[Icom] Icom Pro II and PW-1 (Do I have a problem here!)

Thu, 27 Jun 2002 13:41:18 +0200

Tnx for the hint Adam

73  OZ1EQC  Per

----- Original Message -----
From: "Adam Farson" <[email protected]>
To: <[email protected]>
Sent: Thursday, June 27, 2002 1:32 PM
Subject: RE: [Icom] Icom Pro II and PW-1 (Do I have a problem here!)


> Per,
>
> Simply adjust the ALC control on the PW-1 for 600W output in CW, RTTY or
FM
> mode.
>
> http://www.qsl.net/ab4oj/icom/occbw/main.html
>
> Best 73,
> Adam, VA7OJ/AB4OJ
> North Vancouver, BC, Canada
> http://www.qsl.net/ab4oj/
> Note new e-mail address:
> mailto:[email protected]
>
>
> Hi Adam
>
> Better ask stupid then burn of the linear :-)
>
> So here it come, I have the IC-4KL it works on 220V
> How can I adjust the setup so that no matter how the Pwr control knob on
my
> IC-746 is set, it will not put more than 600 Watt out ?
>
> Tnx in advance
>
> Per OZ1EQC
> IC-746, IC-4KL, SOMMER XP-508 (just ordered the XP-808)
>    Member of: EDR, ARRL, HSC
>             [email protected]
>       www.bekker-madsen.dk
>
> ----- Original Message -----
> From: "Adam Farson" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, June 27, 2002 1:19 PM
> Subject: RE: [Icom] Icom Pro II and PW-1 (Do I have a problem here!)
>
>
> > Hi Bill,
> >
> > The ALC in the PW-1 will hold the exciter output at the level required
to
> > drive the amplifier to the preset power output. If the PW-1 requires 80W
> of
> > drive to produce 1kW output. turning the transceiver's RF POWER control
up
> > to full output will make no difference, as tithe ALC line is regulating
> the
> > drive level.
> >
> > As the ALC is the amplifier's first line of defence, it is absolutely
> > mandatory to set it up correctly. Assuming that your Bird power meter is
> > accurate to within 5%,another method is to adjust the ALC for a reading
of
> 1
> > kW (into a dummy load!)
> >
> > Best 73,
> > Adam, VA7OJ/AB4OJ
> > North Vancouver, BC, Canada
> > http://www.qsl.net/ab4oj/
> > Note new e-mail address:
> > mailto:[email protected]
> >
> >
> > -----Original Message-----
> > From: [email protected] [mailto:[email protected]]On
> > Behalf Of Bill Tarkington
> > Sent: June 26, 2002 21:07
> > To: [email protected]
> > Subject: [Icom] Icom Pro II and PW-1 (Do I have a problem here!)
> >
> >
> > Having recently purchased a Pro II, I followed the owner manual
> instructions
> > for both the amp and radio to set the ALC level on the amp so as not to
> > overdrive it and risk FET damage.  Once all proper connections are made,
> > book says to adjust the exciter (Pro II) output to 100W, then turn ALC
> > adjustment screw clockwise slowly while key down on either CW/RTTY and
at
> > same time reading the ALC scale on the PW-1 control head until meter
> needle
> > is dead on the ALC adjust mark. Once adjusted thusly, key down at 100W
> from
> > the exciter and check PW-1 power meter to insure 1KW output.  Did all
this
> > and all looked to be okay.  HOWEVER, I noted that the RF power knob on
the
> > ProII was not fully clockwise (wide open).  Advancing it to full open
> seemed
> > to indicate the Pro  II was putting a little something in excess of 100W
> per
> > its power meter.  Bottom line is, I do not know what meters to trust
here.
> > Out of curiosity, got out the Bird 43 Watt meter with 1000W slug therein
> and
> > did some checking. First used the Bird meter with 100W slug to set
> barefoot
> > output on the ProII at precisely 100W and left it there(  little less
than
> > full open). Further testing with the Bird in and out of the circuit with
> the
> > PW-1 output seems to indicated the Pro's watt meter is pretty accurate,
> but
> > the power meter on the PW-1 is reading low.  If do the ALC adjustment
> using
> > the PW-1 power and alc meters per book,Bird says full amp output is
860W,
> > not 1KW the PW-1 watt meter indicates. If do the ALC adjustment using
just
> > the Bird meters readings while ignoring the PW-1, the ALC goes into the
> red
> > some little way, and the output per the Bird is about 1250W.  All this
> > leaves me wondering which watt meter to trust to obtain the full 1KW
> output
> > of the amp. If use the Bird and guess wrong, will 1250W out with ALC
being
> a
> > little in the red likely cause me some amp damage?  The safe thing to
do,
> of
> > course, is go with the PW-1.. BUT, I want them to agree more or less
with
> > one another or understand why not.  Incidentally, if it matters, all
tests
> > were done into a  1500W dummy load.  Am I missing something here?
> Comments
> > please. Bill, K3YC
> >
> > ----
> > Your Moderator: Dick Flanagan W6OLD, [email protected]
> > Icom FAQ: http://www.qsl.net/icom/
> >
> >
> > ----
> > Your Moderator: Dick Flanagan W6OLD, [email protected]
> > Icom FAQ: http://www.qsl.net/icom/
> >
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom FAQ: http://www.qsl.net/icom/
>
>
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom FAQ: http://www.qsl.net/icom/
>