[ICOM] SSB power out on 706

[David J. Ring, Jr.]

Sounds about right for SSB.

Remember - PEP is PEAK Envelope Power - it is the maximum instantaneous 
power - not the average power.

A good peak reading wattmeter would show that you hit 100 watts on peak - 
but if the range of your voice is 40 dB dynamic range, you power would vary 
from about 0.01 watt (one hundreth of a watt) to 100 watts.

Even with only a 10 dB dynamic range in your voice the power ratio would be 
10 watts to 100 watts.

So 50 watts on your power meter is a very reasonable reading - however you 
very well may be overdriving your transmitter!  I get about 75 watts when I 
go "HEEEEEEELLOOOOOOOOOOOOOOO" into the microphone, but on average, the 
meter reads about 40 watts for 100 watts PEP for my voice.

The dynamics of your voice are different than mine - you might have more or 
less indicated power - but your voice peaks still will hit 100 watts on SSB 
if your transmitter is adjusted correctly - but your power indication might 
be 10 watts or 40 watts depending on your voice.

73

David N1EA
----- Original Message ----- 
From: "John Geiger" <w5td at lcisp.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Thursday, June 22, 2006 12:44 AM
Subject: [ICOM] SSB power out on 706


I was testing out an Icom 706MKII I got recently, and the power out on SSB 
looks low.  It is putting out about 90 watts on RTTY and FM, but when I go 
to SSB, using a PEP wattmeter (requiring 12 volts) it is only reading about 
40 watts.  Is that normal for SSB, or is it running low?  I know that power 
out will look low on a regular watt meter on SSB, which is why I was using 
the PEP wattmeter.

If the power is low on SSB only, any ideas as to what could be wrong?  I had 
the compressor on, and the mic gain was set on 7.  I was doing the testing 
into a dummy load, so there is no problem with SWR.

73s John W5TD
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