I’m working on some significant upgrades to my ham radio station. I finally received a Mercury IIIs amplifier. I was on the waiting list for about a year. I also got a Palstar HF Auto tuner to handle the increased power from the amp. For outside the shack I also got a K4KIO Hexbeam antenna. The only problem is that I don’t have a tower for it yet. That will be next, and hopefully soon! I’ll make additional posts as I bring the new equipment online.
Last month, I was given the opportunity to participate in a 30-day test and review of the Bilal Isotron 40M antenna for the 100 Watts and a Wire podcast. The Isotron is a strange looking and compact antenna that has reviews with an overall rating of 4 stars on eham.net. After building and then testing the antenna for a month, I was invited to participate in the podcast along with two other hams to give our review of the antenna for the following criteria:
You can listen to the podcast here. In addition to the audio podcast, there are videos covering each of the review criteria on the 100 Watts and a Wire YouTube channel. (Each of the criteria listed above includes a link to the YouTube video for that topic.)
Assembling the Antenna
The antenna arrived in a sturdy box, and all of the parts were in good shape. The paper manual is adequate and includes diagrams that were helpful for assembly. It took me about an hour to put it together. Once assembled and tightened, it is a sturdy antenna. It’s worth reading the manual closely before attempting assembly, and again afterwards to understand the instructions for tuning the SWR.
Installing and Testing the Antenna
I installed the antenna on 28-foot heavy duty fiberglass telescoping mast from Max Gain Systems. The mast is located next to a long chain link fence, which may have interacted with the antenna and made tuning it a bit challenging initially. Once attached to the mast, I used a Comet antenna analyzer, and attempted to tune the antenna for the lower end of 40 meters for CW and digital modes. For my first test, with the antenna mast lowered, the SWR was just above 3:1. I believe that was partially due to close proximity of the metal fence. Also, the manual specifies that the antenna works best with a metal mast, likely to serve as a counterpoise. I attached about 25 feet of copper wire to the antenna ground as a counterpoise, and made some more tuning adjustments. After that, and when I raised the antenna to 25 feet, the SWR was down to 1.6:1. Close enough, since I have an antenna tuner in the shack.
I tested the antenna for 30 days using FT8, WSPR, CW and SSB. The first contact I made on FT8 was in Washington State… a very promising start! Using FT8, I was easily able to work stations all over North America, as well as some DX stations in Europe, Australia and Japan. I also tested the antenna using WSPR for 24 hours, and my signals were received across North America and in Europe. I used the antenna for all of my 40 meter phone and CW contacts during Winter Field Day, and I was able to make a lot of contacts across the U.S. and Canada. The antenna performs better than I expected it would. However, it is not a good for receiving when compared against my end-fed halfwave antenna. I made comparisons several days, and the wire antenna was always noticeably better for receiving.
1. It actually works! When I first looked at the antenna, I was skeptical. After testing it for 30 days, I realize there are some use cases where this antenna is a good choice.
2. This antenna would probably good for someone with HOA restrictions, as it is small enough to be hidden. However, keep in mind that my testing was with the antenna mounted at 25 feet and in the clear.
3. Because the antenna is compact and can be raised quickly, it would also be a good choice for portable operations or emergency communications.
1. The antenna is only for the 40 meter band. If you have space for several antennas, that’s probably not an issue.
2. The antenna can be somewhat finicky with SWR. It made several trips up and down a ladder, and lowered the mast a few times, to get it adjusted. I also had to retune the antenna after one particularly cold, windy, rainy day.
The antenna retails for $160. Would I have bought this antenna on my own? Probably not. During the podcast, each reviewer was asked to give a “signal report” between 55 and 59 as an overall rating of the antenna. My report was solidly in the middle with a 57. It is definitely strange looking, but the appearance and compact size belie an antenna that actually performs fairly well, as long as you don’t expect miracles. I will most likely take the antenna down from the mast to install an off-center-fed dipole, and see if one of my ham friends living in a HOA community would like to give the Isotron a try.
This was a great ham radio experience for me. I had a lot of fun building, testing and using the antenna. I also enjoyed being included on the 100 Watts and a Wire podcast, and Christian Cudnick, K0STH, is a great host.
This afternoon I installed a new antenna for 10 meters. The antenna is a HF-28 Rectangle from PAR Electronics. It’s light (2.5 lbs.) and compact (approximately 8′ X 4′). It was very easy to build and took me about a half hour following the included instructions. I have the antenna mounted on a Max-Gain Systems MK-6 fiberglass push-up mast. The SWR was near perfect right away, but there are instructions included to tune the antenna if necessary. According to the manufacturer, the antenna is not perfectly omni-directional, but it has a pattern that does not require a rotator.
The antenna seems to work very well. The conditions on 10 meters were not great today, but right away I was able to work several FT8 stations on the west coast and in South America. I can’t wait to see how it performs in good band conditions. Hopefully this antenna will help me finally work Alaska on 10 meters to finally complete a 5BWAS and get closer 10 DXCC for 10 meters!
