Portable Antennas: The EARCHI End Fed

In the search for the “Wonder Antenna” that is small, portable and easy to setup, I’ve decided to build an Endfed antenna using a 9:1 match. This antenna has been made popular by the Emergency Amateur Radio Club of Hawaii (EARCHI). It consists of 30ft of wire fed into a 9:1 UnUn (Unbalanced to Unbalanced).

Plans for the Antenna are available from EARCHI’s website 

I’ve been wanting to make the antenna for quite a while but I’m lazy when it comes to ordering things online.  During the spring of 2013 I went to a regional hamfest located in New Hampshire hoping to find the T106-2 toroid that was called out for in the plans. I saw a bunch of red toroids and decided to purchase them hoping it was the correct mix and size.

I ended up with what appears to be a T130-2 toroid. It’s a little bit bigger than the T1o6 but uses the same mix.

The Build

It wasn’t that bad… If you follow the instructions the build only takes about 15 minutes or so. I mounted everything inside of a plastic tooling container. Instead of using a chassis mount SO-239 I went with a small length of RG-58 coax with a BNC at one end. The reason I did that was because there is always a strong chance that I’ll forget the coax and could at least use the pig tail connected to the radio.



The plan is to get this into even a smaller container.

Let’s hook it up to the Analyzer.

Before attaching it to my radio, I wanted to hook it up to the analyzer just to make sure I have the correct toroid being used. When it comes to buying toroids at hamfests, you could be taking a gamble unless it’s clearly marked. I might have purchased a different type even though it’s red in color.


What I’ve done is hooked up a bunch of resistors to the output and ground of the unit. The resistors should add up to 450ohms. Since it’s a 9:1 balun (or unun in the end use),  9 goes into 450 50 times which we should see 50ohms on the otherside if all is correct.


With the 450 ohm load. The analyzer is see approximately 50ohms across the HF bands allocated for Amateur Radio. However on 6M the SWR and impedance is quite high. However this is most ideal situation. That’s not going to happen when the wire is hooked up as it will not have a 450ohm resistance.

Here is a video I made testing the EARCHI with the MiniVNA PRO

What about the counterpoise or the other half of the antenna?

If you look at the design, you will see that the “ground” is hooked up to the shield of the coax, so it would be suggested that you run some length of coax between the match box and your radio.

Testing the antenna in the real world

One could sit there and talk all day about using the antenna. Let’s see what it can do

I tested this right outside on my deck using a 31 foot fiberglass pole.  The wire is 30ft of #18 Poly-stealth.
The antenna only took around a minute or two to raise. I wasn’t really planning on making a video or even using the antenna that day so the batteries on the KX3 were not charged nor did I have it hooked up to an external source. I was using 3watts to conserve battery.

I went onto 15m and within minutes I managed to make a DX contact with LY10NATO which is a special event station in Lithuania. Not bad considering my conditions. The bands must have been in good shape. I then went to 20 and made contact with W1AW/4, an ARRL Centennial station in Tennessee.

I know it’s not proper to judge an antenna based solely on contacts but it just proves  that it works. If you need a QRP antenna that is portable and can get you on the air quickly then I would suggest the EARCHI to anyone. It’s easy to build and if you don’t have the time you can purchase one from EARCHI. It’s not a “Wonder Antenna” by any means but it’s hard to beat consider the cost and ease of use. Also having a decent match (tuner) helps.

Edit (4/3/2014): Someone on Youtube asked about SWR reading with the EARCHI. I decided to hook up the antenna to the KX3 with the internal ATU option using a couple configurations and here are the results. Please keep in mind the ATU in the KX3 has a wide ratio and could match a lot of wire. Doesn’t make the antenna any more efficient but it makes it work.

KX3 With KXAT3, EARCHI Antenna with around 30ft of #18 Poly Stealth and around 20ft’ RG 58 coax

Band Ratio
160m 18:1
75M 1.1:1
40M 1.0:1
20M 1.1:1
17m 1.1:1
15m 1.1:1
12m 1.2:1
10m 1.0:1
6m 1.0:1

KX3 With KXAT3, EARCHI Antenna with around 30ft of #18 Poly Stealth and around 1ft’ RG 58 coax

Band Ratio
160m 17:1
75M 4:1
40M 3:1
20M 1.1:1
17m 1.0:1
15m 1.0:1
12m 1.0:1
10m 1.0:1
6m 1.1:1

You’ll see that adding a length of Coax will help you out in the lower frequencies. Please note that results will vary depending on your equipment.

