Diplexer - Televes vs Alcad

[hgg]

Hello everyone,

I am trying to decide between two diplexers and I was wondering if anybody in the forum had
any experience with either of the following:

a) Televes 7452
http://www.televes.com/en/catalogo/producto/combiner-matv-if-5862-9502050mhzdc


b) Alcad ME214
http://www.alcad.net/uploads/fichas/9020015ti.swf


I have been using for many years products from Televes and they are of great quality but this
diplexer from Alcad has better specs and lower price.  Lower insertion loss, higher frequency
and higher IF rejection.

Are these specs 'Chinese'?...

Has anybody tried any of the above diplexers?
Any comments on the quality of other Alcad products?

Thank you!
George.

[uncle_bob]

Hi

Is this a one off buy or are you switching out a bunch of them? If you are doing a system switch out ( = buying a lot of them), I'd get one and leave it out in the rain for a few months to see how it does in the real world....

Bob

[hgg]

I will buy just a pair of them and I will use them inside the house.
I am trying to combine a terrestrial analog TV signal with the output
of a MoCA adapter that carries ethernet data and pass them through
a single Coax cable.   I am not sure if it will work.

[uncle_bob]

Hi

For indoor use, I'd bet that either of them will run for a long time. It has been a while since I put the MOCA stuff in the house here. I don't recall having to do diplexers in that case. I put blocking filters on to prevent upstream feed, but that was about it.

Bob

[NiHaoMike]

Rather than spend a lot on MoCA stuff, you can try running Wifi over the coax line.
http://wifiovercoax.mcleodnet.com/

[uncle_bob]

Rather than spend a lot on MoCA stuff, you can try running Wifi over the coax line.
http://wifiovercoax.mcleodnet.com/

Hi

That's a good point. In my case the MoCA stuff was "free". It came built into some boxes and there was nothing else I needed to buy. If I had to pay to put it in, I would try something else.

Bob

[hgg]

@uncle_bob  Do you mean preventing upstream feed to the terrestrial aerial ?

@NiHaoMike I already have a Netgear MoCA adapter running for years without a problem.
I just want to use a single coax to combine the MoCA signal with an analog TV signal.

[uncle_bob]

@uncle_bob  Do you mean preventing upstream feed to the terrestrial aerial ?

@NiHaoMike I already have a Netgear MoCA adapter running for years without a problem.
I just want to use a single coax to combine the MoCA signal with an analog TV signal.

Hi

I have a fairly strange system. I run both cable and over the air. The filters were first for blocking back feed to the cable. I then put them into the antenna system as well. I very much doubt they are needed for the antenna. In both cases, the function is mostly to keep the neighbors out of your system (and you out of theirs).

Bob

[hgg]

I see.  I've heard that if you don't mix the signals properly you might cause interference from your
TV aerial to police/fire etc communication.  I am not sure if its possible.
Do you have any link to see these blocking filters or similar?
Thanks.

[uncle_bob]

I see.  I've heard that if you don't mix the signals properly you might cause interference from your
TV aerial to police/fire etc communication.  I am not sure if its possible.
Do you have any link to see these blocking filters or similar?
Thanks.

Hi

It is technically possible to radiate a MoCA signal from your over the air antenna. With the particular antenna I have, that was not a big worry for me.

Here's what I bought:

http://www.amazon.com/Filter-MoCA-Cable-Coaxial-Networking/dp/B00DC8IEE6

I can't say that I put a lot of thought into selecting this one. There may be better / cheaper / quicker solutions out there.

Bob

[hgg]

I see.  I've heard that if you don't mix the signals properly you might cause interference from your
TV aerial to police/fire etc communication.  I am not sure if its possible.
Do you have any link to see these blocking filters or similar?
Thanks.

Hi

It is technically possible to radiate a MoCA signal from your over the air antenna. With the particular antenna I have, that was not a big worry for me.

Here's what I bought:

http://www.amazon.com/Filter-MoCA-Cable-Coaxial-Networking/dp/B00DC8IEE6

I can't say that I put a lot of thought into selecting this one. There may be better / cheaper / quicker solutions out there.

Bob

I see.  This is for cable tv.  I am using the moca adapter to pass only network data through coax and now I want to mix an analog tv signal as well.

[uncle_bob]

I see.  This is for cable tv.  I am using the moca adapter to pass only network data through coax and now I want to mix an analog tv signal as well.

Hi

I have no idea what the "cable only" thing is about. It blocks the MoCA and passes the frequencies that I get over the air TV on. There may be a big brother to this that has more attenuation. They also may be talking about it blocking satellite hookups.

Bob

[hgg]

If I understand correctly, this is a low pass filter and I don't need to use it because I will be
using one diplexer in each end.

[uncle_bob]

If I understand correctly, this is a low pass filter and I don't need to use it because I will be
using one diplexer in each end.

Hi

Exactly correct. You already have low pass filters in the diplexers.  In my case I did not need diplexers on the gear I had. The only requirement was for blocking filters at the "ends" of the system.

Bob

[hgg]

Great,  thanks for your help!