[AMRadio] Modulator question.


cemilton at aol.com cemilton at aol.com
Fri May 7 17:47:54 EDT 2010


Hi Brian,

Do you have a modulation scheme in mind?   i.e., high-level, plate or controlled carrier or others????

While "rolling your own" can be done and certainly is rewarding when the whole magilla finally works...........there might be other avenues to explore.  For example, there are rigs like the Eico 720 when coupled to the Eico 730 modulator gives a pretty nice low-power signal.  Back issues of Electric Radio have one or two articles addressing this lashup.

The fairly common Heath DX-60 family of AM/CW transmitters provides a good base for some nice AM signals when used with an ordinary linear amplifier.  Done up right, they sound might impressive.  Again, some nice Electric Radio articles address the finer points.

But there are also opportunities for "low-power" AM rigs to be found in older ARRL handbooks and Bill Orr's publications over the years.  Pick your tube, design the power supply and the rest is relatively simple.

Just thinking out loud with you.  Others may have more/better ideas.  But accomplishing what you desire is not that difficult.  Let us hear back from you.  May be able to steer a particular design your way.

73
Chuck
W4MIL






-----Original Message-----
From: Brian Zwiener <bzwiener at sbcglobal.net>
To: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
Sent: Fri, May 7, 2010 4:49 pm
Subject: Re: [AMRadio] Modulator question.


Speaking of AM Transmitters, does anyone have a source for plans to build an AM 
ransmitter for 75 meters in the 15-25 watt range?Thanks.
 Brian/KF5CCN
--- On Fri, 5/7/10, RICHARD GEORGE <k6kwq at msn.com> wrote:
From: RICHARD GEORGE <k6kwq at msn.com>
ubject: [AMRadio] Modulator question.
o: "amlist" <amradio at mailman.qth.net>
ate: Friday, May 7, 2010, 2:34 PM
I have over the years built several low power AM transmitters. I would like 
o build something a little bigger say in the 400-500 watt plate modulated. 
 have been kicking around the idea of using one of the solid state 
mplifiers made for car audio driving a reverse connected audio transformer. 
 have seen these audio output transformers available in the 200 watt range. 
 understand that the RF output stage would have to be designed to fit the 
mpedence of the output transformer.  Does this sound like it could be done?
K6KWQ Dick
Amps by "MORE POWER" 
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