On 07/03/2018 04:21 PM, w2bvh wrote:
> The MDS problem is now apparently fixed!
Great news Lenny! I got interested and spent the afternoon measuring my
K2. Once having the results, I had to send them! And wanted to test my
new test equipment.
The K2 is an amazing radio. I'm glad that the
On 07/02/2018 01:22 PM, w2bvh wrote:
> _XFil BW Hz) MDS (dBm)
> _400 -125
Measured K2; 14 MHz with 400 Hz BW using XG3 and Fluke 87V (True RMS
with averaging mode). With full AF gain, the two -107 dBm / off voltages
were 322.3 mV and 12.5 mV, =>
Hi Don & John,
Thanks for the advice. The MDS problem is now apparently fixed! Before
doing the signal tracing, I decided attend to a simple set of repairs on
the K2 which I've put off for awhile. I changed the Ext Spkr jack on the
back and the Headphones jack on the front (both of which
Lenny,
Check the obvious - is the Receive Antenna (RANT) on?
Is transmit power full output?
If both are correct, you will have to go through the Receive Signal
Tracing in the Troubleshooting Appendix of the manual.
If you have an oscilloscope with a 10X probe, you can use the HP8640B to
drive
Thanks Don,
As you say, I also would expect the signal from the 8640B to be clearly
audible at -140 dBm on the K2.
I took your advice checked the filter bandwidths. I used the old noise
source I built when I originally built the K2 ( Tom Hammond design?)
along with the filter measurement
Lenny,
Are your IF filters aligned so a 550Hz signal is within the passband.
With the K2, simply setting STP for 550 Hz will not do it, you must do
CAL FIL to make 550Hz appear well within the receive passband.
A properly tuned K2 will typically have a good response to a -140dBm
signal from
Hi Lenny,
In the past I've used the "Measuring Receiver Sensitivity" found in the
XG3 manual:
http://www.elecraft.com/manual/E740154%20XG3%20Owner%27s%20Manual.pdf
to be rather close to published K2 numbers.
John KN5L
__
Elecraft
I dragged my HP8640B out of the "lab" (basement) to the second floor
shack to do some antenna testing about a week ago. Before dragging this
50 lb instrument back down two flights of stairs I decided to do a quick
MDS measurement on my K2 and got some results I'm a little concerned about.
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