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Re: AO-40 Test 05/08 (long)



It does depend on the output device but a 25-ohm load will require more
current to acheive the same output voltage and any bandpass filters on the
receiver inputs will not see 50-ohms so the responses will be altered.

73,

John
KD6OZH

----- Original Message -----
From: "Pieter Ibelings" <elpieter@hotmail.com>
To: "Douglas Cole" <n7bfs@qwest.net>; "John Stephensen, KD6OZH"
<kd6ozh@AMSAT.Org>
Cc: <amsat-bb@AMSAT.Org>
Sent: Thursday, 10 May 2001 02:49 UTC
Subject: Re: [amsat-bb] AO-40 Test 05/08 (long)


> Not necessarily but it can. It really depends on the device at the output
of
> the converter.
>
>
> if you have two 50 ohm feeds on a T then the impedance can drop to 25.
> That's a 2:1 SWR. big deal!
>
> The mmic's used in most of those converters can be worse than that and
they
> could be 100 ohms also.
>
> Pieter
>
>
> ----- Original Message -----
> From: "Douglas Cole" <n7bfs@qwest.net>
> To: "John Stephensen, KD6OZH" <kd6ozh@AMSAT.Org>
> Cc: <amsat-bb@AMSAT.Org>
> Sent: Wednesday, May 09, 2001 22:25
> Subject: Re: [amsat-bb] AO-40 Test 05/08 (long)
>
>
> > "John Stephensen, KD6OZH" wrote:
> > >
> > > A power divider will work better as it presents a 50-ohm load at the
> > > converter and therefore doesn't degrade the converter output intercept
> > > point. Minicircuits power dividers are often available at swapmeets
for
> > > $5-10.
> > >
> >
> >
> > Ahh , so the impedance imbalance would cause a change in the output
> > intercept point eh?
> >
> > I like it , so using a plain old tee is not a good idea , hey , its not
> > that hard to build a 6db 50ohm splitter .....
> >
> > tnx John for the input , I knew I was missing something of value ....
> >
> > --
> > Douglas Cole   N7BFS
> > AMSAT#26182 , K2 # 544
> > http://www.users.qwest.net/~cdoug3
> > Registered Linux user # 188922
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >

----
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