Let’s hook up the analyzer using the EARCHI w/ approx 30ft of #18 wire and approx 20ft of RG58 Coax


Thanks for reading!


SOTA Activation – Jan 18th – Mt Tom (W1/MB-006)

It’s a new year! For those who are into activating summits, this means we can go back out and activate our easy and close-by summits that will count for points.  A known SOTA activator in the region (Doug, W1DMH) was going to be in the area activating a couple summits which caught the interest of a couple other hams in the area..  It was reported that it was going to be a rain/sleet/snow mix for the entire day so I was under the impression that I wasn’t going to be out. While out running errands, I’ve noticed it was clear enough so I ran home, got my gear and went to Mt. Tom.

It’s been awhile since I activated any kind of summit. I would also say it  was the last time I really ever “exercised”. The hike up was not easy. I had to stop a few times to catch my breath and I ended up taking baby steps to  the summit.

SOTA 1/18/14 - Mt Tom

Once I got to the top of the mountain, I was able to catch my breath but then I had to setup shop. Visibility at the summit was poor due to weather. Due to other activators in the area were already on the air, I had no time to walk around to see what was up.

Setting Up

After seeing a lot of activators using some sort of monopole to support their antenna, I jumped on  the band wagon and purchased a fiberglass kite pole during the holidays

Jack Kite Pole

I ended up going with the 31′ Jack Kite Pole.  I wouldn’t say that it’s the best choice for activities like SOTA. Soon as I got it out of the box, the threaded cap came off. It happened more than once which caused all the sections to fall out. I’ve also read reports of the top sections breaking under light loads. To be fair, it was designed to be use with kites. To combat the issues, I’ve removed the top two sections and made a sheath using left over outdoor canvas that I used for my Elk antenna. The sheath has a shoulder strap that allowed me to carry the pole w/o much issue.



Here is the kite pole with antenna mounted to the top.

In past activations that included the same exact spot, I’ve used a Mini G5RV by throwing rocks with a rope attached into the trees. The trees on some of these summits are not that tall and could only manage to get the antenna 6ft off the ground. It worked but I could have done better if it were higher. This time with the kite pole, things went much faster even though I had some issues  with getting the wire  snagged  in nearby tree branches.


I try to stay as minimal as possible. Even more so if  know the layout of the mountain/hill. What you see in the above photo is what I took up. I packed the KX3, microphone, battery, 90 degree BNC adapter, antenna, kitepole, mason line (rope), elastic cord, tape and 2m HT. Due to the massive amount of RF that is already present on top of the mountain, doing a VHF activation is out of the question. I’ve heard other people up there trying to do VHF and they always had trouble receiving.

Getting On The Air

Once the antenna is up, getting on the air is quite easy. However getting spotted or spotting yourself (which is allowed using SOTAwatch) could be difficult depending on conditions and which mode you’re using. I lucked out because I had cell service and was able to spot myself. Since this was last second, I didn’t have the time to give advanced warning of the activation.


A minute or so after spotting, my first call was from Doug (W1DMH) who was on another summit nearby. This counts as a Summit to Summit (S2S) contact that gives both doug and myself extra points. I was hoping to work Jim (KK1W) and Frandy (N1FJ as NE1SJ) that were also on nearby summits but I sort of arrived late to the game and missed out on 2 additional S2S.

After the first contact, the rest came in one after another with the occasional pileup. It was very exciting and made it worth the trip up. Talking on SSB with stations all around the US is fun when you’re using low power. I can see why people find QRP to be very rewarding. I also made some DX contacts with stations in Canada, England and my furthest contact with GI4OUL in N. Ireland. Approx 3000mi only using 7W (428mi per watt)  is not bad.

Thanks to the following who worked me.

Call Time Band Mode Notes
W1DMH 17:43 14MHz SSB Thanks For S2S
N4EX 17:44 14MHz SSB Thanks!
AE4FZ 17:44 14MHz SSB
VE1WT 17:45 14MHz SSB
AJ5C 17:45 14MHz SSB Thanks!
K0LAF 17:45 14MHz SSB
W0MNA 17:45 14MHz SSB
WG8Y 17:46 14MHz SSB
NS7P 17:46 14MHz SSB
KI4SUM 17:47 14MHz SSB
W7RV 17:48 14MHz SSB
W4DOW 17:48 14MHz SSB
NE4TN 17:49 14MHz SSB
WA4WKL 17:49 14MHz SSB
W4SKC 17:50 14MHz SSB
VA6FUN 17:52 14MHz SSB 2000mi on 10W TY!
AD5A 17:52 14MHz SSB Thanks for TX!
W5ODS 17:52 14MHz SSB
K4WAI 17:53 14MHz SSB
G4UXH 17:54 14MHz SSB Thanks for DX!
N6KZ 17:55 14MHz SSB
AA7DK 17:56 14MHz SSB
WB9EAO 17:57 14MHz SSB
K9ICP 17:58 14MHz SSB
GI4ONL 18:00 14MHz SSB Thanks for DX!
KC4TAC 18:00 14MHz SSB
W7RV 18:14 24MHz SSB
W1MSW 18:15 24MHz SSB

