Force 12 c3

Strike Force Classic 3-Band. Force 12, Inc. Box Bridgeport Phone: 1. Texas Email: force Thank you for selecting the Force 12 C-3 or C-3E antenna. The C-3E is the C-3 with an added 10 meter reflector. Developed by Force 12 to meet the need for a true high performance Yagi to cover the classic three bandsthe C-3 was introduced in It has since revolutionized multi-band Yagis and brings monoband performance.

There are no areas for high maintenance or potential loss, such as coils, traps and phasing systems. The antenna is strong, lightweight and computer designed not only for the basic electrical performance, but also computer designed for mechanical strength, durability and low profile.

This is the third generation design, featuring a 4 foot package for easy transport, quicker assembly and several available upgrades:. This gives. This can be specified. Assembly Instructions. Page 1. This manual is common to all C-3 and C-3E models. The differences are covered in the text and also in the drawings. Please match your antenna to the proper drawing and appropriate instructions.

Design of the Antenna. The C-3 is a multi-monoband Yagi antenna designed for direct operation in the 20, 15 and 10 meter amateur bands. It will also operate on the 17 and 12 meter bands with a VSWR that can be matched by the tuners in most rigs, or by an external tuner. The term, " C-3 " is from "Classic 3-Band", which means the antenna is designed for the bands classically, or traditionally, covered by a "triband" antenna.

These bands are the 20, 15 and 10 meter bands previously mentioned. The advent of the new 30, 17 and 12 meter bands authorized by W. There now can be several "tribanders" within this five band range, so this antenna is termed the Classic 3-Band, or " C-3 ". The design of the C-3 is a dramatic improvement in multi-band Yagi antennas over the typical methods used in past years and decades.

The usual methods of covering multiple bands utilize traps in the elements, log-periodic cells, dual phased drivers, parallel-feed drivers or various combinations of these methods. The primary shortcomings of these methods are losses in the traps, complex mechanical structures with log and phased elements and other compromises to provide a 50 ohm feedpoint impedance for the 50 ohm coax feed line. Several design features of the C-3 will be described in the following paragraph.

Knowing it is possible that not everyone who has acquired the C-3 is necessarily familiar with Yagi antennas, or beam-type directional antennas, it is suggested that a good book, such as the A.

force 12 c3

Antenna Book be utilized for further information. Of course, one can always proceed directly and assemble the C-3!QRZ Forums. Old Force 12 C3-SS? A local ham has one to sellhave not gone to look at yet. I did not see anything about adding bands? Hello John, Whether the older Force 12 antenna versus the Mosley TA33 might give better performance since all three bands are separate Yagis on the same boom for the Force 12 and the Mosley has the Traps to use multiple bands It is a decent tri-bander for its size.

You can use it on 12m and 17m but the gain is like a dipole. You will have to use an antenna tuner. And if you run 1. KF6ASep 6, DanJohn heredo or did you use a balun of some type with yours? I trying to find some details on the need of onekindimpedance etc. KF6ASep 8, Took a quick look at the link [ too many pages to read all just now ] looks good. Ya I try to make as much as possiblenot lucky enough to spend money to save timeI need to spend time to save money.

Force12 C3E HF Beam \u0026 Comet GP-3 Deployment for Ham Radio

Last edited: Sep 8, W9GBSep 8, You must log in or sign up to reply here. Show Ignored Content. Share This Page.

Your name or email address: Password: Forgot your password? Register for a free QRZ account.Forgot Password? As mentioned in a previous articlethe Force C-3S is a very robust Yagi and its design is ideal for extending coverage up to five bands by application of linear resonator techniques. One of the attractive design features is that the Force 12 antenna uses no traps, a buzz word for quite a while among serious DXers.

From a mechanical and RF point of view the manufacturers deserve a lot of applause. A few of us in this area have had our C-3S Yagis survive the regular strong and gusty storms that are typical of winters near the most southern tip of Africa. Now that solar cycle 24 is in sight, so they say, conditions on the higher bands will be picking up. This means it is time to look at the final step in making a Force 12, C-3S a true five band Yagi. After enjoying great results with the addition of 17 meters, the 12 meter modification is a logical next step in expanding the frequency range of this Yagi.

Taking a look at the C-3S and reading about the principles of operation, especially the driven element, it is clear that the Open Sleeve is a dedicated three band driver, which does not make any particular provision for 17 meters or 12 meters.

One can therefore appreciate that matching is quite poor on both these bands with one exception. Seventeen meters is close enough to 15 meters for built in automatic antenna tuners to keep rigs happy. For this reason the 17 meter modification described in the previous article did not involve any changes to the driven element. On 12 meters it is a different story all together and the mismatch is too much for an automatic antenna tuner to deal with.

