Bob -
As I said, 40 years is a Loooong time. Stupid synapses........... :-)
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>
Bob Loving wrote:
Steve, I think Garey meant that the 2nd IF filters in the R-4C, like the filters in the TR-7, are
all designed for 50-Ohm terminations. That makes them quite easy to test outside of the receiver
or transceiver (or test the antenna to filter input or the filter output to speaker paths). The
8-kHz wide roofing filter and any of the Sherwood or Inrad substitute roofing filters are designed
for the 1-kilohm terminations mentioned by Garey. Any substitute 2nd IF filters are 50-Ohm designs.
Bob K9JU
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