HamSandwich

Your antenna is showing. Nice.

Study › General › G3B › G3B04

G3B04

RADIO WAVE PROPAGATION · - Maximum Usable Frequency; Lowest Usable Frequency; short path and long path propagation; determining propagation conditions; ionospheric refraction

G3B04G3B →

Which of the following is a way to determine current propagation on a desired band from your station?

  1. AUse a network of automated receiving stations on the internet to see where your transmissions are being received
  2. BCheck the A-index
  3. CSend a series of dots and listen for echoes
  4. DAll these choices are correct
Why Automated receiving networks such as the Reverse Beacon Network, PSK Reporter and WSPRnet post spots of signals they hear, along with frequency, time and signal strength. If you transmit a CW or digital signal and then look yourself up on one of those websites, you learn exactly which bands are open from your own station to which parts of the world right now. That is real, direct evidence of current propagation on your chosen band, not a forecast.
Watch out The A-index is a once-daily summary number describing geomagnetic disturbance over the previous 24 hours, so it is a general background indicator rather than a live band-by-band check, and listening for echoes of your own dots is an unreliable curiosity, not a practical test.
Skimmers and spotting networks show where YOU are heard; indices only hint at conditions.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
← G3B03 All of G3B G3B05 →

The rest of G3B

  1. G3B01 What is a characteristic of skywave signals arriving at your location by both short-path and long-path propag…
  2. G3B02 What factors affect the MUF?
  3. G3B03 Which frequency will have the least attenuation for long-distance skip propagation?
  4. G3B04 Which of the following is a way to determine current propagation on a desired band from your station?
  5. G3B05 How does the ionosphere affect radio waves with frequencies below the MUF and above the LUF?
  6. G3B06 What usually happens to radio waves with frequencies below the LUF?
  7. G3B07 What does LUF stand for?
  8. G3B08 What does MUF stand for?
  9. G3B09 What is the approximate maximum distance along the Earth's surface normally covered in one hop using the F2 r…
  10. G3B10 What is the approximate maximum distance along the Earth's surface normally covered in one hop using the E re…
  11. G3B11 What happens to HF propagation when the LUF exceeds the MUF?
  12. G3B12 Which of the following is typical of the lower HF frequencies during the summer?
BaoFeng BF-F8HP 8W Dual Band HandheldSponsored · View on Amazon →ARRL Ham Radio License ManualSponsored · View on Amazon →