[HBR] Need advise: BFO coil not tapped

[hugo at optonline.net]

Cal,

Try a colpitts type oscillator  instead the hartley, (see any handbook for values and interpolate if needed).
The inductance value needed will be about one half the if's.

73,
Hugo - AA1XV
 
------Original Message------
From: C Eus
To: hbr at mailman.qth.net
ReplyTo: HBR Receiver List
Subject: [HBR] Need advise: BFO coil not tapped
Sent: May 17, 2010 12:20 PM

All:
I have a Miller adjustable coil, 12-25 mH, that doesn't have a tap.  I would
like to use the BFO circuit shown in the HBR schematic (take your
pick...they all seem to have that same tapped coil configuration).  Is there
any way I can formulate something equivalent without having to resort to
removing windings and adding a tap? I think a capacitor voltage divider
might be in order but that also induces a few unknowns.  Any help would be
appreciated. Cal, n6KYR/4
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