Evert, There's a small LPF board in betatest phase which cuts off anything above K3's passband. May be you can ask Elecraft to test a sample. Especially people with good hearing (congrats, you are an exeption nowadays :-) can benefit form this board. It's a 24db/oct chebychev with low noise opamp that doesnt have any coloration in-passband.
As a quick solution you could also try 2 elco's over the HP outputs, I tried 4,7 or 10uF. This will give a 6db/oct roll off. I've read the LPF filterboard might become generally available someday for people wishing to clear the above-passband products. 73' Paul PD0PSB Evert Bakker (PA2KW) wrote: > > Hi Tom, > > --- Good headphones designed for communications shouldn't even go that > high. --- > > May be you are (should be) correct. But my Heil Pro does as I do hear > these > high tones coming through. > > Just an example; when using SSB (MON =2) 30% of the time I clearly hear a > "tune" of high frequency (must be somewhere around 16 Kc if I compare it > with the line transformers in old TV sets) when in TX mode. It looks like > a > lottery when pushing the PTT, it's there or not. > > In an earlier message (must be months ago) I stated that I do hear high > frequency components on each signal (SSB and CW) which is above S3 and > they > are related to the signals received. > The high component which I'm talking about can't be influenced (volume and > tone) by the RX-EQ so it looks like an uncontrolled side-effect. > > So my conclusion; > It's either coming from the K3 and totally independent from the headphones > used, or it's the combination K3 - Heil Pro set, or it's an oscillation > between my ears initiated by lids on the band (don't take the last one to > serious). > > (un)fortunately most hams can't hear above 10 Kc if we look at the average > age and the given statistics. So they won't notice these artifacts. > > Yes I do have an old headphone (no mic included) from Telex which doesn't > produce or show this effect. Either the combi K3 - Telex doesn't generate > the high frequency components or the Telex isn't able to make it audible. > > With this knowledge, and your question about the Heil I can do two things: > Say nothing or warn you just in case you are able to hear above 10 Kc. > > > BTW > Let me be clear, I do have 2 K3's, (SN0812 & SN2185, both have the same > issue) but I'm still very happy with them! Receiver performance and audio > are the most important points for me, not the bells and the whistles. I > hope > this audio issue will be solved once and the K3 will be perfect (for me). > Some issues will be solved, some never. Nothing is perfect, but the K3 > comes > close. > > Do whatever you like with this information, it is just my experience and > opinion > > 73's, Evert PA2KW > > ______________________________________________________________ > 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 > > -- View this message in context: http://n2.nabble.com/M1-M4-Quick-memories-tp3925899p3969775.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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
