[ICOM] Icom PW-1 on AM?

[Adam Farson]

Hi Bruce,

The PW-1 must be de-rated to 500W PEP or CW when operated from 120V mains.
This means that in AM mode, the resting-carrier output must not exceed 125W
(6 dB below PEP) to prevent carrier starvation.

http://www.qsl.net/ab4oj/icom/dsp_am.html 

The PW-1 PSU is not comfortable with the relatively poor line regulation on
a 120V mains supply.  I strongly urge you to install a 240V service for the
amplifier. If need be, you can jury-rig a 20A fused extension cord from your
clothes-dryer, stove or electric water-heater.

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 Bruce J. Howes
Sent: 22 October 2005 03:59
To: 'ICOM Reflector'
Subject: [ICOM] Icom PW-1 on AM?

Hello all,
 
Wanted to see what other folks may have experienced running the the Icom
PW-1 on AM.
I have been having problems where the audio seems to be clipped or even
disappear when operating on 160 meters.
Seems to work just fine on SSB and CW.
 
I have set the ALC as suggested, just to confirm as I am running on 120 vac,
the ALC should still be set to the ALC mark?
So should I retard the ALC and therefore the output power if I am running on
AM?
I know this is not a rig problem as I can use the 765 without the amp and
experience no problem.
 
Set up is as follows:
Icom 765
160 meter dipole feed with balanced line Heathkit 2060 transmatch Icom PW-1
running on 120 vac
 
Your input and suggestions are appreciated.
 
73 Bruce W1UJR



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