Dudley,
Thank you for good tips. Actually the RFI is not my problem - not any more.
All my antennas are fed by coaxial cable with baluns and impedance matching
done at the antenna terminals high up and far away from the shack. The
cables are inside the metal tower and come to the house through an
underground pipe. This solution is the result of "learning by errors".
Most of the problems come from the leaking computers, but also those can be
solved. As an evidence, below are some noise level measurements (SigAvg) of
my SDR-1000 with antenna connector terminated to 50 ohm resistive "dummy
load". The measurements are made at "High" position of the preamp, 500 Hz
bandwidth and using the USB-to-PIO cable.
MHz dBm
1.86 -137.6
3.6 -142.9
5.4035 -138.1
7.1 -142.0
10.11 -142.7
14.1 -143.3
18.1 -142.7
21.1 -140.1
24.9 -142.1
28.2 -142.1
(The last decimal is not meaningful, but is given only as an indication of
the small differences between the different bands.)
The average noise floor of the spectrum display is about -160 dBm. I think,
these readings are typical to the accurately calibrated SDR-1000 (and I have
three of them). If somebody has considerably better readings, please tell
the trick, I want to try.
73,
Ahti OH2RZ
----- Original Message -----
From: "Dudley Hurry" <[EMAIL PROTECTED]>
To: "Ahti Aintila" <[EMAIL PROTECTED]>; <FlexRadio@flex-radio.biz>; "Wallace
Watson" <[EMAIL PROTECTED]>
Sent: Thursday, June 02, 2005 6:43 PM
Subject: Re: [Flexradio] RFI Issues
Ahti,
RFI issues can really drive one to drink...HI HI
One suggestion and one that I do here. Since you said that other rigs
have your RFI problem also, you might make sure that there is not a large
amount of RF in the shack.
