Install Free Gold Price Widget!
Install Free Gold Price Widget!
Install Free Gold Price Widget!
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- Why do hams often conclude messages with 73?
"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 transmissions and often makes its way into everyday correspondence among hams as a form of jargon
- 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 a span of 15M in my property where I can hang a dipole Ideally, and very roughly, a folded dipole would give me about 280 ohms impedance at 10MHz
- jargon - CB v Amateur Radio - Amateur Radio Stack Exchange
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 occasionally 88, so realistically speaking they stand on their own And 73 doesn't mean "end of transmission", it means "best wishes" or "warm regards" or just "have a great day!"
- Core mix preferences for a balun (or unun) vs a choke
Manganese-zinc (MnZn) available as Mix #31, #75 and #77 (and others) – work well for common mode chokes Nickel-Zinc (NiZn) available as Mix #43, #52, #61, (and others) – generally preferred material for baluns ununs Palomar Engineers uses mix 31, 43, 52, 61, 73, 75 and 77 for most applications from RFI EMI common mode suppression, multi
- How does one read a ferrite datasheet? - Amateur Radio Stack Exchange
Datasheets for ferrite materials are usually filled with incomprehensible graphs with greek letters For example, Fair-Rite's 73 material: What's a $\mu'_s$ and a $\mu''_s$? What do these numbers represent, and how can I use them in amateur radio? Do they allow me to predict inductance or losses of inductors made on cores of this material?
- Understanding how antenna mismatch can damage a transmitter
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 negligible, and I believe reactance negligible as well Let's say we have an oscillator consisting of a 1 MHz voltage source (30V RMS) in series with a 75 ohm resistor
- procedure - CW contact content - Amateur Radio Stack Exchange
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 FER QSO 73 SK AA1BBB DE YU1NKA CL Here again, we have R, to show that whole last relation came through
- digital modes - How do you log (or not) busted FT8 QSOs? - Amateur . . .
73 Dave - K1DJE Share Improve this answer Follow answered Oct 24, 2021 at 18:18 Dave Dave 81 2 2
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