Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old February 11th 20, 08:44 PM posted to sci.electronics.repair
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Default Distiibution amplifier vs. ????

I think I need a new amplifier for the signal from my DVDR output to
various tv's, but I forget what that thing is called. ???

When I look up distribution amplifier, they seem to be from the antenna
to the TV, and aren't those different frequencies.

The 110volt amp is still a little warm, but I suppose after 35 years of
use without interruption, it could have failed. It's mark is Archer,
which was Radio Shack, but I know the very same thing was sold under
other brands.

Am I better off with 110vac or with one that uses a 12v wall wart?

TIA

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Old February 11th 20, 09:21 PM posted to sci.electronics.repair
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Default Distiibution amplifier vs. ????

Wired? Those would be HDMI extenders:

https://www.youtube.com/watch?v=KNP1MmtfpqU

Wireless? Same name, but a bit more expensive.

https://www.youtube.com/watch?v=Kdpewy7-QQ4

I am linking to You-Tube rather than specific hardware as I am not quite sure what you actually want.

Writing entirely for myself, I would lean towards something driven by a wall-wart as it removes the complexity of a power-supply (and the associated heat) from the actual system.

Peter Wieck
Melrose Park, PA
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Old February 11th 20, 09:58 PM posted to sci.electronics.repair
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Default Distiibution amplifier vs. ????


In article ,
micky wrote:
I think I need a new amplifier for the signal from my DVDR output to
various tv's, but I forget what that thing is called. ???

When I look up distribution amplifier, they seem to be from the antenna
to the TV, and aren't those different frequencies.


It would help us a lot to answer your question accurately, if you
actually described what sort of signal you are distributing to the
TVs. There are at least 3:

(1) Composite video, plus audio (typically two or three 75-ohm coax
cables ending in RCA plugs... video is yellow, audio is typically red
and black).

(2) S-Video, plus audio (similar to the above, but the video signal is
multiple wires in a cable that ends in a DIN connector).

(3) "RF modulated", where the signal goes into the remote TVs' antenna
inputs, and the TVs are tuned to challen 3 or 4 (typically).

(4) HDMI (digital).

For (1) you would want a "composite video and stereo audio"
distribution amplifier (Markertek has the CE Labs AV400, which will
feed up to 4 TVs). For (2) you'd want a similar device with S-Video
rather than composite (I don't have a specific one to recommend). For
(3) an ordinary broadcast-TV distribution amplifier such as you've
already found should work, since in this case you _are_ distributing
TV signals. For (4) you would need an HDMI distribution router (which
isn't just an amplifier).

The 110volt amp is still a little warm, but I suppose after 35 years of
use without interruption, it could have failed. It's mark is Archer,
which was Radio Shack, but I know the very same thing was sold under
other brands.


After that many years, it would not be surprising if some of the
filter capacitors have dried out and failed. It might be repairable,
but unless you are trained and skilled in such it might be
uneconomical.

Am I better off with 110vac or with one that uses a 12v wall wart?


In cases like this I think a wall-wart system might give better
reliability, because it keeps the heat from the power supply out of
the amplifier enclosure.


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Old February 11th 20, 11:46 PM posted to sci.electronics.repair
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Default Distiibution amplifier vs. ????

On Tuesday, 11 February 2020 20:58:27 UTC, Dave Platt wrote:

It would help us a lot to answer your question accurately, if you
actually described what sort of signal you are distributing to the
TVs. There are at least 3:


why do so many questions omit the basic essential information?
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Old February 12th 20, 12:12 AM posted to sci.electronics.repair
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Default Distiibution amplifier vs. ????

On 11/02/2020 19:44, micky wrote:
I think I need a new amplifier for the signal from my DVDR output to
various tv's, but I forget what that thing is called. ???

When I look up distribution amplifier, they seem to be from the antenna
to the TV, and aren't those different frequencies.

The 110volt amp is still a little warm, but I suppose after 35 years of
use without interruption, it could have failed. It's mark is Archer,
which was Radio Shack, but I know the very same thing was sold under
other brands.

Am I better off with 110vac or with one that uses a 12v wall wart?

TIA


Hi Micky,

I'm going to guess given the age, that this is RF distribution at either
channel 3 or 4 (US), so yes you are looking at a antenna distribution amp.

Way back then too, the power supply would have been a transformer, and
supplying not much current would have helped it's longevity.

However, if all of your TVs are now digital, there are much better ways
of distributing content.

HDHomeRun for one.
https://www.silicondust.com/

--
Adrian C


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Old February 12th 20, 01:20 AM posted to sci.electronics.repair
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Default Distiibution amplifier vs. ????

In article ,
wrote:
On Tuesday, 11 February 2020 20:58:27 UTC, Dave Platt wrote:

It would help us a lot to answer your question accurately, if you
actually described what sort of signal you are distributing to the
TVs. There are at least 3:


why do so many questions omit the basic essential information?


