Video review of the MFJ-929 Automatic Antenna Tuner. The MFJ-929 is an amateur radio automatic antenna tuner that is used to match an antenna or wire to your…
Video Rating: 4 / 5
This is a short demo of a M2 RC2800PX prop pitch controller.
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The digital version of the June issue of QST is now available to ARRL members. The digital edition includes many features not available in the print version, such as:
- Watch video overviews of the following shack accessories:
- ACOM 1500 HF and 6 meter amplifier.
- Elecraft KAT 500 automatic antenna tuner.
- Array Solutions AS-419 switched band-pass filters.
Every issue of QST is filled with the news…
American Radio Relay League | Ham Radio Association and Resources
Few weeks ago I made one antenna for portable based on Comet CHA-250 with broadband transformer described in Martin’s G8JNJ document. On the base of antenna is transformer made from four “TDK Ferrite core noise filters” and seven meters of 0.75mm2 isolated copper wire. This antenna is mounted on fishing rod 7m long with transformer mounted on third element (3m) and rest 4 meter of rod is used to make coil for 7 meter copper wire from transformer. So, first 3 meter is RG-58 cabel then transformer and then 4 m coil with wire antenna. Distance between turns in the coil are 20-25mm. Results are great for the purpose and sets very quickly and requires little space. It working from 80m-6m but it is the best from 40m-10m bands. Great thing with this antenna is that it don’t need antenna tuner !!! Our working condition for this video: Rig is Yaesu FT-897D with antenna tuner (tuner not used) We worked on 100W of power on vertical portable HF multi band antenna. Tom 9A5TOM Please watch second part: Portable HF multi band antenna – seting and using
Video Rating: 5 / 5
Video manual supplement to the LDG Electronics AT-100Pro automatic antenna tuner, Part 2
Video Rating: 5 / 5
This is version 2 of my demo for an arduino antenna tuner. In this version I swapped the coil with a new, somewhat larger one, which has an extra connection about halfway. Using a relay (controlled by the Arduino) the inductance can be switched between half and full. In each position, the capacitor makes a full sweep, while the Arduino monitors the reflection (watch the right meter in the back!). After this, it puts the inductor and capacitor in the position with the lowest SWR. This demo is quite slow, I experimented with different speeds and was able to let it tune within 2 seconds! Details, pictures, schema and code: ernest.utreg.net
Ok, this is just a concept, I just wanted to show how the Arduino could be useful for radio amateurs. The SWR meter (in the back) is hooked up to the Arduino, also a servo is attached which drives a capacitor. This capacitor forms a simple L-tuner, together with an inductor which you can’t see on this video. The Arduino does a full sweep on the capacitor while measuring the SWR. It stores the position with the lowest SWR and after the sweep it rotates the capacitor to that position. Mind the SWR meter (right needle) while the capacitor is rotating! Details, pictures, schema and code: ernest.utreg.net
www.hamradiofinds.com Here is a video showing the JW MIller AT-2500 HF Ham Radio Automatic Antenna Tuner..This tuner covers 80-10 meters & will handle 2Kw+ of power..It has one input & 5 outputs, including one long wire connection..It runs on 110VAC, but can be switched to run on 220VAC..The tank circuit is well constucted using heavy duty parts..This would make a great addition to any HF ham radio shack..Thanks for watching..73s, Mel, WA5UTK
Video Rating: 4 / 5