I am happy with the present "SUB" control functions.
I run diversity mode for eme (i.e. my main Rx receives vertical polarity 2m and the sub-Rx receives horizontal polarity 2m). I run in split mode to transmit using VFO-B, while my VFO-A stays tuned to 144.130 MHz. 144.130 is the center of a 60 KHz band that MAP65 receives. MAP65 runs JT65 to decode all signals inside the 60-KHz band.
I have yet to try diversity reception on HF, but have no reason for the radio functions to be modified for diversity mode. Both receivers need to be tuned to the same frequency when in diversity reception so the VFO-A display is adequate. When running the sub-Rx in non-diversity then VFO-B shows it if unlinked.
I vote no change. If this is to be changed then make it selectable as a CONFIG menu item (if that is possible).
The KRX3 makes adaptive polarity reception of eme possible. No other commercial radio is this possible that I am aware of. The IQ+ from HB9DRI is a dedicated dual-Rx 2m direct conversion SDR which works elegantly for this. But it is a special piece of equipment for only 2m-eme.
73, Ed - KL7UW ------------------------- Date: Tue, 05 Mar 2013 12:37:19 -0500 From: Richard Ferch <[email protected]> To: "[email protected]" <[email protected]> Subject: Re: [Elecraft] K3 - Eric &Co.... Please relocate the Link/UnLink button. Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed W4TV wrote: > The display is VFO B *not* KRX3 receive frequency - the icon says "[B]" > not "[SUB]". This is a key point. Ian's first post in this thread makes it clear that his mental model of the two displays is that they track the two receivers. This mental model may work with a dual-receiver K3 in non-diversity mode, but it is not the most appropriate mental model for a dual-receiver K3 in diversity mode. In diversity mode VFO B does not track with VFO A; it is the subRX that tracks with VFO A. In diversity mode, from the point of view of operating the radio there is a single receiver controlled by VFO A. This receiver uses twice as much hardware as a normal receiver, and it allows two simultaneous antenna inputs instead of only one, but operationally speaking it is a single receiver. In other words, a K3 in diversity mode is functionally similar to a single-receiver K3 or a dual-receiver K3 with the subRX turned off: VFO A always displays the receiver frequency, and the VFO B display indicates where the transmitter will transmit in SPLIT mode. Switching from a VFO A vs. VFO B display model (the current design) to a main RX vs. subRX display model, as Ian has suggested, would waste the capability of the VFO B display in diversity mode (what's the point of dedicating display real estate to a second frequency display if it is forced to be identical to the first display?). Having the VFO B display tell you where the transmitter would be if you invoked SPLIT, exactly the same as it does in a single-receiver K3, is a more effective use of the display resources, particularly for someone wishing to work a split pileup on low bands. 73, Rich VE3KI ______________________________________________________________ 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
