[Amps] Pair of SB-220s

[Geert Stams]

On 432MHz Tim Pettis KL7WE used to activiate a number of states on EME 
with a couple of K2RIW amplifiers parallelled with an hybrid made out of 
coax

http://pa3csg.hoeplakee.nl/Boek/BoekH1/art1-26.html

73's Geert PA3CSG


Alex Eban schreef:
> Can be done!
>
> The best way is to use 3dB/90° hybrids since they tend to discourage
> oscillation and improve matching. They are also quite forgiving of
> imbalances in the amplifiers’ input and output impedances.
>
> Alex   4Z5KS
>
>  
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of donroden at hiwaay.net
> Sent: Sunday, September 06, 2009 7:40 AM
> To: amps fourm
> Subject: [Amps] Pair of SB-220s
>
>  
>
> Not saying anybody WOULD,,,,,,,,,,, but if you COULD.....
>
> parallel a pair of SB-220s on a single band ?
>
> Wilkinson Power deviders / combiners for zero phase combining?
>
> A 90 degree network on the input and opposite 90 degree on output ?
>
> Run them in push-pull ( 180 degrees )
>
>  
>
> Assuming all splitters/ combiners would be made from coax.
>
>  
>
> Or, just use short runs of equal length coax and a coax tee for the inputs
>
> and accept a 2:1 drive mismatch ?
>
>  
>
> Hummmmmmm
>
>  
>
>  
>
> Don WA4NPL
>
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