[Elecraft] High SWR on KPA500

[Jerome Svinicki]

I have noticed that the SWR reading on one of my two KPA500s will show almost 
1.8:1 while the KAT500 show 1:1.  My other KPA500 does not exhibit this 
behavior.

   It would seem to me that if the KAT500 has tuned out the SWR and 
indicates a 1 to 1 match then the KPA-500 should also show a low SWR.

  And as I said my other KPA500 when I put it in-line with the same cables does 
not have this SWR inconsistent with the KAT-500.

  Do you have any ideas of something I can look for?

  73's  /Jerome /K8LF
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Re: [Elecraft] High SWR/Low Power out on K3S

[Harry Yingst via Elecraft]

Loose connection between the so239 and the tuner board?



 Original message 
From: Dean Blair <k...@bellsouth.net> 
Date: 2017-02-16  8:02 PM  (GMT-05:00) 
To: elecraft@mailman.qth.net 
Subject: [Elecraft] High SWR/Low Power out on K3S 

Hi,

Just curious if others had this issue and could resolve it.

My K3S had suddenly started showing High SWR faults with resulting low power 
out due to rollback even when the autotune reads 1.0-1.  Different dummy loads, 
antennas, and coax jumpers change nothing.  I upgraded the firmware to the most 
current release and still no change.

Any suggestions?

Dean ~ K2JB

Sent from my iPhone
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Re: [Elecraft] High SWR/Low Power out on K3S

[Don Wilhelm]

Dean,

It sounds like you have an intermittent connection somewhere.  Contact 
K3support for the best analysis.


73,
Don W3FPR

On 2/16/2017 8:02 PM, Dean Blair wrote:

Hi,

Just curious if others had this issue and could resolve it.

My K3S had suddenly started showing High SWR faults with resulting low power 
out due to rollback even when the autotune reads 1.0-1.  Different dummy loads, 
antennas, and coax jumpers change nothing.  I upgraded the firmware to the most 
current release and still no change.


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[Elecraft] High SWR/Low Power out on K3S

[Dean Blair]

Hi,

Just curious if others had this issue and could resolve it.

My K3S had suddenly started showing High SWR faults with resulting low power 
out due to rollback even when the autotune reads 1.0-1.  Different dummy loads, 
antennas, and coax jumpers change nothing.  I upgraded the firmware to the most 
current release and still no change.

Any suggestions?

Dean ~ K2JB

Sent from my iPhone
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[Elecraft] High SWR below 40 meters

[Jan Ditzian]

My K3 has been having RF feedback problems with an 80 meter antenna.  In 
order to resolve things, I built an 80-meter dipole to use as a test 
antenna.  While all this was happening, over the past few months, I also 
added a used KAT-3 tuner and a KXYN3A to replace the original synthesizer.


After building the dipole, I was puzzled that it would not tune up on 
80.  I do not know why it took me a week, but I finally checked out the 
rig on my dummy load.  It shows a high SWR on the dummy for all 
wavelengths greater than the 40-meter band--60, 80, and 160. The rig 
works just fine on 14 mHz. and up, and I can certainly tune it up on 40 
meters.  Further checking shows that there is no output on 60-160, 
whether using the Tune mode at 5 watts or CW mode at 70 watts.


I have no idea when or why this happened, but I really need to know the 
how it happened, so I can fix it.  Can someone give me some guidance on 
what to look at to figure this out?  It is possible that resolving this 
problem will also result in a resolution of the RF feedback problem, 
although I won't count on that.


73,

Jan, KX2A
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Re: [Elecraft] High SWR below 40 meters

[George Dubovsky]

Now that you have a KAT-3, you have 2 antenna ports. Is there any chance
that the wrong one is selected for those bands?

