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

Brett Gazdzinski brett.gazdzinski at verizon.net
Thu Feb 21 18:14:40 EST 2008

I think, if the other stages pass wide range audio, you
can boost the fidelity some with EQ, but I would not push it
to hard.
In most cases, you dont really need to, you just need to correct
for a crappy microphone and your voice.
I think we have all heard people who sounded great running stock rigs like
the 32V3
and a decent mic.
I dont remember who it was, but I do remember someone just like that,
stock 32V3 and a Sure 55s or something like that.
I dount think he would have sounded better on a broadcast rig.

But the mod iron can alter your voice, some need
less bass, other people sound better with some boost.

I used to run a CVM5 mod trans, and when I got the RCA transformers,
sold the cvm5 because it sounded so poor compaired to the RCA.

I think the trick of running everything gently helps, gentle EQ, gentle
gentle modulator output, gentle final power percentage,
gentle modulation percentage.

Its best it build big and run it easy, with as much audio power output
avalable as  rf power input.


----- Original Message -----
From: "A.R.S. - WA5AM" <ars.w5ami at gmail.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Wednesday, February 20, 2008 6:02 PM
Subject: [AMRadio] T3 Mod iron specs - Audio limitations, harmonics, etc.

> 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
> specifics...
> 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 ;)
> 73
> Brian / wa5am
> --
> "Money is only temporary, radios are forever" - Jim Little aka "the
> old dawg"/K5BAI
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