Thanks -this is helpful information. If going the hardware route, I am inclined to implement the logic via an RS-232 wedge device vs implementing a BAND0-3 device (basically an antenna switch).
73, Cliff K3LL/6 -----Original Message----- From: Dick Dievendorff [mailto:d...@elecraft.com] Sent: Monday, November 16, 2015 9:36 PM To: Cliff Frescura Cc: Cady, Fred; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning 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
