Any hints/tips on using the RF link amp in a digital TX world ?

Has anyone succeeded (or failed) in get a digital transmission relayed via a BV to a link room BV.

It is slowly dawning on me that this might be a fail despite some partial successes ......

You can run HDMI over RG6 or RF cables with an adapter at each end. I am looking into this myself.

http://www.hdtvsupply.com/hdmiovercoax.html

cheers, beoaus

Hi, yes it can be done - I have managed it with apple TV and my BV8 - what you do is insert a splitter onthe HDMI cable that splites the HDMI into two - one port goes to the HDMI port on the BV8 the second goes to an HDMI converter to Video and Audio which then goes to teh SCART socket on the BV8, socket is configured as V.Mem and to use HDMI and IR to control it - on the BV8 it displays in HDMI and on the link TV's they get their source via the SCART/RF output on BV8 - works really well the cost of the converter/splitter around £40 on Amazon.

Those are good ideas.

However I should have been more clear.

I already have a B&O RF Modulator. Which is an ugly black lump with six coax ports and which makes use of B&O's BV link room tuning.

My set-up worked ... but we did not make great use of it. So when it started having intermittent problems I was not fussed.

I even went as far as trying to de clutter and removed the device.

So I then tried using a simple (yet professional) RF aerial splitter but that seemed worse ! Looking at the signal strength on the BV menu I realised that I had been undone by the switch of broadcasts from analogue to digital. The simple splitter and it's long coaxial run was generating so many bit errors that the link BV could not latch onto the signal.

Relocating the link BV next to the master for tests has highlighted that with the simple splitter the type of coax being used makes the difference on a one metre run of it working or stuttering / juddering every 5 or 10 seconds.

So muggins thought he could reintroduce to modulator to "amplify" the RF signal.

Not so good ! Almost unwatchable !!

I am now wondering if the RF modulator can only work with an analogue TV aerial signal and the switch to digital transmission (TX) has made the RF modulator useless

elephant:

I already have a B&O RF Modulator. Which is an ugly black lump with six coax ports and which makes use of B&O's BV link room tuning.

This isn't a RF modulator... the RF modulator is built into Beovisions.

This box is an RF link amplifier. Answers above are correct but do talk about the modulator, not this amplifier.

You'll find some info regarding that box here, but it's likely to be older than DVB-T signals : http://archivedarchivedforum2.beoworld.org/forums/p/3316/293786.aspx

At home I use this box and the DVB-T signals goes though it just fine, however, I do not know if the digital signal in AUS is of the same nature...

http://www.directcoms.co.uk/SY-M388.html

This connects to a product with hdmi then sends out both hdmi and an analogue output. Then the main TV can receive hd whilst receiving the "yellow, white and red " connections that can be modulated around the system.

Thanks again everyone - and Philippe is correct with his photo.

There are two types of these boxes part no 1405266 aka 4052 and no 1405366 aka 4053 (with return path).

There is also a galvanic isolator for use with cable networks.

It turns out mine is a 4052. But I am greatly encouraged that Philippe's does work (albeit I am mindful of his caveat).

I shall keep experimenting ...

FYI here is the wiring diagram for installing this little beast

(I must the importance of the return path is completely lost on me since there so be no difference in usage!)

PhilLondon:

This box is an RF link amplifier. Answers above are correct but do talk about the modulator, not this amplifier.

At home I use this box and the DVB-T signals goes though it just fine, however, I do not know if the digital signal in AUS is of the same nature...

Philippe - could you help me with where you plug your DIGITAL aerial into (2nd from the left) ?

where you relay the DIGITAL signal to (from TAP 1 (bottom left)) to DVB in on the master BV (DVB in) ?

whether the RF modulator relays a DIGITAL signal to the modulator in (top left) ?

or is the relay now ANALOGUE (having been transformed by the master BV's video processor) ?

whether the TAP (2 to 34) for the link room is plugged into the receiving BV's digital DVB port or analogue aerial port ? 

Hi,

the RF Link from the TV and the aerial line in are always analog High Frequency signals which are modulated in a certain manner (mostly AM with a FM modulated subcarrier for the audio portion when used for analog transmissions).

When you receive a digital transmission the content is modulated on an analog High Frequency signal  as a carrier. This carrier is what goes from the aerial (or cable network connection) to the receiver which is mostly a settop box. This settop box has an analog frontend to tune onto the carrier frequency. What goes out from the frontend is the raw modulation which will be interpreted as the digital payload being processed by more or less specialized chip giving an analog picture to SCART connector or RCA jacks and/or a digital picture signal to a digital connector DVI (older) or HDMI. Also possible is a HD picture presented at analog outputs with the coding of 'Y Pb Pr' but this is a bit seldom.

 

So using the B&O Link amp should also work with the Link signal because the RF Link-out connector always gives an analog signal with an analog content to the coax cable. The link TV receives an analog content.

You can assume a completely anlog receiving for setup the correct wiring because the settopbox sits 'behind' the RF Link amp and if the settopbox gives a nice picture everything is fine.

Hope this helps a bit to demistify those digital receivings. Btw. SAT receiving is also analog receiving with a digital payload :)

 

Thanks Ralph-Marcus

That was much as I had expected however I continue to be puzzled by this box

I should have know better than dismantle the installation !

I took me a long time (with Philippe's help) in 2009 to get it working !

 

I have tried again today - using the principles you have outlined - but still I am not having success.

Nonetheless thank you for taking the time to respond.

elephant:

Philippe - could you help me with where you plug your DIGITAL aerial into (2nd from the left) ?

Hi, I am not ignoring you but I am away from home with little access to the internet.

If you haven't solved your problem in 2 weeks, contact me directly.

Ed, I have the amplifier/modulator in place. Feel free to give me a call.

Beoaus

beoaus:

Ed, I have the amplifier/modulator in place. Feel free to give me a call.

Beoaus

Thanks !

And thanks also Philippe - I will give BeoAus a call probably cost me a

Hello,

I have to make two comments regarding the RF-Link-Amplifier:

1. Don't connect a digital tuner to the amplifier, only analogue tuners work flawlessly.

2. If you want to connect only one Link-TV to Main-TV you don't need the amplifier!

Before I got my BV 7 I used an old Avant. I connected the Avant with BV 10 in link room directly via antenna cable and it worked perfect.

In all manuals and also here in this forum it was mentioned that you need the RF-Link-amp if you have a newer Beovision in main room. So I used this ugly black box. A few months ago I discovered a very long antenna cable in my loft. I tested to connect BV 7 and BV 10 with this cable and it worked also perfect without any loss of picture quality. That's why I sorted out this ugly black box then.

I assume only if you want to connect more than one Link-TV by using antenna cable splitters you need the RF-Link-amp to avoid loss of picture quality.

Hope this helps...

Regards

Räuber

Thank you Räuber

that more or less confirms my experiences.

And originally all I wanted was 1 link room -- so it was a wasted expense, and became unused.

However as part of trying to make a decision about the new Avant and the coexistence of the two old BV8s I thought I would do some experiments.

The conclusion I have reached is that either:

a) the old BV8s just become monitors driven my Apple TVs on which we watch movies or play catch up with various iApps, and/OR

b) I get an aerial amplifier (like the aerial installer suggested !) and run long cables to the three rooms, and/OR

c) get additional subscription boxes from FOXTEL . . . .  

 

It is "lucky" I am now so busy at work that I don;t have time to experiment and investigate and spend more money