Guy, Actually, the RF gain control does have an affect on the analog, as does the AGC. There are 2 types of AGC in the K3, the first is the more obvious that is controlled by the AGC Slow/Fast/Off and the second is a hardware AGC that protects the A/D converters. The "normal" AGC is summed with the hardware AGC to control the gain of the IF amplifier that immediately precedes the 2nd mixer stage. The "normal" AGC is also more than likely used in some of the DSP calculations but that is a little less obvious to the outside observer.
The Pre and Att controls, on the other hand, have real effects on the electronics. The Pre is used to switch the PIN diodes that control the signal path through our around the 11 dB RF Pre-amplifer stage. The Att switches relay K10 which physically switches in and out a 10 dB attenuator circuit. Granted, all these controls result from switch presses (the Att/Pre) or the A/D results of the RF gain pot that are decoded by the MCU and transmitted to the appropriate control circuits, but they do really have an affect on the radio's operation, not just in the software. However, you are right when you say this isn't a traditional analog radio, at least beyond the 2nd IF stage! 73, Chuck, AA3CS K3 #s 4072 & 4407 Guy, K2AV wrote: > > The thing to note here, this ain't your daddy's analog radio, the only > actual "stage gain" adjustments you have are ATT and PRE. The rest is > all in the numbers, as the front panel knobs are just numerical advice > to the firmware. They don't directly control anything. > > ... > ----- 73 - Chuck, AA3CS -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-AGC-dead-spot-tp5657353p5660211.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
