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

[Jerry Flanders]

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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