Ken N9VV wrote: > On the front panel, select AGC CUSTOM and try again. The AGC system is > explained in the new 1.8.0 Users Manual on pages 95-96 > > "Slope (dB): Slope changes the rate at which gain increases with > decreased signal. If you have the Slope set to 10 dB and the signal > gets weaker by 1 dB, the gain will be increase by 10 dB. The increase > is still limited by max gain. This provides different decay action in > the AGC. > > Attack is unaffected. 0dB is default, 10 dB is maximum. > > Max/Neg Gain (dB): The maximum (or minimum) amount of gain the system > is allowed to apply. When receiving (AGC), this can be used to > minimize ambient noise that may cause listening fatigue. > > Attack (ms): This sets the time constant for the attack for the AGC. > Note that in order for this and > the two controls below it to be enabled, the AGC control on the front > panel must be set to Custom. > > Decay (ms): This sets the time constant for the decay for the AGC. > When a signal gets weaker, this determines how quickly the AGC will > respond to the need for increased gain." > > Hang (ms): To keep the AGC system from doing too much up/down, an > adjustable hang time is provided. After this time has expired, the > Decay will then determine how quickly the AGC gain recovers. > > Hang Threshold: The hang will NOT occur if the signal is weaker than > this threshold. > > Fixed Gain: When you choose Fixed AGC on the front panel, this number > is used to amplify the signal. > > > de ken n9vv > Ken, thank you for your prompt response. I already had reviewed the last manual, but I didn't understand this behavior. I don´t see any difference between the standard modes and custom, in fact the slope box is enabled on both. Maybe the explanation is that I reach the max level at -75 dBm and I did´n checked carefully between these level and the MDS, I´try tomorrow again.
Anyway, I can't understand if the signal output remains exactly constant between -15 dBm and -75 dBm, that is a 0 dB slope, so why this doesn't change when selecting other slope values?. Mark, I just received your response while writing this and this "noise expander" with no signal was exactly what I was trying to avoid and hence my measurements. Thank you all for the superb support from Flex and the users community. 73 de Ignacio, EB4APL -- 73 de Ignacio, EB4APL _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
