[ICOM] Icom 756PRO as contest rig

[Adam Farson]

Hi Ron,

On "tweaking up" the Pro3 power output, I completely agree; this is not a
good practice. IMD degrades quite rapidly if the design power rating is
exceeded (IMD3 can rise by 3 dB, and IMD5 by 5 dB, for every 1 dB increase
in Po over rated output.)

The additional stress on the PA output devices, and on passive components in
the PA, LPF etc., can also shorten the life of the radio. 

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 Ron NØAT
Sent: 01 July 2005 06:28
To: ICOM Reflector
Subject: Re: [ICOM] Icom 756PRO as contest rig


>Blair, k3yd   wrote:.

>The audio is clean and has less perceived distortion than some radios 
>I've operated.  This makes long operating intervals seem a little less 
>exhausting.

------------------------

I have noticed this also, when comparing the PROIII with some of the Yaesu 
rigs.   Some other contesters have mentioned the audio of the 1000D being 
especially harsh compared to the PROIII.

If you are a serious low power contest operator,  and you operate the ARRL 
contests, you will need a small amplifier to go with your PROIII.    ARRL 
allows up to 150 watts output in low power contest category.  After a 24
hour contest, some of the top ten scores are separated by less than 2 or 3
QSOs.  The difference between 100 and 150 watts more than makes up the
difference.  Don't be tempted to turn up the PROIII power to 150 watts.  Use
a small amplifier, and both the amplifier and the PROIII can limp along at
150 watts out.

73 de Ron  NØAT

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