An overly optimistic expectation about the efficiency of telepathy,
clairvoyance, and the hackability of home security cameras? :-)

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Old February 12th 20, 02:03 AM posted to sci.electronics.repair
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Default Distiibution amplifier vs. ????

In sci.electronics.repair, on Tue, 11 Feb 2020 23:12:22 +0000, Adrian
Caspersz wrote:

On 11/02/2020 19:44, micky wrote:
I think I need a new amplifier for the signal from my DVDR output to
various tv's, but I forget what that thing is called. ???

When I look up distribution amplifier, they seem to be from the antenna
to the TV, and aren't those different frequencies.

The 110volt amp is still a little warm, but I suppose after 35 years of
use without interruption, it could have failed. It's mark is Archer,
which was Radio Shack, but I know the very same thing was sold under
other brands.

Am I better off with 110vac or with one that uses a 12v wall wart?

TIA


Hi Micky,

I'm going to guess given the age, that this is RF distribution at either
channel 3 or 4 (US),


Yes, you're right.

Sorry, Dave, eiither I forgot how many other ways there were, or I
incorrectly assumed that only your method 3, RF modulated, would involve
anything like a distribution amp.

so yes you are looking at a antenna distribution amp.


I set this up when the PCJr as the go to computer, and I had no internet
and I don't know how I decided what to buy.

So later I thought there were different amps for the antenna versus the
between the VCR and the remote tvs. But I guess I jumped to the wrong
conclusion.

Way back then too, the power supply would have been a transformer, and
supplying not much current would have helped it's longevity.

However, if all of your TVs are now digital, there are much better ways


None of them are digital. I was thinking of getting one, but I have no
room for a large screen. 22" is about all I have room for or a little
bigger. That woudl still leave 3 rooms with analog, whose signal is
provided by the DVDRhd, which has a digital tuner. (I use powermids to
control the dvdr from other rooms.)

of distributing content.

HDHomeRun for one.
https://www.silicondust.com/


That looks pretty good. I wish I'd put ethernet in all the rooms when I
put in the coax, but I guess I could use wifi if I had a tv that could
accept that. Maybe later. I may be getting a 50-year roof so I'll have
to live her 50 more years to get my money's worth.
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Old February 12th 20, 02:04 AM posted to sci.electronics.repair
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Default Distiibution amplifier vs. ????

In sci.electronics.repair, on Tue, 11 Feb 2020 12:58:18 -0800,
(Dave Platt) wrote:


In article ,
micky wrote:
I think I need a new amplifier for the signal from my DVDR output to
various tv's, but I forget what that thing is called. ???

When I look up distribution amplifier, they seem to be from the antenna
to the TV, and aren't those different frequencies.


It would help us a lot to answer your question accurately, if you
actually described what sort of signal you are distributing to the
TVs. There are at least 3:

(1) Composite video, plus audio (typically two or three 75-ohm coax
cables ending in RCA plugs... video is yellow, audio is typically red
and black).

(2) S-Video, plus audio (similar to the above, but the video signal is
multiple wires in a cable that ends in a DIN connector).

(3) "RF modulated", where the signal goes into the remote TVs' antenna
inputs, and the TVs are tuned to challen 3 or 4 (typically).

(4) HDMI (digital).

For (1) you would want a "composite video and stereo audio"
distribution amplifier (Markertek has the CE Labs AV400, which will
feed up to 4 TVs). For (2) you'd want a similar device with S-Video
rather than composite (I don't have a specific one to recommend). For
(3) an ordinary broadcast-TV distribution amplifier such as you've
already found should work, since in this case you _are_ distributing
TV signals. For (4) you would need an HDMI distribution router (which
isn't just an amplifier).

The 110volt amp is still a little warm, but I suppose after 35 years of
use without interruption, it could have failed. It's mark is Archer,
which was Radio Shack, but I know the very same thing was sold under
other brands.


After that many years, it would not be surprising if some of the
filter capacitors have dried out and failed. It might be repairable,
but unless you are trained and skilled in such it might be
uneconomical.

Am I better off with 110vac or with one that uses a 12v wall wart?


In cases like this I think a wall-wart system might give better
reliability, because it keeps the heat from the power supply out of
the amplifier enclosure.


Thanks. Also replied to in my othe reply.
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Old February 12th 20, 12:26 PM posted to sci.electronics.repair
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Posts: 11,325
Default Distiibution amplifier vs. ????

On Wednesday, 12 February 2020 00:20:25 UTC, Dave Platt wrote:
In article ,
tabbypurr wrote:


why do so many questions omit the basic essential information?


An overly optimistic expectation about the efficiency of telepathy,
clairvoyance, and the hackability of home security cameras? :-)


It seems to go even furhter than that.
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