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post #1 of 27 Old 01-12-2017, 08:04 PM - Thread Starter
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TV loses OTA signal when Roku is connected

I just set up my 55" KS8000, scanned for over the air. channels. Got 18 of them. Works fine.
I plugged in my new Roku 3, That works fine- But if I go to the TV source to watch tv, it says I have no channels ???
But if I unplug the Roku, the channels show up again. Any Ideas?
Just those two items are hooked up, Plus my HD antenna
Thank You
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post #2 of 27 Old 01-12-2017, 08:44 PM
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You say you have two items hooked plus the antenna. I only count one, the Roku. How do you have the antenna connected? The KS8000 has an internal ATSC tuner for HD OTA channels.
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post #3 of 27 Old 01-12-2017, 10:04 PM - Thread Starter
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You are correct, I only have the Roku plugged in. I have the HD antenna connect to the Samsung black hdmi box, along with the Roku (hdmi) When the Roku is connected, the TV source says No signal. I unplug the Roku box and the tv mode works fine??





Quote:
Originally Posted by Otto Pylot View Post
You say you have two items hooked plus the antenna. I only count one, the Roku. How do you have the antenna connected? The KS8000 has an internal ATSC tuner for HD OTA channels.

Last edited by Samshort; 01-12-2017 at 10:25 PM.
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post #4 of 27 Old 01-12-2017, 10:25 PM
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Quote:
Originally Posted by Samshort View Post
You are correct, I only have the Roku plugged in. I have the HD antenna connect to the Samsung black hdmi box. When the Roku is plugged in, the TV source says No signal
I take it there's no Cable/Ant coax input on the tv? Is the Samsung black HDMI box the One Connect Box?
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post #5 of 27 Old 01-12-2017, 10:43 PM - Thread Starter
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Yes, it's the one connect box It says antenna in
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post #6 of 27 Old 01-13-2017, 09:08 AM
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Silly question, but when you use the term "plugged in" do you mean to a power source or connected to the television. If "both," try unplugging the Roku from the AC outlet (I don't have one, I assume they get power via wall wart), but leave it connected to the TV. THEN see what happens.

Also, what kind of antenna and where is it located?

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Last edited by DrDon; 01-13-2017 at 09:44 AM.
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post #7 of 27 Old 01-13-2017, 11:16 AM - Thread Starter
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Plugged in meant hdmi connected. I did what you said. As soon as the Roku box powers on, it says no signal when I try to watch tv. Unplug the Roku from power, tv works fine
The antenna is on my window.



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Originally Posted by DrDon View Post
Silly question, but when you use the term "plugged in" do you mean to a power source or connected to the television. If "both," try unplugging the Roku from the AC outlet (I don't have one, I assume they get power via wall wart), but leave it connected to the TV. THEN see what happens.

Also, what kind of antenna and where is it located?

Last edited by DrDon; 01-13-2017 at 12:06 PM.
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post #8 of 27 Old 01-13-2017, 12:08 PM
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Not sure why you posted that link. It takes me to a sales site. So I removed it.

I'm going to move you to Technical, as I suspect you either have interference, a nasty grounding problem or not much signal to begin with.

You might want to give us a link to your OTA signal report from www.tvfool.com. Your address won't be visible to anyone but you. Link, please. Not an image. Just in case someone asks.

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post #9 of 27 Old 01-13-2017, 01:06 PM
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Sounds like either the Roku, the HDMI cable, or the TV set's HDMI port is defective and is emitting unwanted electrical noise that's being received by the antenna whenever the Roku is powered up. The interfering signals are strong enough to wipe out the reception of the desired signals.

Try a different HDMI port on the TV set, a different HDMI cable, the ROKU with cable on a different TV set (if you have one), etc to figure out what component is causing the problem.
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post #10 of 27 Old 01-13-2017, 02:01 PM
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Interference is certainly a possibility.
Quote:
The antenna is on my window.
The signals might not be very strong with that type of antenna.

It might be helpful to see your TVFOOL signal report as required in the sticky, and tell us which channels are important to you.
http://01966633.com/forum/25-hdt...-1st-post.html

You can do a report here:
http://www.tvfool.com/index.php?opti...pper&Itemid=29

What antenna are you using?
Was that information in the link that was deleted?

