I recently acquired a used IC 718 and it has loud "birdies" on all the ham bands. They occur every 40khz, approximately. They also slowly drift in frequency. They are kind of harsh sounding. I'm just using an indoor wire for an antenna. When I disconnect the antenna I don't hear them. I unplugged my computer and modem but no change. On some bands they are as strong as S8. Otherwise the receiver seems to be working. I'm wondering if this is something generated inside the transceiver. I'm trying to get back on the after 35 years. Any help is greatly appreciated.
Leonard, KD5UC