Posts Tagged ‘SARC’
Five-band HF Linked Dipole [updated January 2025]
January 17th, 2025 | 
Author: An improved build
This antenna was first described in the November-December 2023 Communicator. After a year of using it, I’ve developed some improvements. - Updated January 2025
I appreciate inexpensive but effective antenna design. Sure, you can spend hundreds of dollars to buy a multiband antenna for POTA or GOTA but they are so simple to build, why would you want to? You can enhance your skills and communication capabilities by constructing custom antennas.
One popular and versatile option is the multi-band HF dipole antenna often called a segmented or linked dipole. This antenna design allows for effective communication across multiple HF bands by connecting or disconnecting sections along its length making it an inexpensive asset for ham radio operators, particularly outdoors enthusiasts and those needing a light, packable wire antenna that can be erected almost anywhere, and with good results—better than an end-fed, because each segment of the antenna is pre-tuned during construction, and can be used safely even when no antenna tuner is available.
Ideally it is hung from a pole or tree branch at 20 feet (6m) as an Inverted V, with the center point high and the dipole legs spread at least 110-120 degrees. I have worked the globe with this set-up on sideband and 20 Watts.
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| Oly one side of the dipole is shown |
~ John VE7TI
Manna80 and other Special Event Stations
You may wish to add these to your calendar
We will publish a report in The Communicator's next issue.
I would like to inform you about a few special event stations we will put up in the next few months.
February 14,15 and
16th, PA80OV will be operational from Gennep, Netherlands.
I will be a guest operator, and probably the organisation has written to you
allready, but it is nice to know.
https://radioclublimburg.nl/pa80ov/
----------------------------
The two others are also very interesting.
At the end of WW2, the Netherlands suffered a
hunger winter. Allied forces conducted a humanitarian action called Operation
Manna.
In April this year, 80 years ago, tons of food was dropped over the western
part of the Netherlands, saving many people from starvation and death.
To commemorate this event, we will activate a
couple of stations, including GB80MAN, VE80MAN, VK80MAN, PH80MAN.
We are hoping Poland is participating as well, and we hope the USA will put up
a station.
https://manna80.radio/the-team-in-the-netherlands/
As you have seen some SES from us, we will put
up PH80MAN at a former drop zone.
I have added a flyer with this mail. This one is in Dutch, but an English
version is under construction... will follow as soon as it is done!
Lastly, I would like to
inform you about PA82AD.
This is a call we used 5 years ago to celebrate 75 years of freedom. We held a
DX-pedition but due to COVID, we could not really complete our goals.
Please read the qrz.com page from bottom up.
To finish this DX-pedition as planned, we will
be operational for a very last time.
Thanks again for reading, and hope to hear you on the bands.
73,
~ Sander PD9HIX
A different kind of Foxhunt
Suitable for the urban fox
From the January-February 2025 SARC Communicator
The last few months, I've been thinking about a different way to do a Foxhunt. My vision was to have a Foxhunt available whenever you want, especially this time of year. Not everyone lives in town, and everyone's busy shopping and might not be able to dedicate an afternoon on a specific day for a group search. But what if the fox kept calling you out for a few minutes here and there, whenever you had a chance? No pressure, just try it out and see what you can find with your gear, experimenting with different antennas to get the best results. Go get that Fox!
Where to start with my build? You guessed it: Google and YouTube. The first step was to make a Fox using things I had in my toolbox. I got a Baofeng radio, Arduino UNO, batteries, a waterproof box, and a Drok buck converter. Simple enough, right?
I first searched using Miss Google and came across this: https://www.hackster.io/nfarrier/auto-keyer-for-radio-fox-hunting-e89b99 "Cool, I can do this," I thought, so I did. After putting it all together, I programmed the Arduino UNO using the Arduino software with the code from that website. I set up the CW message, and everything tested just fine. My vision was starting to come true!
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| My power supply was an 18 volt 5.0 Ah Lithium-Ion Battery (Makita BL1850b) feeding in the Drok Buck Converter to reduce the voltage to 7.4 Volt for the Radio and that voltage was also perfect to feed the Arduino Uno as it has a 12 volt connection with its own regulator to supply 5 volt to the board. |
I could hear it from the east and west side of town. All was good darn... a few days later I couldn't hear it anymore until I was right beside it. I took the Fox home and discovered the TX (transmit) wasn't putting out power anymore, even though the battery was still good. My Fox SX5 Mosfet transistor must have failed. It must have been spending too much time in TX mode. So, I replaced the radio and changed the transmit message, reducing the time by almost 50 percent.
