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 arch...@mail-archive.com
