[ICOM] Icom PW-1 Failures - How To

[we1x at comcast.net]

Went back and tried it..I stand corrected.

thanks Adam.

Harry WE1X

-------------- Original message -------------- 

> Hi Harry, 
> 
> To quote the PW1 user manual, p. 2: 
> 
> When the linear amplifier is OFF, the [AMP/PROTECT] 
> does not light and the exciter's signal is applied to one of 
> the output connectors or the IC-PW1's antenna tuner. 
> 
> Ibid., p. 14, top: 
> 
> This antenna tuner is also used when the linear amplifier 
> is turned OFF. 
> 
> The Yaesu Quadra can also be configured with ATU on-line and PA stage 
> off-line: [OPERATE] key off, [TUNER] key on. 
> 
> The ATU insertion loss is approx. 0.5 dB. 
> 
> 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 we1x at comcast.net 
> Sent: 08 June 2005 12:03 
> To: ICOM Reflector 
> Subject: RE: [ICOM] Icom PW-1 Failures - How To 
> 
> Yes. But if I recall correctly (which is not all that often) the PW-1's ATU 
> is not engaged unless the PA stage is on-line. 
> 
> Harry WE1X 
> 
> -------------- Original message -------------- 
> 
> > Hi Mike, 
> > 
> > Agreed. In general terms, the exciter's internal autotuner is not 
> > needed when driving a solid-state amplifier. To my knowledge, all 
> > solid-state HF and HF/6m amplifiers have a broadband input circuit 
> > which presents a flat 50-ohm resistive load to the exciter. 
> > 
> > If matching is required, the amplifier's internal ATU (if fitted) can 
> > be left in the signal path when the PA stage is off-line. It will 
> > match the load, and provide some additional preselection on receive. 
> > 
> > http://www.qsl.net/ab4oj/quadra/sshfamp.html 
> > 
> > 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 Mike McCarthy, W1NR 
> > Sent: 08 June 2005 10:49 
> > To: 'ICOM Reflector' 
> > Subject: RE: [ICOM] Icom PW-1 Failures - How To 
> > 
> > Better read the manual. It states NOT to use the rig's internal tuner 
> > when using the PW-1! 
> > 
> > Mike, W1NR 
> > 
> > 
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> 
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