[Elecraft] [K3] Subtle Change in CW monitor tone

[WILLIS COOKE]

I have never noticed anything similar to that Phil, but I am from the pre-phase-lock-loop era when every signal had some chirp and many signals had a lot of chirp.  Now when chirp is rare, I get nostalgic when I hear an old tube rig with some.  I suspect that the source of what you hear may be the drop in supply voltage between key up and key down of the transmitting station.  All transceivers have some but only a few, like the K3 allow you to monitor it.  My K3 drops from 13.8 to 13.2 Volts.  I can not see a drop at the power supply, but there is 6 feet of #10 wire X 2 plus the power connector, the wire connection to the power connector, the stake on rings at the power supply, the connectors to the circuit breaker, the circuit breaker itself none of which have zero resistance. With 20 amps or more current. there is a bit of drop, even with a very stiff power supply.  All rigs have a similar or worse voltage drop situation.  That is my theory and
 I am sticking to it!
 Willis 'Cookie' Cooke 
K5EWJ 




________________________________
From: Phil Hystad <k7peh.wa at gmail.com>
To: elecraft at mailman.qth.net
Sent: Thu, March 11, 2010 12:44:23 PM
Subject: [Elecraft] [K3] Subtle Change in CW monitor tone

I am not sure how to describe this but I will do the best I can.  When
listening to a single CW station I detect a slight tone frequency change
from the sending station.  It almost sounds like some other very close by
(within 100 Hz) station is also sending but such another station does not
exist.  I thought at first it might be a slight variation due to the
sender's frequency control but I have ruled that out as it occurs with a
number of different stations.  I can hear this mostly (or, maybe only) when
the signals are strong, S9 and beyond.

Does anyone else detect this or is it just me.  It is not really a bother
now that I am used to it but it seems to occur only when there is a slight
pause in the sending, such as break between words.

Comments?

73, phil, K7PEH
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