mark V Field.

HF transceiver
My HF transceiver is the Yaesu FT-1000MP Mark V Field multimode transceiver. Receiving range is 100 kHz - 30 MHz. Transmit range is all amateur bands from 160m to 10m. Maximum output power on all bands is 100 W. The transceiver is powered by the internal PSU, and the weight is 15 kg.

This transceiver offers a multitude of features like all-band all-mode operation, dual receivers (main and sub), digital read-out, dual VFOs, RIT/XIT, split mode, variable CW pitch, full break-in on CW, 4-step attenuator, IF notch filter, IF shift and width, AGC off/fast/slow, noise blanker, DSP filter, RF speech processor, monitoring of transmit signal on SSB/AFSK, VOX, and all-mode squelch. Furthermore, SSB-transmission in class A is possible, and IDBT aligns the DSP bandwidth to match the IF filter passband. The VRF (Variable RF front-end filter) serves as a preselector. There are selectable IF-filter options. There is room for 6 additional IF filters inside the transceiver. Computer aided tuning is also available via the RS-232 port, and ATU (Antenna Tuning Unit) is built in. 

Certainly, you can do without all these features, but they are worthwhile additions and will increase your operating pleasure! 

The RF output can be reduced to 5 W QRP using the RF PWR control.

Balun and automatic antenna tuner.
Balun and automatic antenna tuner.
An automatic antenna tuner (SG-239 from SGC) is housed inside a weather-proof plastic box and placed close to the feed-point of the loop antenna. DC power for the ATU is supplied via the coax cable. I use a bias-tee at the radio and at the ATU (not seen in the picture). The bias-tee injects/extracts 12 VDC from the coax cable.

A broadband balun (BL2 from Elecraft) is placed between the tuner and the antenna. It is housed inside a plastic box. The balanced side of the balun is connected to the loop antenna. The balun is wired for 1:4 where the low impedance side is connected to the antenna tuner, and the high impedance side is connected to the wire loop.    

When the operating frequency is changed (or when the antenna impedance changes due to weather conditions), the antenna tuner requires RF from the transceiver to align for best match and lowest SWR. A few seconds of RF carrier at 5 W is usually enough for this task.                 

Loop skywire antenna.
Loop skywire antenna.

My loop skywire antenna is 43 meters long and erected horizontally. The loop is supported in 4 corners and the feed-line is connected to one of them. The antenna resonates in the 40 meter band but is usable on the higher bands as well. The ATU provides impedance matching between the coax cable and the antenna.

The loop is made of 1 mm enameled copper wire. The 4 insulators are made of makrolon (high tech polycarbonate) and they are connected to the support points using black 1.5 mm Dyneema rope. Insulators and rope were purchased at


Latest revision: 25-April-2016 by OZ1BXM Lars Petersen.