Why do hams often conclude messages with "73"?
Oct 25, 2013 · "73" mapped to "best regards" or "my compliments" and was intended as a general valediction for transmitted messages. It is still used for that purpose today in morse code …
How to estimate a dipole feedpoint impedance?
An ideal dipole, at resonance, will have an impedance around 73 ohms. A folded dipole, around 280 ohms. How can I calculate the impedances when not at resonance? Let's assume I have …
What is the impedance of an end-fed half-wave antenna?
Theoretically, (73 + j42.5)Ω. When the dipole is too short, its reactance will be capacitive. When it's too long, inductive. Since the exactly half-wave dipole has a slightly inductive reactance, …
digital modes - How do you log (or not) "busted" FT8 QSOs?
Oct 24, 2021 · 73 Dave - K1DJE. Share. Improve this answer. Follow answered Oct 24, 2021 at 18:18. Dave Dave. 81 2 2 ...
Understanding how antenna mismatch can damage a transmitter
Nov 1, 2023 · Antenna impedance is largely due to radiation resistance: a center fed half wavelength dipole has a radiation resistance of about 73 ohms. Resistance due to heat loss is …
Why are contest signal reports always "59" or "599"?
Aug 31, 2020 · Manufacturers muddied the waters somewhat by putting S-meters in receivers, with S9 set as -73 dBm, which was reinforced by an IARU Region 1 technical …
CW: when I supposed to send "E E"? - Amateur Radio Stack …
Jan 8, 2020 · First, some history. As I understand it, the "dit-dit" (E E) comes from an old practice. There is a short tune in popular music that was often used to end a musical performance in a …
jargon - CB v Amateur Radio - Amateur Radio Stack Exchange
Aug 16, 2021 · None of the above. There are no "73 codes" like 10-codes, 73 is just 73. Yes, I know about the 92 code, but it's well and truly dead, with no survivors other than 73 and …
How to properly measure sensitivity of the receiver?
To reduce direct coupling between chassis (generator and DUT), I use a long antenna coax (10 to 20 meters or more), and put the RF source plus attenuators on the far side of the building, with …
procedure - CW contact content - Amateur Radio Stack Exchange
Jan 12, 2015 · AA1BBB DE YU1NKA R OK TNX DR BOB FER ALL BT WILL SEND QSLL VIA BURO BURO BT HPE TO CU AGN ES ALL BEST FER U ES UR FAMILY IN 2015 BT TNX …