[R-390] R 392 T-602 bfo

Mon, 28 Oct 2002 15:10:00 -0800

There is no strong reason for it to be different
from the R-390*, in which it's a single winding
with a tap near one end.  The end nearest the tap
is ground, the far end is the grid and resonating cap,
and the tap is the cathode.  If I'm remembering right,
that's a standard Hartley oscillator circuit.

73,
Dave Wise

> -----Original Message-----
> From: Dan Merz [mailto:[email protected]]
> Sent: Monday, October 28, 2002 9:59 AM
> To: [email protected]; R-390 List
> Subject: Re: [R-390] R 392 T-602 bfo
>=20
>=20
> Hi guys,  with no answer,  I guess I'll take the next=20
> shortest route to my
> question and hook it up - if it doesn't work,  I'll reverse=20
> the two leads in
> question to get the phase correct.  At least I don't have to try 6
> permutations,  hi.  Dan.
>=20
> Dan Merz wrote:
>=20
> > Hi,  I am puzzling over the three connections to the bfo=20
> unit out of an
> > R-392 receiver,  T-602  type 70J-2.  Looking at the=20
> connections end on,
> > the one first one starting at 9 oclock is the the number 1=20
> connection
> > going to the grid capacitor and the bfo pitch capacitor, =20
> but then I'm
> > not sure about the other two that are adjacent going=20
> clockwise.  I think
> > the next one is the cathode connection (called number 3 in=20
> the schematic
> > I have) and the most clockwise one is the ground connection (called
> > number 2) in the schematic I have.  The schematic is from
> > TM5820-334-35-13,  which is the only documentation I have=20
> in hand.  I've
> > looked at the pictorals in this manual but can't convince=20
> myself about
> > this conclusion from the appearance of the wiring because=20
> details aren't
> > that good.  I did some resistance measurements but without=20
> knowing how
> > the lower leg is wound (continuous with tap vs. additional=20
> coil wound on
> > top of first) I don't really know how to interpret the measurements.
> > Does anyone know the answer?  thanks,  Dan.
> >
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>=20
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>=20