These tests show that the signal strength of a local station can be many tens of decibels weaker than from a DX station.
For the last several years I have been operating WSPR from N6GN on the 600 m through 70 cm Amateur Radio bands. I’ve found the large number of geographically spaced participants combined with the round-the-clock worldwide reporting make the WSPRnet.org web page and database an excellent tool for investigating propagation, and also for measuring and analyzing Amateur Radio station performance. Among several local WSPR stations we noticed database entries that showed stations 1,000 to 2,000 miles away spotting our transmissions with significantly larger signal to noise ratio (SNR) than did local stations as close as four miles away. Assuming that the HF ionospheric propagation path follows an inverse-square law, one where the wave front expands spherically, it would seem at first glance that there should be a greater penalty for the greater distances. Distant signals (DX) should be much weaker than local signals. From previous propagation experiments at UHF I knew that foliage and slight terrain variations in the propagation path could be responsible for extremely large attenuation at shorter wavelengths. It’s also clear that HF antennas are usually closer to the ground, in terms of wavelength, than they are at UHF. Perhaps the peak of the main lobe of our HF antenna patterns getting pushed well above the horizon. This increases the signal incident on the ionosphere at the expense of signal levels measured at the….READ MORE .PDF FILE
More
The 10/15/20 Meter Trap Vertical Antenna
“This antenna project came out very nice. It’s a rugged homebrew multi-band trap vertical antenna that works the 10, 15, and 20 met... Read more
The repeter antenna of the ISS
The repeter antenna of the ISS Source: URE Read more
Building the 6 Meter Moxon Antenna
Building the 6 Meter Moxon Antenna As the late spring and summer months heat up, six meters comes alive. Known as the Magic Band, the six meter band c... Read more
RX ANTENNA MINIWHIP 100Khz- 30Mhz- HAMBUY
RX ANTENNA MINIWHIP MOVIL 100Khz- 30Mhz Price : 79,00 € More: Read more
JK402-PICCOLO 2 Elements on 40M / 18 Foot Boom
The JK402P (Piccolo) is a 18Ft boom 2 element 40m Yagi that has excellent gain and F/R. The elements are loaded Capacitively & Inductively which... Read more
Yagi Antenna GXP-7 (7 elements 5 bands)
Resonant frequency [Resonance frequency]: 28, 21, 14 MHz Frequency [Frequency]: 24, 18 MHz Logoperiodic Number of elements [Number of elements]... Read more
Momobeam MB9 12/17/30 Antenna for Warc Bands
New Momobeam MB9 12/17/30 antenna for warc bands without compromises. The MB9 12-17-30 is a big and solid fullsize antenna for the WARC bands o... Read more
Log Periodic Antennas – “ARRL The Doctor is In” podcast. Listen…and learn!
These directional antennas may look like Yagis, but they are quite different. The Doctor explains! Read more
![The New HRO in Milwaukee! [ Video Tour ]](https://qrznow.com/wp-content/uploads/2016/09/HRO-Milwaukee-Exterior-265x168.jpg)
