There will be some reflected power from the antenna. And this reflected power
will be wide tx band noise also which will affect the receiver.
If you are putting power into the isolator tx port there will be reflected
noise and 30 db will not be enough. With the TX -80 db down and 30 db from
An isolator is linear except with frequency just as a cap or inductor or
feedline are. What's in an isolator that is non-linear. It is made of
transmission lines, no active components...what is non-linear. You put in x
power, you get x-loss out until x becomes to large then you get smoke
??
_
From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of
Ron Wright
Sent: Tuesday, October 23, 2007 6:31 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and reciever
noise bud
Total isolation = 97 to 127db (as good or better than most
stock duplexer setups)
That's for carrier attenuation only. Aside from the passive losses in the
system, you've done nothing to attenuate transmitter noise, which is going
to be a bigger enemy in your close-spaced frequency
An isolator is linear except with frequency just as a cap or
inductor or feedline are.
No, it's not linear. First off, it doesn't satisfy the superposition
principle since it will produce harmonic when fed by a pure sinusoid carrier
(hopefully we can agree to that without added discussion),
Not sure why isolator cause harmonics for it has no
non-linear components. It might cause tx to generate
harmonics. Isolators are on the output of many repeater
transmitters including my UHF Micor and it is built to work
directly into an antenna although most applications use a
duplexer
: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jeff DePolo
Sent: Tuesday, October 23, 2007 12:05 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and
reciever noise bud
Total isolation = 97 to 127db (as good
: John Barrett
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, October 23, 2007 11:39 AM
Subject: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and
reciever noise bud
I’m trying to understand your figures, and I got lost some place.
From the transmitters… I’m max 50w
- Original Message -
From: John Barrett mailto:[EMAIL PROTECTED]
To: Repeater-Builder@ mailto:Repeater-Builder@yahoogroups.com yahoogroups.com
Sent: Tuesday, October 23, 2007 11:39 AM
Subject: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and reciever
noise bud
I’m trying
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