All posts by jb38
Below are all of jb38's postings, with the most recent are at the bottom of the page.
Tom : Although the ST5 area is approximately 33 miles away from Sutton Coldfield, however the first part of the code is not precise enough for reception assessment purposes, basically because the field strength of the signal in this area is predicted as only being around 36dB, too low for reliable reception.
A full post code or alternatively one from somewhere nearby, e.g: a shop incl post office.
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Norman: Your problem could be caused by two separate reasons.
(1) The fact of Sutton Coldfield having been listed on the engineering page since Monday 4th with the status of "possible weak signal".
(2) Problems related to a band of high atmospheric pressure which has been sweeping from West to East across Southern areas of the UK for the last day or so, this not really clearing away until around Monday lunchtime.
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Alan Goss: The model featured in your link is a much later version than the one I referred to, as witnessed by your model having protection against problems caused by 4G transmissions, this being a relatively recent event that didn't come into the equation until around three to four years ago.
However, apart from that. With regards to you having said that your aerial hasn't moved since it was installed, it most likely hasn't! but the angle the signal is received at most likely has, as in non line-of-sight reception of a nature such as yours, the angle the signal reaches your aerial can change slightly at certain times of the year due to weather etc causing changes in the reflective surface of the terrain, i.e: the summer / winter effect, atmospheric related reasons also playing a role, aerials in many instances having to be turned a few degrees to the left or right to peak the signal again, or in some cases physically moved to the left or right or even up / down.
This is something which has always applied in situations such as yours, but which was not really noticeable in the years analogue reception by this mode being far less critical as far as exact aerial alignment is concerned, the only thing that some viewers might have observed being the picture having developed a slight grainy effect at times.
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Alan Goss: The undermentioned is a link to the older version of your SLX6 distribution amplifier, each of the six outputs rated at 4dB less than the later model featured in your link.
http://www.labgear.co.uk/….pdf
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Richard Cooper : Well thanks Richard, but though not exactly "rotate", as that's inclined to suggest altering the polarity, which isn't involved, but to move the aerial a few degrees to the left or right from the angle of 190 degrees that the station is listed as being at from Alan's location.
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Andy: The vision mast head amp would be a continual overload on the SLX's output, which on this older model you are using likely result in failure of same, as nothing is mentioned on the spec sheet about it having overload protection.
My advice would be to purchase the Vision power supply as seen on the link, feeding its output into the SLX's UHF input socket.
Vision Masthead Power Supply (V23-2102G) > AerialSat.com
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Alan Goss: As you have now successfully achieved 100% quality @ 205 degrees, I would say that even although you might well be unable to turn the aerial any further because of the roof, your likely to find that you are only the proverbial stones throw away from the signal being peaked anyway, therefore I would be inclined to leave it at that for the time being.
That said, I feel that your reception would benefit (as far as reliability is concerned) by running at a slightly higher strength level (80%) with the aid of a low powered booster, the output of same fed into your distribution amplifier, but though it all depends on the maximum signal strength levels received from the other multiplexes with your aerial in its present position.
By the way, I wouldn't worry too much about the top bar of the reflector, as its most unlikely to have made any difference to the situation.
Another point I meant to include in my previous reply, is that in situations such as yours its quite common for multiplexes to be received at different levels even although they are all radiated at same power level, which in the case of Heathfield is 20Kw.
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B Cheeseman: Both programmes channels mentioned are transmitted on the COM4 multiplex, however as said multiplex is transmitted by numerous stations throughout the UK knowledge of your location is essential, as this will then enable a check to be made on the status of the transmitter involved.
Your location preferably supplied in the form of a post code or one from somewhere nearby, i.e: a shop incl post office.
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Martin Rosen: The post code for BT Colindale House is NW9 6LB, the aerials for the DAB transmitter referred to being mounted on the top of the block positioned nearer to the main road.
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Saturday 9 July 2016 8:02AM
Alan Goss: Digital UK's reception predictor indicates / suggests that reception of PSB3 / BBC HD is not possible from Dover, nor is ArqB / COM6, I only say suggests as reception predictors aren't exactly an exact science.
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