If the band lines are used only, the ATU picks a mid band freq if there is no history since last ATU power up. On first tx after that, it performs a memory recall tune using the counted freq.
Power up means DC power applied. A k3 can provide approx freq on RX thru the ACC cable, depending on a menu setting Dick, K6KR > On Nov 15, 2015, at 16:20, Cliff Frescura <c...@cfcorp.com> wrote: > > I went back and reviewed the KAT500 command set and it doesn't look like > this is possible because the serial protocol does not have a way to > communicate split status. I've been knee deep in the KPA500 serial protocol > (with great results thanks to Jack W6FB) and thought they may have some high > level similarities, but not really. > > Do you know how the KAT500 interprets frequency, if driving only the band > data lines (BAND0-3) via an external TTL device? Does it pick middle of the > band if there is no last used frequency? > > 73, > > Cliff K3LL > > -----Original Message----- > From: Cliff Frescura [mailto:c...@cfcorp.com] > Sent: Sunday, November 15, 2015 2:58 PM > To: 'Cady, Fred'; 'Elecraft@mailman.qth.net' > Subject: RE: [Elecraft] KAT500 Re-Tuning > > Apparently yes. However, I'm using the KAT500 serial port to communicate > frequency to the KAT500 via logging software (DXLabs), not auxBus, since the > radio is not a K3/S. > > 73, > > Cliff K3LL > > -----Original Message----- > From: Cady, Fred [mailto:fc...@montana.edu] > Sent: Sunday, November 15, 2015 2:28 PM > To: Cliff Frescura; Elecraft@mailman.qth.net > Subject: Re: [Elecraft] KAT500 Re-Tuning > > Are you asking for the KAT500 to choose two different tuning solutions when > operating split? At present it chooses the VFO B frequency for its solution > according to: > > MCU 4.83 / DSP 2.82, 2-8-2014 > > * FSK-D (RTTY) POWER-CONTROL BUG FIX: Power output can now be increased > while in transmit mode when using FSK-D. > > * KAT500 ATU SUPPORT: Automatic retuning of KAT500 LC network as K3 VFO is > moved. VFO frequency messages are sent via the auxBus. Sends VFO A frequency > except in SPLIT mode, where VFO B frequency is sent. > > Cheers, > Fred KE7X > www.ke7x.com for all KE7X Elecraft books. > ________________________________________ > From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Cliff > Frescura <c...@cfcorp.com> > Sent: Sunday, November 15, 2015 3:09 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KAT500 Re-Tuning > > Antenna issues specific to the OP aside, there is a valid reason to have the > KAT500 recognize split and inhibit retuning/recall. > > The need for this functionality is very apparent when running split on 40m > SSB when the DX is below 7.1 MHz and listening up much higher than 5KHz for > anyone using a narrow bandwidth 40m antenna. Consider that the KAT500 > already tuned the antenna on your TX, so the "fix the antenna solution" > doesn't apply. Listening ~50KHz away should not require any retuning since > the tuner's settings at your TX should be good enough for RX. > > Here is how it would work: > > 1. When the KAT500 sees a *transition* from split off to split on... > a. The KAT500 would recall settings for TX Frequency or retune > (under the VSWR settings condition) when it sees RF for the first time after > this split transition 2. When split is on (Split mode) > b. The tuner should not change any settings regardless of > frequency/band - except under VSWR conditions based on settings. > c. Perhaps both the "Auto" and "Man" indicators would be on in order > to indicate this mode on the KAT front panel. > 3. When the KAT500 sees a transition from split on to split off then go into > "normal" (non Split) mode. > > The main reason I am using the tuner is because of a compromise antenna. If > the antenna was flat enough across the band I wouldn't even engage it. In > my specific situation there is also at KPA500 connected, so the way that the > KAT500 works today will result in the KAT inhibiting the KPA while it > retunes/recalls. Although fast, I suspect that the amp is not engaged > initially when I send (speak) my call sign in the pile. On very rare > occasions there is also a KPA VSWR Fault. While probably not an issue, the > amount of relay chatter in very short period of time between fast RX/TX/RX > transitions is a bit unsettling. > > 73, > > Cliff K3LL > > > -----Original Message----- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim > Brown > Sent: Sunday, November 15, 2015 10:04 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KAT500 Re-Tuning > >> On Sat,11/14/2015 8:37 PM, Byron Peebles wrote: >> I will put the antenna analyzer on it tomorrow and make sure it's >> still solid after all this wind. > > Other suggestions. First, put it on bypass and see what the SWR indication > is. If it's reasonable, go to MAN mode, force a tuning (put > K3 in TUN mode) and let it tune. > > Carefully check the entire coax path between K3 and the antenna. All > connectors should be finger tight, then tighten with gas pliers. > > Any indication that the coax is wet? Moisture entering anywhere along the > run will usually migrate all the way down to the lowest point. Open > connectors to see if there's any moisture. A good way to test is to use a > tissue or paper towel as a probe. > > If you have TDR capability, look at the feedline for any discontinuities. > You should see connectors, the antenna, and any switching between the > antenna and your test point. Most vector analyzers can do TDR. If you don't > have one of them, ask around your ham neighbors to borrow one (and ask them > to help you do the measurement). > > 73, Jim K9YC > ______________________________________________________________ > 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 Message > delivered to c...@cfcorp.com > > > > > ______________________________________________________________ > 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 Message > delivered to fc...@montana.edu > > > > > > ______________________________________________________________ > 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 > Message delivered to d...@elecraft.com ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
