Tag Archives: antenna

10 Meter Dipole and learning

I had put up my 10 meter dipole when I set up my ICOM 740, and had it at 16.5′. I had used a way out of the house for the feedline that had me using a lot of coax. I had trouble with SWR, I could tune it out but I was not very efficient. I found another way to get my coax out to my antenna and it knocked off about 45′ of the feedline, yes 45 feet. I was able to raise the top of the dipole to 21.5′ and now now roughly 12′ to bottom of mast of feedline. I still have a little off balance inverted V with the higher side pointing west, but only a few degrees different than east side.

Right off the bat I found 1:1.2 swr on my radio without tuner and this was at about 65% of RF power. Very little done on antenna tuner now to get it at 1:1 and if I go full power I can still tune it down perfectly. Next week I will be building my 50 ohm dummy load, just waiting on some resistors and need to go out and get my paint can and some mineral oil.

I found a good deal on both the General and Extra ARRL books so I have been reading those. I have been reading one section in the General book and then part2 so to speak in the Extra book. I am starting to pass the practice test for general, still marginal but I am passing about 60% of the time. Another week or two and I will raise that average.

I have quite a few projects on deck:

  • Found some really nice surround speakers plus center speaker at Goodwill, Sony’s want to use them as externals for my HF rig.
  • Have a LM386 Audio chip I am thinking of building into a mono amp to feed the Sony speakers, maybe build a small Eq tone stack to use as listening filters.
  • Parts arriving for my homebuilt bench power supply will be here in a few days and time to get that project in a box.
  • Have some 300ohm twin lead and some really old plans for a doublet dipole fed with coax and an air choke.
  • Arduino parts arriving late in week and ready to start on my weather station project among others.

Until next time…



2 Meter Vertical Dipole with air choke

After gaining a few pieces of equipment at the hamfest I was eager to see about getting a more efficient setup on 2 meters. New amp and i had just finished reading “US Army RADIO WAVE PROPAGATION AND ANTENNAS” on my smartphone So I looked around the net for possible ideas and with what I had on hand I arrived at making a vertical dipole.

I started off with making a air choke in hopes of eliminating some of the static I get on 2meters.


I had a Monster, project box and a pill bottle, time to get busy.


I slotted the end of the box so I could slide in my l brackets I was going to use to bolt the copper tube to.



Used some stiff plastic as a stiffener and isolator

My pill bottle was about 1.5″ and I put on 6 winds of RG58U



All mounted in box, I mounted a pvc fitting to bottom so I could mount on my mast so the coax fed the center at a 90 degree angle. I will post pics of it mounted outside soon. The 7/8 copper pipe  kinda test the pvc and my heavy fishing line guy lines.


It tuned in 1.3:1 on 5 watts and a bit higher when i turn the amp on. I can hit many more repeaters and certainly hear a lot more. I forgot to mention I raised the antenna to 16′ in the air where my old one was only at 10′. I still have this annoying pulsing  static that I hear when listening to a few repeaters, I am still trying to pin down the cause of this.


I Like Blue

I didn’t really like the yellowish backlight on my VHF/UHF SWR Meter so I opened it up and grabbed a blue LED to replace it with. I added a small toggle switch as well so I can power the backlight off without having to unplug the power from the back.

It had 12volts already coming in from a power supply so I had to find the right resistor to use on the LED. It is a basic formula:

To calculate the resistor needed for a simple LED circuit, simply take the voltage drop away from the source voltage then use Ohm’s Law.

  • Es is the source voltage, measured in volts (V)
  • Eled is the voltage drop across the LED, measured in volts (V)
  • Iled is the current through the LED, measured in Amperes (Amps/A)
  • R is the resistance, measured in Ohms (Ω)

so..  R=(Es – Eled) / iled

If you don’t want to bother with that you can go HERE

I needed a 560 Ohm resistor to make my LED work on 12volts

I just like the blue backlight!


Wish I had a little smaller switch to use but it gets the job done.




I am hoping to find a decent deal on an Antenna Tuner there and other goodies! Be nice to win that raffle as well but it will all be fun going to my first Hamfest.



Well I got a gift in the mail from my Father-in-law an Arduino Starter kit!


Uno board, USB cable, Parts, book and a breadboard!!

I downloaded the IDE and started building and getting familiar with the c code.

Built through the book fast doing the basic projects that teach you the fundamentals and coding structure.

Digital Hour Glass:


Talking to the LCD display with the code:


One book is definitely on my list to buy “Ham Radio for Arduino and PICAXE”

I am addicted already, what a great little platform for electronic experiments. The internet is full of projects and resources More on Arduino later.


HF Radios

Looking around for a decent High Frequency Multiband transceiver isn’t an easy task if you are new to amatuer radio and a frugal shopper. I watched Craigslist and Ebay for a couple weeks before narrowing my options down.

