Hey Guys,
Well, I am at the part where I need to test the 4 MHz oscillator calibration
and ran into a snag. I am not getting anything on two different frequency
counters when connected to TP3. Test up to this point have been good. Checked
all the components around X1 and all look correct. No
Any idea what the model designation is?
-Original Message-
From: Cameron Haines camhai...@yahoo.com
Sent: Jul 3, 2012 6:28 PM
To: elecraft@mailman.qth.net elecraft@mailman.qth.net
Subject: [Elecraft] Alignment and Test, Part II - No signal on TP3
Hey Guys,
Well, I am at the part where
Brian,
That is entirely normal. Which one of the 3 methods mentioned are you
using to calibrate the 4 MHz reference?
1) Measure the TP3 frequency with an accurate external counter - adjust
C22 until the K2 display matches the external counter.
2) Listen to the 4 MHz signal with another
-
From: Don Wilhelm w3...@embarqmail.com
To: Brian Denley b.den...@comcast.net
Cc: Elecraft Reflector elecraft@mailman.qth.net
Sent: Sunday, August 01, 2010 9:37 AM
Subject: Re: [Elecraft] Alignment and Test Part II
Brian,
That is entirely normal. Which one of the 3 methods mentioned are you
Brian,
Yes, a 10X probe on the counter may be necessary to prevent loading -
that depends on the counter and its input impedance..
If you know your counter is accurate, that will got things right on
frequency, but if you have doubts about the accuracy of your counter,
use the N6KR method which
While doing the 4 MHz Oscillator calibration, CAL FCTR shows 12100.10 which
seem nominal. But adjusting C22 doesn't allow me to change it very much at
all, maybe a few hundred Hz. It this normal?
Thanks for any help.
Brian Denley
http://home.comcast.net/~b.denley/index.html
Hi,
thank's for all the good pieces of advice. Unfortunately up to now
without success...
I accomplished the following steps:
- checking all parts of correctness and correct value: - ok
- checking each solder point: - ok
- checking solder points of T5 and the thermistor board with an DMM -
Hello Jim,
yes i have a O'scope.
I mesured the following Signals:
U4 Pin 4: 1.2Vpp sine form
U3 Pin 3: 0.8Vpp sine form
U3 Pin 6: 1.6Vpp sine form
is this ok?
73 de Peter
k4zm schrieb:
Peter:
Do you have an O'scope? It appears that you have no input to Pin 4 if
U4 which is the
Hi Peter,
The significant voltage could be the PLL chip PDOUT, U4 pin13. Check for
shorts on this pin that would give a zero reading. Not sure if the PLL chip
itself would support such a low voltage whilst working normally. Have seen
reported of odd effects with RFC15 the DC feed to the
Peter,
A probable cause is a soldering problem on the thermistor board. Examine it
VERY closely, and if nesessary, remove it and re-do all the soldering.
Remember that this little board does not have thru plated holes, so
soldering on this board is more critical that for the rest of the K2.
Well we are moving right along. Just got to the Second aliignment and test
section na dthe 4 mhz osc calibration went fine. The PLL reference range
test looked good and the range was right in the middle of the road. But when
I plugged the freq probe in TP1 and did a cal factor to check the VCO is
7:42 PM
Subject: [Elecraft] Alignment and test part II
Well we are moving right along. Just got to the Second aliignment and test
section na dthe 4 mhz osc calibration went fine. The PLL reference range
test looked good and the range was right in the middle of the road. But when
I
Rich,
Be certain the frequency counter probe is still working by plugging it into
TP3 again, then --
Check T5 to be certain you have well tinned leads and good solder joints.
Then check the orientation of D13. Check soldering on all components shown
in the schematic VFO section (RF board sheet
13 matches
Mail list logo
