AB1WX Ryuji

@[email protected]
26 Followers
23 Following
94 Posts
Portable only, #sota and #pota. Interests: RF/analog engineering, neurophysiology, science/tech in general, culture, global issues and generally good life.
Modealmost exclusively CW, straight key
HomeFN42li
Show threadAB1WX RyujiDec 10
@jaseg Do you know what range of Q they get on FR4? I know it's dimension-, L- and freq dependent but want to get a rough idea of how it compares to air-core wound inductors (probably very unfair) and SMD components.
AB1WX RyujiDec 8
My SOTA focus is HF high bands, but I made a center-loaded extension to convert my standard high-band vertical monopole for 40m and 60m. It has a tapped loading coil and a bottom extension element. It works well enough for daytime low-band local/regional contacts with familiar OPs from W1/W2/W3/W4/VA2 that are otherwise well within my skip zones on high bands. Photos at W1/HA-023 Stinson Mtn on 6 Dec 2025.
Show threadAB1WX RyujiOct 8, 2024
@jeffpc I also have CS6 license but the MacOS version... I could use it on Mojave or High Sierra. but I need new camera support so I just use CC now.
Show threadAB1WX RyujiOct 7, 2024
@N4JAW That looks nice! I need to find one and try this winter.
Show threadAB1WX RyujiOct 7, 2024
@jeffpc (1) Lightroom makes preview images in local drive next to the SQLite catalog file, so access speed of the original copy (RAW files) is not that critical. You probably knew that. (2) if you figure out how to run the current Photoshop CC and Lightroom Classic on any PC UNIX please let me know... can't wait to say goodbye to Apple.
Show threadAB1WX RyujiOct 7, 2024
@N4JAW That time of the year already? I haven't tried the open-finger gloves in winter SOTA. Is it worth trying?
Show threadAB1WX RyujiOct 6, 2024
@N4JAW Does your paddle malfunction without the ferrites?
Show threadAB1WX RyujiOct 1, 2024
@chrisfarnham SWR is merely a "measure of mismatch" re 50 ohm and it has nothing to do with the antenna performance. There are 50 ohm antennas that won't radiate well, and many antennas perform very well far away from 50 ohms. The next question is how you feed those non-50-ohm antennas most efficiently. You are a local, and I am happy to tell you more about it.
Show threadAB1WX RyujiOct 1, 2024
@chrisfarnham If your antenna analyzer can read complex impedance (R +/- jX) those numbers do tell the antenna's operation, if you measure right at the feedpoint (using a super short coax).
Show threadAB1WX RyujiOct 1, 2024
@chrisfarnham Are you reading SWR without a tuner? Those numbers don't mean anything. Also, you should specify the type and length of the coax used for the measurement, as well as between the antenna and the tuner in the actual operation. A coax is not an inert device.