[ICOM] 756 Pro III Finals question

Adam Farson farson at shaw.ca
Thu Jan 20 14:36:11 EST 2005


Hi Kevin,

The PA transistors are 2SC5125's.

I do not recommend increasing the Po of a solid-state RF power amplifier
above the design rating (100W for the Pro3). IMD3 can degrade by as much as
3 dB, and  IMD5 by 5 dB, for every 1 dB increase in Po above the design
rating. There is also a risk of damage to the RF output devices, and to
passive components in the transmitter LPF and the autotuner.

Cheers for now, 73,
Adam VA7OJ/AB4OJ 

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Kevin Adam N9IWW
Sent: 20 January 2005 04:53
To: icom at mailman.qth.net
Subject: [ICOM] 756 Pro III Finals question

N9IWW I need the information on the type of finals in The 756 pro 3 please
need to know if I can turn up the output of the radio to drive my amp  I
have older amp that needs 125-130 watts to drive it it's home brew.
Any information would be big help.
 Thank you

N9IWW



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