RadioBanter - View Single Post - Loop Antennas / minijack works-clips don't / impedence??

Charly · August 10th 06, 11:00 PM posted to rec.radio.shortwave

a écrit :
The question is, what can I use as a ground point? The seller said the
negative battery terminal... Besides being "sloppy" (maybe put a wire
around the battery door), will that do damage? Any other locations to
ground it, for a portable which doesn't have a ground (or antenna)
terminal?

If I don't use headphones, someone mentioned the headphone jack... Is
that ok? I guess I'd have to buy a minijack... which terminal would be
ground? Do I then not connect anything to the other terminal of the
jack?

Yes it can be ok. I did it. If your radio has a line-out jack, then you can use
it. You can also use the negative connection of the power jack if your radio got
one.

Interestingly, at around 15 mHz, using the antenna via the clips, does
seem to work (I can tune the antenna and get sensitivity increase - I
don't know if it 100% matches the jack or not - but it's pretty good).

At around 9 mHz, using the antenna via the clips only seems to see the
wire and not the antenna at the end (tuning does nothing).

You must tune the antenna VERY SLOWLY ! The KA31 is very difficult to tune
sometime, and you can only see the difference on the S-meter sometime...
Using this antenna without an S-meter is quite difficult, I don't do it.

Does that show an impedence matching issue?

Dunnow... What is your radio ? I did use it with a Sony SW100 and a Sangean ATS909.

Thanks

You're most welcome...

Charly