Hi Philip,
> Thanks for the info. Yes I tried out the new frequency posted this past friday,
> 15240KHz and am happy to report that I was able to receive it.
Good. Glad to hear it.
> I just got this shortwave radio not too
> long ago, it's a "Grundig YB300" and I have recently discovered that I
> basically can't get decent coverage around my house, the receiver is way too
> sensative, basically my own electrical wiring in my house introduces too much noise.
Shortwave receivers are much more sensitive than other radios... they have to be as the signals involved are weaker. But it isn't the radio at fault here. It's the ambient electrical noise as you correctly note.
> However, since it is a portable, I found that if I go into this big field across
> from my street and basically stand in the middle of it and erect the whip antenna, I
> receive absolutely SUPERB reception of all sorts of shortwave stations including
> Radio Australia. ...
> Unfortunatly, I find that an external wire antenna introduces too much noise (even
> when i use shielded cable to bring it into the house) into the signal when I bring
> it into the house.
What you need to do is to ground the radio. Usually there is a "ground" connection somewhere on the radio. That will reduce the noise floor with any antenna you use. Another consideration would be to take the radio around the house (on batteries!) and see if you can find the source(s) of the noise. Usually things like computers, refrigerators, touch lamps, variable light switches, etc. are the problem. Fix those and you might improve the situation greatly. Also, you might have a bad transformer outside the house on the electrical main which you might need to report to the electric company.
>If I use the included AC adapter with my shortwave radio, the
> adapter itself introduces tons of noise such that I honestly have to use batteries
> to eliminate the noise.
AC adapters can introduce noise if they are poorly built, have suffered damage, etc. Also, they increase the voltage to the radio, causing the amplifier section to work better. It amplifies everything including the noise floor. Try getting a different adapter from an electronics store. (Match the voltage, connnector, and politary). See if that makes a difference. Also, if you use batteries, try NiMH rechargables to keep the cost down.
Good luck.
Regards,
-Rob de Santos
AFANA Chairman
AFANA Blog