73,

geo - n4ua

On Mon, Dec 14, 2015 at 4:27 PM, Jan Ditzian  wrote:

> My K3 has been having RF feedback problems with an 80 meter antenna.  In
> order to resolve things, I built an 80-meter dipole to use as a test
> antenna.  While all this was happening, over the past few months, I also
> added a used KAT-3 tuner and a KXYN3A to replace the original synthesizer.
>
> After building the dipole, I was puzzled that it would not tune up on 80.
> I do not know why it took me a week, but I finally checked out the rig on
> my dummy load.  It shows a high SWR on the dummy for all wavelengths
> greater than the 40-meter band--60, 80, and 160. The rig works just fine on
> 14 mHz. and up, and I can certainly tune it up on 40 meters.  Further
> checking shows that there is no output on 60-160, whether using the Tune
> mode at 5 watts or CW mode at 70 watts.
>
> I have no idea when or why this happened, but I really need to know the
> how it happened, so I can fix it.  Can someone give me some guidance on
> what to look at to figure this out?  It is possible that resolving this
> problem will also result in a resolution of the RF feedback problem,
> although I won't count on that.
>
> 73,
>
> Jan, KX2A
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Re: [Elecraft] High SWR below 40 meters

[Jan Ditzian]

George and Jim,

8 minutes after my post hit the reflector, I received the following two 
e-mails.



George: "Now that you have a KAT-3, you have 2 antenna ports. Is there 
any chance that the wrong one is selected for those bands?"


Jim:  "Antenna selection is per band. Perhaps you have the wrong antenna 
selected for those bands."



There ya go!  New dipole tunes up.  Probably did nothing for the RF 
feedback on the vertical, though, hi.


Thanks to both.

73,

Jan, KX2A
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Re: [Elecraft] High SWR no power out

[Vic Rosenthal 4X6GP/K2VCO]

Make sure the cable to the dummy load is good.

I presume you connected the cable to ANT 2 when you selected it? If not, 
try it.


If it is OK on one antenna, take off the cover and check that the 
antenna connector that doesn't work is plugged into the KAT3 as it 
should be.


Does this happen on all bands? That will tell you if there is a problem 
in the lowpass filters or the KAT3.


73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 5 Nov 2015 17:23, WR5DC wrote:

 I have a K3 that quit transmitting on SSB last night so I connected an
SWR/Wattmeter/Dummy Load directly to Antenna 1.  I held down the xmit button
and the display reads 16 watts. 99-1  high swr.   I have the optional
antenna tuner but it is in the bypass mode.   I also tried selecting ANT2
with the same results..   Anyone have any ideas before I send it back to the
factory for repair?



Dennis WR5DC


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[Elecraft] High SWR no power out

[WR5DC]

I have a K3 that quit transmitting on SSB last night so I connected an
SWR/Wattmeter/Dummy Load directly to Antenna 1.  I held down the xmit button
and the display reads 16 watts. 99-1  high swr.   I have the optional
antenna tuner but it is in the bypass mode.   I also tried selecting ANT2
with the same results..   Anyone have any ideas before I send it back to the
factory for repair?

 

Dennis WR5DC

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[Elecraft] High SWR

[DK5EW]

Hi all,
I used my K3 only with transverter on 2m. Now the 6m season is starting 
and I connected it to my 6m beam.
On 50 MHz as I pushed TX I got high SWR message. K3 SWR meter showing 
3:1 bad SWR.
I measured with my mini vna analyser the antenna and it is perfect. SWR 
real is 1:1
So it must be a failure in the K3 ?
Yes I have a tuner build in BUT thought SWR must be perfect without tuning ?
Or is it necessary to use tuner if build in ? When I tune SWR is 1:1.1
Please further info if possible.

-- 
best regards
Erwin/DK5EW

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Re: [Elecraft] High SWR

[DK5EW]

TNX all for private messages.
I got the hint to bypass the tuner. Then the real SWR is shown .
73's Erwin/DK5EW
http://www.dk5ew.de

Am 22.04.2012 15:35, schrieb DK5EW:
 Hi all,
 I used my K3 only with transverter on 2m. Now the 6m season is starting
 and I connected it to my 6m beam.
 On 50 MHz as I pushed TX I got high SWR message. K3 SWR meter showing
 3:1 bad SWR.
 I measured with my mini vna analyser the antenna and it is perfect. SWR
 real is 1:1
 So it must be a failure in the K3 ?
 Yes I have a tuner build in BUT thought SWR must be perfect without tuning ?
 Or is it necessary to use tuner if build in ? When I tune SWR is 1:1.1
 Please further info if possible.

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[Elecraft] High SWR into Dummy load

[DBellW6AQ]

Hi, I just finished putting together my 2nd K3,  downloading all the 
firmware, etc., and find that while everything seems to work  fine, my SWR is 
astronomical -- like 15 to 1 after the antenna tuner has looked  for a good 
match, and that's into a 50 ohm Elecraft dummy load.
 
