>600MHz LTE filters/LPF-600 substitutes? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 15 Old 08-30-2019, 04:25 PM - Thread Starter
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>600MHz LTE filters/LPF-600 substitutes?

I install antennas in areas where I have verified that 600MHz LTE signals are now present. I've been using Linear LPF-600s (the only >600MHz filters I could find) and they seem to work fine. However, I went to order more, found they were out of stock all over and the one place I ordered from e-mailed me back and told me they were on backorder with Linear until November. I checked Tin Lee and their filters start at $150. Any other options?
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post #2 of 15 Old 08-30-2019, 08:23 PM
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Quote:
Originally Posted by mattdp View Post
I install antennas in areas where I have verified that 600MHz LTE signals are now present. I've been using Linear LPF-600s (the only >600MHz filters I could find) and they seem to work fine. However, I went to order more, found they were out of stock all over and the one place I ordered from e-mailed me back and told me they were on backorder with Linear until November. I checked Tin Lee and their filters start at $150. Any other options?
Hopefully Channel Master will redesign their LTE filter due to new repack cellular frequency 600MHz.
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post #3 of 15 Old 09-01-2019, 06:23 AM
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Since 600Mhz filters can significantly atrenuate channels 35 and 36, a better solution needs to be marketed.
My market has a channel 36 station that is revoved with a 600Mhz low pass so the Channel Master is still the best solution here.
And my service monitor sees nothing in the 600Mhz
spectrum strong enough to cause any issue.
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post #4 of 15 Old 09-18-2019, 03:17 PM
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Originally Posted by mattdp View Post
I checked Tin Lee and their filters start at $150. Any other options?
There was a company East of Syracuse NY (Communications & Engineering) but they unfortunately went out of business. They were partners (of sorts) with Tin Lee, but their traps & filters were less expensive.
It's too bad they still aren't around, they were my go-to source from single channel traps.

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Recording free OTA TV for 'time shifting' has been here since 1975. Will there be DVR's to do the same when ATSC3 obsoletes existing DVR's??
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post #5 of 15 Old 09-19-2019, 10:00 AM
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Jan Jenca on eBay can probably make what filter you want for less than $50. Lead times may be long though as they're located in Slovakia. https://www.ebay.com/usr/jan_jenca?_...p2047675.l2559
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post #6 of 15 Old 09-19-2019, 02:10 PM
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Any idea on shipping??

That $50 notch trap bandwidth is way too wide. 25megs doesn't cut it with even a one channel removed adjacent channel. And that's at -5db down instead of the typical -3db.

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Recording free OTA TV for 'time shifting' has been here since 1975. Will there be DVR's to do the same when ATSC3 obsoletes existing DVR's??

Last edited by videobruce; 09-19-2019 at 02:54 PM.
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post #7 of 15 Old 09-19-2019, 03:37 PM
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Shipping is included in their price and many of Jan Jenca products are about 40 dollars. My last two orders from them took 9 and 12 days from ordering to delivery.
John
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post #8 of 15 Old 09-19-2019, 04:28 PM
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I see that now.

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Recording free OTA TV for 'time shifting' has been here since 1975. Will there be DVR's to do the same when ATSC3 obsoletes existing DVR's??
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post #9 of 15 Old 09-20-2019, 08:09 AM
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Quote:
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Any idea on shipping??

That $50 notch trap bandwidth is way too wide. 25megs doesn't cut it with even a one channel removed adjacent channel. And that's at -5db down instead of the typical -3db.
You'd have to contact them and see if they can make what you want to your specification. They customized a band pass filter for me for $5 above the list price on eBay.
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post #10 of 15 Old 09-20-2019, 08:16 AM
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I already have. The time difference kinda slows things down somewhat.

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Recording free OTA TV for 'time shifting' has been here since 1975. Will there be DVR's to do the same when ATSC3 obsoletes existing DVR's??
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post #11 of 15 Old 09-25-2019, 08:34 PM
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Originally Posted by ctdish View Post
Shipping is included in their price and many of Jan Jenca products are about 40 dollars. My last two orders from them took 9 and 12 days from ordering to delivery.
John
My Jan Jenca order took about 8 days. The bottleneck is customs in NYC, my package stayed there 4 days before it moved on.
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post #12 of 15 Old 09-29-2019, 09:49 AM
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Quote:
Originally Posted by old tv guy View Post
Since 600Mhz filters can significantly atrenuate channels 35 and 36, a better solution needs to be marketed.
My market has a channel 36 station that is revoved with a 600Mhz low pass so the Channel Master is still the best solution here.
And my service monitor sees nothing in the 600Mhz
spectrum strong enough to cause any issue.
Jan Jenca made my filter 470-608Mhz. It passes Channel 36 fine, I have a very strong RF36(WUNE). Hope Channel Master is making something similar at a good price point.




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post #13 of 15 Old 10-18-2019, 08:03 PM
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The need for this may be growing. T-Mobile lit up a cell tower near my home at 11 AM today, and RF 39 and 40 jumped to a signal strength of nearly 100 on my HDHR, same as the full-power stations on RF 29-36.

It's not causing me any grief, but I wonder about others who may have weaker stations at RF 36 and are also very near 600 MHz-band cell towers.
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post #14 of 15 Old 10-19-2019, 11:29 AM
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Originally Posted by JHBrandt View Post
The need for this may be growing. T-Mobile lit up a cell tower near my home at 11 AM today, and RF 39 and 40 jumped to a signal strength of nearly 100 on my HDHR, same as the full-power stations on RF 29-36.

It's not causing me any grief, but I wonder about others who may have weaker stations at RF 36 and are also very near 600 MHz-band cell towers.

The HDHR shows 100% Signal Strength at 0 dBmV or -48.75 dBm and greater. The TV dynamic range runs up to around -8 dBm or 40 dB stronger. It's too bad they chose to set 100% to 0 dBmV because it's not helpful in seeing how strong a signal really is. In many cases 100% on the HDHR is no problem at all for the TV tuner.
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post #15 of 15 Old 10-19-2019, 12:21 PM
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Yeah I kind of figured: even with all my strongest stations at 100, I could still increase amplification quite a bit before I saw any signs of overload. So the HDHR doesn't really tell you how close you are to the point of overload. The best I could do was set my amplification so that a few strong stations were slightly under 100, and as long as the weaker stations were still OK I figured I was fine.

I just don't recall ever seeing a cell tower signal that strong before, and I figure some folks are even closer to a tower than I am, so they might have a problem (especially if they're in a fringe TV reception area).

Strangely, that strong cell tower signal was on for just about exactly 24 hours, then today it switched off again. So it must have been a test. But I suppose eventually it will switch back on permanently.
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