Dev, Ceramic disc is available in shops selling comps for TV repair , most of the time its rated for 1-4Kv and the values i have seen and brought before is 120PF 330 390 and 470, 0.01uf is much more easy to get.
But the sad part is none of the shops are now stocking electronic comps as the margin is thin and also not many is doing comp level servicing.I remember having brought this around 5yr back in velachery itself now the same shop is selling only electrical items ! I have used the design with 610 two in push pull with around 120W max. 73 Hari
--- On Wed, 5/11/11, Dev Ramaprabhu <vu2dev@yahoo.com> wrote:
From: Dev Ramaprabhu <vu2dev@yahoo.com>
Subject: Re: [HamBrewers] 73 watts okay but.........
To: HamBrewers@yahoogroups.com
Date: Wednesday, May 11, 2011, 4:13 PM
Dear Satyan (or shall I address you as my dear Sarath!), I have seen those circuits and we do use them in Morning QTH ,,,,, BUT..... the rating for those Capacitors as specified is a bit on the lower side, you see my dear friend ...... It is okay for them as they can make a few ohms in after sales etc...... but Knowing fully well 200 watts implies 141Volts on DUMMY load I would like to use higher rating...... Best regards, dev
From: vu3mes <satyansarath@gmail.com>
To: HamBrewers@yahoogroups.com
Sent: Wed, May 11, 2011 4:07:34 PM
Subject: Re: [HamBrewers] 73 watts okay but.........
http://www.w6kan.com/ssamp.html
Dev - try this link, this is a time-tested circuit and many ham brewers have it up and running.
73s vu3mes On 11 May 2011 16:03, Dev Ramaprabhu <vu2dev@yahoo.com> wrote:
Dear All,
As you might have seen the pics in the previous mail we have managed to combine two PAs and get almost 100watts but....... 100 watts on dummy load is 100volts peak and alas all our Capacitors are rated for 100Volts only so obviously we got to run at 73watts or below for safety!( on real ANTENNAS, not NOT DUMMYS) Now, dear all could you suggest some vendors/ shops/ types for Capacitors which would work let us say at 200 volts or more so that we could run a lil more output; somewhat like 400w d.c.input (I am afraid that's all we are allowed to run in our beloved India shining!) And just for info I am using a Wilkinson Combiner to get more output ( and run those Mosfets very Cool!!!!!) We would need the following values: 47pF, 100pF, 300pF/320pF, 470pF! Of course any one wants I could send the full schematic etc and the photo ( I Can't send as I need some youngster to convert from Camera to PC, hi hi hi hi) All the best and Do run full Legal limit! ( Not exactly anti-QRP but pls do experiment) dev, vnk, pwt --
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