going back to the CRT and geometry issue, although I thoght the Sony CRT we had was very good indeed, it had no adjustment for geometry (this was only on more expensive Sonys from memory). So anything with black bars had a slight tilt and there was nothing to be done - but I have to say, most people I know would not even notice such things as they are mostly very slight. But with LCD its no longer an issue and one less thing to bug me.

I posted this on another thread - are we refring to the same thing?
not sure if a anyone else noticed, but CH4 HD on freesat needs a strong signal to avoid picture breakup. I noticed a couple of times when I had my old LNB a few bits of pixels even though signal bar was about half way. Now the LNB is changed and was aligned with signal meter, I am getting very nearly full signal bar on this channel and no pixel problems at all. Maybe the DVB-S2 signal that CH4 hd uses is less stable in some way? Prior to the LNB change other SD channels were fine working ona half signal bar reading-only giving out when the bottom of the scale was reached.

The only explanation is that either there is already enough headroom for one 3D channel on both Freeview and Freesat, or bitrate from another channel has to be robbed for the 3D/HD channel.

I suspect the first because in the case of Freeview the capacity has to come from a 40Mbps mux already running four streams with an unknown (to me) null packet rate. Freesat has a vacant fourth HD stream so has plenty of bitrate available.

If more bitrate is required, in the case of Freeview, the only source of more capacity is BBC One HD or any null packets available or perhaps cutting data or audio streams like ALBA in Scotland.

In the case of Freesat there is plenty of unused capacity. But why would the BBC implement a different solution for DTT and satellite when both platforms have 4 HD stream capability out of a 40mbps transport stream? The conversion to S2 would allow the BBC to run an HD interactive red button channel for Wimbledon as well as a 3D trial before using it for other purposes.

No - the reason is, in fact, that a nearby satellite uses a similar frequency for one of its transponders, so alignment is more important to reduce the effect of the interference from the other satellite.

What is the position of the other Sat in question? - my dish was able to pick up channels on BADR (@ 26deg) when I used a cheap FTV box - do I need to tweak the dish direction to a higher easting?

The Dish is oval - to give a wider E-W spread than a round dish would give (??)

I noted earlier that "nhk Worldwide HD" is also bad (but not so bad) does the same "co-channel" (or "co-frequency") problem arise - or is its problem only because of the particular settings it shares with CH4 HD ?

Are there other Freesat and FTV channels that are similarly affected by "co-channels" (to try and tie down the problem) ?

I can't actually remember, but it may well be - I'll wait until someone more knowledgeable confirms.

Oval (Sky style) dish has less E-W spread than N-S ... it's effectively a bigger dish in the E-W and thus has a narrower beam width that way.

Small dishes run the risk of "seeing" the satellite next to the one you want, as they are commonly only a couple of degrees apart.

See http://www.lyngsat.com/europe.html

I have copied my posts re Ch4 HD (and Muzers replies) to a thread on Freesat+ which is more appropriate.

pvr101novice I have a conventional 60cm 'round' solid dish that is slightly oval - higher by a couple of inches than wide - not the 'Sky' radar style dish.

AFAIK

BBC HD services on Freesat went S2 earlier this month, so there's more bitrate there than there was.

Freeview HD is on T2 to provide the bandwidth needed for HD in a standard 8meg UHF channel, and I suspect the 3D will effectively be 2 x 720 - two pictures side by side, as the resolution is currently 1440


We'll have to see what actually happens though...

The BBC's DVB-S2 transponder has approximately the same capacity as the DVB-T2 Freeview mux. The DVB-S2 transponder has enough null packets for a fourth stream (it currently has three), and the DVB-T2 multiplex already has four streams, so they are essentially configured the same.

The BBC have stated that BBC HD on all platforms will increase its resolution to 1920 for a period before and after the trial.

All platforms will use the side-by-side viewing standard, including Freeview, putting effective resolution for one image at 960x1080 on all platforms.

According to http://www.digitalbitrate.com/dbr.ph...note=0&lang=en the two BBC HD video streams are each accounting for ~23% of the S2 transponder with the ITV1 HD stream on ~15% leaving ~30% of null packets (the rest is audio and data). That is plenty of room for a fourth HD stream regardless of whether the BBC are using 3D or not.

Hope someone can help .Since BBC changed their settings to 'DVB-S2' my passion plus Hd box keeps crashing .At one point the flipin thing ended up in a continuous reset loop.Only way i found to overcome it was to go back to a really old version of firimware...Manged to fix it of sorts .If I want to change channels from BBC1HD or BBCHD I have to select radio, box then crashes resets to Radio1 and from there I can select ITV etc ,tearing my hair out ,can anyone help.tried emailing Fortec technical support was told to rescan grrrrrrrrrrrrr (i had spent 2.5 hours rescaning the flipin thing last night) with crash after crash