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Adding Elevation Control to a C-Band Mesh Dish

If you purchased a consumer C Band mesh dish from us beginning in early 2018, your polar mount probably came with an “L-bracket”. Many of you have been asking us what this part is for?

Quite simply, this part bolts on the dish arm (and on top of the actuator plate) as shown below and allows you to add an actuator arm for elevation control.

The clamp of the actuator bolts to the L-bracket hole and the end of the actuator jack bolts to the collar mount where the threaded rod usually goes.

Why would I need elevation control on a polar mount dish? Good question. It turns out that a polar mount for a satellite dish can only approximately track the Clarke Belt. As you probably know, the elevation (in degrees) is usually set to the latitude of the dish location, thereby making the polar-axis of the mount parallel to the Earth’s polar axis. Then a few degrees of declination is added to tilt the mount slightly downwards so it sees the Clarke Belt.

Unfortunately, unless the dish is located at one of the Earth’s poles (i.e. North or South) or at the equator, the declination required for precisely tracking the Clarke Belt will vary ever so slightly from satellite to satellite. So instead of tracking a perfect circle (i.e. the Clarke Belt) at the equatorial plane, you end up tracking an ellipse that only approximates a circle. The difference is greatest between the zenith and horizon satellites. This is why a polar mount dish can never perfectly track the geostationary satellite arc. If the declination is set accurately for the horizon satellites (i.e. the ellipse and circle intersect at this point), then one finds this same declination is slightly off for the zenith satellites (the ellipse and circle do not quite touch). Most people get around this problem by adding or subtracting a bit of elevation to the mount so it is no longer exactly equal to their latitude. This makes the ellipse a better fit for the circle, but still not perfect. Remember, elevation adjustments have the same effect as declination adjustments for zenith satellites, but little effect for horizon satellites. This works well for most people, but if you want more precise tracking of the Clarke Belt, you need to either motorize the declination or elevation. This lets you change the shape of the ellipse so it touches the circle for every satellite. Makes sense?

Of course if your pole is not perfectly plumb or your dish is not aimed exactly due south, the ellipse you track will be a really bad approximation to the Clarke Belt circle. Again, a bit of motorization on the elevation can rectify the problem and you don’t have to go outside every time and make adjustments manually.

So this is the purpose of the mysterious “L-bracket” included with your dish. If you want to motorize the elevation for your dish, we recommend the following actuator sizes:

13.5ft / 12ft Antenna: 18″ Heavy-Duty Actuator

10ft / 8ft Antenna: 12″ Heavy-Duty Actuator

In the future, you will be able to purchase an azimuth motor for your dish, which will rotate it on the pole. You will then have an AZ-EL dish mount, which is the most precise dish mount possible (pin-point accuracy) and used by the satellite professionals!

Antenna Replacement Parts are now Available

When you purchase an antenna from Tek2000.com you never have to worry about finding replacement parts. We now stock spare parts for every antenna we sell, including mounts, panels, arms, collars, declination screws, actuator plates and much more. We also have hard-to-find replacement parts for actuators like reed switches, motors, gears and so on.


Got a problem or missing a part for your big dish? Like a car, your big dish has a lot of mechanical and electrical parts and sooner or later, something will breakdown. When that happens, just search our vast inventory of parts and we’re sure you’ll find what you need to get your big dish up and running again. If you don’t see it on our website, make sure you contact us because we probably have what you need.

Another great service from your BIG DISH SUPERSTORE!

Closed for Christmas Holidays


As 2018 draws to a close, we would like to thank all our valued customers for another profitable year in the TVRO business! We look forward to seeing you again next year!

Our store will continue to accept orders over the holidays, but they will not get processed until the new year. We will resume shipping orders again on Jan. 4th, 2019.

Merry Christmas and Happy New Year to everyone!!

Commercial Antennas

We have started stocking commercial grade TVRO antennas intended for TV stations, cable downlinks and radio astronomy applications. These are heavy-duty construction antennas, with heavy-duty mounts and bases. They will be available in both mesh and stamped aluminum styles and will come in the larger dish sizes of 10′, 12′, 13.5′ and 16′

We intend to offer three mount styles: AZ-EL (fixed), Polar (motorized HH) and AZ-EL-Skew (motorized).  We currently have the commercial fixed mount antennas in stock and will offer the motorized versions for sale once the Sky Tracker positioner is available to the public. 

As always, we have competitive prices and low cost freight shipping anywhere in north America.

Tek2000 Launches New E-Commerce Website

In order to serve our customers better, Tek2000 has launched a new, interactive e-commerce website! Our satellite products are now labelled as “consumer” or “commercial” to help our customers purchase the right antenna, whether it be for home satellite TV reception or for professional TV broadcasting. 

Please use the interactive menu on the left to navigate through our products.  Our checkout system now offers both regular courier and motor freight shipping options, along with estimated shipping costs based on your zip code.  International customers can request a quote for sea shipping during the checkout process.

Thank you to all our customers who have purchased from us in the past and we hope to see you again in our TVRO store in 2019!!

