> Yes but unless the response remains that way when an 8 ohm > speaker is there its not a very useful measurement.
Since the speaker coupling capacitors are 470 uF, the roll off at 100 Hz with 8 Ohm speakers is 3 dB. That's completely acceptable for a communications receiver ... and probably less LF roll off than you will observe due to the speaker enclosure. 73, ... Joe, W4TV > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Brett Howard > Sent: Sunday, September 20, 2009 7:42 PM > To: Ignacy > Cc: [email protected] > Subject: Re: [Elecraft] [K3] K3 Audio Response - Version 3.33 Firmware > > > Yes but unless the response remains that way when an 8 ohm > speaker is there its not a very useful measurement. > > ~BTH > > On Sun, 2009-09-20 at 07:56 -0700, Ignacy wrote: > > Is this measured with high impedance probes? If I remember > correctly, > > small caps limit low-frequency response of K3 especially with low > > impedance phones/speakers. Ignacy > > > > > > As a further experiment, I just added 3 dB to Rx bands 1-3 and the > > response is now essentially +/- 0dB between 20Hz and 3.5 kHz in SSB > > through the 6K filter and Fc = 1.35. You can lay the ruler flat on > > the response. > > > > http://216.229.20.37/images/K3-V333-EQ.jpg > > > > Paul, W9AC > > > > ___ > > > ______________________________________________________________ > 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 ______________________________________________________________ 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
