Question about the PR6-10. With no signal, and the preamp off, I get a gentle 'whoooooooosh' on 6, 10, & 12M, 1 bar on the S meter. Turning on the PR, on 6M I get a slight increase in the 'whoooosh'. On 10M & 12M the S meter goes to S7 or so and the noise level goes WAY up, sounds like 160M in a summer thunderstorm. Is this the expected operation? 73, Mike NF4L