The setup I have is a Firestik Firefly 3 foot antenna on a firestik hood channel mount, with a Uniden PRO520XL. This is mounted in a 2000 Ford Focus Sedan.
Well on the way home (before I read all of the replys to my original post) I went to an open field at the local elementary school and tested my SWR on channels 1 and 40 in 4 different kinds of conditions: 1) all windows open, engine off 2) all windows shut, engine off 3) all windows open, engine on 4) all windows shut, engine on.
The readings in conditions 3 & 4 were 2.2-2.1 in channels 1 and 40. In conditions 1 & 2 the readings were slightly lower, but I will be using the radio in conditions 3 & 4 90% of the time.
I also measured the readings on channel 20 in all of the above conditions and they were around 1.1:1.
Obviously this was a ton of testing load on the SWR meter and the radio, as I didn't get out to adjust the antenna at all. I spent about 10 min straight testing the SWR in all of these conditions.
The back of the radio near the antenna connection seemed hot, as well as the section of patch cable attached to it. Is this normal and if not could it have been a result of this extensive testing? Can this cause damage to the radio? I already blew up a functioning 1983 Cobra 19, I don't feel like messing up another radio...
Thanks,
Mike