About OFDM PA

Help and support for the BATC DTX1 ATV digital encoder and modulator system
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scsi
Posts: 1
Joined: Tue Mar 31, 2015 4:55 am

About OFDM PA

Post by scsi » Tue Mar 31, 2015 4:59 am

I want to design a PA for my OFDM at 433MHZ. The P1db shouldbe 2W,could you help to recommend a chip for this?Thanks

MN-tech
Posts: 55
Joined: Thu Aug 30, 2012 6:01 pm

Re: About OFDM PA

Post by MN-tech » Thu Apr 02, 2015 2:48 am

The RA07H4047M module should do very well. It's nominal 7 watt device but the peak to average power ratio of OFDM may need the overhead to prevent spectral growth. The gain is about 35 dB at 2 watts.

http://www.rfparts.com/ra07h4047m.html

oe7dbh
Posts: 55
Joined: Fri Feb 15, 2013 2:03 am

Re: About OFDM PA

Post by oe7dbh » Fri Apr 03, 2015 12:04 am

Hi
So let's be honest.
Even if you have an OFDM transmitter with -70dB Signal shoulder, and you want have a minimum of -40 dB signal shoulder Output with almost constant MER ..... then you get no more than:

800mW OFDM Signal with RA07H4047
5,0 Watt OFDM Signal with RA30H4047
9,0 Watt OFDM Signal with RA60H4047

http://www.oe7forum.at/viewtopic.php?f= ... =225#p1488

http://www.oe7forum.at/viewtopic.php?f= ... =180#p1394

http://www.oe7forum.at/viewtopic.php?f= ... =120#p1299

http://www.oe7forum.at/viewtopic.php?f=15&t=448

vy 73 Darko OE7DBH

g4wvu
Posts: 51
Joined: Sat Jun 22, 2013 10:42 am

Re: About OFDM PA

Post by g4wvu » Fri Apr 03, 2015 11:06 pm

DVB-T seems pretty bad news as far as generating sensible (DX) type power output is concerned. (Typical back-off 8-10dB !)
Makes DVB-S look very forgiving by comparisom....

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