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Old 20th Oct 2020, 8:30 am   #18
trh01uk
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Join Date: Nov 2010
Location: Ross-on-Wye, Herefordshire, UK.
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Default Re: Hallicrafters SX-43 2nd I.F. won't peak

Quote:
Originally Posted by Radio Wrangler View Post
One other thing to add in is the possibility that the IF design may be such that one coil in an IFT is fairly heavily damped/loaded and that as a consequence the tuning is very broad.........

That doesn't quite fit with what the OP originally observed:

"
......the primary a.m. transformer will not peak. the upper primary adjuster continues to increase signal amplitude as its screwed in until it runs out of thread ......."

So what we have is a change of response from the coil but apparently the peak (if there is one) is outside the available travel of the core.

Having said that, what may be helpful is to turn this around and ask "What frequency does this primary coil actually resonate at?" And find that by taking the sig gen over a range of frequencies until a peak is found. Of course the secondary will contribute its own peak, but I am expecting to find two peaks, based on what was said above.


Richard
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