Peter,
After a K1 Reset, nothing needs to be adjusted, but you will have to do
the menu related settings:
STP, STL, b1 and b2 settings (b3 and b4 if a 4 band board) and CAL OPF.
CAL OPF is not difficult, but does require a signal of known frequency
on each band - it is just an adjustment of
Petr,
After the reset, you should not have to do VFO calibration, but you will
need to set the VFO Offset (CAL OPF) in the menu. That requires only a
known frequency signal for each band that is installed and button taps.
73,
Don W3FPR
On 5/13/2019 11:45 AM, Petr, OK1RP/M0SIS wrote:
Hi
Hi Don,
perfect. many thanks for few hints.
i will do it step by step.
At first I will check physicaly the parts and soldering around the Q5.
Then after I will try to measure the POWER voltage line (R10) for its
stability.
If needed i can replace both the Q5 and D18.
the only I am worrying a
Petr,
Check the VPOWER signal line to see if there is any DC level change.
If is is a steady DC level, then try changing QW5 and/or D18.
If VPOWER varies, then the MCU or DAC is causing the variation. In that
case, I would try a Master Reset (See manual Reset to Factory defaults),
but first
Hi Don,
many thanks for kind help and reply.
Unfortunately I don't think its DAC sampling issue...
I checked it happends on any power level (not depending to the power level
setting)
and it happends in my case only on 40m (band 1).
Also I realized that the power variation is sometime 0.5W and
Petr,
There may be nothing wrong. The POWER control line originates at the U2
DAC on the front panel and is applied to Q5 on the RF Board.
You should check all components associated with Q5 to be certain of the
value and good soldering.
Since the POWER signal line is derived digitally from
Hi Bert,
Even I noticed that power jumps sometimes also down... not only up as shown
on vid. It happends on band 1 - 40m in my case, band 2 - 20m seems ok.
regards,
-
73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
MeWe: https://bit.ly/2HGPoDx
MeWe:
Hi Petr,
I've checked you video and interestingly enough I have the same or
similar problem with my K1.
Sometimes the power output goes to the full programmed output and pulls
back 1 watt or so. It doesn't
happen every time I transmit but quite often and I can't figure what's
wrong.
Hi all,
so all TX part alignment went ok. All resistances, voltages and finaly power
re-peaking is in spec.
Also 5W test seemed ok until I noticed strange behavior > the power
fluctuation on key down as same
as after band switching...
Short vid is here:
https://youtu.be/lpf8GT09wv8
I am
Hi all,
another work in lab on son’s K1 done. On KFL1-2 the K2,K3 relays replaced,
L11,L12 reworked for correct 15t on cores (0.8uH)... Now its waiting for
band module resistance re-check and re-tweaking TX part this evening. I
wonder if it will be finished successfuly...
-
73 - Petr,
Hi all,
so another evening spent with K1...
As Don suggested we stepped back and revised the band module for correct
winding and resistance check. I found that all LPF cores are not correct.
L9-L10 with 22t instead of 21t and L11-L12 with 14t instead of 15t for
40/20m band. So I am going to
Hi Don,
yes filter board is not inserted during these tests on page
45-46...(resistance and voltage tests)
Thanks for hints,
Petr
-
73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
MeWe: https://bit.ly/2HGPoDx
MeWe: https://bit.ly/2FmwvDt
--
Sent from:
Don and Bert,
Thanks for inputs from both.
All measurement was done without the filter board.
Petr
-
73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
MeWe: https://bit.ly/2HGPoDx
MeWe: https://bit.ly/2FmwvDt
--
Sent from: http://elecraft.365791.n2.nabble.com/
Bert,
Multiply the RF Voltages listed for the RF Probe by 2.8 to get the peak
to peak RF voltages observed with an oscilloscope.
73,
Don W3FPR
On 4/21/2019 9:13 PM, Bert wrote:
HI Don and Petr,
Thanks for the offer Petr but Don has already been kind enough to send
me the Rev. D, 2000 K1
Don and Petr,
Forgot to mention that measurement was done with filter board plugged
in. 5.7K
Bert VE3NR
On 4/21/2019 6:26 PM, Don Wilhelm wrote:
Petr,
Do you have the filter board plugged in when you read 5.6k ohms?
Note in the Revision D manual, the filter board is NOT plugged in when
HI Don and Petr,
Thanks for the offer Petr but Don has already been kind enough to send
me the Rev. D, 2000 K1 Manual. Thanks anyway!
I find it quite difficult sometimes to troubleshoot and follow the
schematics. Also doing signal tracing in the receiver and
transmitter is quite subjective
Petr,
Do you have the filter board plugged in when you read 5.6k ohms?
Note in the Revision D manual, the filter board is NOT plugged in when
making the resistance measurements on page 45.
The filter board is not plugged in until you get to page 46.
73,
Don W3FPR
On 4/21/2019 5:57 PM,
Hi Don and Bert,
as I noticed this evening > troubleshooting nor alignment parts are not same
in the different Rev. of K1 manuals.
Our sick K1 is also from 2000... RF board Rev. D, 2000 so I am using the
manual Revision D, Dec 1, 2000.
Unfortunately when I measured the resistances on page 45
Bert,
The troubleshooting section is about the same - no problem.
Do not rely on the board Rev level to be the same as the manual level.
There is no Rev J K1 board.
73,
Don W3FPR
On 4/16/2019 9:03 PM, Bert wrote:
Hi Don, Petr and all,
I have a similar TX problem that I've been working on
Hi Don, Petr and all,
I have a similar TX problem that I've been working on for a time.
Reading your emails I realized
that I'm using a K1 manual Rev. J. 2015.
My K1 is from around 2000, Rev. D, and I'm now asking if the Rev. J of
the manual is OK to use
as reference and for
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