After doing a few summits, some of the callsigns start to become familiar as they chased me on other summits in the past. It’s nice to hear them and it makes it real easy to pick them out on packed/noisy bands.

Lessons Learned

Even though I’ve done over 6 summits alone, I’m still learning things along the way. For example, my logbook.



It’s an envelope… Not an logbook. It works but not well. I need some better way to log contacts w/o using some big and bulky notepad.
The G5RV needs to replaced with a SOTA version. Right now the current G5RV is using #14 electrical wire and the ladder line is solid core. It’s bulky and tangles to easily.  I would like to still use the G5RV as it works well but I would like to use polystealth wire and a ladder line made from stranded cable that was thinner.

Thanks for reading!

Elecraft KX3 – What Did I Just Do?

I’ll be honest and say that I laughed when I saw the Yaesu FT-817 for the first time when it was released in 2001. “You’re not going to make any contact with that! It’s small and only 5 watts! No one is going to hear you!” I recall saying a lot. I like to note that I was brand new to amateur radio and had no HF experience. I thought it was silly to “talk” around the world with the same amount of power that my handheld VHF puts out. Well… 12 years later and they are still being produced and sold. I’ve seen the error of my ways and accept that QRP (low power) contacts are very possible. Now that I’ve been involved with HF for about 4 years now, I can see how rewarding QRP contacts are. Now that  I’m more involved with SOTA (summits on the air), doing a bunch of VHF SOTA activations and watching my peers on HF, I decided to purchase a portable HF rig.

I ended up going with the Elecraft KX3.

I could have went with the much cheaper FT-817 and other QRP Xceivers but the features and technology of the KX3 far surpass what the FT-817 had to offer. Well… at least in writing. I just wanted something NEW for a change. Even though the KX3 is expensive, I cheaped out as much as possible and got the kit version of the KX3 with no options or extra accessories.



Hopefully the postal carrier didn’t notice me peeking through the windows with the excited look on my face as he approached.

There are already dozens, if not hundreds of videos, blogs, forum posts of assembling the KX3. I am not going to go into detail here. However I would like to share some notes and tips if you were to get the kit. Most are common sense.

  • Spend time and make sure every nut, screw, standoff and part is in the kit! Use muffin tins or a tackle box to keep parts separate.
  • Do not be surprised if your missing something. They include an extra parts bag and hopefully it’s in there.
  • Read the assembly manual entirely before starting. Do not jump ahead!
  • It’s not a contest, take your time and confirm each step


Besides a screw driver and other basic hand tools. I strongly suggest in using tweezers or a “Jewelers Pickup Tool”



This tool helped me out as the tiny 2-56 screws were  a wee bit hard to handle.

The only issues I had were installing the plastic battery holders (which is noted in the manual) and having to deal with missing 4-40 screws. luckily I had anodized screws in my personal extra screw bin. Overall the assembly went okay and it took about 2 hours.  Is it worth the extra $100 for an assembled kit? All depends on how you value your time. Think of it costing $50/hr for assembly. Are you worth more than that?

First thoughts


After turning it on, one of the first things I did was to compare the receivers of the KX3 to my FT-950 using a switch and the G5RV antenna. Since I don’t have any type of equipment that will give accurate readings, I am basing my findings from what I’ve seen and heard. On SSB, it seemed to receive similar with the DSP turned on in the 950 (No DNR). It has similar S-Unit readings. However the KX3 felt like it dealt with adjacent signals better than the 950. On CW, it seemed the KX3 was better at receiving.

Should Have Purchased Options

Like usual, I was being cheap and purchased the KX3 as a kit without any options. For some people that would work just fine. If you have a spare microphone and resonate antennas at the frequencies you want then you might not have a need for options like the ATU (Automatic Antenna Tuner) or microphone. But here I am with no microphones and no resonate antennas. I could have purchased an Emtech ZM2 or Hendricks SOTA tuner and a used microphone online that would have done just fine, but I didn’t want to lug around more equipment and didn’t want to modify the microphone. I ended up purchasing the ATU  and Microphone from elecraft a short time later.

