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Date: Thu, 29 Sep 2011 11:27:33 -0700
From: Scott Tilley <sthed475@telus.net>
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Subject: Re: LF: Wilkinson combiner
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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 <mailto:sthed475@telus.net>
> *To:* rsgb_lf_group@blacksheep.org
> <mailto: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 <mailto:g3kevmal@talktalk.net>
>> *To:* rsgb_lf_group@blacksheep.org
>> <mailto: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 <mailto:sthed475@telus.net>
>> *To:* rsgb_lf_group@blacksheep.org
>> <mailto: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
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<body bgcolor="#FFFFFF" text="#000000">
Thanks Mal<br>
<br>
Hope you have success with this. <br>
<br>
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...<br>
<br>
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.<br>
<br>
The smaller multiple stages allows the use of less exotic ferrite
materials (I use TV flyback cores) and cheaper transistors etc etc
etc...<br>
<br>
My amp has two settings:<br>
Stun (1KW) and KILL (2KW)<br>
<br>
:-)<br>
<br>
Scott<br>
<br>
<br>
<br>
<br>
<br>
On 9/29/2011 10:49 AM, mal hamilton wrote:
<blockquote cite="mid:006901cc7ed0$1643a110$0401a8c0@xphd97xgq27nyf"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta content="MSHTML 6.00.2600.0" name="GENERATOR">
<div><font face="Arial">Scott</font></div>
<div><font face="Arial">A nice neat job, tidy build</font></div>
<div><font face="Arial">.</font></div>
<div> </div>
<div><font face="Arial">mal</font></div>
<div> </div>
<blockquote style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px;
MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT:
0px">
<div style="FONT: 10pt arial">----- Original Message ----- </div>
<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color:
black"><b>From:</b> <a moz-do-not-send="true"
title="sthed475@telus.net" href="mailto:sthed475@telus.net">Scott
Tilley</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a
moz-do-not-send="true" title="rsgb_lf_group@blacksheep.org"
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a>
</div>
<div style="FONT: 10pt arial"><b>Sent:</b> Thursday, September
29, 2011 4:30 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re: LF: Wilkinson
combiner</div>
<div><br>
</div>
Hi Mal<br>
<br>
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.<br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www3.telus.net/sthed/argo/wilk/">http://www3.telus.net/sthed/argo/wilk/</a><br>
<br>
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.<br>
<br>
This design should be fine for your application and won't need
ferrite.<br>
<br>
73 Scott<br>
VE7TIL<br>
<br>
<br>
<br>
On 9/29/2011 8:34 AM, mal hamilton wrote:
<blockquote
cite="mid:004901cc7ebd$3d0db910$0401a8c0@xphd97xgq27nyf"
type="cite">
<meta content="MSHTML 6.00.2600.0" name="GENERATOR">
<div><font face="Arial">Components would need to be hefty to
handle two amps each one several hundred watts to get 1w
erp on 137</font></div>
<div><font face="Arial">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.</font></div>
<div><font face="Arial">g3kev</font></div>
<div> </div>
<blockquote dir="ltr" style="PADDING-RIGHT: 0px; PADDING-LEFT:
5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid;
MARGIN-RIGHT: 0px">
<div style="FONT: 10pt arial">----- Original Message ----- </div>
<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial;
font-color: black"><b>From:</b> <a
title="g3kevmal@talktalk.net"
href="mailto:g3kevmal@talktalk.net"
moz-do-not-send="true">mal hamilton</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a
title="rsgb_lf_group@blacksheep.org"
href="mailto:rsgb_lf_group@blacksheep.org"
moz-do-not-send="true">rsgb_lf_group@blacksheep.org</a>
</div>
<div style="FONT: 10pt arial"><b>Sent:</b> Thursday,
September 29, 2011 8:46 AM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re: LF:
Wilkinson combiner</div>
<div><br>
</div>
<div><font face="Arial">Scott</font></div>
<div><font face="Arial">Two amplifiers to combine to one
output. 2 ports in 1 port out</font></div>
<div><font face="Arial">de mal/g3kev</font></div>
<div> </div>
<blockquote style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px;
MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid;
MARGIN-RIGHT: 0px">
<div style="FONT: 10pt arial">----- Original Message -----
</div>
<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial;
font-color: black"><b>From:</b> <a
title="sthed475@telus.net"
href="mailto:sthed475@telus.net"
moz-do-not-send="true">Scott Tilley</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a
title="rsgb_lf_group@blacksheep.org"
href="mailto:rsgb_lf_group@blacksheep.org"
moz-do-not-send="true">rsgb_lf_group@blacksheep.org</a>
</div>
<div style="FONT: 10pt arial"><b>Sent:</b> Wednesday,
September 28, 2011 10:17 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re: LF:
Wilkinson combiner</div>
<div><br>
</div>
Hi Mal<br>
<br>
How many ports?<br>
<br>
I personally prefer air core coils but iron dust work
better than ferrite for this application. Amidon #3 is
the best.<br>
<br>
Once I know the number of ports I can give you values.<br>
<br>
Regards,<br>
Scott<br>
<br>
<br>
On 9/28/2011 10:59 AM, mal hamilton wrote:
<blockquote
cite="mid:002801cc7e08$6e9ec9c0$0401a8c0@xphd97xgq27nyf"
type="cite">
<meta content="MSHTML 6.00.2600.0" name="GENERATOR">
<style></style>
<div><font face="Arial">LF/MF Is anyone using a
wilkinson combiner with LF amplifiers and if so what
are the optimum paramaters for ferrite
cores/windings</font></div>
<div><font face="Arial">73 de mal/g3kev</font></div>
<div> </div>
</blockquote>
<br>
</blockquote>
</blockquote>
</blockquote>
<br>
</blockquote>
</blockquote>
<br>
</body>
</html>
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