Philips LTE Filter for TV Antenna, Filters 4G 5G LTE Signal to Reduce Interference and Pixilation for Clear Digital HD TV Reception, Frequency Range 5-608 MHz, Indoor Outdoor Installation, SDW1520/27

For those who don't know what this product is about, a quick (simplified) summary of major changes to Over-the-Air Television in the United States.UHF TV reception in the US originally consisted of channels 14 to 83 (460 to 890 MHz) introduced through FCC regulation in 4/11/1952. The 800 MHz portion (channels 70 to 83) of the UHF TV band were reallocated already back in 1983 for other services (including but not exclusively to mobile telephone service).Effective 6/12/2010 (immediately following the Analog to Digital TV conversion) the 700 MHz portion of the UHF TV band (channels 52 to 69) were auctioned off by the FCC of which AT&T (band 12, 699 to 746 MHz) and Verizon (band 13, 746 to 787 MHz) were the major winners.Since then the FCC conducted a "repack" requiring TV broadcasters to move from upper UHF channels to lower UHF channels or back to VHF (were many stations were broadcasting prior to the Analog to Digital TV conversion), including to the low-VHF band that was originally deemed unsuitable for digital television. In 2017 the FCC then auctioned off the 600 MHz portion of the UHF TV band (channels 38 to 51) of which T-Mobile was a significant winner (band n71, 617 to 698 MHz). TV broadcasters had until June 2020 to complete their relocation and to free up the 600 MHz spectrum. TV channel 37 has been and continues to be a reserved channel for radio astronomy which means that the usable UHF TV band has shrunk to channels 14 to 36 (460 to 608 MHz).All of the above refers to the actual RF channels on which your local stations really transmit (which has absolutely nothing to do with the channel numbers your TV will display).Depending on how old your TV tuner is, it will be designed to receive signals from the 600, 700 and possibly (so less likely) 800 MHz ranges which no longer contain any TV programming. The mostly mobile phone transmissions on those bands can interfere with the TV programming you are actually interested in. To prevent nearby cell towers and even your own cellphones from interfering with your TV reception, a number of companies make filters to block the unwanted signals from getting into your TV.This product (Philips SDM1520/27) is one of those products. It was half as expensive as a similar product (ChannelMaster CM-3201 also here at Amazon) which I also purchased. Needless to say, I was curious whether or not the higher price of the CM-3201 was worth it and I wanted to rely on science instead of subjective testing (e.g. how many times a particular channel pixelates within an hour).I therefore used a NanoVNA-H4 to measure the filter characteristics. I'll state upfront that using test equipment for 50 Ohm impedance with 75 Ohm impedance filters does introduce some errors into the measurements, however since this is the same impedance mismatch in both cases it still results in a valid comparison.An ideal (impossible) filter would have no attenuation below the cut-off frequency and infinity attenuation for any frequency above it (meaning that there would be no transition band at all). Real filters reveal their quality by how much they attenuate unwanted signals and how wide the transition range is (the frequencies between start of attenuation and full attenuation).Both filters showed a start of attenuation at 606 MHz (first visible sign of attenuation in the LogMag trace, not the 3dB attenuation commonly used to characterize filters) which is still within the frequency range for TV channel 36 (I subsequently tested the filters on a local station that uses RF channel 36 and the reception was fine). Also both filters showed reasonably low figures for insertion loss (the attenuation of a good signal just because the filter is being added).The ChannelMaster CM-3201 showed a transition band of 36 MHz (less is better) and attenuation of nearly 60dB (more is better, but 60dB is already excellent).The Philips SDM1520/27 (this product) showed a transition band of 72 MHz (a bit disappointing that it is so wide) and attenuation of about 30dB (which is good, but higher would be better).In-line filters are often symmetrical and can be used in either direction. Both the CM-3201 and the SDM1520/27 have explicit input and output markings but I did not test whether the filters behave any different when used backwards.The Philips SDM1520/27 is significantly smaller in diameter which may be an advantage on some TVs with recessed antenna connectors.Bottom line, this filter does work and while it is not as impressive as the more expensive one I compared it with, keep in mind that it only costs half as much. I don't see any reason to deduct a star in rating just because a more expensive product has better test results.Not everybody may need these filters (locations of TV and cell transmitters play a big role) and if you do, you may get satisfactory results from this cheaper filter. If you are concerned about getting the best results spend the extra money on the ChannelMaster CM-3201.However beware of any filters that are still sold which are based on the 2010 elimination of the 700 MHz band since those are not blocking cell transmissions in the 600 MHz range.

First, this is the CORRECT filter with the CORRECT bandpass frequencies of 5 - 608 mhz. Other filters similar to this allow too much to still pass through. I think Channel Master also has a filter that appropriately blocks what's necessary, but it costs more $$. This one works as advertised. You need to place this filter on your TV set connector and then attach your antenna able to the other end of this connector. Just screws right on. You may, or may not, need to add a preamp into your line to make up for losses. This is a good value for $10 if you're experiencing pixalation caused by nearby cell towers, or other causes (not weak signal) and need to filter out those offending frequencies. You need one of these for each TV. Can't speak for how long it lasts, but I don't see any reason it shouldn't last.

I live on a fairly quiet street but when certain cars and trucks (garbage, delivery) go by the TV signal can freeze, pixelate and even drop for short but annoying intervals. This Phillips filter has reduced thees occurrences by about 65% and I've picked up Catchy, NEWSMAX and a few others that never came in before. Overall, pictures are sharper and stable. Is it perfect? No. Is it worth it? Yes definitely

This product purports to filter out 4G and 5G LTE "noise" that interferes with over-the-air digital television broadcast signals. Here's my experience with it.I live in an urban area, and I have an antenna in my attic, which I purchased and installed last year, along with a signal amplifier at the antenna site, and all new shielded coax cable leading from the antenna to the television. With this setup, I am able to receive 116 channels from the local TV stations in my area.I've noticed, however, that a handful of channels are subject to video break-up from time to time, and, given my location in the city (as well as the fact that my signals are already amplified), I thought that the situation might be improved by adding this filter to my setup.I initially installed the product right at the television set, as this was the easiest approach. Once installed, a new channel scan reduced my number of stations from 116 to 74. Certainly, that was not what I was looking for, so I went up into the attic and installed the filter right at the antenna. This reduced my channel count to 68.When I removed the device entirely, I was back up to 116 channels.Now, I'm not a novice here, as my OTA setup should indicate, so I feel pretty confident that I am installing this thing properly (it's not exactly rocket science). I think that my reduced channel counts with the device attached speaks for itself.In attempting to filter out cellular phone noise, it seems that this product throws the baby out with the bathwater. I find this both surprising and disappointing, as the Philips name has been a leader in electronics for decades (we're talking about the people who invented the cassette tape, among other innovations).Accordingly, I cannot recommend this product.