[Elecraft] Checking K3S receive sensitivity
Tom Norris
tknorris0001 at gmail.com
Mon Dec 25 00:11:30 EST 2017
I have completed the K3S kit assembly but had questions about the receive
sensitivity. On the advice of Gary, AB7MY at Elecraft Support (Thank you) I
have went through the filter configuration again via the K3 Utility and
improved things to the point that I now hear AM broadcast stations but few
hams down in the mud (band condx? and poor single #14 insulated long wire
antenna 6' in air-my son is to help me get OCFDP up when we can (have 6
element tri-band yagi that needs rebuilt on saw horses :-)). The only
signal generator I have is an antenna analyzer with a -10dbm output. After
some research to use the analyzer to supply a low level signal to the K3S I
have come up with these values for a Pi attenuator circuit and would like
to have someone check my results and give advice:
-10dbm analyzer fixed output or 71 millivolt rms attenuated to 50
microvolts rms would be, I believe, a 63db attenuation. For a Pi attenuator
the resistor values would be two R1=50 ohm resistors (signal to gnd), for
the one R2=35.3 kohm resistor (in series with the signal between the two R2
resistors). Probably just use two 47 ohm and one 33 kohm. I don't intend to
do ANY calibrations with this device, just a way to see how the K3S is
functioning and that my thinking is in the ball park.
Thank you and 73,
Tom NB5Q
More information about the Elecraft
mailing list