Internal mechanism is immaterial. Overall gain (whatever it may be) is constant for signals below the threshold, and decreases above it to prevent increase in audio volume. This is easily verified. B
Analog AGC (it should actually be AGR_eduction) has a fixed parameters and its main function is to prevent DSP A/D input overflow. As long as this is under control, digital AGC can do all the math w
I concur about AGC. It is supposed to be automatic and not manual. I use medium or slow AGC for CW and SSB reception. I ALWAYS run my agc threshold at 0.37 uv and RF gain full. I cannot find any exam
Well, yes, but I like to play with spectrum displays anyway :-) 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contest
Maybe you didn't increase the threshold sufficiently. Please note that AGC THRESHOLD values are in error by whole 21 dB with preamp on (9 dB with preamp off). So, you probably didn't get the threshol
I've tried this test many times. I do not hear the weak signal distortion with an AGC decay time of 20db/sec and a hang time of 0.35 and a threshold of 0.37 uv. These values work very well for me for
Than can work to some degree, you are using hang time to reduce the frequency of gain changes saving you from some of the distortion. Perhaps you have a much better behaved noise than I have :-) Thes
Hello, at least in some cases I can confirm Sinisa's observations. A sufficiently high AGC threshold (probably in combination with some hang time) improved readability at least on some signals, f.ex.
Maybe noise is the difference. I live out in the country and in very quiet radio location. 73, Carl Moreschi N4PY Franklinton, NC -- Original Message -- From: "Ulrich Hilsinger" <dh0ghu@dh0ghu.de> To
Same, but on sort of an isolated island, hi. Anyway, just now, mid-afternoon, my noise levels on the 20 meter band (using a little C3, 2 el. beam) and on the 40 meter band (using a tuner matched 132
Very likely, an apartment building surrounded by dozens of similar beasts is a much more hostile environment :-) 73, Sinisa YT1NT, VA3TTN _______________________________________________ TenTec mailin
Follow on note to the previous. Using the RX-340 which is callibrated down to about -140 dBm on the S meter, the noise DOES drop 10 or 11 dB when switching from a quiet frequency on the band to the B
Lucky one, you can use the full sensitivity there, and could even use more of it, it it was available. Which reminds me of Yuri's advice to preserve enough sensitivity for such locations. Well, given
Which translates to -184 dbW/Hz, a fascinating figure for 40 meters, good even for 10 meters. What time of (UTC) day? For a "remote" location in your area ICEPAC suggests from -171 to -155 dBW on 40
Sinisa responded: 0045 UTC, or 2:45 pm Hawaii Standard Time Well, I am about 2 miles inland from the South facing coast of Kauai, and at an altitude of some 500 feet ASL. Antennas have a clear view o
Oops, I believe I know where at least 3 dB of signal has gone! My antenna connection to the RX-340 on which I measure the reported noise signals comes from the input to the Orion Sub rcvr. So, there
ICEPAC thinks that's about time for the noise level to start rising. Compared to that, I have a clear view of, well, apartment building across the street :-) Got one on eBay, the best ham-related inv
The Orion S meter never goes below S1 period. The Orion firmware uses S1 as the base S meter value and will not let the S meter go below this. I find the RX340 S meter will show some signal strength
Ok, here we go with RX-340 S meter readings of the noise levels, well after sunset on this rather remote area of the Garden Island of Kauai. Why? To find out whether the Orion is sensitive enough! 1.
Ok, now several minutes later (0605UTC), and going back to the antenna sharing configuration with the Orion and RX-340, the noise on the 40 meter frequency has dropped the "expected" 3 dB to -115dBm,