All posts by Gwyn
Below are all of Gwyn's postings, with the most recent are at the bottom of the page.
G
Llanddona (Isle of Anglesey, Wales) Full Freeview transmitterTuesday 12 April 2011 9:10PM
Caernarfon
Is this too much gain from the aerial itself, the masterhead amplifier is suppose to give the correct ouput regardless of signal strenght.
thanks
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G
Llanddona (Isle of Anglesey, Wales) Full Freeview transmitterTuesday 12 April 2011 9:17PM
Caernarfon
If I bypass the Distribution amplifier that supplies the aerial with 12volts and connect the panasonic directly, is this worth a shot??
thanks
Gwyn
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G
Llanddona (Isle of Anglesey, Wales) Full Freeview transmitterWednesday 13 April 2011 7:01AM
Caernarfon
Yes it does, but if no 12v is present at the masterhead amplifier the Televes masterhead amplifier would only be used as a loop through device in my understanding. i.e. no gain to compensate for the lenght of cable to the distribution amplifier. The most important factor is the gain of the aerial, this is around 16dB, if you amplify the signal you also amplify any noise picked up by that aerial.
Just going to try this with the masterhead off (acting as a loop through device) and feeding the aerial output to just one television just to prove the theory.
thanks
Gwyn
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G
Llanddona (Isle of Anglesey, Wales) Full Freeview transmitterWednesday 13 April 2011 5:38PM
Caernarfon
I'll give it a go this Friday & let you know the result.
thanks
Gwyn
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G
Llanddona (Isle of Anglesey, Wales) Full Freeview transmitterWednesday 20 April 2011 7:04AM
Caernarfon
The televes 45HD aerial does loop through without the 12v supply, tried this on a tempoary basis direct to one tv & the aerial pointing towards the transmitter through a velux window, seemed to be ok.
There's no switch on the distribution amplifier to cut off the supply, so back to the old drawing board. Since the master head amplifier is situated nest to the dipole a straight connection to the aerial is not an option.
Thanks
Gwyn
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Tuesday 12 April 2011 9:04PM
Caernarfon
OK, this is a strange one. Live near Bethel Caernarfon, receive freeview (HD/SD) from Llanddona. 2 Months ago had picture breakup (100% signal strenght but signal quality fluctuated badly between 20%-90%). Traced fault to bad connection on aerial (40 element Yagi type, with masterhead amplifier), made tempoary repairs and restored signal/quality back to 100%.
Decided to buy a new aerial and went for a Televes 45HD, suppose to be the best ones around. Tried the TV (Panasonic G20) and the signal quality dropped again and fluctuates between 30% - 100% ???? it also affects other tv's in the house, not just the Pani.
The Televes has a forward gain of around 16dB and a built in intellegent masterhead amplifier, just wondering of this type of aerial is picking up noise from other sources. Have fitted new amplifier/ new PF100 cable from aerial to amplifier.
Finally fitted back the old aerial and the signal/quality is back to 100%, all perfect.
Any ideas anyone.
thanks
G Jones