WWL New Orleans Finally Logged

November 25, 2009

WWL-870, New Orleans, LA (50KW) appeared this morning at 0455L (1155 UTC). The signal was weak with much phase distortion, however, it is now finally and positively logged! Received both on the Tecsun PL-600 barefoot and with the 24-inch loop.

A 24-Inch Box Loop On A Budget

Last week I completed construction of the 24-inch box loop. As previously described, the frame is composed of 1 x 2 inch furring strips, notched at their centers, and screwed together to form a cross. Length of each member is 33.9 inches (24 x 1.414). A 36 inch piece of 3/4 x 3/4 inch wood is screwed to one of the cross members to form a pivot, which will rest on the ground, elevating the loop to chair height.

Using a wood file, a wide, flat notch was cut at the end of each member to keep the coil turns in place. Sixteen turns (128 feet) of 20 gauge insulated wire was then close-wound on the frame, secured by small nails at each end.

Earlier this summer I rescued a small AM-band variable tuning capacitor from a very old transistor radio. It will serve as our tuning device. Using vinyl electrical tape, I taped this to the end of one of the cross members. These capacitors are actually two capacitors in one. In a superhet radio, one section tunes the signal and the other section tunes the superhet oscillator at 455 KHz higher than the signal, therefore this second section's capacitance is less, and not usually usable for tuning a wide range. We will use the section with the greater capacitance (the first section mentioned) to tune the loop.

Tuning range of the loop was found to be 530 KHz to about 1400 KHz. A short clip lead is used to short about five turns of the coil to allow tuning to the top (1710 KHz) of the band.


Turning the loop, signal peaking and nulling is fairly sharp. Signal strength increase over a barefoot radio is excellent and better than a 7-inch inductively coupled, tuned loopstick. Local electrical noise pickup is low, but the loop will transfer noise if pointed towards close noise sources. Atmospheric noise pickup is very low, and the signal-to-noise ratio seems markedly better than the tuned ferrite loopstick.

Performance. Inductively coupled to the Tecsun PL-600, signal strengths off the loop are equal to or greater than the 240 foot longwire attached to the Eton E1 last winter here at this location. 500+ mile mid-day DX is routine. KGO-810, San Francisco, CA, and KALL-700, N. Salt Lake City, UT are exceptional during the day using the loop, and are not receivable using the barefoot PL-600.

The 24-inch loop is a good compromise between a small loop and a large one. It is easily transportable. Try building one for yourself.

Fresh Japanese Catch This Morning

Nice signals out of Japan this morning at 0710L (1410 UTC). Caught both JOUB-774, Akita, and JOAK-594, NHK-Tokyo. Audio fair to good on JOUB, and fair to poor on JOAK. This is the first time I have heard readable audio out of JOAK. Both stations received with the Tecsun PL-600 barefoot. Tried to enhance the signals with the tunable loopstick, but no luck, the background noise came up right along with the signals.

Mid-Week Report

Started building a 24 inch box loop Monday. It is made from 1 x 2 inch furring strip, the cross notched at the center and screwed together. Left is to wind the wire and install the variable capacitor. Am planning to use a small transistor-radio variable cap, due to not having a standard sized one at the moment, though not sure if it will work yet.

Checked for JOUB-774, Akita, Japan three times this week. It has not been in at a strength where audio is recoverable, just a carrier present. Carrier is present on 594 KHz, presumably another Japanese station. The Tecsun PL-600 makes tuning for carriers very easy in SSB mode with the nice BFO knob.

Just at sunrise this morning I caught both KKOH-780, Reno, NV (50KW) and KAZM-780, Sedona, AZ, playing tag with each other for superiority. Not sure of KAZM's power at that time as it was just minutes before sunrise. It runs 250W nighttime and 5KW daytime. WBBM-780, Chicago, IL, was long gone by that time of course.

Strung 180 feet of wire across the property early in the week. Unfortunately, I am right near a power line and the noise on the BCB band is rather objectionable. I think I'll give up on the long wire this winter since I'm in town and go strictly with the loops and tunable loopsticks.