Grounding the coax with a grounding block isn't required for an indoor antenna, but sometimes it helps with interference problems.
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post #11 of 27 Old 01-13-2017, 09:08 PM - Thread Starter
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You asked what type of antenna I bought. That link was the Mfgr website of the one I bought My signal strength is very good. I'm only 10-15 miles away from the transmitters

http://www.tvfool.com/?option=com_wr...e6a4093a23c9b0



Quote:
Originally Posted by DrDon View Post
Not sure why you posted that link. It takes me to a sales site. So I removed it.

I'm going to move you to Technical, as I suspect you either have interference, a nasty grounding problem or not much signal to begin with.

You might want to give us a link to your OTA signal report from www.tvfool.com. Your address won't be visible to anyone but you. Link, please. Not an image. Just in case someone asks.

Last edited by Samshort; 01-13-2017 at 09:13 PM.
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post #12 of 27 Old 01-13-2017, 09:35 PM
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Quote:
Originally Posted by rabbit73 View Post
Was that information in the link that was deleted?
It was the front page to some sales site. There were no antennas listed on that page, so I removed it, which is protocol.
Quote:
Originally Posted by Samshort View Post
You asked what type of antenna I bought.
Best to just give us make and model. We probably KNOW the antenna, anyway.

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post #13 of 27 Old 01-13-2017, 11:59 PM - Thread Starter
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it's made by 1bytone 35 mile range a zillion positive reviews on Amazon



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Originally Posted by DrDon View Post
It was the front page to some sales site. There were no antennas listed on that page, so I removed it, which is protocol.

Best to just give us make and model. We probably KNOW the antenna, anyway.

Last edited by Samshort; 01-14-2017 at 12:14 AM.
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post #14 of 27 Old 01-14-2017, 08:16 AM
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Here's a better link, then: http://www.1byone.com/TV-Accessorie...nna/OUS00-0566

@ProjectSHO89 's right. Let's see if we can pin it down. Tests to try in order:
1. Different HDMI cable between Roku and TV.
2. Roku and antenna placed as far away from each other as possible.
3. Roku powered from a different circuit (may require an extension cord)
4. Swap out the antenna for one like this. Keep receipts.
5. If it's feasable, swap out the Roku assuming you have a friend who owns one.

Oops. rabbit posted some of the same things while I was doing my edit \/\/\/

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Last edited by DrDon; 01-14-2017 at 09:26 AM.
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post #15 of 27 Old 01-14-2017, 08:20 AM
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Thank you for the signal report and the antenna information. Is this your antenna?



Your signals are very strong, but the antenna is very close to the Roku if you only have a 10 ft cable.

Are you using the available accessory amplifier?

Are all the signals wiped out by the Roku, or only the weaker signals?

Which model Roku do you have?

Are you powering the Roku from a USB port or the AC Power Adapter?

You can try
1. Moving the antenna further away from the Roku using a coax extension and an F-81 adapter



2. Using an outlet on another circuit for the Roku power supply
3. Powering the Roku from a linear DC power supply if the Roku power supply is a switchmode power supply (SMPS) which are known to cause interference
4. Grounding the coax with a grounding block that is connected to the house electrical system ground. As a temporary test, you can use a spare 3-wire plug grounding pin if you have properly wired and tested 3-wire receptacles or a known good ground like a metal cold water pipe.
http://en.wikipedia.org/wiki/Receptacle_tester



5. Wrap the Roku power cord around a ferrite choke
6. Wrap some aluminum foil around the Roku as a quick test, but not for long because the Roku will overheat

If none of those work, you might have to live with the problem and remove the Roku power for OTA reception.
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post #16 of 27 Old 01-14-2017, 12:46 PM - Thread Starter
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My antenna is not amplified same antenna as the one you posted.
It's a Roku 3 I have it as far away from the antenna as possible. tv is in a bedroom.
Tried plugging it into another power outlet using extension cord. Same results
I lose all the signals when Roku is powered on. AC power
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Quote:
I lose all the signals when Roku is powered on. AC power
Yeah, we get that, you already told us that.

Go do what was recommended and report your results.
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post #18 of 27 Old 01-14-2017, 01:23 PM - Thread Starter
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No need to be rude. I was explaining I tried the extension cord idea with same results


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Yeah, we get that, you already told us that.

