[aprssig] Battery & Charger for APRS Station
kc5zrq at gmail.com
Mon Apr 21 02:07:44 CDT 2008
> One thing I'd be weary of is that you likely have no isolation of the
> charger from the TNC/transmitter. Be sure it's providing a clean DC
> Voltage and not introducing any unwanted things like hum into the TX
> Audio. It might be fine during receive but TX could get into the
> And give you problems. Look at signals on a scope to see any unwanted
> Or ripples.
I have never heard any transmit hums and I haven't heard any hums or
hash in either VHF or HF radios that I've attached to the battery with
the charger connected. This page
http://www.ctek.com/EN-US/Academy/Ripple.aspx has some interesting
graphs that might relate.
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