[Premium-Rx] Eddystone 880/2 information needed

[Brooke Clarke]

Hi John:

I don't know anything about this specific radio.  It may be that the oscillator frequency gets pulled more the tighter 
the coupling.  So, over time there may be different coupling methods.  Some official and some done in the field.  It may 
be that the wire around the tube works well.  YMMV.

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> Hello,
>
> Is there anyone with an Eddystone 880/2 High Stability Receiver who can confirm how the calibrator circuit output is supposed to be connected?
>
> The three versions of the manual that I've found online all give two contradictory descriptions:
> 1) the text states that the calibration signal is connected via a 3pF coupling capacitor to the anode of V1B
> 3) the annotation of the circuit diagram shows the calibration signal going to an "injection probe to anode of V2" (what exactly is this "injection probe"?).
>
> My newly-acquired receiver does not correspond to either of those; instead, the calibration signal has been coupled to V3 with a wire wound round the valve (This does not look original!)
>
> I'd like to know how the calibration signal is connected in real, unmodified, receivers.
>
> thanks,
>
> John Graham
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