HW-101 Still has Low Output

[Will, Mark]

Several folks had suggestions as to how to cure the Low-Output on my
HW-101.  So at the suggestion of many, I attempted to tighten all circuit
board screws and re-align the unit again.  Alas, I still have no better
results.  However, I have found some clues as to where the problem might
be.  If I remove the cover from the heterodyne, driver, and grid coils, the
output jumps to 100 watts on all bands.  The area most affected by the
coil cover seems to be near the steel switch shield between the
driver-grid and driver-plate switch boards.  I can short the rails together
at
each side of the switch boards and shields.  When I get near the shield
between the driver-grid and driver-plate board, the output power goes
from 100 watts to near 10 watts or so. I am fairly confident that the
cover is not shorting anything on the circuit boards.  I have tried removing
the the spring clips on the coil cover as per Heath Service Bulletin
HW-101-4.  And, I have tried replacing the aluminum comb brackets with
steel brackets and soldering the boards and shields to these brackets per
Heath Service Bulletin HW-101-8 and HW-101-9.  Now I can only get
about 15 watts out on every band except 15 meters which has about
90 watts out.

Why would I have so much RF running around on these steel switch
shields??  Is steel maybe not such a good material for these shields??
Should I suspect some bad connection between the chassis causing
ground loops??

Mark

Mark C. Will
E-mail: mark.will at lsil.com
LSI Logic Storage Systems, Inc
3718 N. Rock Road
Wichita, Kansas 67226-1397
Phone:  (316) 636-8088
FAX:    (316) 636-8889

Sponsored by the City of Tempe 

Listserver Submissions:  heath at listserv.tempe.gov
Listserver Subscription: listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'"
Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"