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  • How often are we required to send our callsign?
    Amateurs on the radio and online tell us we MUST ID at the start of our transmissions A couple of hams on 75m sometimes take me to task for not saying my callsign right away 'The FCC says so'
  • 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, shortening it can eliminate the reactance The exact amount of shortening depends on the thickness of the wire 0 41λ sounds like a reasonable estimate
  • How does a mag mount antenna achieve a ground plane?
    Most mag mount antennas I've seen have rubber on the bottom I'm confused because everyone tells me that because a roof rack mounted antenna isn't directly connected to the metal of the car there is no ground plane, but then there wouldn't be for mag mounts either So does it have to actually be connected?
  • What are the relative bandwidths of the amateur bands?
    In Thailand where I live, the 160m band is 25kHz, the 80m band is 40kHz, the 40m band is 200kHz and the rest of the HF bands are 'normal' There is no 6m band Also - nobody mentioned the 4m band available in Europe, but there is mention of the 220Mhz band, available only in the US So yeah - band plans depend on IARU Region, and country (80m is NOT 'famously wide' in many places of the world
  • Whats an appropriate core material for a loopstick antenna?
    As one example, for suppression of energy occurring at HF frequencies, they recommend "mix 73", a combination of Nickel and Manganese which performs well at absorbing energy, up to about 50MHz as shown here: It's worth noting in this chart that the losses are much higher than the MF band material, but so is the permeability
  • What happens if a station did not submit a contest log?
    What is the result of a contest station not submitting a log for the contest? Are all the contacts nullified for the other stations that contacted him? Is it bad form for a non-participating stat
  • Dipole increased CM current using choke balun
    I've read that an inverted vee lowers the 73 ohm dipole impedance closer to the 50-ohm coax impedance but connecting a coax unbalances the antenna, so I wanted also to test using a current choke balun I studied How to determine number of turns for a 1:1 balun? Within that post, I found How to detect common-mode currents or “RF in the shack”?
  • How to estimate a dipole feedpoint impedance? - Amateur Radio Stack . . .
    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
  • How to connect a David Clark headset to a Yaesu FT-710
    I have a question that I need a person a lot smarter than me (l’m a retired Firefighter not an electronic engineer) I found an article on how to hook up a David Clark H3340 headset to a Yaesu FT-1
  • Can I listen to hams on a standard AM FM broadcast receiver?
    Using this site, I determined the operating range is: FM: 87 5 - 108 MHz, AM: 526 5 - 1606 5 KHz The closest ham bands are 144-148 MHz, 1800-2000 kHz Thus, it cannot receive ham bands without modification With modification, essentially you need to open the radio and re-tune it's frequency calibration There is a website that documents how to do this It is important that you have a non





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