70cm 4 element yagi

One of my Facebook memories today was this photo of my 4 element yagi made from a metal coat hanger. It was used out portable in a contest. 

The mast was a PVC pipe trapped in the car door. 

See https://sites.google.com/view/g3xbm4/home/antennas/70cm-4el-yagi .

70cm 4el yagi on website

Last evening I had to use my homebrew 4el 70cm yagi in the activity contest. This was mounted on a PVC "mast" in the shack and turned by hand.

Even with this "Heath-Robinson" antenna and 10W, I was able to make over 100km QSOs on SSB.

See https://sites.google.com/view/g3xbm4/home/antennas/70cm-4el-yagi .

4el 70cm yagi

Tomorrow evening is the June leg of the RSGB's UKAC activity "contest" on 70cm.  

I usually use my 2m big-wheel omni, 10W, and stop on for less than an hour. Sadly, my 2m big-wheel has developed a high SWR, so tomorrow I will be using an old 4el homemade yagi indoors. It could be several dBs down. At least it can be hand-rotated from the operating position and the match is good. It will be interesting to see how I get on.

The last time it was used was early 2013.

70cm yagi

Unless I am mistaken the photo shows the homebrew 4 el yagi I made about 7 years ago for use in portable activity contests.

I still have this antenna in the back of the garage. It has not been used in recent years. The mast is just a PVC tube trapped in the car door.

4el 70cm yagi

Some years ago I hastily made this small yagi to use portable on 70cms. The pole is just cheap PVC pipe and the yagi made from old coat hangers. It worked well and I still have it, although it has not been used for some time.yagi,70cm

Simple yagi for wi-fi router

This was first seen some weeks ago and I saw it earlier today in an email from Twitter. It shows you how to make a simple add-on yagi for your wi-fi router.

In my case I get sufficient range with the router "as is". You might find it useful if you need to increase the range in a certain direction. It is a simple idea, which I like.

See https://hackaday.com/2017/01/24/a-simple-yagi-antenna-for-your-wi-fi-router/ .

Small 2m beam or a pair of stacked big wheels?

At the moment I am enjoying 2m and 70cm horizontal using a small yagi with 3 elements on 2m and 5 elements on 70cm. Both sets of elements are on the same boom and fed with a single 17m length of Westflex low-loss coax. Last Tuesday was the first chance to try the beam in a 2m contest. Although I have still to try the beam in a 70cm contest, I am wondering about 2 stacked big-wheels just for 2m.

A pair of big wheels are reported to have a horizontal gain of around 5dBd, which is comparable to the gain of my 3el beam, but without the necessity to rotate the antenna. In a 2m UKAC contest this arrangement may well be better? With the beam I was constantly wanting to adjust the beam direction. On my little halo (and big-wheel) I'd  have no choice.

For now, I shall stick with the dual-band beam, but I would be interested to hear your views on big wheels as gainy 2m horizontal antennas. I could probably mount the big-wheels slightly higher too.

Unlike many, I am not so keen that I want huge beams and high power. My interests are beacon hunting and casual contesting. In the last UKAC 2m contest I ran 5W.

2m/70cm yagi erection

Andrew G6ALB is erecting my new VHF/UHF yagi for me as my health is still too poor. He hopes to return later today. Andrew is hoping to fit a decent N connector to the failed Moonraker patch lead. With luck, the whole installation may be done this weekend depending on Andrew's time and the weather.

I am so grateful for Andrew's help - amateur radio spirit at its best.

2m/70cm antenna

Today I unpacked my 3/5el beam for 2/70cm, the wall brackets and the coax leads. I am missing a small SMA female to SMA female connector  (just ordered from eBay) to join the 20m long Westflex coax to the small patch lead to the FT817.

As far as I can tell, I have everything I now need, when the SMA connector comes. I shall have to wait until Andrew G6ALB can come over to help with the wall brackets. At the moment my health is still too poor (too giddy/clumsy)  to do the erection on my own, sadly.

Low cost rotator

In my search for a low cost rotator for small and lightweight VHF/UHF yagis I see that Conrad Electronics UK sells an "external TV rotator" for £52.99, plus postage from Germany with a free 2 year warranty.

3 core cable, 70 secs 360 deg rotation, 45kg load, 300Nm bending moment, 21.6Nm torque.  See eBay item 180832166179.

Does anyone have any experience of this rotator?

Nice antenna for 80m QRP?

This is most definitely NOT my idea of amateur radio, but you can't fail to be impressed at the dedication of this Russian amateur to put out a big signal on 3.5MHz. This is a full sized 3 element yagi for 80m, meaning the driven element must be about 40m long.