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klehman(at)albedo.net
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 Posted: Sun Jul 16, 2006 4:09 am Post subject: Help needed: continued strobe noise & weak |
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Hi Barry
My references indicate that RG-400 and RG-58 are both 50 ohm coax and
that RG-400 is lower loss and preferable ??
Ken
snip
| Quote: | As for the COAX, RG-400 is 75 ohm impeadance cable it is also a quad shield
cable a VERY good cable but not suited for our needs. We should be using RG-58
or RG-58A/U. It works for us very well. Oh, notice I used the term
IMPEDANCE. This is an AC resistance and is NOT measured with an OHM Meter.
Concerning the RG-800 .... I am not familiar with it. RG-58 is what you need
to use.
As for the Radio Shack (Real $hit) pre-made COAX stay away from it. I have
seen so many problems in their assembly, wrong coax, poor connections and
CRIMPS! You do not want a crimped coax.
NO self-respecting RF Man will accept a CRIMPED coax.
Barry
"Chop'd Liver"
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Earl_Schroeder(at)juno.co
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| Posted: Wed Jul 19, 2006 11:35 am Post subject: Help needed: continued strobe noise & weak |
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I too would use a 'one page' summary of the 'ground' information. Bob's
book is good but like Jerry said, "this stuff scattered'. Thanks, Earl
Brian Lloyd wrote:
| Quote: |
<brian-yak(at)lloyd.com>
On Jul 19, 2006, at 1:07 PM, Jerry Grimmonpre wrote:
>
> <jerry(at)mc.net>
>
> Brian ...
> Your work on this subject has produced excellent information and
> understanding. Your knowledge and genius are all telling. Is it now
> possible you could boil all this down, into one simple, short,
> document? Something we could post on our shop wall for quick
> reference. A single piece of paper as to what's twisted, what's
> grounded and where, what's grounded on one end and where and the
> other do's and don'ts? I've seen this stuff scattered all over the
> electric list but I think it would help everyone to have a
> consolidated list. Would you please consider doing this for the list?
> Many thanks ...
Huh. Interesting idea. Isn't there a chapter in the Aeroelectric
Connection that covers this? It has been a long time since I read
Bob's book but it struck me as a pretty good primer on this stuff.
Regardless, if it seems like a one-pager would be good to have around
I will try to generate one. Bob's book is clearly the seminal work on
the power wiring for an airplane. My experience is a bit more toward
audio and RF.
But right now I have to fix two bilge pumps. <sigh> The only place
nastier than the bilge on a boat is perhaps a septic tank.
Brian Lloyd 361 Catterline Way
brian-yak AT lloyd DOT com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
http://www.matronics.com/Navigator?AeroElectric-List
http://wiki.matronics.com
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