Posted by
Rajiv Dewan, N2RD on
Jul 24, 2006; 6:59pm
URL: http://elecraft.85.s1.nabble.com/QSK-revisited-tp392430.html
After my last email on comparing QSK implementations in the K2 and
the Yaesu FT-1000MP and the comments from knowledgeable people on
this forum, I decided to measure carefully and to make more careful
notes on what I heard.
I setup a K2 and an MP to transmit at the same frequency into dummy
loads. To test the K2, I transmitted continuously on the MP at a
level where the K2 showed a steady S9 signal. While this was being
received by the K2, I set up my keyer to transmit the letter v at
different speeds on the K2. I listened to the K2 and analyzed the
sound using Spectrogram. I then did the whole thing with the MP as
the device under test.
The details of the test, the results, and images of the Spectrogram
screenshots can be found at
http://rajiv.dewan.info/qsk/My subjective opinion is that the K2 is great if all one is
interested in is inter-character or inter-word reception. In fact,
the hang time is so well calibrated that it is very silent and easy
on the ears. This is especially important for long contests.
Inter-element reception is very demanding. For this purpose, I prefer
the Elecraft K2 while transmitting up to 20wpm. At 25wpm or greater,
the K2 essentially does not receive between elements. At 30 wpm
Yaesu still has a usable QSK implementation but the extra noise is
tiring. I do not think I could stand the noise from 30wpm or faster
for long during a long contest. Hang time can be increased (Menu
item 7-4 increased from 5 to 7 or 10ms) to where the QSK would be
essentially be useless between elements but would serve some purpose
to detect signals between words. With the increased hang time, where
inter-element QSK is essentially disabled, I prefer the K2 as the
Yaesu remains noisier. I will have to try even larger hang times and
compare the sound.
Hope you find this interesting,
Raj, N2RD
K2#5613
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Rajiv Dewan, N2RD
[hidden email]
FN13fc
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