02-06-2021, 03:46 PM
Does anyone have a good experience aligning FM on this radio or similar ones?
I attempted the alignment; nothing really worked the way the guide says.
First it wants to put un-modulated 9.1MHz into the grid of FM1000 tube.
Then put the tuning into a "quiet position".
It says I should hear beatings and should minimize them.
OK, I heard them not.
Then I decided that it is possible the cap is aligned such that I already have no beatings; then I should put AM modulated signal, also 9.1MHz and I should hear the sound, then find two peaks and align to the minimum between them. I did not hear anything, except in two points on the dial.
OK then they said to measure the AVC with the unmodualted 9.1MHz and align to maximum value. Trimming the cap did not change the AVC voltage value at all.
All in all, now what reception I had had before, I have no longer.
I have never aligned an FM, this is my first.
Any good advice/tricks/etc?
I attempted the alignment; nothing really worked the way the guide says.
First it wants to put un-modulated 9.1MHz into the grid of FM1000 tube.
Then put the tuning into a "quiet position".
It says I should hear beatings and should minimize them.
OK, I heard them not.
Then I decided that it is possible the cap is aligned such that I already have no beatings; then I should put AM modulated signal, also 9.1MHz and I should hear the sound, then find two peaks and align to the minimum between them. I did not hear anything, except in two points on the dial.
OK then they said to measure the AVC with the unmodualted 9.1MHz and align to maximum value. Trimming the cap did not change the AVC voltage value at all.
All in all, now what reception I had had before, I have no longer.
I have never aligned an FM, this is my first.
Any good advice/tricks/etc?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
