[ARC5] BC-348Q CW Oscillator Question

[Mark K3MSB]

Robert

Thank you for your comments.  I agree if measuring resistance through the
wiper.   However, measuring the resistance form the end of the 80K resistor
should give you the sum of the 80K resistor and the Volume Pot.   At max
volume the pot should be 0 (ideally), so the total resistance should be
80K.   But, it's not and I'm still not sure why.

Mark K3MSB



On Sun, Jan 17, 2016 at 1:03 AM, WA5CAB--- via ARC5 <arc5 at mailman.qth.net>
wrote:

> Mark,
>
> The table calls for rotating the Volume/Sensitivity knob fully CW.  The
> fully CW ends of the two pots are at the bottom, not the top.  With the 20K
> pot fully CW, the wiper is at the grounded end.  So the 80K resistor has no
> effect.
>
> In a message dated 01/16/2016 18:57:08 PM Central Standard Time,
> mark.k3msb at gmail.com writes:
>
> My Question.  Resistor 94-2 is the 80K resistor connected to the
> ungrounded terminal of the volume pot.  With this in the circuit, a great
> many of the values in the table should be much higher.  My measured values
> agree with all the table values.   How can that be?  The 80K resistor is in
> series with the volume pot!  80K Isn't insignificant in this context....
> It's easy to isolate this resistor;  it's there and it measures near 80K.
>
>
> 73 Mark K3MSb
>
>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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