Add details about radios

docs/society/logistics/radios.md

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+# Radios
+
+At some events it is useful to issue handheld radios to event staff and volunteers.
+
+These are predominantly Motorola MOTOTRBO UHF radios (DP4801e, DP2400, DP1400, etc.) but (especially on analogue channels) other cheaper and more readily available radios can be used instead.
+
+SUSU has a supply of Motorola DP1400 radios which can be hired out on request but cannot be reprogrammed to use the SRO codeplug.
+
+## Licensing
+
+In the UK it is required that the operator of the radio system holds a license. The cheapest licenses come in the form of UK Business Light and UK Suppliers Light licenses which allow usage of some shared frequencies across the entire country.
+
+It should be ensured that a committee member holds the right license before radios on the below frequencies (apart from SUSU's) are used.
+
+## Codeplug
+
+There are several channels which are a mix of DMR encrypted and unencrypted channels and full analogue channels.
+
+| Channel | Type and Details | Encryption | Frequency | License |
+|-|-|-|-|-|
+| SRO 1 | DMR (CC7 TS1) | MOTOTRBO Enhanced Privacy | 456.3875 | UK Suppliers Light |
+| SRO 2 | DMR (CC9 TS2) | No | 456.9250 | UK Suppliers Light |
+| SRO 3 | Analogue | No | 461.8875 | UK Suppliers Light |
+| SRO 4 | Analogue | No | 458.8125 | UK Business Light |
+
+At some events, SUSU channels are also used, which are not published here for obvious reasons.
+
+### Encryption
+
+Encryption keys for the channels using MOTOTRBO privacy are available from the Technical Officer.