Ultra high frequency UHF

Ultra-sound emissions typically occur when male rodents are exposed to female odours or altricial neonates to maternal sources (Whitney, 1974 Conely and Bell, 1978). Without the VNO, sexually inexperienced male mice do not utter emissions at ultra-high frequencies (UHF), whereas those with prior experience vocalise after VN-x, as discussed above (Chap. 5). Female mouse urine contains a unique UHF-eliciting component which is non-volatile but ephemeral (Sipos et al., 1995). The signal is degraded by oxidation and disappears within 15 to 18 hours of deposition. Direct contact with freshly voided urine must occur before males will vocalise (sexually experienced or inexperienced). At least one of the olfactory systems is needed for UHF to be elicited by fresh urine complete deafferentation abolishes the response (Sipos et al., 1993). Exposure to females permits UHF to be elicited by other than chemical cues (Labov and Wysocki, 1989). Nocturnal or cryptic species conceivably use ultrasound to advertise male presence whether this is to deter other males or assist with female location is unclear. 

The SDS system makes the fitting process more natural because it uses RFID technologies composed predominantly of ultra-high frequency (UHF) tags and... 

Simple radio telescopes can be built very inexpensively by amateurs using commercially available parts without modification. An old analogue television set and an ultra-high-frequency (UHF) antenna can be used to detect the Crab Nebula, and amateur radio equipment can be used to detectjupiter. 

Note that some reference articles consider the top edge of the millimeter region to stop at 100 GHz. The microwave spectrum usually includes the ultra high-frequency (UHF) band from 3 GHz down to 300 MHz... 

Ultra high-frequency (UHF) band Super high-frequency (SHF) band Extremely high-frequency (EHF) band ... 

GHz Ultra high frequency (UHF) UHF TV, radar, satellite communication Tropospheric waves, space waves... 

During the Second World War, since it was found that PE has very good low-loss properties for very high frequency radio waves, commercial distribution in Britain was suspended and secrecy imposed, and the new process was used to produce insulation for ultra high frequency (UHF) and super high frequency (SHF) coaxial cables of radar sets. 

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