Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 4F2723800008A; Thu, 29 Sep 2011 14:28:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R9LKd-0004bw-4n for rs_out_1@blacksheep.org; Thu, 29 Sep 2011 19:27:39 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R9LKc-0004bn-AU for rsgb_lf_group@blacksheep.org; Thu, 29 Sep 2011 19:27:38 +0100 Received: from defout.telus.net ([204.209.205.32]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R9LKb-0008EA-3C for rsgb_lf_group@blacksheep.org; Thu, 29 Sep 2011 19:27:38 +0100 Received: from edmwcm03 ([204.209.205.31]) by priv-edmwes23.telusplanet.net (InterMail vM.8.01.03.00 201-2260-125-20100507) with ESMTP id <20110929182734.HJJA6315.priv-edmwes23.telusplanet.net@edmwcm03> for ; Thu, 29 Sep 2011 12:27:34 -0600 Received: from [192.168.1.102] ([75.157.171.5]) by edmwcm03 with bizsmtp id eiTZ1h01h07LRq301iTZxF; Thu, 29 Sep 2011 12:27:34 -0600 X-Authority-Analysis: v=1.1 cv=AT56dD37hoDZTZ4tkl1rQVnDD/6uKityIVLf1APWuH4= c=1 sm=2 a=342EsJ9rKw4A:10 a=LGgl8L9ij00A:10 a=aatUQebYAAAA:8 a=F3M5lZpKAAAA:8 a=nN7BH9HXAAAA:8 a=6j7o1RHEJL3fDWicLyUA:9 a=wPNLvfGTeEIA:10 a=rBKJJ2Jc0C4A:10 a=wk6s2zzMB60A:10 a=muIvw5a9-cgA:10 a=dmxtnI64yKhI2ZwI:21 a=aT1ZV71rRi-WxfeF:21 a=M76pUFywn4gKTBfU3e4A:9 a=FD2XTGWDbU9rcHsKqiEA:7 a=RfDFci1wJsCGf0XS:21 a=MGTwB-BU6YRcR5O0:21 X-Telus-Outbound-IP: 75.157.171.5 Message-ID: <4E84B895.2060905@telus.net> Date: Thu, 29 Sep 2011 11:27:33 -0700 From: Scott Tilley User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.2) Gecko/20110902 Thunderbird/6.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org 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> In-Reply-To: <006901cc7ed0$1643a110$0401a8c0@xphd97xgq27nyf> X-Spam-Score: 1.7 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,MAILTO_TO_SPAM_ADDR=0.276,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Wilkinson combiner Content-Type: multipart/alternative; boundary="------------060509090302080703050208" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.7 required=5.0 tests=FROM_ENDS_IN_NUMS,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: 0:2:499869856:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d604e4e84b8e52187 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------060509090302080703050208 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Thanks Mal Hope you have success with this. 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 On 9/29/2011 10:49 AM, mal hamilton wrote: > Scott > A nice neat job, tidy build > . > mal > > ----- Original Message ----- > *From:* Scott Tilley > *To:* rsgb_lf_group@blacksheep.org > > *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: >> 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 >> > --------------060509090302080703050208 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Thanks Mal

Hope you have success with this. 

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



 

On 9/29/2011 10:49 AM, mal hamilton wrote:
Scott
A nice neat job, tidy build
.
 
mal
 
----- Original Message -----
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:
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 -----
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 -----
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
 



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