Hi Mark, A very good new !
As answered to Alan, i will read these info and a great attention to your uploaded notes! Many thanks for sharing your experiences ! If there are no performances degradation on the main rcvr (IF feed trough, etc) i'm ready to envisage the "jump" ! 73 QRO Rudolf, HB9ARI Mark n2qt wrote: > Rudolf, > > I used the info provided by W3SZ successfully and uploaded pictures > and notes to > the files section that may help you plan the modifications. > http://groups.yahoo.com/group/Elecraft_K3/files/KRX3_IF_Out/addSubRX_IF.txt > > > It works well! > > Mark n2qt > > > ----- Original Message ----- From: "Alan Bloom" <a...@elecraft.com> > To: "hb9ari" <hb9...@bluewin.ch> > Cc: "Elecraft-forum" <Elecraft@mailman.qth.net> > Sent: Tuesday, May 25, 2010 9:48 PM > Subject: Re: [Elecraft] K3 Sub-receiver use > > >> Hi Rudolf, >> >> At the bottom of this message I will copy a posting from W3SZ on the >> LP-PAN email list that describes how he added IF output to his K3 >> sub-receiver. He used the Z10000 buffer amp from Clifton Labs: >> http://www.cliftonlaboratories.com/z10000_buffer_amp.htm >> >> If you don't mind modifying your K3, it looks like that should allow you >> to use the sub-receiver with a P3. When I get time I'll have to try it >> on my K3 and see how it works. >> >> Alan N1AL >> >> >> >> On Tue, 2010-05-25 at 22:01 +0200, hb9ari wrote: >>> Hi Rich, >>> >>> Very bad news ! >>> >>> That was my 1st idea when ordering the P3 >>> to use it for "wide" span use for phone mode. >>> (50Mhz in priority during possible "apertures") >>> For digi mode, as JT65, the ~2kHz width >>> of "waterfall" is 100% sufficient, because >>> frequencies are well defined (for ex 14.076Mhz) >>> I'm quite sure now that it was a bad idea to have ordered >>> a P3 but, with your accurate explanation, i will >>> renounce to the sub-receiver ordering (and >>> roofing filters)! >>> >>> I regret that a P3 connection to the sub-rcvr >>> is not possible, and, as i'm not an RF engineer, >>> i don't understand the reason(s)! >>> >>> At my point of vue, it's not 100% correct to say that >>> the KRX3 is like a 2nd receiver ! >>> >>> Just in time to stop for the KRX3 ordering but for the P3... >>> may be eBay ? >>> >>> My best 73, >>> Rudolf, HB9ARI >> >> ============================================================ >> >> -------- Forwarded Message -------- >> From: w3sz <w...@comcast.net> >> Reply-to: lp-...@yahoogroups.com >> To: lp-...@yahoogroups.com >> Cc: w...@comcast.net >> Subject: [LP-PAN] KRX3 IF tap up and running >> Date: Fri, 02 Jan 2009 00:56:35 -0500 >> >> Hi Larry, >> >> I didn't get a chance to hook up the LP-Pans yet [because the audio >> cables I need are up at my hilltop QTH], but I did install the KRX3 >> and its Z10000 buffer amp, and both the main K3 IF output and the KRX3 >> subreceiver IF output seem to be working fine. I ran the main IF to >> the main receiver on my Flex5000 and the KRX3 subIF to the subreceiver >> on the Flex5000. >> >> Everything seems to be OK in terms of how I chose to get the IF from >> the KRX3. >> >> I am working a long day tomorrow as well as Saturday AM, but I am >> hoping to get a chance to run up to the hilltop and pick up the audio >> cables and then get the LP Pans hooked up Saturday afternoon. >> >> This is a brief summary of what I did with the KRX3: >> >> I used the Z10000 as buffer amp inside the KRX3. >> >> I got +12V from a 12SA pad near to P86A. >> Power and RF connections to the Z10000 were done from the underside of >> the Z10000. >> >> I took IF output from KRX3 from P86A and used RG174U to take this to >> input of Z10000. >> >> I mounted Z10000 on an unused FL position using a 1/2 inch standoff. >> >> I mounted a dual female SMA connector in the REF hole at the bottom >> corner of the K3 just below the official IF out BNC. I then used a >> right angle premade small surplus coaxial cable to take the signal to >> the KRX3 and thus the Z10000. >> >> I entered the KRX3 at the back left corner opposite to J92, because >> there was already an opening there. >> >> I ran the coax inside the KRX3 bottom shell, beneath the main KRX3 >> PCB. I brought it up to the Z10000 by running it through an unused >> hole meant for an FL standoff. >> >> At first check, using the two subreceivers on the Flex5000 to receive >> the IF signals from the K3, the main K3 and the KRX3 subreceiver IF >> outputs seem to be equivalent. >> >> When constructing the Z10000, I used the -U [Universal] options, not >> the K2 options. I chose to set it up for zero gain, and thus chose >> R907 to be 499 ohms, and R905 to be 4.7K, as per section 2.3.3 of the >> Z10000 manual. >> >> I attached a jpg file with the two IFs from the K3 going to the Flex >> 5000. The K3 main IF goes to the main Flex receiver and the DRX3 sub >> IF goes to the Flex sub receiver. The signal is Radio Moscow on 40 >> meters. >> >> 73, >> >> Roger Rehr >> W3SZ >> http://www.nitehawk.com/w3sz >> >> >> >> ______________________________________________________________ >> 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