When you listen to 12 meters it sounds as if the antenna is disconnected. Only a faint background crackle and hardly any signs of signals can be heard, except for the very strongest. The original configuration of a C-3S is shown in Figure 1, and after the 17 meter modification the antenna layout is shown in Figure 2. This is the starting point for adding the 12 meter band.

force 12 c3

From the beginning, the same goals were kept in mind as for the addition of the 17 meter band: The fifth band had to be added without cluttering the already quite busy boom. Since making the modifications I am about to describe, I have been getting good reports and enjoying a lot of success during 17 meter and 12 meter openings. More about on-the-air tests later. The solution for adding band five involved two steps. First, there had to be a 12 meter reflector and second, the matching had to be drastically improved.

Past experience made it a logical step to add a 12 meter linear resonator to the new 17 meter reflector to change it into a two band reflector.

Attaching the linear resonator is quite simple.

force 12 c3

A nice thing about it is that there is no need for drilling holes in the existing structure. It actually hangs on the element with two clamps and two acrylic hangers.

All this and the simplicity of the modification will become clear later. A linear resonator is an LC circuit consisting of a one-turn rectangular shaped coil, shown in the schematic diagram, Figure 3.

B-C-E-F is the inductor; resonated by the variable capacitor D. Half of the coil is shared by part of the element B-F. Due to this sharing, a second, higher resonant frequency is obtained over and above the natural resonance of the basic element, A-G.

Force 12 C3S Triband Antenna Manual

One limitation found was that the second resonance had to be at least 40 percent higher than the basic resonance of the element to which it is attached. This makes the 17 meter reflector ideally suited for a second resonance on 12 meters. Figure 4 is a photograph showing the main components of a linear resonator.

For the sake of illustration, it is shown attached to the 20 meter reflector. Note that the antenna is tilted so that the element runs parallel to the ground with the boom pointing up.Our house was completed during the summer of and costs associated with the construction were higher than expected I am sure this is standard with most home constructions. The tower was purchased in from a local CB operator that wanted to put up a big tower, but he never did put the tower up before he sold it to me.

The tower was made by Pirod and it is self supporting and uses solid iron rod for its structure not tubular. The bottom 20 feet weighs over pounds and the total tower is close to pounds. Each section is easily bolted together and can be lifted as one solid structure onto the base see the pics. The tower is then place onto the anchor bolts where it is leveled and secured. After bolting it down I made the trip up to the 60' point to unhook the lifting strap.

I then made my way to the top to await the antenna lifting. I knew of others using the Cushcraft 2 ele. I really did not want to have a huge debug period, because the contest season was getting near as it turns out I really didn't know what I was getting myself into over the next 3 years. The final decision was based on input from the local hams and conversation with the manufacturers.

In the fall of I finally had a quad-band antenna at '! When the antenna was installed, it was like we moved closer to the coast. The only disadvantage was 10 meters. I soon noticed the need for more and better antennas in the contests Actually Tom, N6BT, had one there to sell, but he did not want to drag home on Sunday so we came to an agreement. The antenna was stacked with the C-4XL and we noticed an improvement while working the contests.

I can't say we were able to break the pile-ups significantly better although it was better than a single antennabut the combo of antennas were great while running the pileups. In essence we had gain in multiple directions. Next was the addition of a 80 meter rotary dipole. The Force 12 EFB antenna was installed in the Fall of and proved to be a great addition to our station.When you subscribe, you receive only messages for the product you have subscribed to.

You can check your current subscriptions and remove yourself from subscriptions at any time by visiting the Reviews Home page and clicking on the 'here' box under Subscriptions. If you have comments, questions, or problems with this procedure please write to the Forums Manager.

This project involves a management team of volunteers who each take a topic of interest and manage it with passion. The site will be something of which everyone involved can be proud to say they were a part. Toggle navigation. Forgot Password. Reviews Home. N5SM Rating: Best hf antenna ever!

Time Owned: more than 12 months. I have had it on top of a 50 foot Rohn 45 tower for 11 years without taking it down, and it still works as good as the day I put it up, and that is perfect!

I have worked the world with my 10 watt K2 and this antenna. I live on the high plains of west Texas where we have lots of wind. Forty to fifty mph is normal. I've seen so much ice on the elements that the ends seem to point straight down, but they always rebound when the ice is gone.

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The price seems a little high on this antenna, but it will outlast the other brands three to one! You can't go wrong with this one. Scott N5SM. I have owned the Force 12 C3 Beam sinced10 years. When I assembled it and put it up, the standing wave ratio was less than 1.

It today still holds that ratio. The beam is on a 40 ft. I have gotten my W. I have had great signal reports for the whole period I have owned the beam. The wear on the beam is still sturdy and durable.

It has been through wind and ice storms. Well worth the money for a life time of performance. John kt4oo. For what they ask for this antenna you would think the driven element insulator would last more than 5 years,The rivets elongate the radials.

