Excerpt from Website:
In this lesson, you will learn about the types of tactical antennas and their radiation patterns. In addition, you will learn about fabricating field expedient antennas using various repair techniques.
TERMINAL LEARNING OBJECTIVE
ACTION: Explain basic antenna theory.
CONDITION: Given this lesson.
REFERENCES: The material in this lesson was derived from FM 11-32, FM 11-64, FM 24-18, FM 24-19, and TC 24-24.
Tactical antennas are designed for efficiency and ease-of-use, and are ruggedized to take the abuse they receive in the field. Some antennas are easy to use, such as a whip antenna that is used in high mobility operations. Others, like directional antennas, require a working knowledge of antenna engineering. All antennas either release or capture electromagnetic radiation.”
This is a great video I came across. I think we’ve all been here at one point or another. Remember, you never know who is on the other end of the mic.
This is a great article I came accross written by K0NR, all the way back in 2003. This is something I have interest in and am definitely going to try.
Excerpt from the website:
FM is the most popular mode primarily due to the wide availability of FM repeaters. These repeaters extend the operating range on VHF and enable low power handheld transceivers to communicate over 100 miles. FM is also used on simplex to make contacts directly without repeaters. The main disadvantage of FM is relatively poor performance when signals are weak, which is where SSB really shines. A weak FM signal can disappear completely into the noise while a comparable SSB signal is still quite readable. How big of a difference does this really make? Perhaps 10 dB or more, which corresponds to one or two S-units. Put a different way, using SSB instead of FM can be equivalent to having a beam antenna with 10 dB of gain, just by changing modulation types. So this is a big deal and radio amateurs interested in serious VHF work have naturally chosen SSB as the preferred voice mode. (You will also hear them using Morse code or CW transmissions, which is even more efficient that SSB.)
Just as an example of what is possible on SSB, during one VHF contest I was operating portable on Garden of the Gods Road in Colorado Springs. I had just dismantled my 2M yagi antenna and was listening to 2M SSB on a short mobile whip antenna. Suddenly, I heard WA7KYM in Cheyenne, Wyoming calling CQ from about 160 miles away. I figured that with my puny little antenna and only 10 watts of power, there was no way he was going to hear me. But, what they heck, it was a contest and it would be more points so I gave him a call. To my surprise, WA7KYM heard me and we made the contact without much signal strength to spare. Now, to be accurate, this contact has more to do with WA7KYM’s “big gun” station (linear amplifier, low noise preamp and large antenna array) than it had to do with my 10 watts and a small whip. The key point here is that this contact would not have happened using FM and was only possible because of SSB.
Excerpt from website…
“SWR, or standing wave ratio, is one of the most misunderstood concepts in amateur radio. One of the reasons for this is that it’s so hard to visualize. I mean, you can’t actually see a standing wave on a piece of coax or ladder line.
Fortunately, mechanical waves work exactly the same as radio waves. That’s what makes this video, titled “Similarities of Wave Behavior,” such a treasure. Developed and narrated in 1959 by J.N. Shive of AT&T Bell Labs, this video uses a specially-developed machine to visually show how mechanical waves work, and because radio and optical waves work in exactly the same way, you’ll also learn how radio waves work.”
Really interesting read, especially for us hams that are also weather nuts! I plan on trying this expierment myself very soon.
Excerpt from the website:
“Most people are aware that every day weather satellites pass overhead to get a glimpse of the nation’s weather patterns. Many people, especially those outside the ham radio community, are unaware that the signals these NOAA weather satellites transmit are readily accessible with a minimum amount of equipment….”
“All you really need to receive the satellite’s signal is a radio receiver like an old police scanner (found at thrift stores) or a simple 2m ham radio handitalkie. An external antenna is usually better, but not a requirement for casual reception of the image. Other than the radio, the only other pieces are a computer with sound input and an audio cable (to get the audio out from the radio to the input on the computer)…”
” the NOAA 19 satellite transmits at 137.100 MHz, so it is vitally important that your radio be capable of tuning this frequency. It is also important that the radio selected for this project be capable of “Wide FM” and not the “Narrow FM” used for amateur and commercial radio services. APT Satellite signals are 34kHz wide, which is wider than the 6kHz and 15kHz of Narrow FM. Wide FM is most commonly used for FM Broadcast stations which are very wide at 230kHz. Ideally, the radio chosen will have the ability to filter somewhere in between these extremes – wider than Narrow but narrower than Wide…”
Check it out!
http://www.powerportstore.com/DisasterComBox.htm#FIRST RESPONSE with Solar -12
I found this site, which sells some really nice Emergency Communication Go-Boxes. I’m sure with a bit of research, someone could put their own kit together with similar items for quite a bit less money.
KL25Z Freedom Board Morse Code Translator in C++ – Use of an Arduino to make a Morse code translator – cool video check it out!
Just a quick update on a few things:
1. The next meeting is on Sept 3rd, at 7:00pm at Marcy Town Hall. This is an important meeting, since it’s the first meeting since spring. We hope to see everyone in attendance.
2. There will be a small presentation by N2TOB regarding the website, how to create an account and how to upload pictures to the website. We hope you can stick around for it.
3. The club has some upcoming events in the works that we’ll need volunteers for! These will be discussed at the meeting. Please let us know if you can help out.
Also if you have anything you’d like to see on the website, pictures, notices, birthdays, upcoming events, anything at all, please feel free to contact the webmaster at CNYARACLUB@GMAIL.COM – or get in touch with one of the board members of the club.
The After-dinner net, by decision of the club, have been suspended for the rest of the summer to give everyone time to get out and enjoy all summer in Central New York has to offer. You can always call out around 7pm weeknights and may find someone around, but we have nothing office scheduled, except for Mondays with the ARES net, and Fridays for the Swap Net.
Thanks and have a great summer!
KB3UXE – Toby
Our regular monthly club meetings, by decision of the club, have been suspended for the summer. Our next regular club meeting with be Sept 3rd, 2013. We hope to see you there!
KB3UXE – Toby