[Boatanchors] Ampliphase

[Richard Knoppow]

----- Original Message ----- 
From: "Paul Baldock" <paul at paulbaldock.com>
To: <boatanchors at mailman.qth.net>
Sent: Sunday, July 10, 2011 6:22 PM
Subject: [Boatanchors] Ampliphase


> Has anybody ever designed and built an Ampliphase 
> Transmitter? Any
> schematics to share?
>
> Thanks
>
> - Paul  KW7Y
>
      Try searching for outphasing modulation or Chireix 
modulation. Ampliphase was a trade name used by RCA for a 
version of this. Its a clever idea that is hard to 
accomplish in practice as RCA found to their chagrin. The 
method was first (?) described by H.Chireix in a paper in 
the _Procedings of the Institute of Electrical Engineers_ in 
1935. Some very high power transmitters were built in Europe 
but proved too troublesom.
      In theory it should provide a low distortion, high 
efficiency method of modulation without the need for a 
modulation transformer, but its too critical of adjustment 
and did not prove practical.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com