Bob,
Continuing, I just looked at the AGC discussion on p. 109 of the F5K
manual. The bullet describing the "Slope (dB)" parameter clearly
states that there is an AGC threshold. Does the operating control
panel "AGC-T" control actually adjust the threshold? Or, is the
threshold hard coded? I do not really care about twiddling the
threshold, I would like to understand just what the AGC-T is
adjusting. Thanks.
Bob
On Jun 29, 2009, at 1:11 AM, Bob McGwier wrote:
This one does conform and should function like legacy, out of
touch, radios. Since this radio is calibrated to a 50 Ohm load
with the internal generator producing a known voltage, AGC-T is
calculated to dBm or as close to it as we could get.
Bob
N4HY
Tim Ellison wrote:
Read this article. It should clear up a few misconceptions
regarding AGC-T. Remember this is a software defined radio and not
everything works like it did on a traditional analog/dsp radio.
http://kc.flex-radio.com/KnowledgebaseArticle50153.aspx
-Tim
-----Original Message-----
From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz
] On Behalf Of Robert Jefferis
Sent: Sunday, June 28, 2009 8:57 PM
To: flexradio@flex-radio.biz reflector
Subject: [Flexradio] Automatic Gain Control Threshold "AGC-T"
versus reality
Greetings all,
I am wondering if anyone in "FLEX LAND" can tell me whether or not
there is a known functional relationship between the "AGC-T"
setting and receiver input signal to noise ratio (SNR). I have
read several postings related to adjustment of AGT-T for good, or
desirable performance. My experience with traditional receivers
tells me that this parameter should, in principle, be a "set and
forget" parameter. Pick the number of choice, typically between
0.5 and 2 micro Volts into 50 Ohms. Not that it matters, but I am
using an F5K.
Bob, KF6BC
--
(Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio Member: ARRL, AMSAT,
AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"You don't need to see the whole staircase, just
take the first step.", MLK.
Twitter:rwmcgwier
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