Merle:
That's far more accurate that the Orion II S-meters The difference may be
caused by a different type of AGC implementation in the version 2 firmware.
It would be interesting to get numbers from Orion I owners using v. 2
firmware. You're right about needing an accurate meter when judging antenna
performance. A good S-meter is a valuable tool!
Ron N6IE
www.N6IE.com
----- Original Message -----
From: "Merle Bone" <merlebone@charter.net>
To: <tentec@contesting.com>
Sent: Thursday, January 10, 2008 11:38 AM
Subject: Re: [TenTec] STANDARDISATION OF S-METER READINGS
The Orion's S-meter calibration certainly isn't anything to "write home
about," but it is "representative" of the distant stations signal
strength.
Running V1.373b5 I get the following readings using calibrated signal
generator and attenuator on 14.058 MHz:
Sig Level Preamp On Preamp Off "Standard
Reading"
50 microvolts S9+11 S8.1
S9
-6dB S9 S7
S8
-12dB S8.1 S5.5
S7
-18dB S7 S4.5
S6
-24dB S5.8 S3
S5
-30dB S4.5 S2
S4
-36dB S3.1 S2
S3
-42dB S2.1 S1.8
S2
-48dB S1.8 S1.8
S1
S1.8 is about as low as the S-meter goes on this release of the firmware
with the RF gain at 100 and the AGC threshold set for .36 microvolts and
the decay set for 200dB/s. I use the "calibrated measurements" when I am
trying to understand antenna performance - particularly "front to
back/side" measurements.
73, Merle - W0EWM
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