[aprssig] Trouble with Calculator Serial Cable

[Dave Baxter]

Or even better, opto isolate it.  Sounds like you have a conducted RFI problem.  Use a decent external antenna connected to the D7, but with a seperate ground plane, even a 1/4 wave "mag-mount" will drasticaly reduce the ammount of RF on the serial cable, and also improve the RX performance too..
 
73..
 
Dave G0WBX.
 

________________________________

From: John Habbinga [mailto:kc5zrq at gmail.com]
Sent: Fri 25/05/2007 15:38
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Trouble with Calculator Serial Cable



Install a ferrite filter on the cable.

Example:
https://www.argentdata.com/catalog/product_info.php?cPath=21&products_id=44




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