Go do what was recommended and report your results.
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post #19 of 27 Old 01-14-2017, 02:16 PM
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He's not being rude. The things we told you to try:

Different HDMI cord between the Roku and the TV. Didn't see that result.

Different antenna. Didn't see that result.

Different CIRCUIT to power the Roku. If the other outlet you tried is on the same circuit, it won't matter.

Wrapping the Roku with aluminum foil. Didja try that?

We don't know what "as far away as possible" means. We're trying to get the two some 30-feet apart or more.

The antenna I linked was amplified. The one rabbit73 posted was not. We didn't know which one you had. Your original link was just to the 1byone front page. No antenna listed there and about thirty available. There's a reason we need make and model. We're not asking these things to annoy you.

I moved you to Technical because these guys are absolutely wizards when it comes to the science involved behind digital television, not to mention electronics in general. I know I've learned a boatload from these guys and I have LICENSES.

I think we all agree you have an interference problem coming from the Roku or its power supply. What we're having you run tests for is to see just where the culprit is. If it's too much trouble, then just leave the Roku unplugged when you're not using it.
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Last edited by DrDon; 01-14-2017 at 02:19 PM.
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post #20 of 27 Old 01-14-2017, 02:18 PM
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Thanks for the additional information.

Good luck with your further tests.

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post #21 of 27 Old 01-14-2017, 08:32 PM
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There is one other thing you can try that DrDon reminded me about. You can use a battery operated portable radio that tunes the AM broadcast band to hunt for interference. Often, if the interference is strong enough to affect TV reception, you can hear it on an unused frequency at the low 550 end or the high 1600 end. An FM radio doesn't work as well. The built-in antenna can act as a direction finder, as you carry it around.
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post #22 of 27 Old 12-02-2018, 10:51 PM
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Quote:
Originally Posted by Samshort View Post
My antenna is not amplified same antenna as the one you posted.
It's a Roku 3 I have it as far away from the antenna as possible. tv is in a bedroom.
Tried plugging it into another power outlet using extension cord. Same results
I lose all the signals when Roku is powered on. AC power
Who uses an antenna anymore hmph, get cable like everone else, you know you want to.

So this was never resolved (or so 2017?)
I'm getting this same issue ... attic antenna full size yagi, Roku 3800R, with the USB is plugged into the TV sets USB port.

Noted a high pitched hum when the Roku is plugged in, antenna reception comes right back upon unplugging the USB, to my understanding not a good idea to hot swap HDMI cables.

PITA to reach my hand back there but it works, I thought I had a defective Roku.
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post #23 of 27 Old 12-03-2018, 08:51 AM
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Quote:
Originally Posted by Bismarck440 View Post
So this was never resolved (or so 2017?)
Never resolved AFAIK. I see many other users having a similar problem with the Roku and the Firestick in a Google search.
Quote:
I'm getting this same issue ... attic antenna full size yagi, Roku 3800R, with the USB is plugged into the TV sets USB port.
If you are using the TV USB for power, that would seem to eliminate the AC adapter as a source of interference. You can try using the AC adapter instead and have it in a power strip that you can turn OFF.

Quote:
Noted a high pitched hum when the Roku is plugged in, antenna reception comes right back upon unplugging the USB, to my understanding not a good idea to hot swap HDMI cables.

PITA to reach my hand back there but it works, I thought I had a defective Roku.
Yes, not a good idea to hot swap HDMI; supposedly OK with USB, but I'm not even comfortable with that.

Your Roku might not be defective in the sense that it meets specs, but the design might be defective if the Roku stick is causing interference to OTA reception when it is powered ON.

Sometimes it helps to use a 10 ft HDMI extender to get the stick away from the TV.

