[ARC5] BC-348Q CW Oscillator Question

[Mark K3MSB]

Good Morning All --

Yes, the dynamotor is installed, but that should not effect this particular
circuit.

I restored the dynamotor a few years ago and had the radio on the air a few
times;  it worked.   I'm not sure why I put the radio aside then, but from
previous work I knew it needed the filament dropping resistors replaced
(confirmed that again last night), I was having an issue with the AVC, and
some of the voltages were uncomfortably off.    I didn't bother to run it
when I restarted work a few days ago.

73 Mark K3MSB


On Tue, Jan 12, 2016 at 11:33 PM, WA5CAB--- via ARC5 <arc5 at mailman.qth.net>
wrote:

> I agree that the Switch-Off reading should be quite high.
> The chart doesn't actually say, but did you take your Switch-On reading
> with a dynamotor connected or disconnected?
>
> In a message dated 01/12/2016 20:29:24 PM Central Standard Time,
> arc5 at mailman.qth.net writes:
>
> If that's what the circuit DC path shows, and the CW osc works,I wouldn't
> worry about it. Probably is a typo.
>
> I was never fond of wholesale resistance measurements as a troubleshooting
> tool anyway. Are you just poking around or is there an issue with it?
>
> On Tuesday, January 12, 2016 6:50 PM, Mark K3MSB <mark.k3msb at gmail.com>
> wrote:
>
>
> Gentlemen:
>
> I'm restoring my BC-348Q receiver.   The resistance measurements I get for
> the Plate (Pin 6) of the 2nd Det / CW Oscillator tube (V233) are way off.
>
> Table D from AN-08-10-112:
>
> CW OSC OFF:  500K
> CW OSC ON:   5M.
>
> My measurements:
>
> CW OSC OFF:  Infinite
> CW OSC ON:   600K
>
> From sketching out the DC circuit path from V233 Pin 6, I come up with :
>
> CW OSC OFF:  Infinite
> CW OSC ON:   567K
>
> I'm wondering if the manual has the values flipped?
>
> 73 Mark K3MSB
>
>
>
>
>
>
>
>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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