Date: Tue, 16 Nov 2010 19:01:35 -0500
From: Dave M <slash_dot@msn.com>
Subject: [Amps] Capacitor Values
To: <amps@contesting.com>
Message-ID: <BAY148-w48EAA1C76551142BA2116580380@phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Well as luck has it just as I am putting together my tuned input my LCR meter
went south ( my own fault for getting something cheap off Ebay ) I have some
compression trimmers I am trying to find values for , is there anyone with an
old catalogue or reference to Unelco stock , the trimmers are numbered :
495A02
495A03
495A04
495A05
I will get a new meter soon but any help would allow me to select the proper
values until I do
......................................................................................................
73 VE3DV , Dave
## why not just use Arco compression trimmers ? Get the big ones for the low
bands, which require minimal padding.
High bands require no padding. Adjustment for flat swr when done..is a snap.
If you want a real LCR meter, get a B+K 875-B. [ mouser]. Then you
have
.1pf resolution below 200 pf. It will give you 1 pf resolution above 200
pf. Read's
caps up to 20,000 uf. It will read uh down to .1 uh. Great for coils. It
reads AC
resistance...down to .001 ohm . I also use the ac ohms to do stuff like
read the
ESR on hv lytics. 3 yr warranty, industry standard. I also have the older
875-A. [bought in 1990]
Both work flawless, and #1 tool when building linears, tuned inputs, and
pi/pi-L tanks.
The inductance scales go from .1 uh up to 200H.... which is good for old
chokes etc. The
875-B has front panel zero set adjustment, so you can zero out teat lead uh
/pf.
I would be screwed without the LCR meter, dead in the water. 95% of ham radio
/ hb linears is
uh/pf. I also use it to measure all stray pf and uh.
Later.... Jim VE7RF
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