Hi Bill, Tnx for the input. I was focused on the KRX3 manual and had not checked out the K3 manual - duh!. One of these days I will learn that most of my questions have already been addressed in the manual.
It looks like there are advantages with either setup for the Sub Rx - Aux RF or KAT3 input. For listening on the low bands I like the option of tying RX Ant and Aux RF together. For monitoring a high band like 6M I like the idea of using Ant 2 on the Sub Rx input when the two receivers can be on two separate bands. Looks like there needs to be a relay control to switch the Sub Rx input between parallel with Main Rx, Aux RF and KAT3. I can dream. For now I will not hook up the Aux RF. 73, N2TK, Tony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill W4ZV Sent: Wednesday, August 13, 2008 1:34 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 KRX3 - BNC or KAT3? N2TK, Tony wrote: > > > I think this was addressed before with not having the KAT3. I do have the > KAT3. Is it recommended to hook up the BNC connector on the back to the > KRX3 or to use the second SO-239 on the K3 or does it make any difference? > > Most of the time I will be using the same antenna for both receivers. When > the K3 has the capability of having the two receivers on two different > bands > I would like to monitor another band with a second antenna. An example > would > be to monitor 6M. Figured I could use the second SO-239 for this. > > I assume that when I am listening to both receivers on the same band that > if > I am using the receive antenna input the receive antenna will go to both > receivers. Is this correct? > It's a little complex and depends on the exact combination of KAT3 and KXV3 options. First read page 37 of the new manual and then see pages 40-42 for diagrams of the option configuration you have. Assuming you have a KXV3 in addition to your KAT3, the following from page 42 applies: "K3 with KAT3 and KXV3 Figure 4 shows the antenna possibilities with both the KAT3 and KXV3 installed. The main receiver can use ANT 1, 2, or RX ANT IN. The sub receiver can either share the main receiver's RF source, or use its AUX RF input. The latter can be either the non-transmit KAT3 antenna or the AUX RF BNC connector, as described earlier. In either case, the sub receiver's antenna must be isolated from the transmitting antenna." If you do not have the KXV3, the following from page 41 applies: "K3 with KAT3 ATU The KAT3 internal ATU, which replaces the KANT3 antenna input module, provides a second SO239 antenna jack (ANT 2). As shown in Figure 3, relay K3 routes either ANT 1 or ANT 2 to the main RF path. The antenna not routed to the main path (the non-transmit antenna) can optionally be used as the sub receiver's AUX RF antenna. This requires that the two antennas connected to the KAT3 be well isolated from each other. If not, the sub receiver's carrier-operated relay may turn on during transmit. If this occurs, you must either move the two antennas farther apart, or not connect the sub receiver to the KAT3. It may be preferable to connect the sub receiver's auxiliary RF input to the AUX RF connector on the rear panel. A well-isolated receiving antenna can then be used with the sub receiver when required. (See CONFIG:KRX3, for sub receiver antenna setup.) I have the KXV3 but no KAT3 so my case is different still! 73, Bill -- View this message in context: http://n2.nabble.com/K3-KRX3---BNC-or-KAT3--tp722317p722457.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
