Questions about Bob A IF Alignment Series on YouTube

[bandersen]

No, do it the way they describe with a sweep generator. Always follow the alignment instructions.

It is not a staggered tuned IF. Look at the schematic for the video IF. Notice there are no coupling transformers between stages?
It capacitively coupled with peaking coils. It's a different way of creating the desired IF response.

[Chris K]

Originally Posted by bandersen

No, do it the way they describe with a sweep generator. Always follow the alignment instructions.

It is not a staggered tuned IF. Look at the schematic for the video IF. Notice there are no coupling transformers between stages?
It capacitively coupled with peaking coils. It's a different way of creating the desired IF response.

Yes I see that now. Thank you! Unfortunately my B&K 415 only puts out about 30 MHz at the lowest IF output setting and this requires 25.0 as the center point. I wouldn't be able to use the markers either...I'd need an external marker unit. I do have a decent Knight frequency generator that I have dialed in at 25 MHz using my scope but I can't sweep. I do have a Knight sweep generator I restored but it's electromechanical and I would need to calibrate it first.

[Electronic M]

Originally Posted by Chris K

Yes I see that now. Thank you! Unfortunately my B&K 415 only puts out about 30 MHz at the lowest IF output setting and this requires 25.0 as the center point. I wouldn't be able to use the markers either...I'd need an external marker unit. I do have a decent Knight frequency generator that I have dialed in at 25 MHz using my scope but I can't sweep. I do have a Knight sweep generator I restored but it's electromechanical and I would need to calibrate it first.

There's an old thread here on Videokarma where someone with a B&K 415 found cheap modern RF hobby oscillator boards and came up with a way to externally heterodyne the 415s output down to the old 21MHz TV if standard and use it to align early sets. It might be worth digging up.

[Chris K]

Originally Posted by Electronic M

There's an old thread here on Videokarma where someone with a B&K 415 found cheap modern RF hobby oscillator boards and came up with a way to externally heterodyne the 415s output down to the old 21MHz TV if standard and use it to align early sets. It might be worth digging up.

I'll look Tom. Thank you