I learned a few things along the way as well. One of the first radios I found was local on Craigslist and the add said it had 11 meters on it. I looked up the model a Yaesu FT-101E. According to the specs it had ability to listen to 11 meters but needed to be modified in order to transmit on 11meters. Now for those who don’t know 11meter is the CB radio band. Not a HAM band and what I learned in reading about radios that had been modified is that they are not FCC legal. This is an old tube radio and for some reason my romance with old radios of my youth drew me in to look at older radios first. Not the best idea. I emailed the guy and we talked back and forth until I asked if the 11meter mod had been installed to make it transmit, in this email I had happened to change my signature to include my callsign. No reply.

I wondered if my question and callsign made the communication stop. As I type this the radio is still listed on Craigslist for sale.

There are horror stories out there of so called modded radios that look like the work of a 3 year old with a soldering iron. I had to ask myself why I wanted an older radio like this, all tubes, no frequency counter, more likely to need work now or in the future. I am sure there are plenty of “boat anchors” making QSO’s daily but not the best idea for a guy starting out.

It appeared to me the best options for me based on reliability, ease of use(learning curve) and mostly price the 80-90’s solid state stuff was what I should be looking at. I checked out Kenwoods, Icoms etc. I had narrowed down to a couple on Ebay.  Had to look careful and really read descriptions so many “work great except on 40 and 80 meters”  Or ads that say “tested” but as you read on tested means they put power to it and the meter lights lit up.

Well to cut to the chase I found an ICOM IC-740 for a good price and took it.  It has the optional power supply in it, the FM, all the filters for cw and passband. even came with the stock Mic.


I picked up a 10meter Dipole from DR.Dipole as well.

I set it all up, put the center of my dipole 17.5′ in the air as an inverted V. Got inside and my swr was over 3:1 according to the radio. Whoa! this is no good, I am suspicious of my long run of RG58 making things whacky. I rolled the power back and was able to keep it around 2:1 at 45watts. I ran up to Radioshack the next day and grabbed their SWR meter to see how close it was to one on radio. It was fairly close so I called out on 28.400 and listened. Now I know it is a terrible time of year for 10 and 12meters but a guy has to try. I tuned and listened on 40/80 and 160 meters was able to pull in a few to listen to. Heard a lot of cw on 20 and 40 meters. But no QSO’s for me. I can see right off the need to learn morse code again.

I have not had a chance yet get the dipole down and do some trimming or repositioning, I have been looking at antenna tuners and I want my dipole as close as possible without a tuner but I can see life will go a lot more easy with one. I happen to get the MFJ catalog recently and I like a few of their tuners.

I have been reading up on Baluns and the use with tuners, not totally sure if I am going down the right road trying to use a tuner as opposed to directing my attention at the physical antenna. It is 10meter 1/2 wave Dipole and after measuring it seems as if it should work just fine. So I will be trying a different feedline f coax to see if it helps but I still want to get a tuner if not for this situation but for other antennas and the other bands.


First Radio

A couple days before I took my test I had also received my first radio. To start off I wanted to get on the 2Meter band being as I could talk phone right away with a Technician’s license and I would be more likely to make contacts on local repeaters than trying on 10meter sideband right off. I was skeptical at spending too much right away as I didn’t know enough about what was to be had out there without a further education.

So after reading quite a bit on forums and reviews I decide to give the very affordable BaoFeng UV5R+ a shot.

It is a tidy little Handheld with most the features you need or would want. Programmable via cable or keypad, scans frequencies or memory channels and even has a flashlight and a decent Fm broadcast radio.

I found the best price on Amazon  I picked up an programming cable, Mic and a TRAM model 1185 mobile dual band antenna for my Jeep. This is a lot of radio for 40 bucks is all I can say. 2Meters, 70CM bands. Can be used as police scanner, FMRS and MURS radio.

The stock software leaves a lot to be desired so I downloaded CHIRP and it works very well. I can load up repeaters from various sources and save the image of the radio etc. On my recent honeymoon through the Olympic Peninsula here in Washington State I was able to load up my radio with repeaters based on the counties I was going to be driving through.

I use this mostly at home with an outside antenna. Radioshack is among the many places you can get an adapter for this radio to connect to a PL-259. I built a couple different groundplane antennas that I have used to participate in a few local area Nets. I do have a little bit a trouble hitting all the repeaters which I thought was due to coax loss but a few tries in the car and just out in the yard with stock antenna I still feel a bit under powered.  I run into a lot of I can hear them but they can not hear me. I am keeping my eyes out for a mobile with a little more power or a linear amp.

I had picked up a Daiwa CN-103L SWR/Power meter from a friend and both of the antennas I have made tuned up nicely, so I will connect to the repeaters I can until I get a few more vhf/uhf watts under my belt.


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