At 04:59 PM 9/29/2004, Don Ehrlich wrote...
>The signal at TP3 is about 2 volts peak-to-peak. Is this a normal
>value? It looks marginal to me for triggering the Q9/Q10 flip-flop.
>If so then the PLL Ref Oscillator has a problem.
Q9 & Q10 form an amp/buffer to the U9-15 input. U9-10 provides pow
Hello all,
Don Brown is right. I had the same problem, and it turned out Q9 was extremely
weak - even though the E B C voltages measured fine. The Scott at Elecraft
said to use a 2N in its place 'til the replacement parts arrived. I did
and it worked like a champ.
The guys at Elecraft a
- Original Message -
From: W3FPR - Don Wilhelm<mailto:[EMAIL PROTECTED]>
To: Don Ehrlich<mailto:[EMAIL PROTECTED]> ;
elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Sent: Thursday, September 30, 2004 7:21 AM
Subject: Re: [Elecraft] K2 Frequency C
Don,
I did not see an answer to your question on the reflector, so I pulled the
left side panel from my K2 and took some readings.
The peak to peak voltage at my TP3 is about 2 1/2 volts with the probe
attached and the K2 in CAL FCTR mode, so yours is within reason. This level
signal is amp
I am having trouble reading out the frequency of the signal at TP3,
the first step of checkout after part 2 of wiring up the RF board.
The Frequency Counter probe is fine and all components of the
frequency counter from the input through the flip-flop Q9/Q10 check
out perfectly with capacitance and
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