Is that the addition across R91 if R91 is greater that 22 ohms? IF out would affect the P3, not audio volume, right?
Mike NF4L On Oct 31, 2012, at 5:55 PM, Brian Alsop <[email protected]> wrote: > If one looks at the schematic there is a JFET buffer between the IF and > the IF out in the main RX. Isolation and impedance matching is its > function. There is no stock IF out for the subrx and hence no JFET. > > JFETs have really high input impedances. > > A one resistor "gain mod" is on the K3 site reduces the signal loss in > this JFET stage for those using the IF output jack. > > 73 de Brian/K3KO > > On 10/31/2012 21:10, ab2tc wrote: >> Hi, >> >> I have absolutely no dip in the center of my LP-Pan display and I have never >> heard anybody else having this problem either. The IF out port and the >> crystal filter bank are driven in parallel by a buffer amplifier that >> appears to be capable of driving both without gain loss due to the crystal >> filter load. >> >> AB2TC - Knut >> >> >> Edward R Cole wrote >>> I built my K3/10 and installed the KRX3 with no issues of different >>> audio levels. >>> >>> BTW running both Rx with dual LP-Pan on MAP65v2.3 sw shows the audio >>> level on a bar graph for each (when in diversity mode). >>> >>> Two things were recently done to improve use of the >>> LP-Pan: 1) Enabling an open filter position in the K3 and KRX3 >>> eliminates gain "suck out" by roofing filter which is connected in >>> parallel with the IF output jack. It shows as a dip in gain on a >>> panadaptor spectrum display at center freq. 2) Installed 32.860 MHz >>> xtal in LP-Pan which is 4x the IF freg of 8.215 MHz which eliminates >>> the previous +6 KHz freq. off set in the display sw (thanks to Larry, >>> N8LP). >>> >>> My 2m-eme dual-polarity adaptive receive system will get a work-out >>> in this weekend's eme contest. It extensively uses the dual-Rx >>> diversity reception mode of the K3. >>> >>> 73, Ed - KL7UW >> >> >> >> >> >> -- >> View this message in context: >> http://elecraft.365791.n2.nabble.com/KRX3-insatall-tp7564774p7564863.html >> Sent from the Elecraft 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 >> >> >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 2012.0.2221 / Virus Database: 2441/5365 - Release Date: 10/31/12 >> >> > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2221 / Virus Database: 2441/5365 - Release Date: 10/31/12 > > ______________________________________________________________ > 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
