Category Archives for "Antennas"

Stacked Quads for 20-10 meters

There is a thread on the TowerTalk reflector about stacking quads. I have never heard of it being done, but one of the participants pointed us to DF3KV and his stacked quads for 20, 15, and 10 meters.

It is an impressive picture and gallery. You have to appreciate the effort it takes to get these 6-element quads up on the tower and then geared up to operate. Especially when you consider that the tower is not that tall.

Nice!

Scot, K9JY

Field Day Antennas — 5 Considerations

Buddipole w/ 20 Meter CoilsField Day brings forth a wide range of antennas used for the event. Clubs even have their own stock of antennas, hidden in local garages, to spring on participants if needed.

Whether it is beams and towers or stuff with wires, here are some Field Day considerations for antennas:

Easy Does It

Antennas have to be put up and taken down. Ham Radio rules apply here as well: everything will take twice as long as you think to put up and take down, so select something easier to do.

Lower is better

Field Day favors working stations close-in relative to the world. Verticals with low angles radiation won’t help you work as many people as you need to, so try horizontal antennas that are not too high up.

Monobanders help

Monoband antennas will give you better SWR across the band and will help reduce inter-station interference. Nothing like operating 20-meters on your triband yagi with the 15 and 10-meter stations chiming in as well.

Any tower must be well supported

Safety is a big deal here and people setting up antennas for an event are more likely to cut corners. Don’t do that; safety first.

Know your antenna supports

If you have a long wire or dipole or inverted vee…where will the ends be supported? The middle of a flat field doesn’t help you support dipole ends, so some other support structure will be needed. Pre-planning on the site will help.

What are your favorite Field Day antennas?

Scot, K9JY

HD-70 Tower Assembly Pictures

From AB7E off of a link from the TowerTalk reflector, a great look at how the HD-70 tower goes together and gets put in the air.

And six feet deep of cement is impressive!

Pictures on AB7E’s web site.

Scot, K9JY

K9JY Zero Five Vertical Project

On Tuesday (not today…) I intended on posting about my latest project: the zero-five vertical. In the “What’s This?” post, I showed a few unopened boxes that I had delivered, but haven’t said anything about it since then.

That’s because…the boxes are still unopened! With life and work and hobby, other priorities override the hobby.

However, I intend to get this vertical up and working over the course of the next week.

The Plan

The parts are all here from the various manufacturers. This includes the antenna, the radial plate, the balun, and the coax.

The hole is dug. Not to 36” deep, but close. I have a yard that made of rocks with some dirt around them. Makes for a difficult symmetrical hole to place in antennas.

The pipe to go into the hole is purchased, cut, and ready to be partially pounded in. Need to get it right, level and plumb.

The cement is purchased and waiting to be placed in the hole after the pipe is positioned.

Once the cement is in and the pipe is plumb, we wait for the cement to cure and then worry about the rest of the stuff.

So, we are beginning this project. More to come.

Scot, K9JY

SteppIR introduces "Dream Beam"

SteppIR is introducing the “the first (DB36) of a line of antennas that will cover 6M through 40M with good gain on all bands” at Visalia this weekend.

image

You can see quite a few pictures of the beam in the Holiday Inn parking lot from K6RIX. It is a very different looking beam antenna.

There is also a brief review from N9ADG, a beta tester of the beam. His review and pictures: SteppIR Dream Beam Prototype.

Right now it looks like delivery times of about eight weeks. You’ll need more than your tax return to buy it as well…

Scot, K9JY

Reversible Beverage Array by OH2BEN

Seventeen pages of how to build beverages — using the KISS method. Tom, OH2BEN, notes:

Because I am not an engineer or technically oriented person, this is also a learning process for me. I am good to solder PL259’s, but all electronic stuff is beyond my understanding. But I am learning. And I can assure you, that it takes a lot of time to understand all technical nuances and there are still a lot of things what I cannot understand. Therefore all notes are just how I understand it and in a KISS way. And therefore you cannot expect to see some nice or new ideas 🙂

This is my kind of article.

Check out Building a Reversible  Beverage Array.

Scot, K9JY

Thanks ARRL Contest Newsletter.

A new tower — not mine

N0HR Tower SystemI have long been remiss in not reporting on N0HR’s tower progress. I’ve been watching this fairly long process (for those who have not put up a tower, it takes much longer than you think) with great fascination. And, to be honest, a great amount of envy.

But, great pictures of the process and a ton of information about all of the other stuff that goes into putting up a tower and antennas.

Here are the links and a quick summary of the posts:

And this doesn’t represent the posts on lightning protection, grounding, selecting coax and all the other details about what is needed for a great tower installation.

And now you know why N0HR’s blog title is “Ham Radio — A contact sport.” Take a visit for some great information.

Scot, K9JY