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There is a lot of confusion about the differences between the 30m Series and the 17m Series. This is because they both offer similar features, but there are some important differences to consider. Here are some of them:

Relay box

A relay box is an electrical device used to control high power circuits. It can be used to operate heaters, abs systems, cooling fans and ignition circuits. Relays are also used as a protective device.

Typically, relays have one or more contacts, and they can be connected to each other by a common terminal. However, it is important to remember that a common terminal never connects to both terminals at the same time. The movable armature is returned to its initial position when the coil current is off.

There are two types of relays, namely, SPDT and DPST. In a SPDT relay, there are change over contacts, and in a DPST relay, there is only a single change over contact.

A relay is used to protect a circuit from over-current. It works by opening or closing its contacts to break or maintain the current. Some relays also act as amplifiers, which amplify low voltage signals. They can be operated manually or automatically.

A relay is also used as a sensing device. It is able to detect and inform of a fault in the circuit. It can break or close the contacts when an error occurs.

A relay can be powered by a battery or a DC input. The rear panel allows the DC power to enter via banana sockets. Usually, a diode is placed across the coil of the relay, which protects the terminals from damage.

When a relay is switched off, a large voltage spike is produced. For this reason, it is best to consider galvanic isolation for high power circuits. This can be achieved by using a resistor instead of a diode. Resistors are usually more durable than diodes, but they are not as effective at eliminating voltage spikes.

While a relay box is often a useful tool for DXing, they can also cause problems if they are not installed properly. Before choosing the right protection for your equipment, it is recommended to review the product documentation. You should also assess the sensitivity of the components. If you are unsure of any of the information provided, it is a good idea to contact the company to inquire about the latest agency approval.


If you are in the market for a new station, you might want to consider adding a 17m and 30m multi-band beam to the mix. Not only are these antennas a blast to operate, but they are relatively inexpensive. Fortunately, there are several manufacturers that offer add-on kits for both hams and non-hams alike. Most importantly, these are easy to install. Plus, the requisite amount of patience will pay off in the long run. So, what is your next step? Listed below are the top five companies to consider.

The first company is JK Antennas, where they offer a wide selection of ham radio equipment ranging from full-size, telescopic beams to simple-to-build wire-to-wire kits. Their offerings are well-priced and backed by the slickest customer service. For a little extra cash, you can also snag an exclusive 30m or 17m add-on kit. Alternatively, you can go with one of the big boys.

A quick check of the web will net you a plethora of online retailers that sell the same swag. For a mere ten bucks or so, you can snag an add-on kit for 30m, 40m, or even 60m. Whether you are looking for a cheap way to expand your station, or just want to try your hand at DXing, these slick operators are sure to deliver.


Interlace is a nifty little trick that allows two fields to be viewed in parallel on a single display. It’s most common application is in television where it’s used to provide an image that is sharper than its counterpart. In the past, it has been employed by computer monitors, as well. But it’s also been found to be a useful technique in LCD displays, where it is often combined with progressive scanning to improve the look of moving objects onscreen.

There are a few notable limitations. For instance, interlacing is only useful when a source material has a refresh rate of greater than 50 Hz. The best way to utilize the technique is to use a separate feed for each antenna, rather than combining them into one. This enables each individual antenna to operate independently, thereby avoiding the complications that can arise from shared feeds.

As for the benefits of interlace, the main benefit is a higher refresh rate, which allows moving objects to appear more lifelike. On the other hand, a slower refresh rate can result in a grainy and blurry image, especially in darker areas of the screen.

One possible drawback is that a dual-scan LCD can only be displayed in one mode, so there are limitations to its uses. In addition, the ability to see both fields at once would only benefit some users, such as those viewing a TV with a larger than life image. If the source material is not available at a high enough refresh rate, interlacing could be the best way to go.

Regardless of its limitations, the interlace signal has been around for several decades, and is still used in many standard definition televisions today. While the PC industry has been staunchly opposed to interlacing, the technology has survived to become the standard for high-definition HDTV. Using the interlace protocol, viewers get the benefits of both the 30m and 17m series’ aforementioned technological innovations. Although the technical challenges of implementing interlace aren’t over, the ubiquity of its use indicates that the process is here to stay.

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