Re: SX-62 alignment instructions
开云体育Oh Jim, my ONLY intent of this was? about removing a tube or otherwise preventing an antenna input while at the same time? using the mixer tube as a buffer between the Sig generator and the first IF transformer.?? There are different methods all depending on the circuit and its accessible points. ?It is part of my response to his original question. ? From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Sunday, March 16, 2025 4:32 PM To: [email protected] Subject: Re: [HallicraftersRadios] SX-62 alignment instructions ? Don Your IF alignment instructions are missing an important caveat.? You must lower the SG output to below where the AVC begins to operate.? Not doing so will cause the IFTs to be misaligned.? With the volume and RF gain controls at maximum, the SG modulation should be heard but just barely over the background noise as the IF alignment progresses.?? ? Better to measure the voltage at the speaker terminals and not rely too much on one's hearing, especially as we get older, right Richard?.? This IF alignment method would be useable for all superhetrodyne receivers, not just hallicrafters. ? Might as well mention that if the radio has a crystal filter in the IF chain, the frequency that this crystal passes through the filter is used to align the IFTs, not the SG dial reading. Jim
-- don??? va3drl |
don Root