Greetings, all.
For some time I've suspected my K2 of being partially deaf (ie. not as
sensitive as it should be). I bought an XG3 a while ago and finally sat down
to check my K2.
I set up the K2 following the XG3 manual. Volume control set to was slightly
before 12 o'clock so I had maximum volume possible before there was audible
distortion heard in the speaker, I used a 400Hz filter as I don't have a
500Hz one set up, and I removed the KAT2. I took measurements at the speaker
terminals with the speaker disconnect as the volume was quite loud with the
speaker connected. On 40m, S+N was 532mV and N was 19.2mV for a receive
sensitivity of -135.7dBm (approximately).
I installed the KAT2, tuned in to a dummy load on ANT1 that measured 51ohms
on an ohmmeter, and set the KAT2 to calS mode. I ran the test again without
changing any controls from the first test. The speaker volume was only 55mV,
about 1/10th what it was without the KAT2. Calculated senstivity was around
-128dBm.
Sensitivity seems a bit lower with the KAT2. Perhaps I should have upped the
volume setting but I thought I should try and do a more direct comparison to
the bare K2.
Center conductor of ANT1 to KAT2 output is only 1 ohm so there is nothing
obviously wrong at DC levels. I don't like the 10 fold drop in speaker
volume with the KAT2 installed with all other things being equal. Is this
considered "normal" or is this an indication of a problem in my KAT2? Any
thoughts what to look for if this 10 fold drop in output is not normal?
--
Cheers!
Kevin.
http://www.ve3syb.ca/ |"Nerds make the shiny things that distract
Owner of Elecraft K2 #2172 | the mouth-breathers, and that's why we're
| powerful!"
#include <disclaimer/favourite> | --Chris Hardwick
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