Re: LF: Wilkinson combiner

[Scott Tilley <sthed475@telus.net>]

Hi Mal

This was the original 2 port design I used to combine two 500W amps.  Works fine.  Steve, VE7SL uses this design done as well for his 1KW amp.

http://www3.telus.net/sthed/argo/wilk/

A possible benefit is that the combiner elements provide very good low pass filtering so you may not need a separate filter.   Make sure the LO chain of both amps is shared.

This design should be fine for your application and won't need ferrite.

73 Scott
VE7TIL



On 9/29/2011 8:34 AM, mal hamilton wrote:

Components would need to be hefty to handle two amps each one several hundred watts to get 1w erp on 137

Maybe the decca approach is better with just a transformer, 3 primary winding and one output winding, their method handles 1.2 K/watts without any strain.

g3kev

 

----- Original Message -----

From: mal hamilton

To: rsgb_lf_group@blacksheep.org

Sent: Thursday, September 29, 2011 8:46 AM

Subject: Re: LF: Wilkinson combiner

Scott

Two amplifiers to combine to one output. 2 ports in 1 port out

de mal/g3kev

 

----- Original Message -----

From: Scott Tilley

To: rsgb_lf_group@blacksheep.org

Sent: Wednesday, September 28, 2011 10:17 PM

Subject: Re: LF: Wilkinson combiner

Hi Mal

How many ports?

I personally prefer air core coils but iron dust work better than ferrite for this application.  Amidon #3 is the best.

Once I know the number of ports I can give you values.

Regards,
Scott


On 9/28/2011 10:59 AM, mal hamilton wrote:

LF/MF    Is anyone using a wilkinson combiner with LF amplifiers and if so what are the optimum paramaters for ferrite cores/windings

73 de mal/g3kev