Re: [HCDX] HF Preamps~ Do I Need One?

[Dan Henderson <dandan2@xxxxxxxx>]

I agree with Mauno.  The antenna must be functional.  If you have an older 
receiver with a high noise figure(a measure of the quality of the input RF 
amplifier in the receiver), a very low noise RF preamp can do wonders.  I 
also agree with Mauno re the preamp on the AOR 7030.  It is excellent, and 
really adds to the "hearability" of noise-level broadcast signals.  There 
are many on the market--the one from Kiwi works very nicely, and can be 
matched to most HF antennas.

Dan Henderson

At 02:43 PM 7/29/00 +0300, you wrote:
> At 16:53 28.7.2000 -0400, Bill Smith wrote:
> > A preamp used thus will increase the signal amplitude -- and the background
> > noise -- by the same amplitude, but it WILL NOT improve the signal
> > readability over noise.
>
> Sorry Bill, but I have to believe my ears. When there is a very weak 
> signal at dawn or dusk hours (which I find to be the most interesting 
> times) on medium wave, using a good preamp helps in many cases. My 
> receiver is not broken or of a bad quality (AOR AR7030+). The signal maybe 
> unreadable no matter how much volume is turned on, but when a good preamp 
> is switched on it may become readable. This happens both with K9AY and 
> long-wires of 400 metres. If it wouldn't happen, I wouldn't use a preamp. 
> I don't care about the theory, I just listen.
> But I agree that the first thing is the antenna. It the antenna doesn't 
> work well, a preamp doesn't help, either.
>
> 73, Mauno
>
> _______________________________________________
> Hard-Core-DX mailing list
> Hard-Core-DX@xxxxxxxxxxxxxxxx
> http://www2.hard-core-dx.com/mailman/listinfo/hard-core-dx
> http://www.hard-core-dx.com/

_______________________________________________
Hard-Core-DX mailing list
Hard-Core-DX@xxxxxxxxxxxxxxxx
http://www2.hard-core-dx.com/mailman/listinfo/hard-core-dx
http://www.hard-core-dx.com/