• Category Archives: Antennas

The Go-Bag for ARES or Portable Work

This is what I use for my ARES and emergency communication drills as well as for portable work (hiking or backpacking). As you can see it’s a simple backpack that you can find in many sport goods store (for example Big 5). I found that this backpack is perfectly meets my requirements. So what is inside?
It’s simple set-up that allows me to work on HF and have everything that I need. Of course it also have an other supplies that you will need for emergency situation or hiking.
Let’s look closely:
– IC-703+ (10 Watts with antenna tuner). The great transceiver for portable use. High reliability, ability to work with many antennas, easy to use.
– 12 V 10A battery. I use a regular 12 V, 10A battery which cost around $15. The better solution would be a Poly-MH batteries. Light weight and high current.
– solar panel + charger. Well this is very useful. Can be used for your battery or ether for your cellphone or other equipment.
– 5 m antenna pole (fishing rod). Found on eBay. Very cheap and fiberglass. The great mast for your portable antennas.
– Inverted V 14 MHz/28 MHz antenna (transformer). This is the ultra light and portable antenna-transformer. In my version is 2-band Inverted V antenna.
– extras (GPS, flashlight, rope and etc). This is really up to you.

The total weight of this set-up about 18 pounds which is not bad at all. I personally prefer have some snacks and small emergency(survival) kit, medicines and water.
Performance are good, not great but definitely enough to provide a communication in case of emergency and operate from any places with.
Time to set everything up and get ready is very short and it’s about less than 10 minutes.
Of course it’s not a perfect set-up and other people would prefer have something else but the main idea was – use everything that you can find in your home (garage), low cost and efficient work.
I have done this many times and when you live in California you never know when the earthquake or different disaster will strike this land.
You have to be prepared all the time and personal safety is always first.
I’m a CERT (Community Emergency Respond Team) member, Police Department & Fire Authorities Volunteer, member of ARES so my responsibilities are expended.
I hope you’ll enjoy it.

Alex K6VHF

Portable 3 EL 70cm Band Yagi

Hello. I want to share one of my recent projects – 3 el yagi for 70 cm band. It’s very light, portable and great for backpacking or hiking.
I like hiking a lot so to have the necessary equipment is important. For HF bands I have IC-703+ and set of J-pole antennas.
Many HAMs use a small handled VHF/UHF radios but unfortunately the original antenna is very bad and not efficient. It cause bad communication or radio overheating.
I decided to make one antenna that I can handle and have with me every time when I hiking or backpacking.
The antenna should be:

  • – light
  • – small or foldable
  • – have a good performance

Finally I found a solution and made this antenna. It met all my criteria. I got a ultralight, foldable and portable pocket size antenna with decent performance.

Frequency: 436.00 – 445 MHz with SWR 1:1.5 – 1:1:1.5 and 1:1.1 on 440 MHz.

Gain: 7 dBd 

Weight : less than 12 oz

I used a material that had in my garage, there is nothing special or expensive. The boom is a simple fishing rod that I bought  on eBay for HF projects. The antenna elements made
from 1/8″ (3.18 mm) brass rod. You can find them from K&S Engineering store. Simply drill a two holes, one for reflector another for director. The driven element can be just zip tied to the boom.
The important step is tuning. At least you have find a position of driver element whenever you get a lowest SWR on central frequency (the antenna can be tuned ether for SSB or FM). Personally I use this particular antenna only for FM, repeaters and satellites. As you can see on photo, I’d attached my cheap chinese radio directly to the boom.

 

3 EL YAGI 70 CM BAND

3 EL YAGI 70 CM BAND

Download in high resolution here in PDF.

CQ WW RTTY Contest 2013

1111Hello everyone. Here is some photos from CQ WW RTTY Contest which is my of of favorite contests. In this year my contest position was in Los Angeles area near Granada Hills. The place is good and quite. I was surprised because the propagation was so amazing and really low noise level on top bands. Me and friend of mine Alex W6AWW we installed our portable antennas in the garden around the pool. All antennas except HEX Beam were designed by me and are home made. I hope many people know the J-Pole antennas but only some of them used or still using those antennas. Based on my experience these antennas are useful and have many benefits. I’ve been made 4 antennas for 4 bands (6m, 10m, 15m and 20m). All of those antennas were tested in real field conditions during contests and CQ WW RTTY is one of them. Check our photos. Thanks. Your comments are welcome!

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

Hex Beam Antenna Testing

Do you know the Hex Beam antenna? Did you used it?
If not check this out. We did.
More info about antenna you can find on HEX-BEAM website.

Me and friend of mine Vlad WY6DX went to Vlad W6BVB to test a HEX-BEAM antenna. Antenna visual looks good, tiny bag and all part are nicely organized.

Time to put all parts together.

Antenna is assembled for 6 m.

What about 20m band? Easy!

Now connect a QRP transceiver. Receiving was perfect!


A full size of 20 m band HEX-BEAM antenna.

HEX-BEAM antenna passed the test!

73,
Alex K6VHF