Issues with the KX3

I’ve held off writing this article for a long time because I had issues with my KX3. After assembly and before installing the ATU, I was hot to trot. I went on the air, started sending out CW to see what skimmers (bots) were picking up my signal. I couldn’t transmit at full power. Even with the KX3 powered using an External 5amp supply, I could not get past 7W. When using batteries, I saw 3watts max.  Putting blame on my antenna at first I didn’t think much of it. At this point I decided it was best to order the ATU as I would end up using compromised antennas like an end fed or random wire where needing a “tuner” (match) would be important.  When I received and installed the ATU, I noticed that I couldn’t tune correctly and it was still folding back power. After taking it out on it’s first SOTA activation, I knew something was wrong.

Dealing with Elecraft

I knew it had to be fixed. The first stop was the Elecraft KX3 Yahoo Group to see if anyone else had similar issue. None were found so after following the advice on Elecraft’s website, as requested, I contacted them VIA e-mail.

I’ve heard that Elecraft support was AMAZING!!  However I felt the opposite. Just to get a reply from Elecraft took me well over a week. I ended up finding e-mail addresses to some of the staff/support members for Elecraft and after contacting them, my issue was finally looked at. It felt like I had to be pushy and demanding to get stuff done which is not a part of who I am so it was uncomfortable. However I just spent a lot of money, for some it may be nothing but it was a lot of saving on my part  so I felt cheated a bit even though Elecraft did absolutely nothing wrong.

Once the RMA process started, it was fast and easy. Elecraft sent me a confirmation once the item was received but I didn’t hear anything else until the day it was shipping out almost a week later. Since I’ve never dealt with returning a radio before, I felt that I had no idea what was going on or even if the radio has been touched by service. When Elecraft got back to me, it was shown that the PA Driver chips were replaced. I wished for a little more detail into what could possibly caused the replacement as to avoid it from happening again.

Months later and with very LITTLE use, the plastic knobs started to crack. After contacting Elecraft, they moved quick and got the replacements I need. Even though it appears this was a common issue, I was a little more impressed with their service this time around.

Amplifier over 2M module 

When the KX3  first rolled out, a 2M module was incorporated into the design but wasn’t available. Due to the fact that I enjoy doing SOTA on VHF, I was excited that there was going to be a 2M option at some point. That means less equipment that I’d have to carry and something better than the Chinese radios that I’ve been using.  However I was very disappointed when they decided to design an amplifier for a radio that was designed to be a QRP portable rig. I get why they did it. Not many people really care about QRP SSB on 2m or 2M in general when it comes to portable operations. They would rather have something that would allow for 100W while mobile or at the home while taking advantage of a really good receiver. It turns the KX3 into a dual purpose rig. I would have rather seen the 2M module first.

Even though at times, it may seem I’m very critical of  Elecraft, It’s because I want them to succeed.  They make good products, they’re very interactive with the community and they’re based in the United States. I just want them to improve so they can be on the same production level as the “Big Three”. I honestly think it’s possible.

Final Thoughts


Using the KX3 on top of Mt. Tom, Holyoke MA

When I decided to purchase the KX3, I thought I would be taking up adventures  like climbing mountains, hiking, going to parks and testing the limits of QRP. It  didn’t really happen. Those times I got to get out and played radio, the KX3 performed very well. The very low current draw allowed me to use full power (approx 10W) using a Hobby battery (Turnigy 2200mAh 3S 20C Li-Po 11.1v) that lasted for at least an hour before turning back the wattage (to 5W) when the battery voltage dipped below the 11vdc threshold (time will vary depending on duty, temp and mode).  The radio is easy to pack and deploy. If there are trees tall enough in the area, I can hang a dipole and get on the air within 10-15 minutes.

Even though there are cheaper alternatives, I think I’ve  made a wise choice. If I ever decide to go portable, It’s there  and ready to go and it just works.


SOTA Pack consisting of KX3, G5RV Jr and End Fed

I would recommend this radio to others under certain circumstances. If you’re just getting into the hobby, I wouldn’t suggest it unless you have the money for radio and amplifier or you live in a restricted area where a base antenna setup is just not possible and would have to go portable/mobile. QRP is a rewarding challenge but frustration will set in when your in a pile up with a 5W signal and a compromised antenna.

Hopefully the 2M module doesn’t cost as much as the K3’s module.

Thanks for reading!