Head End Digital

joeaverage

Hello,

I have used a single version of this unit (Pro Single), which converts up to eight satellite channels to DVB, using one tuner and up to 4 different satellite transponders.

This unit (Pro Quad)claims to be capable of converting up to 32 channels. Are these 32 channels limited to only 4 transponders as the spec suggests, or can each on the individual 4 tuners be set up with 4 different transponders. Obviously the latter would give a wider channel choice. Any help much appreciated.

Peter Rhea

If the single-tuner version can demodulate channels from 4 different tps, how do you make it that a 4-tuner version will also be limited to only 4 tps?

Do you have a link to a manufacturers site or even the manufacturer's name?

joeaverage

Product info here

http://www.johansson.be/en/products/CAT/DMH/DRMD/5302Q.html

The spec suggests that the module can use only 4 transponders ( maybe they mean four bands VHS,VL,HH,HL), this is the case with the single version, which is fine considering it only converts up to eight satellite channels, eight channels from four transponders is fine for most applications, but if the 32 channel module can only convert channels using only four transponders, it wouldn't be much use.

Peter Rhea

This would be the ProSingle you refer to in your OP? http://www.johansson.be/en/products/CAT/DMH/DRMD/5303S.html

Actually has 4 satellite tuners like the ProQuad, the 'Single' part referring to the fact it outputs a single COFDM mux. whereas, the Quad outputs 4 muxes?

I kinda forgot a single tuner can only handle 1 tp anyway.

joeaverage

So you reckon it can only use four tps then, pity as this would seriously limit the channel choice. 32 channels from four tps would be a struggle.

Peter Rhea

It's a modular system. Use 2 of the twin versions or 4 of the singles or any combination you like.

byte

joeaverage wrote: »

Product info here

http://www.johansson.be/en/products/CAT/DMH/DRMD/5302Q.html

The spec suggests that the module can use only 4 transponders ( maybe they mean four bands VHS,VL,HH,HL), this is the case with the single version, which is fine considering it only converts up to eight satellite channels, eight channels from four transponders is fine for most applications, but if the 32 channel module can only convert channels using only four transponders, it wouldn't be much use.

Yeah, seems it can only handle 4 Transponders. Peter is right, you need more single or twin modules if you want a more varied channel output.

joeaverage

thanks for that, that's what I thought,must be geared more towards German or other markets with such a limitation on the quad module, yea perhaps a couple of twins and a single would be more suitable & costly!!!

Peter Rhea

It's not a limitation. You're missing the whole point of a modular system i.e. being able to 'mix & match' to customise your system. You don't expect a single module to do everything you want.

joeaverage

No, I think I've got it, 32 channels, but only from 4 different transponders, from the pro quad module, (leaving aside other modules) serious limitations considering you often don't get eight different channels on one tp, let alone eight that you actually wanted!

Peter Rhea

Look up the definition of 'module' or 'modular'. The whole idea is to allow flexibility in the system design. If the quad-tuner, 4 mux. transmodulator doesn't allow the channel lineup you want, then don't use it.

For more tps, you need more tuners & that means more modules, or something like the 'Digital Compact Headend', which has 8 tuners.

Either that or look at other manufacturers. Triax range has separate demodulators & modulators, rather than both being in the same module.

joeaverage

Yea, I've got all that thanks, but what in the name of god would anyone want a pro quad unit for considering its LIMITATIONS/ SHORTCOMINGS with regard to the number of transponders available for a 32 channel module.

Peter Rhea wrote: »

Look up the definition of 'module' or 'modular'. The whole idea is to allow flexibility in the system design. If the quad-tuner, 4 mux. transmodulator doesn't allow the channel lineup you want, then don't use it.

For more tps, you need more tuners & that means more modules, or something like the 'Digital Compact Headend', which has 8 tuners.

Either that or look at other manufacturers. Triax range has separate demodulators & modulators, rather than both being in the same module.

joeaverage

Peter, fortunately I do know what the word modular means. Is there any need for this kind of comment?

Thanks for your help anyway, and for completely missing the issue here!

Peter Rhea wrote: »

Look up the definition of 'module' or 'modular'.

Peter Rhea

joeaverage wrote: »

. . . what in the name of god would anyone want a pro quad unit for considering its LIMITATIONS/ SHORTCOMINGS with regard to the number of transponders available for a 32 channel module.

Maybe Johansson could better answer that question? I'd doubt they make them for the fun of it.

I didn't miss your 'issue' here. Were you expecting me to agree with your seeming view that the ProQuad COFDM 32 is a pointless product, just because it doesn't do what you want it to do?

The Cush

joeaverage wrote: »

but what in the name of god would anyone want a pro quad unit for considering its LIMITATIONS/ SHORTCOMINGS with regard to the number of transponders available for a 32 channel module.

It's probably cheaper than 4 single or 2 twin tuner units for the same number of transponders and takes up less space in rack. Maybe in future they will add 8 or 16 tuner models to their range.

The product is probably more for the hotel, apartment block market etc. rather than a domestic installation, where a limited number of channels may only be required via a single cable direct to the TV tuner.

What would be the cost of the quad unit + rack+ power supply +cooling fan?