The Roku stick is designed to increase its power to override any WiFi Direct interference, which might be strong enough to affect OTA reception, in spite of the great difference in frequencies. Try this:
http://forums.roku.com/viewtopic.php?t=83237

http://www.netconsonance.com/2016/06...breaking-5ghz/

Quote:

Here are the instructions to fix it.
  1. Start up the Roku and get to the home screen.
  2. Press these 10 buttons quickly: HOME-HOME-HOME-HOME-HOME-FFWD-PLAY-REWIND-PLAY-FFWD
  3. Select “Wireless Secret Screen” from the menu choices
  4. Select “Interference” from the menu choices
  5. Choose “None”

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post #24 of 27 Old 12-04-2018, 06:14 PM
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Thank you all for the above insight,

Roku is installed on my HD Set. I normally watch OTA on my CRT about 4 feet away with the same antenna feed (I move the feed to the HD set with the Roku when I prefer to watch OTA in HD, how I found this issue the other night). Eventually when the CRT finally goes, I'll be using the HD full time.

Indoor Antenna? Yes but no, it's a 10' + boom yagi UHF/VHF laying in the attic above, line coming into the room, a small set top amp (Gemini PH61107 12 dB Signal Amplifier) near my second TV I tap from that but to only one set at a time.

A hang on the wall antenna is pretty useless in my local, yielding only 1-3 channels & their subs.

I did one test, the I found Roku totally wipes out my lone problematic VHF channel, & severely pixelates the Remaining UHF channels, , This VHF channel was coming in this AM on the CRT , I turned on the set powering the Roku, (I have it on a "sensing" power saver tap, usually turned completely off most of the time)...& was surprised it did NOT affect the signal when the Roku was powered.

One other thing, the power cord is tied to avoid dangling cords (isn't that the idea of the stick?). Seeing the Roku's do not come with a on/off switch, it would be nice to switch the USB port.

An Easter Egg hidden within???

Here are the instructions to fix it.
Start up the Roku and get to the home screen.
Press these 10 buttons quickly: HOME-HOME-HOME-HOME-HOME-FFWD-PLAY-REWIND-PLAY-FFWD
Select “Wireless Secret Screen” from the menu choices
Select “Interference” from the menu choices
Choose “None”


I'm not that fast on a remote, (have issues entering address entries on my mobile). , though this prevents all interference or reduces it? & what are the drawbacks of this setting? & I can return it to default if I it creates usability issues?

I can provide a HDMI extension to see if that works, Use the supplied USB adapter at a remote location. (I imagine Roku uses your TV's IR circuit for the remote?) Any reason why is should NOT be using my TV's USB port for power? ie: added stress in the TV power supply which incidentally I recapped the PS a few years back prior to buying the Roku.

I have the 3900 (Express Roku) on my set downstairs though my antenna feed is hosed in that location, thinking of placing it on my set with the stick to see if it affects the antenna, I was kind of on the fence on getting the 3800 stick over a second 3900R

My biggest concern was/is do I have a defective Roku or is it just is what it is?

Last edited by Bismarck440; 12-04-2018 at 06:27 PM.
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post #25 of 27 Old 12-05-2018, 09:30 AM
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Quote:
Originally Posted by Bismarck440 View Post
Roku is installed on my HD Set. I normally watch OTA on my CRT about 4 feet away with the same antenna feed (I move the feed to the HD set with the Roku when I prefer to watch OTA in HD, how I found this issue the other night). Eventually when the CRT finally goes, I'll be using the HD full time.

I did one test, the I found Roku totally wipes out my lone problematic VHF channel, & severely pixelates the Remaining UHF channels, , This VHF channel was coming in this AM on the CRT , I turned on the set powering the Roku, (I have it on a "sensing" power saver tap, usually turned completely off most of the time)...& was surprised it did NOT affect the signal when the Roku was powered.
Your test seems to indicate the interference coming from the Roku stick affects the HD set, but not the CRT set or the common antenna because the Roku is close to the HD set.

Quote:
Seeing the Roku's do not come with a on/off switch, it would be nice to switch the USB port.

Any reason why is should NOT be using my TV's USB port for power? ie: added stress in the TV power supply which incidentally I recapped the PS a few years back prior to buying the Roku.
The reason why I suggested using the AC adapter in a power strip with a switch is so that, as a last resort, you could remove the power from the Roku when watching OTA on the HD set without needing to remove the USB power connector or fabricate a USB power switch.

