Unusual clicking sound

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interference
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Joined: Thu Feb 14, 2013 10:29 am

Unusual clicking sound

Post by interference »

Hi all,
Can anyone recognise this clicking sound coming through on VHF Hi Band? It comes through as 5 groups of 4 clicks followed by 1 click by itself, then repeats again. Ignore the line hum in the background. This doesn't come through the receiver, it was part of the final recording.
http://chirb.it/fPmNhK

Any suggestions if it is Amateur, telementry, switching, relay, gps, marine related, data etc?

Thanks
robbage
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Re: Unusual clicking sound

Post by robbage »

My first thought is a spark gap noise such as a relay contact switching. Unusual pattern though. Have you tried a different location (eg walk to the other end of your street)? Never heard that one with amateur, gps, aeronautical or marine.
Rob
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interference
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Re: Unusual clicking sound

Post by interference »

G'day, it can be heard for about a 8 square km area.
Blinky
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Re: Unusual clicking sound

Post by Blinky »

Is it on all frequencies in VHF Hi band or spot frequency and can you say which suburb, then if someone is driving by they can have a listen and see if they hear it and perhaps if have a sig strength meter can see where it is strongest. Good foxhunt practice considering it could be restarting sometime although clicks could make it difficult.

:wink:
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robbage
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Posts: 2993
Joined: Sat Feb 09, 2008 10:06 am
Amateur callsign: VK6UFO_VK6RN
Scanners and Receivers:  
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Diamond Welz WS1000 wideband handheld
Radioshack Pro 28 handheld
Uniden UBC72XLT handheld
Uniden UBC73XLT handheld
Uniden UBC330CRS desktop

Two-way
Yaesu VX-3R 2m/70cm Ham TRX and wideband RX handheld
Yaesu FT-1802M 2m Ham TRX mobile x 2
Yaesu FT-7800R 2m/70cm Ham TRX and wide band RX mobile
Icom IC-208H 2m/70cm Ham TRX and wide band RX mobile
Icom IC-706MKIIG all-band all-mode Ham TRX mobile
Icom IC-V85 2m VHF Ham TRX handheld
Wouxun KG-UVD1P VHF/UHF wideband Ham TRX handheld
Wouxun KG-679P VHF wideband Ham TRX handheld
Wouxun KG-713 UHF wideband Ham TRX handheld
Location: Just on the border of your waking mind

Re: Unusual clicking sound

Post by robbage »

interference wrote:G'day, it can be heard for about a 8 square km area.
Unlikely to be a relay at that range.
Rob
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Re: Unusual clicking sound

Post by interference »

Hi all,
The interference has been limited over winter but Summer has started it up heavier than usual. It occurs mainly at night so I think it is VHF ducting bringing it from a distance, maybe North of Ocean Reef. It is blocking 156.675 MHz regularly so if anyone is cruising along the coast North of Perth between Ocean Reef and Jurien Bay please feel free to scan around the 156 MHz area and see if you can "Fox Hunt" the location of the transmission if possible. Any help would be appreciated.
Here is a clearer piece of audio of the interference.

http://chirb.it/vqrEw6

Thanks
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