There goes the fox hunt, second radio blown. How disappointed you all would be! I talked to a fellow ham about Baofeng radios. He uses them more often than me, and he showed me in the manual that the duty cycle is very small, 03/03/54 minutes (RX/TX/Standby). My fellow ham had a spare radio he wasn't using, so I bought it from him.
I did a few more programming changes to adjust the duty cycle. I also decided to add "MORE POWER!" (à la Tim Allen) So, I added a second Makita battery for a longer stay in the den.
I relocated the fox to be closer to home, just because I know I'll need to replace the batteries in a few days. For those of you in the area, I hope you all get a chance to find the Fox.
Happy Fox Hunting! 73,
~The Silver Fox VE3BQM
Hams meet Marines
A special event station from The Netherlands
This is an HF activity on January 23 from PA25MC, which will be on the air for just one day to introduce Marines to the world of ham radio. They will try to use as many HF-bands as possible on SSB. They remind us to please remember that Amateur procedures are new to them, but will do everything to get them up to speed quickly.
Marines are used to speaking English but naturally keep their communications short. The organizers would really appreciate it if you contribute to a successful event by connecting with them!
PA25MC is organized and supported by PI4VBD, the club station of the Royal Army. Their station will always comply with the user regulations and regulations for radio amateurs and has no military function.
QSL info for PZ5JT
The November – December 2024 SARC Communicator
The final issue of the year. The November-December Communicator, digital periodical of Surrey Amateur Radio Communications is now available for viewing or download. Some great projects and articles in this issue including a terrific Ham IV rotator upgrade, suggestions for affordable test instruments, and complete introduction to 3D printing, with special emphasis on amateur radio applications. Our regular columnists will also provide you with some interesting experiences.
Now read in over 165 countries, we bring you 125+ pages of Amateur Radio content from the Southwest corner of Canada and elsewhere. With less fluff and ads than other Amateur Radio publications, you will find Amateur Radio related articles, projects, profiles, news, tips and how-to's for all levels of the hobby.
Download the Nov-Dec 2024 Communicator
or read it on-line like a magazine
Previous Communicator issues:
Search for past Communicator issues
and a full searchable index is HERE.
As always, thank you to our contributors, and your feedback is always welcome.
The deadline for the next edition is December 15th.
If you have news or events from your club or photos, stories, projects or other items of interest from BC or elsewhere, please contact us at [email protected]
73,
John VE7TI
'The Communicator' Editor
The September – October SARC Communicator
We're back!
Read in over 150 countries, we bring you 125+ pages of Amateur Radio content from the Southwest corner of Canada and elsewhere. With less fluff and ads than other Amateur Radio publications, you will find Amateur Radio related articles, projects, profiles, news, tips and how-to's for all levels of the hobby.
You can view or download it as a .PDF file:
Previous Communicator issues:
Search for past Communicator issues
and a full index is HERE.
As always, thank you to our contributors, and your feedback is always welcome.
The deadline for the next edition is October 15th and we're especially looking for articles and stories about 3D printing for amateur radio.
If you have news or events from your club or photos, stories, projects or other items of interest from BC or elsewhere, please contact us at [email protected]
73,
John VE7TI
'The Communicator' Editor
The July-August 2024 SARC Communicator
Hello summer...
With another big Summer issue. The July-August 2024 Communicator, digital periodical of Surrey Amateur Radio Communications is now available for viewing or download.
Read in over 150 countries, we bring you 120+ pages of Amateur Radio content from the Southwest corner of Canada and elsewhere. With less fluff and ads than other Amateur Radio publications, you will find Amateur Radio related articles, projects, profiles, news, tips and how-to's for all levels of the hobby.
You can view or download it as a .PDF file:
Previous Communicator issues:
Search for past Communicator issues
and a full index is HERE.
As always, thank you to our contributors, and your feedback is always welcome.
The deadline for the next edition is August 15th.
If you have news or events from your club or photos, stories, projects or other items of interest from BC or elsewhere, please contact us at [email protected]
73,
John VE7TI
'The Communicator' Editor
