[AMRadio] T3 Mod iron specs - Audio limitations, harmonics, etc.

A.R.S. - WA5AM ars.w5ami at gmail.com
Wed Feb 20 18:02:25 EST 2008

Anyone know the approximate "designed" frequency range for a T-368
modulation transformer?

Also, if there is a website out there somewhere that has stock audio
specs on the popular commercial and military transmitters, I would be
interested in seeing it.

I think I know the answer to this, however I know there are a lot of
you out there that have a lot more knowledge than I do on the
Let's say your transmitter is limited for 200 to 3000 cycles in the
audio section, either by coupling caps, cathode bypass, cathode
resistors, plate loading, and any transformers...  what is the result
of using an external EQ and audio chain that pumps audio from the mic
that is beyond either end of the audio range the transmitter is
allowed by design to pass?

I think this is a common mistake that a lot of us make that can cause
some serious harmonics and other artifacts.  I'd like to see a
discussion on this if any of you experts would care to chime in ;)

Brian / wa5am

"Money is only temporary, radios are forever" - Jim Little aka "the
old dawg"/K5BAI

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