Jim104 - 40 mins ago »
Thank you all for the useful information in your replies.
Graham - the aerial is in the loft and is in line of sight of the transmitter.
I tuned to Lcn 107 and the test signal returned 30% strength and 100 % quality. Chn 55 746000 kHz DVB-T2 8 MHz auto.
I cannot see the colour of the end plug as its attached to a splitter box high up under the eaves.
Mars - The aerial was already installed at the house when I moved in 6 years ago. The main aerial feed goes through a splitter box (non powered) and feeds two other aerial points of which one is connected to a tv which receives signals and pictures satisfactorily. I previously had a humax box the one with two tuners, I never experienced picture breakup on that one and was looking (then) at the same channels as I am now, thats why this is baffling me.
James
Passive Splitters reduce the signal level.
https://www.aerialsandtv.com/knowledge/splitters-amps-and-diplexers/aerial-splitters#splitter-loss
Check external coax cables carefully for damage to the outer cover. If they are not properly secured over edges wind movement can abrade the outer covering and let in water. This is particulary bad where the coax uses air spaced dialectric rather than solid foam.
Water greatly increases the cable losses. If you can replace external cables with double screened satellite grade Webro WF100 terminated using f connectors and water proof using silicon grease.
You can get f to Belling Lee adaptors where you need them
https://www.amazon.co.uk/dp/B00LGWN814?tag=amz-mkt-chr-uk-21&ascsubtag=1ba00-01000-a0027-win10-other-nomod-uk000-pcomp-feature-scomp-wm-5&ref=aa_scomp
The end plug is on the aerial which you can presumably get to in the loft. They are pushed in to the open end of the boom. Group A aerials generally have a black plug. If I remember correctly wideband aerials use blue plugs.
See the gain of different aerials. The UHF carrier frequency is at the bottom of the graph
https://www.aerialsandtv.com/knowledge/aerials/atvs-aerial-gain-tests/atv-aerial-gain-tests-all-the-gain-curves
The DM log I recommended is the black dotted line.
| Tue 5 Jan 2021 11:07:30
#42 |
