- Lenovo T495 laptop
- 12aH DIY LiPoFe4 battery pack
| (Photo Courtesy: Ken Campbell AD2T) |
| (Photo Courtesy: Ken Campbell AD2T) |
| (Photo Courtesy: Ken Campbell AD2T) |
| (Photo Courtesy: Ken Campbell AD2T) |
There are lots of instructions and videos about the 2m tape measure beam available already. Here are some build ideas based on the different iterations I have built over the years which are originally based on Joe WB2HOL's version before he went SK.
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| Please visit: http://theleggios.net/wb2hol/projects/rdf/tape_bm.htm |
Mounting the directive and/or reflective elements
Rather than using small hose clamps to secure the elements to the boom, I originally used zip ties. This method worked well, but sometimes warped the elements at an angle. Using electrical tape works better, is easy to replace, cuts down on weight and improves the radiation pattern of the antenna.
| Using electrical tape is inexpensive, secure, neater and does not influence the antenna pattern like hose clamps do. (Photo Credit: Steve Bossert K2GOG) |
Boom Material
1/2 inch PVC T and crosses seem the best. A few antennae I made used 3/4 inch conduit and junctions to improve ruggedness, but 1/2 inch has proven just fine and weighs less. Only use PVC cement once you are happy with the construction to secure the junctions to the boom pieces.
Friction fit construction may fail at the worst possible time, so glue your junctions. The only real major benefit of 3/4 inch construction is that your elements can easily slide into them for storage or transport. This is still possible with 1/2 inch fittings but is a little too tight and the elements will take up more room during transport.
| Here is a 2 element version with the director and driven elements folded up. (Photo Credit: Steve K2GOG) |
Is a current balun necessary?
After making identical versions of 2 or 3 element antenna with or without the balun, I find the pattern of the antenna is more stable with the balun. Making sure the balun is close to the feed point is a really good idea.
I drill two pair of holes a few inches apart to form the balun and the feed point goes into the boom for a clean construction. Drilling the holes as far to the interior of the PVC cross is a good idea in order to leave room for folded element storage.
How to connect your radio to antenna?
I like making a neat looking antenna and I route the RG-58 through the boom and out the back end. You can make a long tail with a BNC male on the end to connect to your radio or via an SMA to BNC adapter. Here is what a 3 element version of the antenna looks like configured that way.
The other option is a little more technically challenging to describe where a female BNC is fitted on to the end of the boom instead. For the photo below, I also drilled a hole to secure a length of 550 paracord to act as a wrist strap of sorts.
Using a short jumper cable to connect to the radio is needed, but when traveling, not having a cable dangling is a nice benefit and does not offer that much signal loss or leakage if done nicely.
Make your boom grippy?
Self amalgamating insulation tape works great as a grip and it wont leave a sticky residue behind if you care to remove it later. This same tape is also great for protecting antenna connectors, so pick up a roll or two and I am sure you will find many uses for this stuff.
Measurements
Many articles like the WB2HOL article cover measurements and you can find what works best for you. The goal of this article was to focus on some construction improvements.
When tuning the antenna it is best to adjust the driven element for lowest SWR at your operating frequency first and then add your reflector or directors after. This should lower the SWR further.
You can squeeze the hair pin match element to get a better match and as long as you are using stiff wire, it will hold its shape. The hardware used in construction of these antenna do not noticeably affect the radiation pattern of the antenna.
If you plan to transmit with these antennae, please ensure you adjust for a good SWR to protect your radio transmit circuitry.
Using these antennae
The original use for this design was for radio direction finding, but both will also do just for for transmitting if you are interested in light weight directional antennae for use with summits on the air (SOTA) or other portable operating scenarios.
Remember, that there is a null in signal off the back of the antenna and to the sides. This will be helpful when finding hidden transmitters. The null is more pronounced with the 3 element version, but the 2 element design works great for other reasons.
If you are looking for a fun and inexpensive project you can build, please give these a try.
