Allocated but unused airfield VHF frequencies ?
Do we still have any of these in the UK ? I don't know but I would be surprised if we did, given the pressure on the VHF airband. I remember East Midlands once had GMC as 121.9 but it wasn't in use in the early 1990s. More recently, Bristol had a GMC frequency but it was seldom used. Leeds Bradford has a Delivery frequency which is manned most of the time (Tower assistant job) but that doesn't stop KLM crews frequently trying to get their clearance from Tower and being patiently redirected.
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I'd be very surprised if any assignments exist that are never (from when?) used.
If an audit of frequency use was done I imagine most airports would claim that rarely used frequencies are needed for busy periods, backup and in case of other frequencies being blocked.....and are probably used in these circumstances. |
LHR has a ‘spare’ VHF for use if one of the others gets jammed/too much interference etc.
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Just curious, Gonzo, but how much is it used? And does Ofcom or the CAA (or whoever looks after such things in the UK these days) ever audit spectrum use/availability that you are aware of?
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Originally Posted by Gonzo
(Post 11214928)
LHR has a ‘spare’ VHF for use if one of the others gets jammed/too much interference etc.
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Is there now any pressure on the UK AMS band now that it is allocated on 8.33 KHZ spaced channels?
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Leeds Bradford also has a seldom used secondary Radar frequency in the 125 mhz range. It's needed as a just-in-case back up and was once designated as 'Leeds Director' a few years ago. Very grand! I expect the Delivery frequency would be reallocated to GMC if such a position were ever to open there.
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In addition to frequencies used for ATC/AFIS/AGCS don't forget many others in the VHF airband were allocated for company frequencies plus some were allocaed for MOD trials (I know of 2 allocated to Farnborough which ATC weren't allowed to use) and these latter were ones which were seldom used.
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You require a licence from OFCOM to use a frequency which last 12 months. I assume if you do not renew, the frequency would be re-allocated after a set period of time.
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