So I got a new radio (new to me) and hooked it up to my antenna and now I’m get a constant up and down pulse in all the HF bands. The radio is an IC-7300 and the antennas are a 33ft and fed and an MFJ-2389. My IC-705 didn’t have the noise so I’m hoping it’s not this used radio. ANY help is appreciated! Thanks all!
Edit
The antennas are in the attic and I’m moving them outside today.
73
Sly
Hi Tony
Noises can be caused by LED bulbs, Solar panels, etc. But the strange thing is that it only does it on the 7300. Try disconnecting the antenna from the radio and see if the noise goes away.
Alfredo WP3C
Good call, yeah that was what tripped me out too. I’ll check and see
No QRM with the antenna off
Update to this, the 7300 is the only radio to have this issue. I have connected a 705 and Anan G2 with no noise. Guessing something is up with my eBay radio.
Have we tried a dirty ballon “coiled coax”
Make sure station is grounded and no new issues with coax?