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Author Topic: DRAKE TR-4C  (Read 3642 times)
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AE1CT
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« on: June 23, 2011, 10:43:48 PM »

DOES ANYONE KNOW HOW MUCH POWER THE DRAKE TR-4C PUTS OUT ON AM? I HAVE A CHANCE TO GET ONE AND WOULD LIKE TO KNOW IF IT WILL WORK FOR ME ON AM. I KNOW IT DOES 150 WATTS ON SSB AND 130 WATTS ON CW BUT DONT KNOW ABOUT AM POWER OUT.
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Jim KF2SY
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« Reply #1 on: June 24, 2011, 12:21:45 AM »


My TR4CW/RIT does about 12 watts resting carrier with no modulation.  When you talk, the controlled carrier goes up to about 40 watts carrier (about 160 Watts pep).  Hope this helps. 
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WQ9E
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« Reply #2 on: June 24, 2011, 11:11:28 AM »

It transmits only one sideband on AM which is generally not a problem.  However if the station in contact with you has his receiver set up to receive only one sideband that will be an issue.  I have run into this a couple of times as a net control operator when I select one sideband on AM receive to avoid QRM above or below.  In most operation this will rarely be an issue.

The controlled carrier system used by the Drake 4 line works very well with linear amps designed for SSB and many can be used at their full SSB rating with this system.
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Rodger WQ9E
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"Let's go kayaking, Tommy!" - Yaz


« Reply #3 on: June 24, 2011, 11:28:52 AM »

http://www.amwindow.org/tech/htm/t4.htm

Here's some simple mods to make the T-4 Drake line sound FB on AM.  (Seven simple steps)

I have personally done the T-4X and understand that the TR3/4 models use basically the same circuitry for AM.

Take out your schematic and see if it applies to your TR4-C.  The fidelity obtained with these mods is well worth the effort.


73,
Tom, K1JJ
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Use an "AM Courtesy Filter" to limit transmit audio bandwidth  +-4.5 KHz, +-6.0 KHz or +-8.0 KHz when needed.  Easily done in DSP.

Wise Words : "I'm as old as I've ever been... and I'm as young as I'll ever be."

There's nothing like an old dog.
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