> On Tue, Sep 27, 2011 at 1:21 PM, Leigh L. Klotz, Jr. WA5ZNU < > [email protected]> wrote: > >> Brian, >> >> The question here was about why Dick has found that the best spot for TX >> and the best spot for RX aren't the same spot. I theorized that perhaps >> it's not using the same filter for TX and RX. In my rig, it is. In >> your >> K2 it's using the wide filter as well. >> > > If it is the same filter AND they use all the same injection frequencies, > then it should be symmetrical. In the case of the K2, it uses different > filters and different injection frequencies. The wide SSB filter is used > for > TX but it uses the adjustable CW filter when doing narrow passbands. > > But, like I said, I got tired of dealing with that and no longer have a > problem with filter nonlinearity.
Yes, with the K2 (which I have) there is an annoying 10Hz or so max shift when switching filters and you have to retune or click; the QSY button actually helps deal with that, which is another reason I put it in. I share Dick's goal of making sure that when hams set up fldigi for good RX that they aren't lulled into bad TX. And so I think that if you've set up your rig's filters such that the peaks are at the same spot (+/- 10 Hz) you're not going to get into a situation where your click off the sweet spot and TX and get overdriven, since in general the filters will have less sensitivity away from your chosen spot. I'm glad you're having good luck with the SDR. I have a few different ones for RX but none of the Flex series, and am a contributor on quisk. Leigh/WA5ZNU _______________________________________________ fldigi-alpha mailing list [email protected] https://lists.berlios.de/mailman/listinfo/fldigi-alpha
