Hum on Farnborough LARS

[TCTC]

There seems to be a lot of hum on their transmissions on 125.25 MHz, hence voice-level is weak; does someone know who to alert?

(B.Sc. Communications Engineering)

[HEATHROW DIRECTOR]

Telephone Farnborough Airport and asked to be connected to Farnborough LARS.

[Packer27L]

http://www.ead.eurocontrol.int/eadbasic/pamslight-34662C008E8CF554B4DD66C01475B41E/7FE5QZZF3FXUS/EN/AIP/AD/EG_AD_2_EGLF_en_2018-04-26.pdf

ATC- Radar = 01252-526015

[chevvron]

http://www.ead.eurocontrol.int/eadbasic/pamslight-34662C008E8CF554B4DD66C01475B41E/7FE5QZZF3FXUS/EN/AIP/AD/EG_AD_2_EGLF_en_2018-04-26.pdf

ATC- Radar = 01252-526015


Go straight to the techies on 6013 rather than bother ATC.https://www.pprune.org/images/icons/46.gif They'll log it and pass it on to the techies anyway.
Sitting in the Ops room, I often detected a 'hum' when operating LARS West, but it was usually Steve (one of the techies) frying a burger in the room next door.

[Buster the Bear]

Maybe the TAG building (where air traffic lurks) is resonating with excitement at the impending ACP decision!

[chevvron]

There seems to be a lot of hum on their transmissions on 125.25 MHz, hence voice-level is weak; does someone know who to alert?

(B.Sc. Communications Engineering)
Talking seriously now, is it the type of hum you get from co-channel interference?
I ask because Farnborough has 2 transmitting stations on 125.250 on the airfield (plus another Tx/Rx at Southampton) which are only about 200 yds apart (dual Tx/Rx are a legal requirement for a licensed airfield, the Southampton one is for better low coverage for LARS West) but only one should be operating at a time; the software controlling them decides which is the better one to use although ATC can and do change over manually, but if one is 'stuck' on transmit on some way, it could just could explain the hum.

[TCTC]

Thanks Chevron, that's interesting but I don't think it is CCI/beating between the transmitters; sounds much like a lot of mains-hum!