12-15-2013, 11:08 PM
Evenin!
I seem to be having a little issue aligning the broadcast/police bands properly on this 41-315X. I can't get the entire band onto the scale. I can get it so I'm either missing 100 KHz in the upper portion of the band or the lower portion of the band on broadcast and about 700KHz on the Police Band. depending on which end I have it aligned to, it gradually goes further and further off the dial till I get to the opposite end of the broadcast band. I assume it's similar on the police band, but all I pick up there is Radio Havana it's off about 600 KHz.
when I'm doing the alignment I keep running out of adjustment (bottoming out) on 20 and 20a trimmers. I'm suspecting the osc transformer (32-2499). I've wondered about it since I first inspected it, it looks like it was messed with.
[Image: http://i1303.photobucket.com/albums/ag14...74237d.jpg]
[Image: http://i1303.photobucket.com/albums/ag14...ab88c6.jpg]
[Image: http://i1303.photobucket.com/albums/ag14...950f24.jpg]
I replaced that Aerovox cap (not knowing for sure if it was mica or not) with a 2200 pf film cap. I have since replenished my mica caps and have a 2000 pf one, not sure if the values are far enough off to make a difference. but for now, the film cap remains.
The schematic conveniently leaves off the ohm measurements for the transformers. Was wondering if anyone knew what they possibly should be. I've looked at the schematic for the 41-316, it has values on it. seems very similar around that portion of the circuit. however, the nostalgia air schematic is missing the parts list, so unsure if the part numbers are the same or not.
Was wondering if anyone knew what the values ought to be, if using the 41-316 as a guide would be a good idea? does anyone have that parts list?
41-316 schematic Nostalgia Air
Thanks a Bunch!
Bret
I seem to be having a little issue aligning the broadcast/police bands properly on this 41-315X. I can't get the entire band onto the scale. I can get it so I'm either missing 100 KHz in the upper portion of the band or the lower portion of the band on broadcast and about 700KHz on the Police Band. depending on which end I have it aligned to, it gradually goes further and further off the dial till I get to the opposite end of the broadcast band. I assume it's similar on the police band, but all I pick up there is Radio Havana it's off about 600 KHz.
when I'm doing the alignment I keep running out of adjustment (bottoming out) on 20 and 20a trimmers. I'm suspecting the osc transformer (32-2499). I've wondered about it since I first inspected it, it looks like it was messed with.
[Image: http://i1303.photobucket.com/albums/ag14...74237d.jpg]
[Image: http://i1303.photobucket.com/albums/ag14...ab88c6.jpg]
[Image: http://i1303.photobucket.com/albums/ag14...950f24.jpg]
I replaced that Aerovox cap (not knowing for sure if it was mica or not) with a 2200 pf film cap. I have since replenished my mica caps and have a 2000 pf one, not sure if the values are far enough off to make a difference. but for now, the film cap remains.
The schematic conveniently leaves off the ohm measurements for the transformers. Was wondering if anyone knew what they possibly should be. I've looked at the schematic for the 41-316, it has values on it. seems very similar around that portion of the circuit. however, the nostalgia air schematic is missing the parts list, so unsure if the part numbers are the same or not.
Was wondering if anyone knew what the values ought to be, if using the 41-316 as a guide would be a good idea? does anyone have that parts list?
41-316 schematic Nostalgia Air
Thanks a Bunch!
Bret
