[OZAPRS] Distorted tones in central VK5 area

Wed Jul 11 23:54:58 AEST 2018

We fox hunt every Monday night here in Brisbane

Time to go for a drive hey

Andy VK4TEC

From: OZAPRS <ozaprs-bounces at aprs.net.au> On Behalf Of vk4tec at tech-software.net
Sent: Wednesday, 11 July 2018 11:35 PM
To: 'Australian APRS Users' <ozaprs at aprs.net.au>
Subject: Re: [OZAPRS] Distorted tones in central VK5 area

Sound 1200 baudish but rubbish

From: OZAPRS <ozaprs-bounces at aprs.net.au <mailto:ozaprs-bounces at aprs.net.au> > On Behalf Of Mark Jessop
Sent: Wednesday, 11 July 2018 11:04 PM
To: Australian APRS Users <ozaprs at aprs.net.au <mailto:ozaprs at aprs.net.au> >
Subject: Re: [OZAPRS] Distorted tones in central VK5 area

As a brief update to this, I did have a listen and heard this interesting sounding signal on 145.175MHz (please excuse the open mute):

https://www.dropbox.com/s/3qi4nicu5s1yogu/bad_aprs.wav?dl=0

Not sure if that's what you're hearing Terry, but it's quite strong here.

73

Mark VK5QI

On Wed, Jul 11, 2018 at 10:11 PM, Mark Jessop <lenniethelemming at gmail.com <mailto:lenniethelemming at gmail.com> > wrote:

Can you get a recording of the packets? I can run them through direwolf, which is fairly tolerant and may decode the packet successfuly.

73

Mark VK5QI

On Wed, Jul 11, 2018 at 10:09 PM, Terry, VK5ATN <vk5atn at internode.on.net <mailto:vk5atn at internode.on.net> > wrote:

This is primarily a question for APRS members in VK5.

For some time now I've been hearing some very distorted packets on 145.175.  They are very strong here in Balaklava, and they would appear to be coming from a station configured as a digipeater.

The packets do not decode on any of my receiving equipment.   Indeed the sound is very much the same as my own earlier packets from this QTH when using the computer connected to either of my TNCs - a strong 50 (or 100) Hz buzz superimposed on each transmitted packet.   Mine appears to be an earth loop issue which I've given up on. I now use a WX3in1 here as an Igate for my own experiments - and of course anyone else who is close enough to be heard..

I've a feeling that the station could be VK5RLH - I apologise if it's not, but whatever it is - it gets a lot of airtime - possibly to no useful purpose.    I'm completely out of any communication loop here at the SA level, so I wonder if anyone else has heard these packets, and/or  do they have information more substantial than my speculation about their source.   More importantly perhaps are any steps under way to rectify the problem.

73
Terry
VK5ATN

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