Force 12 C-4SXL Rebuild

When that happens you have to devise a way to either bolt or hose clamp them back. Be pepared to take it down for part replacement especially if you live in a high wind area. This is an expensive antenna and should last longer. That's the bad part.Forgot Password?

force 12 c3

I have had my C-3S for about 2 years and even trying their best, our strong northwesterly winter winds could not harm it. Curious about whether the CS-3S could be used on other bands, I tried to load it up directly on 17 meters. When doing so, I was quite surprised that the antenna had slightly more gain off the back than the front! I confirmed this by many front-to-back checks both on receive and transmit.

This curious behavior made me believe that a 17 meter modification was possible. I developed the following modifications and have been enjoying a two element Yagi on four bands instead of only three. The modification is not very complicated and once all the components have been prepared, should not take more than a morning to install and tune. Taking a look at the C-3S and reading about the principles of operation, it is clear that the C-3S is not designed for 17 meters.

The main issue on 17 meters is that there is no dedicated parasitic element as on the other three bands. The basic C-3S is a two element Yagi with interlaced reflectors for 20, 15 and 10 meters. The driver uses a very efficient, patented, open sleeve system that does an excellent job of matching throughout the three main bands.

Considering the overall length of the 15 meter reflector, which is The particular length of the 15 meter reflector has a calculated resonant frequency of What I had in mind was an antenna that worked equally well on four, instead of only three bands, without cluttering the already busy boom any further and, of course, beaming in the same direction on all bands. Since making the modifications I am about to describe, I have been become quite addicted to the 17 meter band, especially during this low period in the sunspot cycle.

As the sun sets and the MUF gradually drops, 17 meters stays workable well after signals on 15 meters have faded completely into the noise!

With my objective in mind and taking a fresh look at the antenna, I decided to leave the open sleeve triband driver as is.

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The mismatch was not so bad that it was beyond the ability of the built-in antenna tuners to load on 17 meters.

Further, the rig did not sound deaf as if there were a complete driver mismatch. I turned my attention to the reflector configuration.

Past experience with the successful application of linear resonators to 20 and 15 meter, two element Yagis, sent my thoughts in that direction and amazingly, the solution was right there. What if I change the existing 15 meter reflector into a dedicated 17 meter reflector and add a 15 meter linear resonator to the 20 meter reflector.

To attach a linear resonator is quite simple since there is no need to drill holes in the existing structure. It actually hangs on the element with two clamps and acrylic hangers as will be explained later. Referring to my article on linear resonators, I will review what a linear resonator is and its uses in HF antenna applications. A linear resonator is an LC inductor-capacitor circuit consisting of a one-turn rectangular shaped coil, shown in the schematic diagram, Figure 1.

B-C-E-F is the inductor; resonated by the variable capacitor D.QRZ Forums. Force C3 vs. I'm about to send a package to the engineer who's going to do the calculations needed for my tower building permit application and one of the things I need to decide is which antenna. The tower is going to be a 64' free standing tower with 40 sq. This will be my first tower and large beam all of my prior antenna experience has been with verticals and wire antennasso I don't know how to decide among the three listed in the subject of this post, or to perhaps consider something else entirely.

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I'm sure performance of these beams is comparable -- how do they compare regarding ease of assembly and durability once up on the tower? I don't climb fear of heightsso I don't want something that's going to require constant fiddling. My primary interest is DXing on CW, phone, and digital modes. W6UVAug 30, I've installed all of these over the years.

I'd say they're not terribly comparable! The KTXA is much larger than the other two and is a better performer on all three bands; it's also heavy and more complex to assemble. I don't know if the "new" ones now that MFJ has taken over manufacturing and relocated where they're built are as good as the "old" Hy-Gain's original ones were, because I haven't looked closely at one since they "moved.

The C3 is lightest, smallest and easiest to assemble. It hasn't any traps like the TH-7 and hasn't any stubs, capacitors and shorting bars like the KT, so it's a much "simpler" antenna.

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One can be assembled in about an hour, and it just rivets together. But it's about half the size of the KTXA and about half the gain: The C3 is really only a 2-element yagi on each band. Due to its relative simplicity, it probably has the best chance of surviving a very long time without any maintenance.

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Sounds like the TH-7DX might be the best compromise between these three. I've heard that the 36XA has over parts and requires precise measurement and several days to assemble. That might be an issue considering I don't have a lot of open space near the tower to assemble it. Are the traps likely to give problems down the road? I've heard stories of hams opening up the traps and finding them packed with dead bugs and other assorted junk after being up on a tower for a few years.

Yes, the TH-7 is a very good deal a lot of bang for the buck. If you have some extra money, you might consider the THDX. It covers and is a very good antenna, covering five bands instead of three. A bit more of an armful, though. The KTXA has a lot of parts. I don't know if it's really "," but it's a lot.

Old Force 12 C3-SS ?

I assembled one in one day a few years ago, but it was a long day. The TH-7 takes hours. The C3, about an hour. Like Steve I have owned all three over the years. I have come to the point where I try and avoid trapped antennas if I can.


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