Diplexer

fernrock

I have fitted a diplexer/combiner to combine and seperate my satellite and saorview aerials. while the satellite feed is perfect ,I am only getting some of the saorview channels , RTE1 UTV and RTE Jnr. Is there any reason for this.

If I feed my saorview aerial directly to my TV, bypassing the diplexer I have perfect signals on all channels.

Thurston?

Most likely, your Saorview signal is actually poor (despite the onscreen result or TV signal meter indication), with the RTE2 etc. multiplex (mux. 1) becoming unusable when passed through the diplexer, due to the small through-loss &/or possible interference from the satellite LNB that isn't being fully filtered out.

Unless the diplexer by some quirk is letting through a particularly large amount of interference in your mux. 1 frequency band, & could possibly be alleviated by changing the type of diplexer, you're just looking at improving the Saorview signal.

What kind of aerial setup do you have?

fernrock

I am using a "Konig" diplexer/combiner.

My saorview aerial is in the loft so, I guess that could be the problem.

Thurston?

Yeah, I'd say it's just a signal deficiency, rather than the specific diplexer performing much differently to others that are commonly used for this function.

In the loft, generally the higher the aerial is mounted, the better, & 'looking' through as little solid matter as possible. (Roof usually being preferable to wall, & certainly nothing metal or containing water.)

Don't forget, if more than 1 transmitter is available in your area & you have a suitable aerial, try the alternatives, rather than just take the Saorview coverage checker as gospel.

The Cush

Thurston? wrote: »

Don't forget, if more than 1 transmitter is available in your area & you have a suitable aerial, try the alternatives, rather than just take the Saorview coverage checker as gospel.

At 18kms Cnoc An Oir is the closest to him, it's receivable 40kms away in Miltown Malbay

fernrock

Thanks for all your help folks.

Problem solved.

Turned the aerial approx 20 deg , all now perfect.

Antenna

You are better off running separate cables if possible, rather than using diplexers.

Diplexers are not compatible with Sky Q LNBs.

What if FTA satellite receivers IN THE FUTURE also used Sky Q type LNBs?

If receiving terrestrial on higher UHF channels (in the 50s) the loss may be particularly significant using diplexers,

The extra few dB of signal by not using diplexers might be of benefit in the future if signal strength reduces due to other reasons (such as tree growth in the path of the signal)

fernrock

Thanks for the info but, in this case I am only running a "backup" saorview feed internally to another room. I have managed to feed two cables (for LNBs ) through the internal walls without disturbing the decorating. So, it is not worth the trouble involved in chasing/redecorating for just the backup feed.

Thurston?

For me, the main issue with these sat./terr. diplexers, apart from possible future compatibility problems mentioned above, is that most have no capability to pass power on the terrestrial side (Televes do or did make one that could), so if your signal is a bit iffy, you can't use an amplifier upstream of the diplexer, but with its power supply downstream of the diplexer, say plugged in at one of the TV points.

This mightn't be a problem with your attic installation, if power is available in the attic, but would be a different matter if the diplexer is outdoors.