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LF: Re: Receiver

To: [email protected]
Subject: LF: Re: Receiver
From: "Alberto di Bene" <[email protected]>
Date: Fri, 31 Aug 2001 15:17:45 +0200
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Rik Strobbe wrote:

Hello Alberto and Alessandro,

The fact that a RX has a 'lazy' S-meter doesn't mean that it is a poor RX.
A correct S-meter is nice to give exact reports, but what really counts is
the sensitivity and good IM behaviour of a receiver.
Hi Rik,
  yes, of course, you are quite right. But lacking on my side a direct 
experience
of that rig, I used the available data to try to formulate a thumb-estimate.
Ideally, a good S-meter should occasionally flicker on the noise produced by a
50 ohm resistor at room temperature placed across the antenna input. The AGC
action should however enter into play only after a given threshold.
But this would be to ask too much to a receiver. After all, they aren't 
measurement
instrumentation... I think the only calibration the manufactures do is to set 
the
S-meter indication at S9 with 50 uV input at 14 MHz. Any other reading is
totally unreliable.

73  Alberto  I2PHD





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