This is a K3-10, with KAT3, KDVR3, KXV3A, KIO3,  KUSB.
 
Before I tear it apart again, I'm just wondering  if there's something 
obvious that I'm overlooking.
 
Thanks in advance for any  suggestions.
 
73, Dave
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Re: [Elecraft] High SWR into Dummy load

[Robert Friess]

Wrong ANT port?

Bob

On Sun, Feb 13, 2011 at 11:51 AM, dbellw...@aol.com wrote:

 Hi, I just finished putting together my 2nd K3,  downloading all the
 firmware, etc., and find that while everything seems to work  fine, my SWR
 is
 astronomical -- like 15 to 1 after the antenna tuner has looked  for a good
 match, and that's into a 50 ohm Elecraft dummy load.

 This is a K3-10, with KAT3, KDVR3, KXV3A, KIO3,  KUSB.

 Before I tear it apart again, I'm just wondering  if there's something
 obvious that I'm overlooking.

 Thanks in advance for any  suggestions.

 73, Dave
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Re: [Elecraft] High SWR into Dummy load

[Don Wilhelm]

  Dave,

Check the coax between the K3 and the dummy load.  Best check is to 
connect an antenna analyzer to the end connnected to the K3 with the 
dummy load on the other end.

Do you have the coax connected to the right antenna port?

73,
Don W3FPR

On 2/13/2011 2:51 PM, dbellw...@aol.com wrote:
 Hi, I just finished putting together my 2nd K3,  downloading all the
 firmware, etc., and find that while everything seems to work  fine, my SWR is
 astronomical -- like 15 to 1 after the antenna tuner has looked  for a good
 match, and that's into a 50 ohm Elecraft dummy load.

 This is a K3-10, with KAT3, KDVR3, KXV3A, KIO3,  KUSB.

 Before I tear it apart again, I'm just wondering  if there's something
 obvious that I'm overlooking.

 Thanks in advance for any  suggestions.

 73, Dave
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Re: [Elecraft] High SWR into Dummy load

[Matt Zilmer]

Make sure you have the ATU and coax to ANT1, 2 hooked up right.  You
can be a good view of this from the outside.

matt W6NIA

On Sun, 13 Feb 2011 14:51:36 -0500 (EST), you wrote:

Hi, I just finished putting together my 2nd K3,  downloading all the 
firmware, etc., and find that while everything seems to work  fine, my SWR is 
astronomical -- like 15 to 1 after the antenna tuner has looked  for a good 
match, and that's into a 50 ohm Elecraft dummy load.
 
This is a K3-10, with KAT3, KDVR3, KXV3A, KIO3,  KUSB.
 
Before I tear it apart again, I'm just wondering  if there's something 
obvious that I'm overlooking.
 
Thanks in advance for any  suggestions.
 
73, Dave
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[Elecraft] High SWR solved!

[DBellW6AQ]

Just FYI, I have antenna 1 on the back panel  plugged into the antenna 2 
plug and vice versa.  Now, do I take it apart  and fix it, or remember they're 
reversed?  Just kidding.
 
73, Dave
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[Elecraft] High SWR on 20 and 40

[dw]

I have done this in the past to deal with ladder line length on multi
band use.
cut the following lengths of ladder line.

1 foot
2 foot
4 foot
8 foot

Solder alligator clips on all ends

By using these in combinations, you now have the ability to increase
your line length from 1-15 feet.
Test SWR on the offending bands while adding increments of 1 foot at a
time.
The fact that you are finding the high SWR on both 20 and 40 could
indicate a high impedance point at the input end in 1/4 wave increments.
15' will be an even 1/8 wave on 40 and an even 1/4 wave on 20.
Adding some length of line might push this away from the input end on
both bands.

I will guess that 6' or 9' will be a good numbers to add.

