"Carel, PA0CMU" <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- Hi all,
From the estate of a friend, PA3BBT, I got a TR7 (serial no. 3157) and PS7.
All his amateur equipment was kept in boxes for nearly seven years and needed a serious cleaning. Two of my friends do have a TR7(serial no. 7???) and TR7A (serial no. 11178) too, so we can compare differences between the rigs.
Both TR7's produce a fairly loud "thumb" in the speaker when turning the mode switch to CW, regardless one switches from RTTY to CW or from LSB to CW mode. The same thumb appears when the AM mode is selected. The TR7A on the other hand, produces a smooth, thumbless switching between all modes. Despite all internet info we could not find any modification for this fault. Does anyone have some info on that? Is it a bug, or just "normal" for the TR7.
In my TR7 the first low pass filter (L1701 - L1702) is omitted, but in the other TR7 and TR7A all components are mounted. Does anyone know the values and toroid material of L1701 and L1702?
We also found out that there is missing a copper trace on the noise blanker PCB. The connection between pin 1 of the MC1350 and L812 is omitted on both available NB boards! One of the noise blankers didn't work (never did?) but was fine after placing about 5mm copper wire between both pads.
73, Carel - PA0CMU.
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