Non-Penetrating Roof Mounts

 

We now have both consumer and commercial non-penetrating roof mounts (NPRM) in stock. Pictured above are the consumer models with pyramid base and designed for our 8′, 10′ and 12′ antennas. The commercial models are designed for our 10′, 12′ and 13.5′ antennas.

 

Each modular tray measures 4′ x 2′ and weighs just over 100 lbs and can be assembled in either a  “T” or “I” layout. Each tray can hold up to 8 concrete blocks (consumer models) or 9 concrete blocks (commercial models). For structurally strong roofs, you can add a second level of concrete blocks to minimize the number of modular trays required. For weaker roof structures, we recommend using additional modular trays to spread out the load and take advantage of the principle of moments (i.e. Archimedes discovery of the lever)  to reduce the total ballast weight.

We recommend using 16″ x 8″ x 8″ (each weighs 36.5 lbs) concrete blocks as ballast which can be purchased for $1.61 from The Home Depot:

Concrete Blocks

You can purchase our non-penetrating roof mounts from here:

NPR Mounts

 

 

Anti-Interference (Wimax) LNB Products

 

 

 

 

 

 

We now carry a variety of anti-interference (Wimax) feeds for our C-band antennas. Terrestrial interference from a microwave tower will usually enter the feed system through the side and rear lobes.  For your reference, the radiation pattern of a parabolic antenna is shown above, and yes, although counter-intuitive, interference can also enter from the rear of the antenna. The wave guide of the feed (cylindrical part) does an excellent job of attenuating all frequencies below 3.4 GHz because it was designed with this cut-off frequency in mind. The diameter of the wave guide determines the cut-off frequency, meaning, a smaller diameter wave guide will have a higher cut-off frequency. Unfortunately, all unwanted signals above the cut-off frequency will enter the feed system and cause reception problems.

At the moment, the largest source of terrestrial interference for C-band operators is caused by wireless carriers transmitting between 3.4 – 3.6 GHz.  Symptoms of terrestrial interference include:

1. If you are less than 1 mile from the microwave tower, nearly all satellite transponders in the direction of the tower will be washed out. In the opposite direction of the tower, only one polarization (H or V) will be severely affected.

2. If you are less than 10 miles from the microwave tower, you will only experience interference on a few transponders and on only one or two satellites (in the direction of the tower), while the rest of the satellite signals will appear normal.

3. If you are more than 10 miles away from the microwave tower, it is unlikely that you will suffer from any interference.

The main symptom of terrestrial interference in all cases will be an SNR that jumps from a normal reading to something less. For example, if your antenna registers 12.0 dB in the absence of interference, then the SNR might jump between 12.0 and 10.0 dB for mild interference. For extreme interference, it will jump from 12.0 to 0.00 dB.

The solution to this interference problem is to incorporate a microstrip band pass filter in the LNB that passes only the frequencies 3.7 – 4.2 GHz and rejects all others. We now carry a variety of such feeds (single LNBF, dual LNBF and orthomode) with band pass filters to improve satellite reception and we will slowly be phasing out our stock of old feeds (3.4 – 4.2 GHz).

You can find the anti-interference feeds here:

Single Output LNBF

Dual Output LNBF

Orthomode Feed

There is no need to suffer from Wimax interference any longer!

 

 

 

 

Old School C-Band Orthomode Feeds back in Stock

 

C-Band orthomode feeds are now back in stock. These feeds are typically used by the cable head-ends to separate and simultaneously receive the V and H polarities. You can run the outputs to a switch and feed multiple receivers. You can also use this setup with a single receiver, but you will have to separate your channels into H and V polarities. This can be easily accomplished with the ZGemma 4K receiver which has a dual DVB-S2 tuner.

These orthomode feeds also come with “mini” LNBs which means they will fit under most feed covers (including the one sold with our antennas) and stay dry.

You can purchase below:

C-Band Orthomode Feed

As usual, we have the lowest prices and will not be undersold!! :thumbsup

Arrival of 2018 Mesh Dish Models

 

I’ve been informed this morning that several containers full of mesh antennas have arrived in the port of Vancouver. They have been grounded and will be trucked to our warehouse in Ontario within 2 weeks. After that, all backorders will start shipping out. These are the latest designs (2018 models) and include 12′, 10′, 8′ and 6′ dish sizes and np roof mounts, pole adapters and tall poles. I will start emailing tracking numbers to everyone next week if you ordered these products, but keep in mind they will only track once they are actually dispatched from our warehouse.

We are still taking pre-orders on these antennas for a few more days. We sold more antennas than anticipated this winter (mostly to Florida and the Caribbean) and anticipate strong spring sales too. I ordered 25% more mesh dish stock for this year, but I can’t guarantee they will last to the end of the year. If they don’t last, hopefully I will have solid antennas in stock later in the year. But if your preference is mesh, then March/April/May is an excellent time of year to install these!

Thanks to everyone who supports us. Without you, the modern TVRO revolution would NOT be possible!