All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
Dawn McAdam: For a start off you will need to run another cable from the dish to the upstairs room.
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Gordon Elliott: No problem.
Here is another explanation to summarise what you're trying to do:
If you combine the two aerials (using a splitter in reverse) you will get the sum of the two signals. That is, when you are receiving from Belmont on C30, the KL aerial will also be picking up that channel. You will get the sum do your aerial lead.
Therefore the objective is to prevent (by filtering out) the channels of one transmitter being picked up by the other's aerial. So you are trying to stop the KL aerial picking up 30, 53 and 60; and you wish to stop the Belmont aerial picking up 43, 46 and 49 (to change to 40). If you can achieve this using filters, then you can combine the result.
The "future-proof" thing means that Belmont "might" be broadcasting on 33 and 35. There was talk of using 36 at one time, but that doesn't appear on the cards of these proposed HD muxes.
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Dawn McAdam: It is a satellite receiver and must therefore be connected to a satellite dish so as to receive the signal.
It is possible to DIY an additional feed, although this may void any warranty you have with the company that installed the new dish.
The LNB is the bit on the arm that the cables connected to. If it is a dual LNB (two cable connections) and both are used then you will need to replace the LNB with a quad to give you two more connections. LNBs are available online from sources such as eBay for around £10.
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Dawn McAdam: As you may have gathered, the aerial link between your downstairs Sky box (which is connected to the dish) and the upstairs one does not provide any connection to the dish. It is purely so that you can view the output of the downstairs box using an analogue signal which was the type used for TV before the switchover.
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Michael: I'd be more concerned that if I ordered haddock I got haddock and if I ordered cod I got cod.
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David: See:
Mendip Transmitter
If this is a second TV can you run it off the roof-top aerial as well?
According to the Megalithia terrain plotter, you would appear to have line-of-sight to the top of the Mendip mast which is 36 miles away.
There is always the possiblity that channels from Mendip might change in future (due to the 4G clearance) and the ned HD services that are likely to use channels 31 to 37. As such, I suggest that you look at a Group E or wideband aerial.
How effective it will be in the loft obviously depends on how much or how little the roof blocks the signal.
Having an aerial that is sensitive across more of the band (e.g. wideband) doesn't have any effect on what you're receiving. Your receiver is tuned to one particular channel at any one time so other signals don't affect it.
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Sally Ahmed: When using the automatic tuning you should be able to avoid other transmitters, such as Edmonton's ITV/C4 etc which is on C57, by having the aerial lead unplugged after the first 30% of the scan.
C28 is correct for Crystal Palace. Judging by the prediction from Digital UK, you could perhaps potentially be getting a signal going into your tuner which is on the high or perhaps excessive side.
See:
Freeview signals: too much of a good thing is bad for you | Digital switchover | ukfree.tv - 10 years of independent, free digital TV advice
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mike giggs: Knowledge of your location, preferably in the form of a postcode or nearby postcode such as a shop, would allow some prediction as to the chances of success to be made.
Judging by the map above, generally speaking, Dartford is shaded from Bluebell Hill. This doesn't mean that it won't be able to be receiver but does generally suggest that it is not the easiest place to receive and whether it can or can't be picked up might vary over the area, perhaps over short distances.
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Gordon Elliott: You are a wee bairn!
Perhaps, if needed, you may be able to build a custom filter or filters on Veroboard. As I say, I'm not an aerial professional so don't know how likely tou might be to succeed although it will help you to keep your hand active with a soldering iron. Much of my knowledge of RF has been gathered as an anorak on this site having read comments from the pros.
I should imagine that it will be a good idea to put the filter(s) for each aerial in a screened enclosure. Obviously you should ensure that the filter for the KL aerial is screened from the Waltham one.
I wonder how effective a band-pass filter might be over the six or 10 channels of KL. The same goes for a band-stop filter fitted to the Waltham aerial for the same frequency range. Or maybe you would have to filter each individual channel.
Just bear in mind that the channels 31 to 37 are likely to come into service in the next few years from Waltham, so don't filter them out if you can avoid it.
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Monday 21 January 2013 10:37AM
Gordon Elliott: Or, of course, you could have two aerials, keep the feeds separate and feed them each into a different receiver.
For example, feed the full complement of channels from Waltham or Belmont into your PVR and TV. Have a set-top box receiver for KL which you use when regional programming is being broadcast which these days is the local news and one or two regional programmes.