| :::::You won’t get anything at 455KC with the IF being so far off. Turn the attenuator up on the signal generator, then adjust the 2nd IF first. Then the first. When you start getting a signal though, turn the attenuation back down. ::::: ::::: ::::Well tried as you suggested, had to start where I got a signal at 640, then kept turning the generator down about 10 kz at a time then adjusted the IF's till the signal came thru , kept doing that till I got down to about 590 and ran out of adjustment on the IF screws. but it did make a difference on the dial readings they are closer to where they should be. the high end my local station at 1440 is now at 1520 espn 1000 tunes in at 1100 alot closer than before . I must have a mica or something out to prevent the IF's from resonating at 455... guess I will start subing caps. :::: :::Hi Elton, ::: Can you get the second IF to tune to 455? There has to be something not right inside an IF can to cause that. ::: As a bizaar possibility the IF tube could have high plate to supressor grid capacitance. That is a really weird failure for a tube, though. If you have another IF tube you may want to try it, but I wouldn't order a tube for that reason because it is such an odd failure. ::: :::Best Regards, ::: :::Bill Grimm ::: ::Hi Bill, Yes I don't get it either never came across anything like this before, if I set the generator to 455 and inject to the grid of the converter tube, I can tune the volume all the way up and rock the screws on the cans all the way to either end , and wont get a thing , but if I rock the dial on my generator the signal shows up at 640 on my generator, as I said in a earlier post tried to walk the signal down to 455 on the radio but not enough adjustment in the can to allow it. I did have a broken wire on the coil , but only took a 1/4 inch piece to complete the circuit , don't think would throw off the radio that much? ::E. :: :Hi Elton, : Your oscillator coil isn't the problem with you IF being off. The signal is injected after the oscillator. 640KHz is seriously abnormal for an IF and both IF cans being off like this seems very unlikely. How sure are you of the signal generator's calibration. Both IF cans being unable to tune down to 455 seems very suspicious. : :Best Regards, : :Bill Grimm : Bill, I have checked my generator with my digital SW radio and it is only off about 5hz which 455 is really around 460. This radio was thrown out to the road and has sat in my basement for about 5 years, just decided to see if I could get it going again. the varible cap has rust on the adjustment nuts , so I know I could not turn them even if I wanted to. but this radio had no reception at all but found it was due to the coil having a broken wire, Who's to say that someone had not fiddled with the cans . is there a alternative to try and get these cans at 455 can I inject directly into the cans? Thanks IPAddress: ***.227.146.239 |
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