[Hallicrafters] SR-150 selectivity and SR-2000 audio quality

[Jim Liles]

The SR-150 and the SR-2000 use a 2.7 kHz and 2.1 kHZ filter respectively.  A common complaint for the SR-150 is that it is too wide for contest operations and the SR-2000 can sound pinched or tinny.  These filters 049-000216 and 049-000324 can be exchanged along with the carrier crystals.  The carrier crystals for the SR-2000 are 1648550 and 1651550 kHz and the SR-150 1648100 and 1651700 kHZ respectively.  I have tried the SR-150 filter in the SR-2000 and it works perfectly.  The warp cap that brings the USB crystal 90 Hz down into the filter window for tune and CW works flawlessly also.  What you get is great sounding audio, transmit and receive, and a radio (2.7 kHZ) that would be a little wide for contest use.  If you are an SR-150 owner who likes to contest and is willing to give a little audio quality for a skinny filter, it's a good solution.  Regards Jim K9AXN