Under modulation

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K9ACT:
I tried the easiest fix first and it seems to have worked.

I re-strapped the mod iron.  I am now using the 9K to 5.5k connections which gives me 1.25:1 voltage ratio.  This was 9K to 3.2K and 1.5:1 VR.

The positive peaks go right up (almost) to the 100% line using a sine wave.

Things aren't  quite so clear under voice mod but I think I will take the next step and build up a separate power supply for the modulator.  The plate current drop under modulation is much more obvious under sine wave modulation.

Thanks for the pointers.

js

Bacon, WA3WDR:
OK.  I would expect more than 100% modulation capability, though.  Are the negative peaks flattening at around 100% mod too?

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