I know the answer might seem obvious (getting closer, checking connections, etc) but this has me stumped. I recently acquired an older170 Mhz based Radio Shack wireless mic and receiver for an upcoming event. I got it off of the bay and it was advertised as fully operational, but of course it wasn't. There was no audio upon receipt, and I had to change the mic wire from the electret clip on, to the transmitter. That got it going, but I notice that I have a lot of hiss in the receiver. I've tried moving closer, and I still have the hiss. If I turn off the mic (put on standby), I still have hiss, although a bit weaker as I was obviously getting some hiss from the mic which was expected. However, the hiss that remains stumps me and I shouldn't be getting it. Audio seems to be coming from the receiver fine, but with the amount of hiss, I don't think I'm going to be able to use this for the intended purpose.
I welcome any suggestions here to solve this.