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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