Duane
-- 
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[Elecraft] High SWR problem

[Rob May]

All has been fine with my K3 until today.  The display is indicating  High 
SWR when I transmit on SSB.  The KAT3 indicates a 1.0:1 match, but the when I 
transmit the swr meter is high and I get the high swr message on the screen.  
If I turn it down to 5 watts and send a tone with Digipan, the swr is fine, but 
turn it up to 100 watts and the swr is back up.  Nothing obvious has changed, 
the antenna is 2:1 on my analyzer with no tuner.  If I bypass the antenna 
tuner, the bar graph meter on the K3 shows about 2:1.  But if I switch in the 
KAT3 and tune, it indicates 1.0:1 but when I transmit it's high.  I've swapped 
coax jumpers between the radio and the antenna with no difference.  Thanks for 
any suggestions.
Rob
NV5E

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Re: [Elecraft] High SWR problem

[Don Wilhelm]

Rob,

You may have something in your antenna system that is arcing at high 
power, but is working just fine at low power.


73,
Don W3FPR

Rob May wrote:
All has been fine with my K3 until today.  The display is indicating  
High SWR when I transmit on SSB.  The KAT3 indicates a 1.0:1 match, 
but the when I transmit the swr meter is high and I get the high swr 
message on the screen.  If I turn it down to 5 watts and send a tone 
with Digipan, the swr is fine, but turn it up to 100 watts and the swr 
is back up.  Nothing obvious has changed, the antenna is 2:1 on my 
analyzer with no tuner.  If I bypass the antenna tuner, the bar graph 
meter on the K3 shows about 2:1.  But if I switch in the KAT3 and 
tune, it indicates 1.0:1 but when I transmit it's high.  I've swapped 
coax jumpers between the radio and the antenna with no difference.  
Thanks for any suggestions.

Rob
NV5E


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RE: [Elecraft] High SWR problem

[Rob May]

Don,
I think you're right, it is an antenna problem.  No problems on a dummy load at 
any power.  Well, it's up to the roof.  Thanks.
Rob
NV5E

 Date: Tue, 21 Oct 2008 14:19:03 -0400
 From: [EMAIL PROTECTED]
 To: [EMAIL PROTECTED]
 CC: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] High SWR problem
 
 Rob,
 
 You may have something in your antenna system that is arcing at high 
 power, but is working just fine at low power.
 
 73,
 Don W3FPR
 
 Rob May wrote:
  All has been fine with my K3 until today.  The display is indicating  
  High SWR when I transmit on SSB.  The KAT3 indicates a 1.0:1 match, 
  but the when I transmit the swr meter is high and I get the high swr 
  message on the screen.  If I turn it down to 5 watts and send a tone 
  with Digipan, the swr is fine, but turn it up to 100 watts and the swr 
  is back up.  Nothing obvious has changed, the antenna is 2:1 on my 
  analyzer with no tuner.  If I bypass the antenna tuner, the bar graph 
  meter on the K3 shows about 2:1.  But if I switch in the KAT3 and 
  tune, it indicates 1.0:1 but when I transmit it's high.  I've swapped 
  coax jumpers between the radio and the antenna with no difference.  
  Thanks for any suggestions.
  Rob
  NV5E
 

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[Elecraft] High swr-- what is acceptable?

[George]

My homebrew linear amp (single 3-500Z) does not have a tuned input feature, and 
the swr when using the kpa 100 to drive the linear amp runs around 3:1.  I get 
a hi reflect message if I run over 50 w out to the linear amp.  Is this swr too 
high??  If not, what is a safe maximum swr??  I understand that when hi reflect 
is displayed, the output from the kpa 100 is reduced and I can live with that 
-- I just don't want to damage the K2.  


Thanks and 73, N4YM
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[Elecraft] High SWR on 20 meters

[Bill Carpenter]

I've been enjoying my K2/100 a lot but was never happy with the SWR bridge 
alignment which I did per the manual.  I found a great procedure here on the 
list that uses Caddock power resistors from Mouser as 25 and 100 ohm dummy 
loads.  I got everything aligned and all seems fine except for high SWR on 
20 meters.  It's fine on my dummy load (1-1) but both my beam and vertical 
read at around 2-1 which cuts back my power.  Both these antennas are nearly 
flat at the frequency I used as measured on every other SWR meter I have and 
my MFJ analyzer.   I feel reasonably certain that my power calibration is OK 
though I don't have a Bird or equivalent so I used the power meter in my Ten 
Tec tuner.

Any ideas?  Why only on 20 meters?

Thanks!

Bill NZ0T 



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