Shared

11 May 2015

UK Wireless Microphone Licence:

UHF - (1 year or 2 year Licence)

Channel 38 is available on shared non protected basis from�606.500 - 613.500 MHz. Licensees may use any frequencies within this range.

 shared1

Guard bands have been included at each end of channel 38 to avoid interference with future services in channel 37 and channel 39 and facilitate free-roaming use throughout the UK.

shared2

10 Channel plan:

The UK Wireless Microphone Licence does not specify spot frequencies in channel 38 but the 10 channel plan below will ensure that all frequencies can operate in the same location without harmful interaction. This plan is a suggestion only. Users and manufacturers can devise their own plans that could involve any number of frequencies within the range.

Channel 38 - 10 channel set ratings

2Tx IM(3) and 3Tx IM(3)

 
 

25k0

50k0

100k0

Risk Index

606.600

0

2

2

✔ 1.50

607.500

0

3

5

✔ 2.75

608.150

0

4

2

✔ 2.50

609.150

0

3

4

✔ 2.50

609.950

0

3

6

✔ 3.00

610.550

0

4

4

✔ 3.00

611.250

0

2

4

✔ 2.00

612.300

0

4

3

✔ 2.75

613.150

0

3

1

✔ 1.75

613.500

0

0

2

✔ 0.50

Score total

22.25

 

Average

✔ 2.225

In developing the plan we ensured that each frequency is safely spaced apart. However interaction can sometimes occur between frequencies even when appropriate spacing is applied. This unwanted interference can occur when equipment is operated close together in the same vicinity. It is known as intermodulation or “mixing”.

In the real world these unwanted signals appear on or close to the frequencies being used. To help make sense of this we have devised a figure of merit that we have called the “Risk Index”. This is calculated according to the quantity of unwanted signals and their spacing from the frequencies we are trying to use. Closer spacings have a higher risk of causing interference so are given a higher weighting in the sum.

823-832 MHz and 1785-1805 MHz

Added to the UHF Shared Licence in March 2015, these ranges are available for low power PMSE equipment as outlined here.

  • 1785 - 1805 MHz: Not available in Northern Ireland
  • 1800 - 1805 MHz: Not available within 10 km of Oakhanger,(SU776357), Colerne (ST808717) and Menwith Hill (SE210560).

VHF:
(1 year Licence)

175.250* 175.525* 176.600* 191.900 192.800
193.000 199.700 200.300 200.600 208.300
208.600 209.000 209.200 209.600 209.800

* Not available in Northern Ireland

Specifications:
RF bandwidth is limited to 200 kHz. Transmitter power is limited to 10mW if handheld, 50mW if body-worn.