Re: [Repeater-Builder] Antenna separation for UHF repeater operation

2009-05-31 Thread wa2ar 
20ft. Vertical separation assuming vertically polarized omni antennas are used.

Alan
Sent from my Verizon Wireless BlackBerry

-Original Message-
From: Aisen Lopez 

Date: Sun, 31 May 2009 18:16:14 
To: 
Subject: [Repeater-Builder] Antenna separation for UHF repeater operation


Hello:

I realize this question must be "old boring stuff" nonetheless I will ask it.  
I'm planning on installing a GMRS repeater and I would like to use two antennas 
instead of a Duplexer/Antenna combination.  What would be a good separation 
distance for a standard Split of 5 MHZ, two 5 dB antennas an 35 Watts of power?.

Thanks in advance...

RE: [Repeater-Builder] Antenna separation for UHF repeater operation

2009-05-31 Thread Eric Lemmon 
If we assume that both antennas are identical and mounted inline and
directly one above the other, and assuming a receiver sensitivity of 0.25
uV, a vertical spacing of 39 feet should provide sufficient isolation
between RX and TX.  This assumes solid-shield RX feedline, such as Heliax,
with the RX antenna at the top.  Obviously, more separation is better.

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Aisen Lopez
Sent: Sunday, May 31, 2009 6:16 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Antenna separation for UHF repeater operation



Hello:

I realize this question must be "old boring stuff" nonetheless I will ask
it.  I'm planning on installing a GMRS repeater and I would like to use two
antennas instead of a Duplexer/Antenna combination.  What would be a good
separation distance for a standard Split of 5 MHz, two 5 dB antennas and 35
Watts of power?.

Thanks in advance..