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revsch

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00readme

These files are the updated schematic and parts list for the Hallicrafters SX-117 receiver.  I rooted through the equipment archives at the Hamilton Wireless
Association's clubhouse, and lo and behold, found an updated schematic that
represents the wiring in this receiver.  To quote:

"Prior to production but after the Handbook was printed, certain wiring and
component changes were made in the Model SX-117 Receiver to improve its
performance.

These changes are contained in the schematic diagram and parts list herein
enclosed.  Please discard the schematic diagrams and parts list contained in
the Handbook and refer to those contained within this sheet whenever
necessary."

I have only made a cursory review of the two schematics, but changes
identified so far are:

1.  Change 1st mixer to a triode configuration.
2.  AVC detector bias 1 Meg R63 changed to 6.8 Meg
3.  AVC Time constant adjusted in C107 changed from 0.47 to 0.22 Mfd.
4.  Grid of AVC amplifier V10A was connected to V9, 6BA6, is now connected
to the IF transformer following 3rd mixer V8A, 6EA8.  Coupling capacitor C75
0.001 is now C65 100pf.  The old C65 was removed.
5.  Selectivity resistors R85 and R87 were changed from 470 ohms to 390
ohms.
73 de Bill, AB6MTbillsmith@ispwest.com

sx117doc

The enclosed files are the updated schematic for the Hallicrafters SX-117 receiver.  This information was requested by several stations on the Hallicrafters e-mail reflector supported by qth.net.73 de Bill, AB6MTbillsmith@ispwest.com

Files

sx117.djvu DJVU · 96 KB

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