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Re: [RTTY] AL-80B Or KPA500 for RTTY Contesting

To: rtty@contesting.com
Subject: Re: [RTTY] AL-80B Or KPA500 for RTTY Contesting
From: Jerry Flanders <jeflanders@comcast.net>
Date: Thu, 04 Aug 2016 16:57:38 -0400
List-post: <rtty@contesting.com">mailto:rtty@contesting.com>
Yaesu Quadra - has tuner for up to 3:1 SWR, has auto bandswitching as well as auto antenna switching (up to 4 different antennas). Handles up to 1200 w cw/ssb and rated for 500 keydown rtty.

Jerry W4UK

At 04:30 PM 8/4/2016, Joe Subich, W4TV wrote:
On 8/4/2016 4:02 PM, joeduerbusch wrote:
> What do you get over the AL80B for the extra money?  Solid state no
> tune-up, auto band switch and very fast QSK break-in.

But no tuner.  Unless you have very well tuned (low SWR) antennas for
every band (and all parts of the bands in which you operate) you will
need a manual tuner (losing the advantage to "no tune-up") or a high
power auto-tuner (more $$$) to make best use of the KPA500.

Don't get me wrong ... I'm an Elecraft fan but I don't know of any
solid state amplifier that will run correctly (and safely) into a
significantly (SWR >~ 1.5:1) mismatched load.  If the impedance is
low the devices will saturate (maximum current), if the impedance
is high the devices will clip (require higher voltage).  In either
case IMD and heat dissipation rise significantly.

73,

  ... Joe, W4TV


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