Re: SX-62 alignment instructions
开云体育
Forgot to mention SX-62B
From: [email protected] <[email protected]> on behalf of Jim Whartenby via groups.io <old_radio@...>
Sent: Sunday, March 16, 2025 4:31 PM To: [email protected] <[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
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Sunday, March 16, 2025 at 01:53:14 PM CDT, don Root <drootofallevil@...> wrote:
Scott, as an aside, this is what they say for the S-20R .. they use the converter but disconnect it from upstream.
From: [email protected] [mailto:[email protected]]
On Behalf Of Scott Petersen via groups.io ? Thanks!, I didn't look up which pin did what, I thought it could have been the plate, and pulling the tube would isolate the RF coming in. SX-62B
From: [email protected] <[email protected]> on behalf of don Root <drootofallevil@...> ? Scott, It is a SX-62 {no suffix} ? Since the signal is injected on the grid, it would seem the tube would have to be in service. ?? ?
-- don??? va3drl |