Wow Matt, Thank you, Thank you, Thank you. I've been off the air since
last Saturday trying to diagnose my problem. I had problems last
Saturday and people were saying my signal was breaking up. I originally
thought there was something wrong with my transceiver or settings. I
carefully traced everything and monitored output from the transceiver
and decided that although some settings could be improved (which I did)
that wasn't the reason. I then thought that perhaps the issue was the
1/2" of ice I had on the antenna that night, so after checking
everything else I decided to go back on the air tonight. And sure enough
my signal was breaking up again, even though it hadn't earlier during
testing. This time I even though I was wearing headphones and with the
background static I thought I heard a click from the amplifier. I was
(still am!) on a net at the time (HHH Net), so I qsy'd down 4 Khz and
did some testing, and I noticed the SWR kept going from 1.0 to much
higher values, with the amp kicking out.
I then remembered reading your email. Went back and read it again and
wondered if I was experiencing the same thing you were. Sure enough,
moved back to 1.09 and the problem is gone. Of course, there have been
some fixes after 1.09 for other problems I've experienced, so hopefully
Elecraft will get this one fixed soon.
Thanks again!
John
On 5/16/2014 10:06 PM, Matt VK2RQ wrote:
Elecraft is right on top of it; I'm also confident we'll have a solution fairly
soon.
73,
Matt VK2RQ
On 17 May 2014, at 1:52 pm, Ron Cowherd <[email protected]> wrote:
Yes, I have also had similar problems with the KXPA100 (SN#0876)and have
already composed and sent a letter to support. The letter is much too detailed
to reproduce here but I also suspected a firmware glitch. My unit was working
flawlessly until the upgrade. I'm sure the problem will soon be solved.
73, Ron K4GYD
Sent from my iPad
On May 16, 2014, at 6:56 PM, Matt VK2RQ <[email protected]> wrote:
How are people finding this new firmware?
I've been having problems recently with my KXPA100, where it intermittently
shows high SWR for a brief moment, and then either recovers or puts itself in
bypass. At first I thought I had an issue with my antenna, but I discovered it
was happening with a dummy load too. It mostly happens on SSB, but it happens
to a lesser extent CW. It also happens with both my KX3 with integrated cable,
and with my K2 using the keying line. I pulled the amp apart, looking for poor
connections and dry joints, but no success there. By gently blowing across the
mike, I was able to get it into the failure mode, and stay there. The SWR
bridge in the amp was reading high. I had a crossneedle SWR meter between the
radio and the amp, but as I blew progressively harder into the mike, the SWR on
the meter was low. Then, once the power applied reached a certain level, the
amp would come good again. This made me suspect whether the band auto-sensing
may have been switching in a wrong LPF?
Then last night, I reflashed the amp with release firmware 1.28, but still had
the problem. Then I downgraded the firmware on the amp from 1.28 to 1.09, which
was the release my amp was shipped with. I haven't observed or been able to
reproduce the problem since. This is now leading me to suspect a possible bug
in the 1.28 firmware?
I'm wondering if anyone else may have observed any strange glitches with the
1.28 firmware?
73, Matt VK2RQ
On 3 May 2014, at 2:14 am, Eric Swartz - WA6HHQ, Elecraft <[email protected]>
wrote:
KXPA100 Production Firmware MCU 1.28 has been released to production status and
is now shipping.
Important: This version of firmware has new features that require the very
latest KXPA100 Utility.
We recommend all KXPA100 owners upgrade to the latest KXPA100 utility and to
KXPA100 MCU 1.28.
Some of the Key Changes in this release:
- Better tolerates forward and reflected power overshoot for brief periods to
support external antenna tuners. Use approximately 10-20 watts of KXPA100
output when tuning.
- When the attenuator is acquired because of SWR or high reflected power,
release attenuator immediately on next key up if SWR has been reduced to 3:1 or
less.
- Update band voltage tables for ICOM 703 and Yaesu FT-817
- Reduce power required for ATU tune.
- Add per-band Antenna configuration (requires the new KXPA Utility for user
interface)
- Improved RS232 handling for 3rd party applications. (Ham Radio Deluxe v6.2,
PigKnob, etc.)
73,
Eric
elecraft.com
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