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Technical FAQs

How do I convert UHF channel numbers to frequency (MHz)?

First enter your postcode in the widget to reveal the related UHF channel numbers for your likely serving transmitter.

Then use the table below to locate the relevant (centre) frequency for each of the UHF channel numbers you have found. For example:  UHF channel 21 equates to 474000 Mhz.

HF
channel
Negative
offset
(MHz)
Centre
frequency
(MHz)
Positive
offset
(MHz)
UHF
channel
Negative
offset
(MHz)
Centre
frequency
(MHz)
Positive
offset
(MHz)
21 473.833 474.000 474.167 45 665.833 666.000 666.167
22 481.833 482.000 482.167 46 673.833 674.000 674.167
23 489.833 490.000 490.167 47 681.833 682.000 682.167
24 497.833 498.000 498.167 48 689.833 690.000 690.167
25 505.833 506.000 506.167 49 697.833 698.000 698.167
26 513.833 514.000 514.167 50 705.833 706.000 706.167
27 521.833 522.000 522.167 51 713.833 714.000 714.167
28 529.833 530.000 530.167 52 721.833 722.000 722.167
29 537.833 538.000 538.167 53 729.833 730.000 730.167
30 545.833 546.000 546.167 54 737.833 738.000 738.167
31 553.833 554.000 554.167 55 745.833 746.000 746.167
32 561.833 562.000 562.167 56 753.833 754.000 754.167
33 569.833 570.000 570.167 57 761.833 762.000 762.167
34 577.833 578.000 578.167 58 769.833 770.000 770.167
35 585.833 586.000 586.167 59 777.833 778.000 778.167
36 593.833 594.000 594.167 60 785.833 786.000 786.167
37 601.833 602.000 602.167 61 793.833 794.000 794.167
38 609.833 610.000 610.167 62 801.833 802.000 802.167
39 617.833 618.000 618.167 63 809.833 810.000 810.167
40 625.833 626.000 626.167 64 817.833 818.000 818.167
41 633.833 634.000 634.167 65 825.833 826.000 826.167
42 641.833 642.000 642.167 66 833.833 834.000 834.167
43 649.833 650.000 650.167 67 841.833 842.000 842.167
44 657.833 658.000 658.167 68 849.833 850.000 850.167
Introduction to Freeview transmitters

To get Freeview you need an aerial in good condition and pointing in the right direction towards a transmitter that sends out the TV signals in your area.   Across the UK is a network of transmitters, usually place strategically on hills to send out TV broadcasts across a wide area.    Transmitters provide the signals picked up by your aerial that your Freeview TV or recorder decodes so you can watch the TV channels.

Areas with large populations (major cities and towns) are served by large transmitters that cover most of the population – 90% of the UK population is covered by main transmitters.  Smaller relay transmitters fill in the gaps caused by local geography – hills, valleys or remote locations – but only provide the most popular channels.

In nearly all cases, when you tune your TV or recorder your aerial will pick up signals from only one transmitter with the correct channels and appropriate regional variations. However, it is possible for an aerial to pick up signals from more than one transmitter when it’s positioned in an area where the coverage of two or more transmitters overlaps.

In this case, you may be receiving the wrong regional channels. The correct ones may appear lower down the TV guide, often in the channel number 800 onward.  The problem can sometimes be rectified by a manual retune.

If channels are missing, (and you have already retuned, or you’ve never had them) it may be due to them not being available on the transmitter your aerial is receiving signal from.  In this instance, you may wish to try and manually retune to select an alternative transmitter (if available).

When it comes to replacing or adjusting the aerial itself, we recommend you always use a qualified aerial installer who will have experience working at heights and information on transmitters in your area.

In general the closer you are to the transmitter, the stronger your signal. If you live very close to the transmitter but find you are getting a blocky/broken picture, it may be that you are getting too much signal, which can cause equipment to become overloaded. This may be because you have a signal booster fitted to your aerial, and we recommend you get a professional installer to deactivate this for you.

Why am I receiving the wrong BBC or ITV regional programmes?

If you are receiving the wrong BBC or ITV regional programmes, it may be because you are getting TV signals from two or more regional transmitters at your address.

In this situation, it’s possible that your preferred services are appearing lower down the list of channels than you expect – in the 800s. If your box or TV has a ‘favourites’ function, you can save these channels in this so that you can find them easily.

Alternatively you can manually retune your box or TV to select your preferred regional service. If this does not help, contact the manufacturer of your equipment for support.

How do I manually retune my Digital TV equipment?

If you are comfortable with technical information and your basic retune hasn’t worked, you can use this manual retune guide to address the following problems:

  • If your Freeview TV or box picks up a different regional (BBC or ITV) services to the the ones you would expect to receive. (e.g. BBC England instead of BBC Scotland or BBC East Midlands instead of BBC Anglia).
  • If you are missing some channels.
  • Or if your equipment has stopped working.

As a first step, check to see if your desired channels are appearing further down the list in the TV Guide (the 800s), If they are, make them easier to find by saving them to your ‘favourites’ list.

Digital UK currently offers a comprehensive guide to manually retuning your Freeview equipment:

Digital UK guide to manual retuning.

If you find the manual re-tune is too difficult, get in touch with either the Confederation of Aerial Industries (CAI) or Get Me Digital who can give you details of one or more members who operate in your area and guarantee their work:

Find an approved CAI installer at Get Me Viewing

Find a digital professional at getmedigital.com 

A local installer will understand the circumstances and local geography in your area and suggest the best option for you.

Note: some early products do not offer a manual retune (or manual search) facility – please check your instruction book for more detailed information.

Do I need to change transmitter?

In some areas it may be possible to receive a TV signal from more than one transmitter. Usually, you won’t need to change transmitter as your TV will tune to the one with the strongest signal.

If you have lost your regular channels or are not getting the regional TV service you expected, firstly, we recommend you retune your box.   Channels on Freeview can change from time to time – new channels are frequently added, a few removed and channel numbers can change.  This may restore the line-up you expect.

However, sometimes, if you are having problems with incorrect regional services or missing channels, you may want to try changing transmitter. You can check which transmitters serve your area, predicted signal strength, and the channels available on them by using the detailed view on the  Digital UK coverage checker.

The next step is to try a manual retune to input directly the information from the transmitter you prefer to use. If this doesn’t work, your aerial may need to be realigned, or possibly replaced.

Get in touch with either the Confederation of Aerial Industries (CAI) or Get Me Digital who can give you details of one or more members who operate in your area and guarantee their work:

Find an approved CAI installer at Get Me Viewing

Find a digital professional at getmedigital.com 

A local installer will understand the circumstances and local geography in your area and suggest the best option for you.

For a manual retune: how do I convert UHF channel numbers to frequency (MHz)?

When products are manually retuned, most require a UHF channel number [link] to be entered [(eg: 21-68)], but some may require the frequency in MHz – similar to the frequency required for a radio station.

Steps:

1) Enter your postcode into the widget on the right hand side of this page to find out which UHF channel numbers you will need (based on your most likely transmitter.

Digital UK guide to manual retuning

2) Use the converter table  on this page to convert your UHF numbers to MHz.

Convert channel number to frequency

Will 4G phone signals interfere with my TV signal?

Mobile phone operators continue to expand fourth-generation (4G) coverage to provide customers with high speed wireless broadband. Where these services are broadcast on certain airwaves (the 800MHz band), they may interfere with Freeview reception*. A new company, at800, has been set up by the mobile operators to provide filters and other assistance to households where TV reception may be affected.

*Existing 4G services from EE do not affect Freeview services as these operate in a different band.