[ICOM] Icom PW-1 Failures - How To

[Adam Farson]

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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