"Ted" wrote in message
...
Dale & Don,
I haven't had a chance to lash up the components yet, but I checked my
spreadsheet using Wes's example on page 4.4. The numbers check out;
unfortunately, Wes specifies a value for C3 in the EMRFD example, and
in the Progressive Receiver Article, C3 is the unknown; i.e., how much
additional capacitance you'd have to add in parallel with the coil to
use a specific variable cap in the given configuration.
Now that I can see the "C12v" equation in EMRFD, which is not in the
QST article, but I've modified my spreadsheet to include it I can
check the resonance using the given values for L.

Dale, when I looked at your jpg's again yesterday, I noticed that
you've modified the receiver internals a lot since I first saw the
rig. Since the links I had were to a directory on your commercial
site, I'm not sure if you have another site where you described what
you did.

Early last Spring, I got rid of all my new-fangled ham rigs, like the
FT-817 and the not-so-new, but pristine TS-530s and bought an HW-101
and some equipment to restore. Homebrewing and boatanchors is what
I'm about now. I did the VFO alignment on the HW-101 and was able to
get it within 1kHz, end to end, as indicated on the dial, anyway. That
surprised the heck out of me. I've since acquired an LMO from an
SB-401 that I'm going to put in a project somewhere along the line. I
have a complete set of Heath HFO crystals, and both CW and SSB filters
from another source. I might make myself a broadbanded QRP rig out of
those.

73,
Ted KX4OM

Hi Ted,
I quickly looked at the VFO schematic in my1994 Handbook that had the PR. I
seem to recall in the end I replaced C1 with a short- just eliminating it.
Not 100% positive, but think that was what it came down to in order to get
good linearity out of my VFO.

Dale