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Are you sure it isn’t an antenna problem as in most cases poor reception/transmission is down to the antenna and I have never had a case of poor reception on a 1299A that wasn’t the antenna. I would suggest trying a different antenna – if you have a friend with AIS – try your 1299 on his boat. If your 1299 is indeed low sensitivity then a new AIS module would be the answer but you say it is old and the AIS units are not cheap so you may be better to just treat yourself to a new 1299A. You don’t say how old your 1299 is but the version3 is much slicker than the Mk2 1299 and the Mk1 1299 is – well its very old!
If you are in the UK you can contact me for help.

UK Distributor
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We have HP-1228 plotter and recently  we buy an AIS HA-102 transponder/receiver. Finally we have all the connectors and plugs etc and we are in the process of connecting the AIS to the plotter, but we have come up with a problem. We need to connect 2 wires to the plotter and we can only identify one of them – the Orange AIS output. See attached image from your user manual below. What is the second color that we need? 

Hi Amikeren, sorry both of them are not Onwa brand, you should ask their technical support instead.

If any question about Onwa, is welcome to post here