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900 MHz low pass filter noise reduction [900-FLTR] - $43.95 :: Hobby Wireless - FPV Store - The Best in Wireless System
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900 MHz low pass filter noise reduction

$43.95

 

 

 

Description:
This Low Pass Antenna Filter is designed to reduce the unwanted harmonics on 900MHz wireless video transmitters. Ideal for reducing the video transmitter's radiated EMI / RFI (RF noise). 
Installation is as simple as removing the antenna and then attaching the filter. Works with all popular transmitter antennas that use standard SMA connectors.
 
Features / Specifications:
 
    * Designed for 910-1040 MHz wireless A/V transmitters.
    * Low insertion loss, less than 0.8dB typical at 910MHz.
    * Efficient monolithic LC multi-pole topography design.
    * Second harmonic attenuation greater than -45dB (-26dB typ at 1570MHz).
    * SMA connectors (male / female).
    * Inserts between transmitter and antenna.
    * Characteristic impedance 50Ω.
    * Supports RF power up to 8 watts.
    * Small size, 1.4 x 0.4 x 0.5 inches (34 x 10 x 13 mm).
    * Lightweight, 8 grams.
 
 
Important information:
The popular 900Mhz A/V transmitters sometimes cause EMI/RFI related interference to
nearby electronics. The common symptoms are poor GPS receiver operation and reduced
radio control receiver range, especially when these items are close to the A/V transmitter.
Solving the interference problems can often be painful and frustrating. But, with
thoughtful changes to the installation, the interference issues from the A/V transmitter
can be substantially reduced and in many cases they can be eliminated.
But let’s make one thing perfectly clear. Success is the result of several minor
changes, where each one provides an incremental advantage. All the changes,
when taken together, will often result in improved operation and reduced EMI/RFI
problems. So, skipping some of the suggestions presented here may result in
failure to solve the problem. 

SCOPE
The 900Mhz / 500mW A/V transmitter is perhaps the most popular, so we will
discuss ways to improve its installation to reduce typical EMI/RFI issues. This
transmitter is available from several sources, including www.dpcav.com.
The examples discussed here will be directed toward solving GPS receiver interference issues (low
satellite counts, fix failures, etc.), but the solutions are just as appropriate for other devices that
refuse to work well near the A/V transmitter.
The A/V transmitter interference can be from radiated (through the air) or conducted (through the
wiring) paths. We’ve found that many users concentrate on just one of these interference
mechanisms, and ignore the other, which usually results in a less effective solution. It is important to
attack both interference mediums, so we will discuss solutions to do that.

 

MY INSTALLATION IS THE SAME AS YOURS, SO IT SHOULD WORK FINE
One of the biggest traps we have seen users get into begins when the installation that has EMI/RFI
problems is ‘exactly’ the same as another one that works well. This causes all sorts of confusion and
frustration to those not familiar with RF interference problems.
So, here is the bottom line. When it comes to EMI/RFI, there are no two identical installations.
Repeat that again, there are no two identical installations. They are all different, regardless of how
closely they have been copied. Now that you have memorized this important concept, you can
confidently ignore anyone that tells you that “your installation should work without problems because
mine is fine.” EMI/RFI is a cruel issue and it does not care about such boastful claims.

 

DISTANCE IS YOUR FRIEND
Most installers are aware that maximizing the distance between the 900Mhz (500mW) A/V
transmitter and the GPS receiver is important. But for some reason they ignore such words of
wisdom, perhaps because they have a compact installation that makes this difficult to do. The reality
is that unless you provide sufficient distance, your installation will be doomed regardless of any other
tricks you try.

 


Add to Cart:

  • Model: 900-FLTR



This product was added to our catalog on Friday 03 July, 2009.
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