On Nov 8, 9:56*pm, Bob wrote:
Hello,

Two questions, please:

a. *Is there some way to tell if a USB cable is USB 2, or if it is an
older version ? Some symbol on it, perhaps ? *What about for USB 3 *?

Is USB downward compatible for USB usages ?

b. *Any recommendations for an indoor antenna for HF (30 MHz) that
would be omni-directional, and really small in size ?

Would like to have something reasonably sensitive that might fit on a
desktop, or on top of the radio itself.

Would it have to be an active-antenna to meet this criterian ?

Thanks,
Bob

small hf receivers come with a simple extend able whip and an internal
ferrite stick for the real low bands... this is adequate if you are
just swling and stuff like that. a separate active antenna would give
you more flexibility in case the spot where the radio is has too much
noise from being near a computer or tv or something like that.
dropping a wire out a window or even running it around the frame of a
window is also a way to hide a bigger antenna. for the most part when
you are inside like that you are going to be more limited by local
noise than signal strength on just about any antenna.