Paul -
Because of the mixing scheme used in the TR-4 the filters are not
designated as "USB" or "LSB". This is also the reason for the lights
indicating USB / LSB. You'll notice if you select LSB on 80 M,
according to the lights, and then switch to 20M the USB light will come
on without moving the SIDEBAND switch.
Have you thoroughly checked and DeoxIT'd the switch?? Check for broken
wires too. Filters DO fail, but usually not 'totally' dead. They'll
lose a crystal or two and get a too narrow passband, or develop a notch
in the center of the passband.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Paul Gerhardt wrote:
Does anyone have a Non X Sideband filter for a TR-4 I have the later
'Blue' filters rather than the single can filter.
Also is this really an USB filter? For example the filter works on
40M LSB ok but NOT on 20M USB.
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