Folks - Looks like this thread has way drifted OT. Let's close it for now.
I also gave the original poster a call and his KPA1500 is OK. He made some new
changes external to the 1500 based on list comments and the problem is no longer
present. We'll stay in touch with him to make sure he
On 10/1/2019 2:12 AM, David Wilcox wrote:
A trip to Palomar Engineers with a description of your set up will help so
they can sell you the correct EMI suppression toroid set up.
NO! This company doesn't have a clue, is selling the wrong components,
and for very high prices.
73, Jim K9YC
You have to use the best quality connecting cables. A trip to Palomar
Engineers with a description of your set up will help so they can sell you the
correct EMI suppression toroid set up. And, YES, even some of Elecraft’s
cables can be (or become) defective as described in this site. A
And not just antenna and feedlines, but the AC wiring in your shack, the
potential EMI problems, etc. This is why I keep saying that hams badly need a
tutorial -- perhaps something named, "What to Expect When You Run High Power".
There are lots of us, including me, that could learn about the
From: elecraft-boun...@mailman.qth.net on
behalf of David Gilbert
Sent: Friday, September 27, 2019 4:45:55 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 failing on 160...AGAIN!
I've probably posted this here before, but I once had a 160m Inverted-V
at 70 feet
I've probably posted this here before, but I once had a 160m Inverted-V
at 70 feet that didn't have a DC ground. As a thunderstorm approached
(but was still several miles away) I reached down to short the coax end
in the shack and drew a heavy blue 2 inch long arc that traveled from
the end
It's from my head. I have a BVT - it's DC so the 4K is a DC claim. I
BVT cables used here in the shack as a fast way to ensure I don't have
some microscopic wire or filing or whatever down in a connector - stuff
like that is a nightmare to troubleshoot.
At one point I tried to use a PL259
For those with insulated verticals, the potential gradient is about 100
V/meter. That varies with humidity and altitude. But, you get the picture.
In dry climates like here in NM, this is a big deal for commercial broadcast
AM antennas. Even with the transmitter shut down, unless there is a
Few of us can guarantee dry air for our antenna connections. Where is this data
from?
For the question “Has anyone tested them?”, I expect that Amphenol tests to the
published specs. Those tests would be over the entire temperature range in the
data sheet. If you visit the data sheets I linked
On 9/27/2019 12:00 PM, Jeff Blaine wrote:
One thing I can say from personal experience is that if you have a tall
or long antenna, you definitely need a static bleed on that bad boy.
YES! After experiencing multiple shorts of Polyphaser arrestors on high
wires, I've switched to the arrestors
I'm going to partially disagree with Jim :)
I agree on good quality connectors, when you have them.
I can honestly say I have yet to have a none-Amphenol fail since I learned
to solder them in 1972.
I can also honestly say I have had a connector fail when I did not assembly
it correctly. This
I don't doubt the AMP connector is great but doubt this issue is due to
a connector.
One thing I can say from personal experience is that if you have a tall
or long antenna, you definitely need a static bleed on that bad boy.
Never really gave those stories much credence but a number of
On 9/27/2019 11:01 AM, j...@kk9a.com wrote:
If PL-259s are failing they are either poor quality connectors or there
are serious antenna issues causing excessive voltage.
YES! Only first quality connectors and adapters should be used.
I run legal limit to resonant antennas fed with 50 ohm and
Yes and without proper lightning protection or static build-up
prevention on a feedline, a nearby strike can induce 4KV+ on the antenna
and feedline. A flash-over will likely leave a carbon trace that will
be followed by a few 100 watts of RF. It only gets worst, not
better. On more than
PL259/SO239 BDV is around 4KV in dry air.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 9/27/19 1:01 PM, j...@kk9a.com wrote:
5000 watts is 500 volts rms with a perfect antenna system. I suspect
that PL-259 connectors really can withstand much more than 500 volts.
Has anyone tested
5000 watts is 500 volts rms with a perfect antenna system. I suspect
that PL-259 connectors really can withstand much more than 500 volts.
Has anyone tested them? My station has a mixture of UHF, N and DIN
connectors and all have worked perfectly for 1500 watts HF. If
PL-259s are failing
This would be a lot easier with a public support forum, but I understand why
Elecraft might not want to take that on.
The mailing list is awesome, but it isn’t a very good database.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Sep 27, 2019, at 6:42 AM,
I just fixed a very similar problem with my station - I could run 100
watts to my Carolina Windom all day, but it failed instantly at 1500
watts. The problem turned out to be a very nice-looking
factory-installed PL-259 feeding the antenna. Looking inside revealed
carbon tracking, etc., so
n SWR bridge/monitor. It looked okay, and
>>> was finger tight, but when I replaced it in an A/B test, the problem went
>>> away.
>>>>
>>>> The other time, the antenna had changed its impedance curve, but was
>>> still 'okay' and the tuner was trying to ret
N5CQ
> > >
> > >
> > > -Original Message-
> > > From: elecraft-boun...@mailman.qth.net <
> elecraft-boun...@mailman.qth.net>
> > On Behalf Of Jim Brown
> > > Sent: Friday, Sept
ance curve, but was
> still 'okay' and the tuner was trying to retune for it.
> >
> > 73 John N5CQ
> >
> >
> > -Original Message-
> > From: elecraft-boun...@mailman.qth.net
> On Behalf Of Jim Brown
> > Sent: Friday, September 27, 2019 4:19 AM
I would request that any solution one finds for their KPA-1500 failing, be
posted on this forum, even if it's (typically like me) cockpit error.
We have seen many "My KPA-1500 died" listings.
These are obviously quite disconcerting to us potential buyers (again like
me).
Often, the original
im Brown
> Sent: Friday, September 27, 2019 4:19 AM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] KPA-1500 failing on 160...AGAIN!
>
>> On 9/26/2019 10:26 PM, Peter Dougherty wrote:
>> Any idea where to start looking here?
&
Of Jim Brown
Sent: Friday, September 27, 2019 4:19 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 failing on 160...AGAIN!
On 9/26/2019 10:26 PM, Peter Dougherty wrote:
> Any idea where to start looking here?
And if it's a vertical, what about the radial system?
73, Jim K
On 9/26/2019 10:26 PM, Peter Dougherty wrote:
Any idea where to start looking here?
And if it's a vertical, what about the radial system?
73, Jim K9YC
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
On 9/26/2019 10:26 PM, Peter Dougherty wrote:
Any idea where to start looking here?
What is the antenna? The feedline? Is the antenna resonant? Is there a
serious common mode choke at the feedpoint? (See
http://k9yc.com/2018Cookbook.pdf ) Is it matched to the feedline at the
frequency (ies)
What happens with a dummy load? If it doesn’t fail, then the problem is in the
antenna. The KPA may be more sensitive to a short period of high SWR than the
K3.
Victor 4X6GP
> On 27 Sep 2019, at 8:26, Peter Dougherty wrote:
>
> My KPA is once again repeatedly failing on 160m. I haven't used
My KPA is once again repeatedly failing on 160m. I haven't used it on
Topband since about the end of March, when it was fine. My antenna is
checking out fine on my AA-230 ZOOM analyzer, and I can run 100W into the
antenna from the K3s with no problem.
I'm getting FAULT: PWR REFL on every keydown
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