My faithful old 2011 Tundra pickup truck, as great as it was, was starting to require frequent repairs. I got a great trade-in offer for it, so I got a new Dodge 1500 Crew Cab. A new truck means time to install a new radio! My good friends Rusty KG4HIR, Randall KN4FYG, and Steven KN4RVU offered their expertise, time and sweat to help me install the radio. They’ve all had experience with mobile radio installation, but this was my first time.
In my Tundra, I had an Icom ID-5100A, and I had a Kenwood TM-D170GA in my shack. It seemed like a no-brainer to mount the Kenwood radio in the new truck to take advantage of the APRS capabilities, which are not really needed in the shack. So, the ID-5100A from my old truck was moved into the shack, and the TM-D710GA was designated for the new truck.
Rusty gave me some good advice, which is to get used to the layout of the new truck before deciding how and where to mount the radio. I did not want to drill too many holes in the new truck, so I decided to go with a fender mount for the antenna. I got an antenna mount, specifically designed for the Ram 1500, from Valley Enterprises. The main unit of the radio is mounted with a bracket under a back seat. After some research, I chose a center dash mount from ProClips, and an extension plate with magnetic puck from Lido Radio for the head unit. The dash mount is very sturdy and well designed. The magnetic puck on the extension plate is very convenient for the microphone.
The install went very well. It was a hot and humid morning, but the awesome install crew got the job done in about 3 hours. All of the truck parts went back in place, with no extra or missing pieces, and the radio powered right up. The way everything is mounted makes it very easy to install a new radio, if that’s ever necessary.
The radio had previously been programmed for use in the shack, but we were able to verify that it was transmitting and receiving. Later, I reprogrammed the radio and adjusted all of the settings for mobile use. I also did some test drives to see how the radio performed with the local repeaters, and simplex with a few friends. It seems to perform as good as I would expect with a fender-mounted antenna. I also have it transmitting APRS beacons as N4MI-9.
I am very pleased with the radio and how it is installed! It’s great to be on the air again while I’m rolling.
From the time I became licensed, just a little over 5 years ago, I have been using a trusty Diamond X50A antenna mounted on one 5-foot galvanized steel mast on an eave mount, putting the antenna about 4 feet above the roofline. The apex of the roof is approximately 30 feet from the ground. This antenna has served me very well, and with it I could reliably hit most of the repeaters in the area, as well as work stations on simplex up to about 15 miles away. Last year, I added a Cushcraft AR-6 Ringo for 6 meters. When there is a 6M opening, this antenna works OK and I worked quite a few distant stations (see previous posts under the category 6 Meters). However, because of the vertical polarization, I had difficulty working some stations in nearby grids who have horizontally polarized antennas. Also, the Ringo would frequently detune for mysterious reasons. Even though it was mounted on a telescoping mast, it became tiresome to frequently lower and retune it.
When my friend Rusty inquired about renting a 50-foot articulating boom lift to do some antenna work at his house, I thought now might be a good time to upgrade both antennas. I got a Diamond X300A for 2M/70cm, and a M2 HO Loop for 6M. I also got some new 5-foot galvanized masts and 55-feet of new RG-213 coax. My ham friends came over this morning to remove the existing antennas and install the two new antennas. Special thanks to KG4HIR Rusty, KG4HIQ Earl, W4EFS Walter, and KK4ZHT Eric for working all day on this project in the heat and humidity! Eric and Walter did all of the work in the bucket, and Rusty and Earl did the majority of assembly and adjustment of the antennas on the ground.
For this installation, we used three sections of 5-foot galvanized mast (for a total of 15 feet). Approximately 2 feet of the first section sits below the roof apex in the bottom of the eave mount, so about 13 feet of mast is above the rooftop. The X300A, which is a 10-foot antenna, is mounted on top, and the 6M horizontal loop is mounted about 5 feet below that. We used the existing LMR400 coax for 2M/70cm, and the new RG-213 coax for 6M. We tested the SWR and impedance on both antennas on temporary masts at about 15 feet above ground, and both antennas had great readings as assembled – no need for adjustments. I thought we might have to adjust the 6M antenna once it was in place above the roof, but the SWR stayed about the same at 1.2:1.
With the lift bucket extended, Eric took some photos that give an “antenna-eye” view from the rooftop.
Since we already had the lift, I took advantage of the opportunity to place a couple of ropes and pulleys for future use. The first about 40-45 feet up in a hickory tree, and the other on an old utility pole beside the driveway.
We had to take a short break for rain and thunderstorms. (The new antennas survived their first thunderstorm.) Even though there were a few adjustments made along the way, overall the project went as planned and was successful. Unfortunately, we did not have the same luck earlier in the day at Rusty’s house, because we could not get the lift into a position where the bucket would reach his antenna mast. I sure wish that had gone better.
I have not yet had a chance to fully test the performance of the new antennas. The new 2M/70cm has higher gain and is mounted 10 feet higher than the previous antenna. The 6M HO Loop is very narrow-band, but the SWR is nearly perfect at 50.3 MHz, so it will be great for digital and CW work. I did tune to 50.313 MHz and could hear and decode lots of FT8 from stations participating in the ARRL June VHF Contest. I’ll make some additional posts with my observations about the performance as I operate more with these antennas.