Hudson Valley Digital Network in conjunction with other area amateur radio clubs will continue to hold hidden transmitter hunts, so please check our activity calendar for upcoming events.
| Safety first. Be sure to protect the ends of your antenna elements with some electrical tape to prevent injury (Photo Credit: Steve Bossert K2GOG) |
Yesterday was the first annual Hudson River Radio Relay event. This year our fundraising theme was to support Bannerman's Castle Trust via GoFundMe and we managed to raise $1,418 in total with over $300 of that coming in the hours leading up to, during and just after the four hour event which took place from 1:00 PM to 5:00 PM Eastern US time on June 12th
While we await the final logs from all eight of our participating special event stations to get compiled and posted to the HudsonRiverRadioRelay.com website, an initial estimate from casual discussion with most all the participating locations sounds like we should end up around 500 to 600 total contacts as a collective group.
There are so many positive things that will get mentioned about this event that will get published in the coming days along with lots of pictures and videos, but here is a quick snap shot just based on who visited each special event web page as well as the QRZ.com page for each of our eight callsigns.
Both metrics were measured from between May 13th and June 13th at 10:00 AM EST.
Our three stations that were not aided by affiliation of the different "on the air" categories like islands, parks or summits such as N2H, N2S and N2V seem to have also been very popular too over the last 30 days of measurements and deserve a lot of credit also.
The three lowest elevation stations, some only a few feet above the river such as N2U, N2D and N2N are hidden gems that deserve much more attention considering how hard they worked and are all actually very rare locations that we need to help promote even more for next year.
Between these three stations, there was a brand new USIAP NY-073 on a US Army facility plus POTA K-2079, K-4582, K-5161, COTA K-00825 and the former home of the founder of Paramount Pictures.
What's Next?
Now that we have an official website visit metric posted just after the event, please go and learn more about each club and location they operated at during this special event by visiting HudsonRiverRadioRelay.com
More detailed articles from each station highlighting each sponsoring club and a list of total event contacts plus the winner of our Xiegu G90 package raffle will be coming soon, so please follow the HVDN blog for more details between now and ARRL Field Day which is just under two weeks away.
With nice weather finally returning, its time to take some green pictures of some outside operating compared to the last still frosty excursion with the Icom IC-705 promoting some upcoming combined IOTA, SOTA and POTA activity here in the Hudson Valley via the Hudson River Radio Relay event on June 12th.
After some portable antenna discussion with Nolan KE8JCT who will be a guest presenter on HVDN Live scheduled for May 17th at 8:00 PM Eastern US time, I was tempted to build an even lighter antenna out of some really nice yellow Teflon 24 gauge wire acquired from the local candy store known as P&T Surplus.
While Nolan will be talking about the recent USMA Balloon Sat in a few weeks time with us, he is also very interested in portable operations and CW QRP!
There is a growing number of portable focused operators in the Hudson Valley like myself, Nolan, Jonathan KC2BNW and a number of others interested in the convergence of radio and the outdoors.
With a freshly mowed and goose poop free lawn for the moment at casa de K2GOG, I set up my just constructed "Lazy Linked Inverted L" to see how well it would work on 17m. I needed a back up antenna for my pack and this seemed like a good idea.
This antenna which is supported by the 20ft version Jackite pole in orange is supported by a simple $4.99 Tiki Torch stake at the bottom with a piece of PVC that the pole slides over.
Dimensions for the simple 52 foot long chunk of yellow wire is as follows:
The SWR was about 3:1 on 17m, but the magical ZM-2 antenna tuner got things quickly under control at 1.2:1 to help maximize my 5 watts of RF outwards on 18.1575 MHz. The "long" end of the antenna not visible in the picture was tossed into a nearby tree.
Admittedly, my first contact with this antenna had a much better station down in Texas that probably helped a little, but a contact is still a contact. QSL? YES!
Tom K5VWZ has a world class station and was able to pick me up out of the noise as documented by the recording function on the IC-705.
I really like this feature and how flexible it is, but to get the file off the radio still means I have to remove the SD card from the radio which is sort of annoying so I could trim it and convert to an MP3 to share with y'all in this article.
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| Click to play K5VWZ & K2GOG QSO on May 1st 2021 |
17m is your next challenge
Be sure to keep an ear on 18157.5 kHz USB as it is known as the 17m HFPACK calling frequency where portable people like me are likely to pop up, but usually not from the backyard.
