Don and all who helped
Diodes have been replaced. Everything is back to normal
Thanks
Ariel NY4G
Sent from my iPad
On Oct 31, 2012, at 11:02 PM, Don Wilhelm w3...@embarqmail.com wrote:
Ariel.
While it is sometimes possible to clip the leads on the top of the board and
use the
Don,
I took off the shield on the KPA100 and those two diodes are tight against the
back panel and the toroid. What would you recommend is the best way to
desolder and replace those? It is tight against the back panel and a toroid.
I do not want to risk damaging the nearby toroid - so I
Ariel.
While it is sometimes possible to clip the leads on the top of the board
and use the remaining leads to mount new diodes, I suggest that is
cheating. I always remove the board from the heatsink and de-solder
the diodes from below.
Usually, the thermal pads will stay in place and can be
Of Ariel Jacala
Sent: Wednesday, October 31, 2012 7:35 PM
To: d...@w3fpr.com
Cc: elecraft reflector
Subject: Re: [Elecraft] K2: High SWR On Dummy Load
Don,
I took off the shield on the KPA100 and those two diodes are tight against
the back panel and the toroid. What would you recommend is the best way
...@mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Wednesday, October 31, 2012 8:03 PM
To: Ariel Jacala
Cc: elecraft reflector
Subject: Re: [Elecraft] K2: High SWR On Dummy Load
Ariel.
While it is sometimes possible to clip the leads on the top of the board and
use the remaining leads to mount new diodes, I
Ariel,
You may indeed have a problem with D9 and the 3 associated resistors in
the base K2, BUT when the KAT2 or the KPA100 is installed, that circuit
is ignored.
Both the KAT2 and the KPA100 contain a true wattmeter that is positioned
right at the output and used for power control.
The K2
...@hotmail.com
CC: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2: High SWR On Dummy Load
Ariel,
You may indeed have a problem with D9 and the 3 associated resistors in
the base K2, BUT when the KAT2 or the KPA100 is installed, that circuit
is ignored.
Both the KAT2 and the KPA100
Ariel,
I would think your K2 finals are OK (for now).
My best guess is that you have a KPA100 and a static charge has damaged
diodes D16 and D17 in the KPA100. If you do not have the KPA100, then
you most likely have the KAT2 and the diodes are D1 and D2 - the same
principle applies.
To test
Thanks to Jim, Vic and Don for the return comments
I disconnected the KPA100 and put on the K2 top with the KAT2 ATU. With the K2
ATU connected and the dummy load connected - the SWR correctly reads 1:1 with
menu set for CALS. With the menu set to CALP, the power levels appeared to
modulate
Ariel,
Do not be too quick to conclude that there is something wrong with the
base K2. The basic K2 uses only an RF voltage diode to display the
power output, and it may not be exact - it depends on the load and may
vary from band to band - if it only off by a watt or two, then all is OK
Don
The K2 with the ATU behaves as expected - internal meter agrees well with the
external meter, current draw is as expected, and so forth for various power
levels up to 10watts checked out. It was connected to a dummy load.
Without the ATU and the dummy load connected to the base K2
My. K2/100 is acting up in that it is showing high SWR even on a dummy load.
Any ideas on whether the K2 finals may be blown? It behaves the same way on all
the bands. It displays high current with the power set to 3 watts or more. My
K2 is SN7105.
Will appreciate diagnostic help.
Ariel
Ariel -
What options, if any, are in your K2? Can you temporarily disable the
100-watt PA and connect the 10-watt PA directly to the dummy load
(disconnecting the cables to the KPA-100 completely), and if so, what
happens then? It may be that the wattmeter diodes are damaged. If that
You probably have thought of this, but make sure you are using a different
cable to the
dummy load than the one you were using with the antenna. Bad cables, or rather,
bad
cable-connector junctions, are very common.
On 10/24/2012 7:18 PM, Ariel Jacala wrote:
My. K2/100 is acting up in that
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