Quote:
An Easter Egg hidden within???
Yes, so it would seem.
Quote:
Here are the instructions to fix it.
Start up the Roku and get to the home screen.
Press these 10 buttons quickly: HOME-HOME-HOME-HOME-HOME-FFWD-PLAY-REWIND-PLAY-FFWD
Select “Wireless Secret Screen” from the menu choices
Select “Interference” from the menu choices
Choose “None”

I'm not that fast on a remote, (have issues entering address entries on my mobile). , though this prevents all interference or reduces it? & what are the drawbacks of this setting? & I can return it to default if I it creates usability issues?
That appears to be the only way to reduce the interference coming from the Roku. I don't have a Roku, but I assume the menu would allow you to reset it to the default which is MAX output to over ride any interference.

Quote:
I can provide a HDMI extension to see if that works, Use the supplied USB adapter at a remote location. (I imagine Roku uses your TV's IR circuit for the remote?)
I think it's worth a try to get the Roku away from the HD set before trying to alter the menu to reduce the radiation.

Quote:
I have the 3900 (Express Roku) on my set downstairs though my antenna feed is hosed in that location, thinking of placing it on my set with the stick to see if it affects the antenna, I was kind of on the fence on getting the 3800 stick over a second 3900R

My biggest concern was/is do I have a defective Roku or is it just is what it is?
You should make some substitution tests before making any conclusions. I have zero experience with the Roku, but my intuition says the Roku meets it manufacturing specs, but the design is faulty.

Interference problems can be difficult to solve, and sometimes require more than one fix at the same time. I started experimenting with antennas when I was 8 years old. I'm now 85 and still learning. The biggest trap in troubleshooting is assuming what couldn't be causing a problem without verifying by test.

I had an ICOM 735 transceiver that was causing TVI. I sent it to ICOM to be repaired, but they didn't fix it. It turned out to be a cold solder joint in the bias circuit for the final amplifier. The final was running class C instead of class AB linear for SSB. I checked the transmitted audio because a ham in Bermuda said my audio sounded like goat droppings; it did. Lesson learned: monitor your transmitted audio before assuming it's OK.

If you can not measure it, you can not improve it.
Lord Kelvin, 1883
www.megalithia.com/elect/aerialsite/dttpoorman.html

Last edited by rabbit73; 12-05-2018 at 09:41 AM.
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post #26 of 27 Old 12-11-2018, 08:22 AM
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Interference problems can be difficult to solve, and sometimes require more than one fix at the same time. I started experimenting with antennas when I was 8 years old. I'm now 85 and still learning. The biggest trap in troubleshooting is assuming what couldn't be causing a problem without verifying by test.

I had an ICOM 735 transceiver that was causing TVI. I sent it to ICOM to be repaired, but they didn't fix it. It turned out to be a cold solder joint in the bias circuit for the final amplifier. The final was running class C instead of class AB linear for SSB. I checked the transmitted audio because a ham in Bermuda said my audio sounded like goat droppings; it did. Lesson learned: monitor your transmitted audio before assuming it's OK.
Thank you again on your insights, I'll find the means to report what fixes this over time which I lack right now, but was concerned I had a possible defective Roku device. I'm thinking proximity to the tuner board/or something getting into the set (shielding)? I had a issue years ago with the Zenith DTV converters not powering in a cold room & was able to finally isolate it down to one bad/undersized cap.

Impressive your keeping up well, I change the subject when around my octogenarian dad when he brings up he is thinking about getting the internet installed. I'm an off the air Ham myself, just lack the time for it over the last 15-20 years.
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post #27 of 27 Old 12-11-2018, 08:57 AM
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Originally Posted by Bismarck440 View Post
Thank you again on your insights, I'll find the means to report what fixes this over time which I lack right now, but was concerned I had a possible defective Roku device. I'm thinking proximity to the tuner board/or something getting into the set (shielding)? I had a issue years ago with the Zenith DTV converters not powering in a cold room & was able to finally isolate it down to one bad/undersized cap.

Impressive your keeping up well, I change the subject when around my octogenarian dad when he brings up he is thinking about getting the internet installed. I'm an off the air Ham myself, just lack the time for it over the last 15-20 years.
Thank you for your kind words. Trying to solve reception problems keeps my mind active; it's the challenge of a puzzle.

If you find a solution, please post it on this thread.
DrDon, djb61230 and nathill like this.

If you can not measure it, you can not improve it.
Lord Kelvin, 1883
www.megalithia.com/elect/aerialsite/dttpoorman.html
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