Stan, it sounds like you do not have the AF1 tuned to the same frequency as the K2 sidetone. It is simply a filter, so if it is set up for the same frequency as your sidetone, it will not affect the sidetone in any way. You will hear it normally during transmit.
That also might be the reason why it doesn't seem all that effective. You need to adjust the tuning to find the "peak" right on your sidetone frequency and leave it there unless you are listening to a signal slightly off of your frequency. Even then, it's best to use RIT (or SPLIT) to tune the rig to the proper frequency so the signal is correctly positioned in the I.F. passband. Once you have the AF1 tuned to the sidetone frequency (and a signal properly tuned in), you can increase the gain to "enhance" the signal or make it 'pop out' of the background just like APF on the K3. Suggest you use BP2 position on the bandpass switch for optimum effect. The Low Pass filter adjustment on the AF1 will normally be full clockwise (no high frequency cutoff). If you have some background hiss, you can try reducing the cutoff frequency (turn the control CCW) but be sure you don't move the cutoff frequency below your peak audio frequency set by the BP tuning or the LP filter will be "fighting" the bandpass filter :-) Ron AC7AC -----Original Message----- I just completed the AF1 kit and it appears to work properly. It doesn't seem like it does all that much more for my K2 on which I already have the KAF2 installed. But on my KX1 it definitely makes a difference. Here's the rub and I'm wondering how other users of the AF-1 handle it: Whether it's the K2 or the KX1 I'm using it on, when I go to transmit I lose the sidetone! I'm no technical genius but I've pretty much figured out that this is to be expected with the AF-1 being in the audio line out and not an integral part of the transceiver like the KAF2 with which there is no such problem. So I adjust the filter and bring out a weak signal nice a clear and just right, but when I want to transmit I have to turn the AF-1 OFF in order to hear my sidetone. Is this just the nature of the beast or did I miss something here? Thanks for any input, Stan Levandowski WB2LQF HF QRP CW -- Doing more with less for over 50 years! QCWA #35038 OOTC #4558 NAQCC #4740 SKCC #6488 FISTS #14992 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
