SX-62 alignment instructions
开云体育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. ?? ? From: [email protected] [mailto:[email protected]] On Behalf Of Scott Petersen via groups.io
Sent: Friday, March 14, 2025 6:57 PM To: [email protected] Subject: [HallicraftersRadios] SX-62 alignment instructions ? Hi Guys, In the instructions it says to connect a .1mfd capacitor to pin 1 of the 7F8, do I leave the tube in circuit, or put the lead directly in the socket? Should I remove the chassis side cover, or will it make a difference to the alignment, same with the RF shield under the IF's? Thanks, Scott _._,_._,_ -- don??? va3drl |
开云体育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
Sent: Saturday, March 15, 2025 2:48 PM To: [email protected] Subject: Re: [HallicraftersRadios] SX-62 alignment instructions ? 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 |
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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
Sent: Saturday, March 15, 2025 2:48 PM To: [email protected] Subject: Re: [HallicraftersRadios] SX-62 alignment instructions ? 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 |
开云体育
Thanks, I tried(the correct way), but I'm having issues with the FM, it has so much gain in FM that the oscillator stops, until I reduce the RF gain, I have to align it on 2-3? on the RF gain to get anything out of it. going to start over and try again.
From:[email protected] <[email protected]> on behalf of don Root <drootofallevil@...>
Sent:?Sunday, March 16, 2025 2:53 PM To:[email protected] <[email protected]> Subject:?Re: [HallicraftersRadios] SX-62 alignment instructions ?
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 |
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 |
开云体育Scott, you did not yet say, is it a SX-62 A, or B or no-suffix? It seems that you did the 455 IF ok ????but the 10.7 IF ?is the problem? ??or are you all the way down to the FM ?detector ??? I was just looking ?quickly at the 62-A instructions. ? I did not see any indication of the sig gen output power/voltage so I wonder about that! ?you are saying that there is so much gain in the 7F8 mixer section ?that it somehow ?swamps out the Local oscillator ? ?but only at 10.7,not 455? IS this where you are? IF ALIGNMENT (10.7 MC) - Set the controls as follows: BAND SELECTOR. . . . . .. 27/56 mc range RECEIVE/STANDBY switch .. RECEIVE CALIB. XTAL switch ...... OFF NOISE LIMITER switch ..... OFF VOLUME .............. Near Maximum RECEPTION control. . AM SELEC TIVITY control. NORMAL/SHARP SENSITIVITY control . Near Maximum Set tuning dial pointer at approx. midscale. ? Connect the high side of the signal generator through an 0.1 mfd. capacitor to pin #1 of the 7F8 converter tube. Set signal generator at 10.7 mc and adjust slugs S-4,6.9,13 and 15 for maximum output. Now set slugs S-2 and S-l1 for maximum output but do not readjust slugs S-4 6.9, 13 and 15. 翱谤………………. Set RECEPTION control at FM and adjust slug S-16 for maximum output. Now set Slug S-7 for the null or minimum output as indicated on the output meter. Check the discriminator by slowly tuning the signal generator through 10 .7 mc and observe the two maximum audio level readings on the output meter. If the two peaks are equal the job is done ; if not it may be necessary to reset Slug S-16 until a reasonable balance is obtained. I don’t see how the RF gain[sensitivity] affects the 6F8, but that is a big schematic to try to digest. Somebody must know ? From: [email protected] [mailto:[email protected]] On Behalf Of Scott Petersen via groups.io
Sent: Sunday, March 16, 2025 4:40 PM To: [email protected] Subject: Re: [HallicraftersRadios] SX-62 alignment instructions ? Thanks, I tried(the correct way), but I'm having issues with the FM, it has so much gain in FM that the oscillator stops, until I reduce the RF gain, I have to align it on 2-3? on the RF gain to get anything out of it. going to start over and try again. ?
-- don??? va3drl |
开云体育
I did both alignments, and all seemed well until I switched in FM, and the gain was too high, and it wouldn't receive until I turned the RF control to 2-3, and only "works" in a small range, either too high, and oscillates and blanks, or too low a gain to hear
anything.
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 |
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 |
开云体育Scott, I’m not too smart and also can’t read between the lines and words.? What is oscillating?, and at what frequency? I guess you see it on a scope unless it is from the BFO and out the speaker.?? ? You mentioned nothing about the history and if you have ever had it receiving or not on any band. ? Will it work on AM/CW on all bands ? ?and it is just the FM detector? On FM what happens with the signal generator off and an antenna ..nothing?, stations? Oscillations most of the time? Is your RG gain pot in good shape, or is it noisy, erratic? ??? I have a sx-62 of some version in sick bay so I am extra curious but it will take a while to understand things. ? From: [email protected] [mailto:[email protected]] On Behalf Of Scott Petersen via groups.io
Sent: Sunday, March 16, 2025 9:26 PM To: [email protected] Subject: Re: [HallicraftersRadios] SX-62 alignment instructions ? I did both alignments, and all seemed well until I switched in FM, and the gain was too high, and it wouldn't receive until I turned the RF control to 2-3, and only "works" in a small range, either too high, and oscillates and blanks, or too low a gain to hear anything. ? ._,_ -- don??? va3drl |
don Root
Jim Whartenby