03-31-2016, 10:02 PM
Yes, it is not unusual to hear a SW station in two places on the dial with this set. The 118 uses an IF of only 260 kHz, so you will hear the image freq of a received station 520 kHz away. This is not much of a problem on the BC band, but at higher SW freqs the problem becomes more evident.
The 118 was really designed as a modification of the earlier BC only model 18, and making it receive SW was an afterthought. Later SW radios used a 465 kHz IF which improved the image rejection, putting the second signal 930 kHz away where it could be attenuated better by the Ant and RF tuned circuits.
There is no way to trim the RF amp plate circuit on SW, so you really have to compromise the osc freq a bit so it tracks. I basically went back and forth between the SW osc and ant trimmers to get the best sensitivity, but I favored the high end of the band because that's where most of the listenable signals are.
The 118 receives SW pretty well, but don't expect the performance of later sets specifically designed as all band radios.
The 118 was really designed as a modification of the earlier BC only model 18, and making it receive SW was an afterthought. Later SW radios used a 465 kHz IF which improved the image rejection, putting the second signal 930 kHz away where it could be attenuated better by the Ant and RF tuned circuits.
There is no way to trim the RF amp plate circuit on SW, so you really have to compromise the osc freq a bit so it tracks. I basically went back and forth between the SW osc and ant trimmers to get the best sensitivity, but I favored the high end of the band because that's where most of the listenable signals are.
The 118 receives SW pretty well, but don't expect the performance of later sets specifically designed as all band radios.
