Related by context. Frequent words. (Click for all words.) 55 AMSAT 55 ARRL 54 RTTY 53 ITU 53 QSO 53 Amateur Radio 51 EBU 49 VHF UHF 48 ETSI 47 callsign 47 IOTA 47 IKF 46 QRV 46 ARISS 45 Union ITU 45 QRP 45 SCSA 45 ASPRS 45 UEMOA 44 UPU 44 IrDA 44 SDR Forum 44 AIAA 44 ham radio 44 ICOM 44 USTTA 43 Sailing Federation 43 IACS 43 GVF 43 EUMETSAT 43 HF bands 43 Institute ETSI 42 IMTC 42 ITTF 42 IFAC 42 WMO 42 EU Troika 42 GMES 41 EUROCONTROL 41 HAM radio 41 IMAPS 41 CIP4 41 Federations 41 ISOC 41 EESC 41 COSAFA 41 COMPTEL 41 Electrical Engineers 41 OIE 41 EC 40 IEEE 40 Macra 40 Telecommunication Union 40 #.# MHz [001] 40 GNSS 40 FASANOC 40 IRB 40 USEA 40 OSCE MG 40 SLRFU 40 IEEE Standards 40 ISO IEC 40 CEPT 39 GCF 39 CESR 39 IEEE #.# [001] 39 Civil Aviation Organisation ICAO 39 BUSA 39 BWA 39 Femto Forum 39 ISESCO 39 ATIS 39 VHF 39 Confederations 39 MHz frequency 39 LVA 39 NENA 39 CAT iq 39 Fiba 39 ECSC 39 BICSI 39 AUCC 39 BAS 39 CAF 39 TOPEX 39 DAMA 38 EGEE 38 WBF 38 CARICOM Secretariat 38 WACS 38 W CDMA 38 QST 38 ICTA 38 RTNDA 38 SAR 38 korfball 38 NSS 38 ICAO 38 3GPP 38 ESA 38 USRA