Home › Forums › temp › Hum-free, Indoor LPAM transmission – even possible? › Re: Hum-free, Indoor LPAM transmission – even possible?
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[quote=polaris34]I am at the point where I just gave up trying to get the signal quiet. … The next step is to set up a proper tuned outdoor antenna but before I invest the time and money in this, I would like to know if anyone has an idea as to a way to set up an indoor AM station for personal use only (max 60 foot radius of transmission) that would be totally hum-free. If you have any suggestions I would be most appreciative.[/quote] Dave – You might try lashing together a battery pack with enough power capability to operate your tx with no connection whatsoever to anything else except its short, wire antenna and the tx ground terminal connected to your separate ground stake (not the “AC ground”). If with no audio input connected you can’t produce a hum-free carrier that way, then probably you never will get hum-free performance in any other configuration, including with an outdoor antenna. But then you can confine your troubleshooting to the tx to find the source of the hum.