Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 39E16380000E0; Thu, 29 Sep 2011 15:06:31 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R9LSJ-0004nh-Cw for rs_out_1@blacksheep.org; Thu, 29 Sep 2011 19:35:35 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R9LSI-0004nY-Qe for rsgb_lf_group@blacksheep.org; Thu, 29 Sep 2011 19:35:34 +0100 Received: from out1.ip05ir2.opaltelecom.net ([62.24.128.241]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R9LSG-0008KL-Kp for rsgb_lf_group@blacksheep.org; Thu, 29 Sep 2011 19:35:34 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Aq4AACu5hE5cHYT4/2dsb2JhbABBmRCPA3iBTgUBAQUIAQEDSQIcEAEBAwUCAQMRBAEBCiUUAQQaBhYIBhMKAQICAQGHawS6CYcTBIJUhG6dTg X-IronPort-AV: E=Sophos;i="4.68,462,1312153200"; d="scan'208,217";a="356220050" Received: from host-92-29-132-248.as13285.net (HELO xphd97xgq27nyf) ([92.29.132.248]) by out1.ip05ir2.opaltelecom.net with SMTP; 29 Sep 2011 19:35:25 +0100 Message-ID: <008101cc7ed6$8db2fb00$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <002801cc7e08$6e9ec9c0$0401a8c0@xphd97xgq27nyf> <4E839D14.5080105@telus.net> <002f01cc7e84$49295490$0401a8c0@xphd97xgq27nyf> <004901cc7ebd$3d0db910$0401a8c0@xphd97xgq27nyf> <4E849D17.3030607@telus.net> <006901cc7ed0$1643a110$0401a8c0@xphd97xgq27nyf> <4E84B895.2060905@telus.net> Date: Thu, 29 Sep 2011 18:35:24 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,MAILTO_TO_SPAM_ADDR=0.276 Subject: Re: LF: Wilkinson combiner Content-Type: multipart/alternative; boundary="----=_NextPart_000_007E_01CC7ED6.8D61F4D0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MAILTO_TO_SPAM_ADDR autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:504461120:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40d54e84c1b74333 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_007E_01CC7ED6.8D61F4D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Go for the electric chair !! ----- Original Message -----=20 From: Scott Tilley=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, September 29, 2011 6:27 PM Subject: Re: LF: Wilkinson combiner Thanks Mal Hope you have success with this. =20 If reliability is key, consider using a three or four port version. I = use a 4 port version in my MOALFA amp. With more smaller amps you don't = need to push each individual amp as hard which is nice during fault = conditions or stormy weather. Never lost a FET on this amp. Well to be = truthful, I killed them all during the first test setup when I melted my = dummy load that had a faulty connection on the water cooling... I just noted Jim's comments and I agree with him about the efficiency = statement. My main motivation for creating my high power amp was the = lack of efficiency in my TX antenna system (poor vertical or big loop). = The final compromise was a big amp and a loop. The smaller multiple stages allows the use of less exotic ferrite = materials (I use TV flyback cores) and cheaper transistors etc etc = etc... My amp has two settings: Stun (1KW) and KILL (2KW) :-) Scott =20 On 9/29/2011 10:49 AM, mal hamilton wrote:=20 Scott A nice neat job, tidy build . mal ----- Original Message -----=20 From: Scott Tilley=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, September 29, 2011 4:30 PM Subject: Re: LF: Wilkinson combiner 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:=20 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 -----=20 From: mal hamilton=20 To: rsgb_lf_group@blacksheep.org=20 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 -----=20 From: Scott Tilley=20 To: rsgb_lf_group@blacksheep.org=20 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:=20 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 ------=_NextPart_000_007E_01CC7ED6.8D61F4D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Go for the electric chair !!
 
----- Original Message -----
From:=20 Scott = Tilley=20
Sent: Thursday, September 29, = 2011 6:27=20 PM
Subject: Re: LF: Wilkinson = combiner

Thanks Mal

Hope you have success with = this. =20

If reliability is key, consider using a three or four port=20 version.  I use a 4 port version in my MOALFA amp.  With = more=20 smaller amps you don't need to push each individual amp as hard which = is nice=20 during fault conditions or stormy weather.  Never lost a FET on = this=20 amp.  Well to be truthful, I killed them all during the first = test setup=20 when I melted my dummy load that had a faulty connection on the water=20 cooling...

I just noted Jim's comments and I agree with him = about the=20 efficiency statement.  My main motivation for creating my high = power amp=20 was the lack of efficiency in my TX antenna system (poor vertical or = big=20 loop).  The final compromise was a big amp and a loop.

The = smaller=20 multiple stages allows the use of less exotic ferrite materials (I use = TV=20 flyback cores) and cheaper transistors etc etc etc...

My amp = has two=20 settings:
Stun (1KW) and KILL=20 (2KW)

:-)

Scott



 

On = 9/29/2011 10:49=20 AM, mal hamilton wrote:=20
Scott
A nice neat job, tidy build
.
 
mal
 
----- Original Message ----- =
From:=20 Scott Tilley
To: rsgb_lf_group@blacksheep.org
Sent: Thursday, September = 29, 2011=20 4:30 PM
Subject: Re: LF: Wilkinson=20 combiner

Hi Mal

This was the original 2 port design I = used to=20 combine two 500W amps.  Works fine.  Steve, VE7SL uses = this=20 design done as well for his 1KW amp.

http://www3.telus.net/sthed/argo/wilk/
A=20 possible benefit is that the combiner elements provide very good = low pass=20 filtering so you may not need a separate filter.   Make = sure the=20 LO chain of both amps is shared.

This design should be fine = for=20 your application and won't need ferrite.

73=20 Scott
VE7TIL



On 9/29/2011 8:34 AM, mal hamilton = wrote:=20
Components would need to be hefty to = handle two=20 amps each one several hundred watts to get 1w erp on = 137
Maybe the decca approach is better with = just a=20 transformer, 3 primary winding and one output winding, their = method=20 handles 1.2 K/watts without any strain.
g3kev
 
----- Original Message ----- =
From:=20 mal hamilton
To: rsgb_lf_group@blacksheep.org =
Sent: Thursday, = September 29,=20 2011 8:46 AM
Subject: Re: LF: = Wilkinson=20 combiner

Scott
Two amplifiers to combine to one = output.=20 2 ports in 1 port out
de mal/g3kev
 
----- Original Message ----- =
From:=20 Scott Tilley
To: rsgb_lf_group@blacksheep.org =
Sent: Wednesday, = September 28,=20 2011 10:17 PM
Subject: Re: LF: = Wilkinson=20 combiner

Hi Mal

How many ports?

I = personally=20 prefer air core coils but iron dust work better than ferrite = for=20 this application.  Amidon #3 is the best.

Once I = know=20 the number of ports I can give you=20 values.

Regards,
Scott


On 9/28/2011 = 10:59 AM,=20 mal hamilton wrote:=20
LF/MF    Is anyone = using a=20 wilkinson combiner with LF amplifiers and if so what are = the=20 optimum paramaters for ferrite cores/windings
73 de mal/g3kev
=
 

=

------=_NextPart_000_007E_01CC7ED6.8D61F4D0--