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Hi Tokio,<br>
<br>
I'm measuring at the circuit, the signal coming from the internal
10MHz is a nice square wave,<br>
but when put on the external 10MHz (+13dBm 1V-tt @50Ohm sinus wave)
it's not a nice square wave coming out<br>
from the 2 stage buffer, just some top flatting at one site.<br>
When I lowering the external 10MHz with an 20dB attenuator, this
change to a 2V tt sinus wave and no locking at all.<br>
So this could means that, a) I need bigger signal from my external
10MHz or <br>
b) I can try to modify some
more this 2 stage buffer for better square-wave.<br>
Yes, when using the external 10Mhz the internal osc is switched off
completely, by removing the psu jumper and output from the osc.<br>
<br>
Thanks<br>
<br>
Bert
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<div>Hi Bert,</div>
<div><br>
</div>
<div>I had the same problem with an external clock 10MHz a couple
of months ago.</div>
<div>With the help of Phil, VK6APH, I changed the value of the
famous R141 to 50 ohm. It cleared the problem for my case.
Please make sure that the internal clock is stopped by the
jumper and look at the the clock wave just after the wave
conversion circuit by oscilloscope. I hope it will help you.<br>
<br>
Tokio</div>
<div>JA1CCA</div>
<div><br>
2013/05/18 16:58、"H.A.Meijer" <<a moz-do-not-send="true"
href="mailto:meijer.ha@home.nl">meijer.ha@home.nl</a>>
のメッセージ:<br>
<br>
</div>
<br>
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