During the upcoming Hudson River Radio Relay event next month, expect to look for N2B located on Bannerman's Island (USIAP NY047) which has never been activated by radio before and also N2D, which will be operated by the United States Military Academy at West Point on Constitution Island that now has been awarded USIAP NY073 thanks to this event and its goals.
A few of the eight participating stations like N2B are also technically going to be part of Hudson Highlands State Park K-2079 which actually counts as separate parks such as K-5161 and which you will hear N2U operating on thanks to the PEARL club. The Orange County Amateur Radio Club operating as N2O from K-2010 and possibly K-2081.
There is much more happening too, so hopefully this article excites you about 17m and some MAJOR upcoming activity across the Hudson Valley.
Learn more about Hudson River Radio Relay - June 12th 2021 and help support Bannerman's Island too!
How do I want to use the Icom IC-705?
After acquiring this radio, I spent time getting familiar with its functions and watching what accessory purchases others were making.
Lessons learned as an early Yaesu FT-817 purchaser almost 20 years ago proved that spending more than that radio cost for addon's got quickly out of hand.
And, since the Yaesu FT-817 brand new back in the early 2000's was much less than the Icom IC-705 today, I wanted to go about things a bit smarter this time around.
My intended use cases for the Icom IC-705 are as follows:
Following that video where Jonathan showed us his gear in use, Steve took us on a tour of some of his kit. To go one better (maybe even three better), this latest TFSN episode goes into depth on every day carry and field pack organization.
Be sure to watch the first hour for things not related to amateur radio, but the below like will get you right to radio focused discussion if that is what your more interested in.
On the 8:00PM EST March 15th 2021 episode of HVDN:LIVE, we will take the Icom IC-9700 and IC-705 for a in depth conversational review thanks to Neil W2NDG as moderator with Jim WA2UMP and Steve K2GOG trying to defend reasons why to or not acquire either of these radios.
VHF/UHF is NOT just FM repeaters
This review is not going to be a product endorsement in any way, but it just so happens that both of these radios do not have any direct current production competition, so that is why we are stuck with making this an Icom focused discussion.
The goal will be to highlight all the interesting things you can do on VHF/UHF aside from only talk on repeaters.
Both the Icom IC-9700 and IC-705 will be in full view during the discussion to ensure we provide fact rather than fiction for both radios. It will be really fun!
Basic flow is going to be:
How to join HVDN:LIVE?
We are going to experiment and see how many people can join the live meeting and we will be using Jitsi instead of Zoom since HVDN supports and encourages open source projects.
If interested in attending on March 15th at 8:00 PM Eastern Time , please join using http://meet.jit.si/hvdn/livemarch15th2021 and use the password "hvdnlive"
This event will be recorded for later playback, but anything live is always better than a recording, so be sure to check it out and get your questions ready for Neil, Steve & Jim!
Feel free to drop some questions below in advance!
Live from high on top of Sam's Point (W2/GC-020) were brothers Jonathan Gong KC2BNW and Michael Gong KC2BNX at the 35:00 minute video mark of this great interview focused on how to integrate amateur radio into outdoor activities or find ways to take your "ham radio hobby" with you as part of "Summits On The Air" or SOTA for short.
Steve Bossert K2GOG shares some background about radios that might be good for "prepper" or other emergency communications for the first show segment and then Jonathan shows them in real life use.
Later on in the show, Carlton made Steve empty a few of his packs to talk about some of the non-ham radio things to consider when out in the field.
Major topics were staying hydrated, organized and illuminated along with communication tips. Not covered in this episode are details are anything related to staying warm.
Video below starts at about the 90 minute mark, so if you like what you hear, go ahead and jump backwards for the full video. Even a brief mention of BlackHat and #DEFCON as a way to tie together hiking, cyber security and ham radio come up via a special "Ham Village" Velcro patch courtesy of Joe Cupano NE2Z.
Please follow "The Farmacy Seeds Network" for future videos with Jonathan, Mike and Steve. You can even buy a really cool TFSN mug for home use to help support the channel.
There are only six present recognized islands in the Hudson River but many former islands that have been lost thanks to human based expansion.
Over the last 200 years, islands which were close to shore were reattached to the mainland by filling them in with construction debris or earth materials to help make room for rails, bridges and roads.
As of 2020, the remaining official six islands of the Hudson River are: