Yagi Antenna Install – Part 2

On August 13, 2015, in Amateur Radio, My Technology, by wx4sno

The Diamond A144S10 with 11.6 dBi gain and the Rohn 9H50 guyed mast overlooking Copper Valley. The Rohn 10 meter tower is in the background; in comparison, the Diamond X50A omni antenna has only 4.5 dBi on 2 meters.

After receiving some additional coax and manufacturing a window feed-through panel, I finally got the new yagi antenna up and going. I must say WOW! What an improvement in reception. Having this thing hooked up to the RCA VH126N rotor, I am able to pickup repeaters that were impossible using my omni antenna. Here’s what all has happened since my last posting.

After letting the concrete cure about 10 days, I was anxious to get the mast installed and guyed. I had originally painted the mast to match my Rohn tower, but the paint was interfering with the mast sections as I was raising/lowering them, so I had to use a power washer and blast the paint off. Power washer did a great job at removing the paint and I went ahead and left the bottom section orange for visibility.

The hardest part of the job was guying the mast. I used masonry string to get approximate lengths stretched out from the mast to the three guy points. In the end, each guy wire worked, but hooking them all up and getting the right tension on the mast was a pain! Next time, I’ll look at getting another Rohn tower, hi!

The RCA rotor is something I picked up from Lowe’s. I actually bought a couple of them, enough for spare parts if needed in the future. I must say, the device works perfectly! There’s about 100 feet of coax and rotator wire between the QTH and the antenna, but I haven’t had any problems with the rotor locking up or anything yet (knock on wood).

Instead of running my coax and antenna lines through the crawlspace and up through the walls of the house, I decided to make a cable entrance panel going through the window beside my desk. The idea came from KB3QLK at http://www.hamuniverse.com/kb3qlkfeedthru.html. I plan on running window line for an HF antenna in the coming months, so I added this, plus a PL-259 bulkhead connector. I have to run to town to pickup some ground wire to ground everything, but it came out really nice…much better than I expected. The panel is made of PVC, so I don’t have to worry about it rotting or of any interference to RF.

Window feed-through on the workbench

The installed feed-through panel

All in all, I am very, very happy and pleased with the antenna. I haven’t made any contacts yet, but I’ve picked up stations on the 147.180 repeater on Brush Mountain that weren’t using the repeater at all! They were somewhere in West Virginia discussing the low temperature tonight of 47°! WOW…the signal faded but then the automatic repeater announcement sounded and came in at a good 5-9!

I’m excited to get on HF…that’s my next project. In the meantime, I may post some additional info about the new yagi setup. But wanted to post a quick update…All for now and 73 de WX4SNO.

Current VHF/UHF setup

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Diamond A144S10

Diamond A144S10 and RCA VH126 rotator

Finally got around to putting the 2m antenna together a couple days ago and today I went ahead and installed it on the RCA rotator I bought. It’s a basic rotator that I bought from Lowe’s and is supposed to support up to 20-25 pounds…I went ahead and bought two of them in case I need parts. The antenna is mounted on a 3-ft mast and I’m using Davis BuryFlex low-loss coax which will run down the length of the mast and grounded at the base prior to running down the hill to the house.

I went ahead and bought some outdoor splicing tape that is supposed to weatherproof the coax connections. I stretched and applied this to the antenna connection and then added two layers of liquid electrical tape. After that dried, I added a final layer of Super 33+ electrical tape, so this should really help to keep out moisture from the connection; I plan to do this on all my connections running to the house, and in the future, apply this method to all my other tower connections.

Splicing tape, followed by two applications of liquid electrical tape, and finally a layer of Super 33+

The only thing that worries me is how I had to run the coax along the antenna. The way the rotator is setup, I could only attach and point the antenna in this direction for it to be aligned with 0° North. Therefore, I had to run the coax along the antenna to the boom, and then under and between two sets of elements, then across the boom and down the mast. I’m hoping this doesn’t give me any problems with RX/TX. I’m thinking that since the coax is well-insulated, it shouldn’t be a problem, but we’ll see.

I’ve also been looking at HF transceivers and am thinking of buying the Icom IC-7200, and for starters, getting a G5RV from these guys here. I’ve got some really tall white oaks and hickories around the house for mounting…we’ll see…but will have to save up for that, HI! On top of that, I’ve been studying CW/morse code using the Koch method…hope to actually learn this on my own over the coming months!

All for now…
73 de WX4SNO

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After the success I’ve had with my Rohn 10 meter tower, I decided to go ahead and install another antenna up the hill, this time a yagi, or directional antenna. On my present 10 meter tower, I have a 2 m/70 cm omnidirectional antenna (shown here) which is fairly good at hitting most of the repeaters in this area. However, I cannot access the 146.895 Mhz repeater along I-77 on Big Walker Mountain west of here in Wythe County. I’d like to have the ability to contact this 2 meter system since it is linked with several other repeaters in southwest Virginia and northeast Tennessee.

The new antenna will be at approximately 2,510 feet in elevation on a mast that extends 10 meters (~34 feet). I went with the Rohn 9H50 which is UPS-shippable. I plan to use at least 4 guy wires per anchor and spaced every 120 degrees around the mast. The mast will set down into the ground approximately 1.5 feet with another foot or so of concrete extending above ground. I was able to get the guy wire and mast holes dug today and poured some concrete for the mast and two of the three guy wire supports.

Figure 1. Rohn 9H50 concrete base and temporary mast

240 pounds of concrete form the base for the mast. The 2.5″ pipe shown in Figure 1 is temporary; I installed it and poured the concrete around it. While the concrete is curing, especially for the first 6-8 hours, I’ll rotate the pipe and moved it very slightly to keep it from bonding to the concrete. Once the concrete dries overnight, I’ll remove the pipe and this will create a shaft that’s just the right size for the 9H50. This will drop the mast down into the ground over a foot and a half, which will bring the top sections within easier reach to install the antenna and making it easier when it comes to raising the mast.

Two guy anchors are 32 inches long buried in 28 inches of concrete, while the third anchor is 40 inches with over 36 inches in concrete (Tractor Supply only had two 32-in versions). Each of the anchor holes is tapered outward at the bottom, which should create a concrete block similar to the one show in Figure 2. This will hopefully aid in keeping the anchors in the ground.

Figure 2. Tapered concrete piers

Figure 3. Guy anchor before concrete

Figure 3 is a shot of one of the guy anchors before adding concrete to the hole. Once these harden, the concrete should be more than enough to support the mast; most likely the 1/8″ guy wires will snap before they have a chance to even nudge the concrete anchor blocks.

That’s what’s happening here in Snowville today…I’m hoping to work on assembling the antenna (a Diamond A144S10 with 10.6 dBi gain on 2 meters) tomorrow, as well as paint the mast to match the Rohn 25G tower I already have. I also need to add two additional bags of concrete to one of the guy anchors since I ran short on 80 lb bags. Should be a week or so before I install the mast and get things setup as I’d like to give the concrete a good amount of time to cure, I just don’t want to have to wait 28 days for full strength!

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Finally back online after 3 weeks

On November 30, 2013, in My Technology, by wx4sno

Latest view of the WX4SNO Communications Tower overlooking Copper Valley

Since we moved into the house on April 1st our internet service has been with Millenicom, a mobile broadband company based out of Washington-state.  The monthly cost was around $80 for unlimited use and our service was provided over the Sprint 3G network.  Sprint is notoriously unreliable here in Snowville and surrounding communities simply because Verizon has more towers and more of a footprint (and choke-hold) across this part of the Commonwealth.  However, I installed a directional yagi antenna to help boost the signal from one of the nearby Sprint towers down towards Christiansburg and this worked rather well.  We were pleased with the internet service…after all, we figured the choice was between dial-up, satellite, or mobile broadband.  With the horror stories I have heard about satellite (and since they have data caps), we had no choice but to go with a mobile broadband provider and thus we settled on Millenicom which had the best plan and price available.  The 3G service provided us with everything we needed.  Sarah could easily access Facebook and YouTube, I could continuously update my weather station data online, and we could both enjoy playing Battlefield 3 and CoD on the PS3 (without much lag surprisingly).  Here’s a typical speed test of the 3G service we had for 8 months:

Sprint 3G mobile broadband speed test

However, on October 30th Sprint decided against renewing their contract with Millenicom as a gateway provider, thus our service was terminated.  We were offered an alternative to switch to another company (Blue Mountain Internet or BMI) which offered the same exact service…so I initiated the transfer.  However, after waiting 3 weeks without internet service, I gave up on BMI since they couldn’t get their act together and activate my new aircard device.  Luckily Millenicom offers another mobile broadband plan, except it has a cap of 20 GB per month and runs on the Verizon 4G network.  I knew we could easily get signal on the Verizon network, but 20 GB a month was really going to limit what we could do on the internet.  Again, thinking it was the only option, I called up Millenicom and within 3 days I had a new device and was online again!  The service is great and much faster than 3G through Sprint…take a look:

Verizon 4G speed test

However, I simply couldn’t believe that I was having to pay nearly the same price ($69.99/mo.) for this as I was the unlimited plan.  The speed, while being much faster, simply meant we were going through the data at a faster rate and 20GB per month wasn’t going to get us anywhere…then I remembered NRV Unwired.

I first encountered NRV Unwired while I was an undergrad student at Tech and living at home with the parents.  Having dial-up internet, I needed something better for my studies and asked NRV Unwired to come out to my folks house to see if we could get service.  Unfortunately they couldn’t provide service because mom and dad’s house wasn’t within sight of any of the company’s wireless access points.  I muddled through and survived dial-up for more than eight years in both high school and college.

With the recent happenings here at our new place, I decided to give NRV Unwired a call to see if we could get signal here on Flinchum-Montgomery Mountain.  After all, we live in the second-highest elevation home in the county…surely we could be within sight of some of their internet towers.  I emailed them on Monday, November 18th and two technicians arrived the next day to survey our location.  Within minutes they were able to receive signal from a wireless access point located on the water tower behind the old Hill’s shopping center in Christiansburg and a second signal from another water tower down the road.  However, they weren’t pulling in the best signal from 13 miles away or the best speeds (3 Mbps down/1 Mbps up) and they decided to try for another wireless access point located across Route 8 from Sinkland Farms.  This access point provided better signal and was much closer in distance.  They told me to get back with them in a couple days and they’d review things with the company’s engineer.

The new 2.4 GHz yagi and webcam

The communications array including the new 2.4 GHz yagi and webcam

On Friday, November 22nd I got a call from NRV Unwired and they agreed to provide me with service and asked what day would be best for an install.  The following Monday was scheduled and they arrived on time and started getting things setup.  Since I have a 10 meter tower near the house, they installed the 2.4 GHz antenna atop it and ran the necessary ethernet cable into the house, through the crawlspace, and into my structured wiring distribution panel.   Here’s a video of the install:  http://youtu.be/odjRY5i0jNs It was the same two gentlemen who came out to do the site survey, and they were extremely pleasing to work with…they even installed a weather webcam up on the tower for me, which saved me from having to rent a lift myself.  It wasn’t long until they had everything installed and ready to go.  They ran several speed test, getting up to 10 Mbps down/3 Mbps up which was extremely pleasing.  However, at times there seemed to be some sort of interference causing the speeds to crash down to 2 Mbps down/0.5 Mbps up.  Thus, I opted to go for the 6 Mbps plan since they couldn’t guarantee the 10 Mbps deal.  The tech did set the cap at 8 Mbps down/2 Mbps up…which was more than fine with me.  They also provided me with my own static IP address for making FTP much easier.  I’m thinking the interference is either because of the large hickory tree in the line of sight of the antenna or some other phenomenon between me and the access point.  Apparently the best signal was with an access point located in a subdivision just off of Fairview Church Road and the intersection of Childress Road.  Here’s a recent speed test of the new service:

Speed test of NRV Unwired on 2.4 GHz

To put these speeds into comparison…here are some speed tests I took while at Ball State University in Indiana and from the office at Virginia Tech:

Speed test from Ball State Univ.

Speed test from Virginia Tech

While not as fast as university access, I’m looking forward to enjoying internet service with NRV Unwired for many years to come!  It’s more than adequate for our needs, plus their prices are very reasonable and cheaper than what I was paying.  For my BBB review of their service, click here.  I’ll also likely hold on to the Verizon 4G service for a while.  Since it’s a mobile hotspot device, I can take it anywhere I go…dad and mom’s computer is in need of some service updates anyhow.

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