RE: LF: Wilkinson combiners - More

["Clemens Paul" <cpaul@gmx.net>]

Hi Chris,

I've found additional info on the broadband Wilkinson combiner on my hard disk,
which I believe stems from an old ANZAC data book.
The info refers to T2 and there are two ways of how it can be made.
Type 1 corresponds to the design shown in the mini circuits application note
with the bridging resistor on the 100Ohm side of the transformer
and type 2 is exactly the design which Jay is using with the bridging resistor 
on the 
25Ohm side.
Beside the pictorial view schematics and equivalent circuits are shown for 
better understanding.

73
Clemens
DL4RAJ 


>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org 
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Chris Wilson
>Sent: Monday, April 10, 2017 12:47 PM
>To: Markus Vester
>Subject: Re: LF: Wilkinson combiners
>
>Hello Clemens, Markus, Alan, Graham and all who replied re my 
>combiner questions,
>
>Some  great  and  patiently  presented  info  here, thanks a bunch for
>explaining  it  so  well  and in such detail. I now have a much better
>grasp  of how the wide and narrow band ones work and why a narrow band
>combiner  might work best with pre filtered outputs sent to its input.
>I  will  build  the W1VD design as I already have ferrites to do this,
>before  buying  hard  to get (in the UK) and costly big iron cores for
>building  a second W1VD LPF bank. If the W1VD combiner is not suitable
>I  may  well buy 3 more iron cores and build a second LPF. I will also
>try  some low inductance resistors instead of the wire wounds, and look
>at  the wire wounds with my AIM analyzer. Thanks agin everyone. Off to
>mow the lawn or I won't get a lift to and from the pub tonight ;)
>
>
>> Hi Chris,
>
>> either method should work: two separate T-type lowpass filters
>> after each PA will reflect the harmonics before they reach the
>> narrowband combiner. Or build Jay's broadband combiner, which will
>> pass on the harmonics to the T-lowpass instead of shunting 
>them to ground.
>
>> Best 73,
>> Markus (DF6NM)
>
>
>
>-- 
>Best regards,
> Chris                            mailto:dead_fets@gmail.com
>
>

Type 1 Wilkinson Divider.png
Description: PNG image

Type 2 Wilkinson Divider.png
Description: PNG image