Date: Sat, 5 May 2012 20:59:29 +0930
From: "Leigh Turner" <invertech@frontierisp.net.au>
Subject: Re: [Amps] The power of an oversized electrolytic capacitor /
overkill
I agree Rob; a fraction of that massive HV PS capacitance would create an
unperceivable difference in the Tx performance and signal at a distant Rx
station :-)
Leigh
VK5KLT
### Leigh, how many UF in your opinion, do you suggest I use on a 7.7 kv No
load B+ supply.
What is the bare minimum I could get away with. I’m being serious here. Rich
Measures has a friend
with a 4-1000 amp...and he only uses 2 uf for a filter cap..and No choke
anywhere. Nobody hears any hum.
On a similar note, a friend was on one night, toggling between his SB-220
and his Alpha 9500. Nobody could tell the difference between the 1200w
of the SB-220.....and the 1500w of the Alpha 9500.
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Rob Atkinson
Sent: Saturday, 5 May 2012 8:53 PM
To: Jim Thomson
Cc: amps@contesting.com
Subject: Re: [Amps] The power of an oversized electrolytic capacitor
832 uF at 7.7 KV. No offense, but that's a waste of capacitors.
Rob
K5UJ
### I got them for dirt cheap. There is No way I would build something
like this by paying full price for new caps. I wouldn’t buy a brand new vac
cap
from jenning’s either, they are cost prohibitive. But I have managed to buy
surplus, nib, sealed in the box, jennings ceramic vac caps. They come encased
in a
metal foil bag which has been vac sealed. You poke a pen knife into it, and
whoosh, the air
rushs into the bag. Once bag is removed, then you unseal the box...and the new
vac cap is
inside a box, lined with foam rubber on all 6 x sides.
later... Jim VE7RF
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