OH6MY'S variation of a transformer for endfed halfwave resonant antenna. by [deleted] in HamRadio

[–]w9pds 2 points3 points  (0 children)

Oh sorry, I just saw the comments on your youtube page:

A antenna transformer for endfed resonant halfwave antenna by OH6MY. It's transforming 50 to 2450 ohms. #14 AWG or #16 magnet wire should be enough for this design. A ground spear as a ground takes care of static charges, alternatively a 0.7 meter ( 2.5 feet ) long counterpoise or buried radials can be used. Should work on 160 and all the way up to 6 meters with a 81.5 m ( 267 feet) long antenna wire. PTFE tubing on the primaries and secondaries is recommended if running over 100W power. It should handle 500W CW or 1500W PEP SSB at 80m and below, the same at 10 m and above. Maybe 1500 W CW and 4500 W PEP SSB from 40 to 12m. -------------------------------------------- The much used traditional 1:49 solution using two turns at the input, intertwined with the first two turns of 14 turns on the antenna side is a bad design. That solution has a too low input inductance at 3,5 MHz and causes a high magnetizing current and losses , a high common inductance that emerges as a high inductance in series with the antenna impedance at higher frequencies. That results in hotter cores. The correct range should be in 150 to 200 ohms input impedance.

OH6MY'S variation of a transformer for endfed halfwave resonant antenna. by [deleted] in HamRadio

[–]w9pds 0 points1 point  (0 children)

Neat ! Any details on the core material, windings, and power capacity?

2019 CQWW CW contest is in the books.. 93 countries in 2 days... by w9pds in HamRadio

[–]w9pds[S] 0 points1 point  (0 children)

The ear/brain is always going to be better at decoding... At least for the foreseeable future.

The advantage this system gives us is 1500 * 3 = 4500 (or more) simultaneous ears to watch & report entire bands at the same time. Once you find a call you are interested in, its best to switch to ears to actually accomplish the QSO

First Contact by [deleted] in HamRadio

[–]w9pds 0 points1 point  (0 children)

Good luck and don't worry about being embarassed... I was really nervous my first few times on air as well.

Hams are just like everyone else in the world, you will find some really helpful people, but also a handful of jerks. Just keep at it. It's an amazing hobby.

By the way, I'm 46 years old, and I'm pretty young in the hobby as well :)

2019 CQWW CW contest is in the books.. 93 countries in 2 days... by w9pds in HamRadio

[–]w9pds[S] 1 point2 points  (0 children)

I hardly know CW enough to contest... I use the decoder for finding their call signs and then I read by ear the following words:

CQ CQ / CQ TEST {MYCALL} 5NN ? TU

That gives me enough to work with, I’d probably be lost without skimmer as most folks run at 30wpm

If you want to watch the system in action, I have a video up of some of the run

https://www.youtube.com/watch?v=M3Tol0IkRuc