We have used a similar, and unique way of linking multiple sites here in NZ,
Utilising four sites and multiple CTCSS, We utilise One repeater per site,
Vertex Standard VXR-9000, programmed to scan all four frequencies (That site
repeater input frequency, and the other three repeater sites output (TX)
frequencies.
Once valid activity has been detected, TX is on the single allocated frequency
for that site location.
The VXR-9000 has a tone panel integral to the repeater, so can decode/encode 16
CTCSS or DCS codes.
Needless to say frequency co-ordination is very important, as each repeater
site is also listening on the output frequencies as well. To make this work for
our client, separate TX and RX antennas were required, as well as some clever
filter engineering.
What I am saying is that a repeater that has multiple channels, and that can
also scan, can replace your link receiver in some instances.
All the best for 08'
Cheers
_________________________________________________________________
Gareth Bennett
This email is confidential, if you received this message in error, or you
are not the intended recipient,
please return it to the sender and destroy any copies.
Thank you.
----- Original Message -----
From: Kerincom
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, January 05, 2008 5:04 PM
Subject: Re: [Repeater-Builder] Linking two shared repeaters
Each of my repeaters operate on different frequencies .e.g. Repeater #1
rx 483.9mhz and TX on 489.1mhz 5.2 meg split.
#2 may be on rx 490mhz and TX on 495.2mhz
Correction my #2 repeater link receiver is tuned to #1 output frequency
(489.1mhz) .and transmitt on the #1 input frequency (483.9mhz).
Yes each on my clients on the private have a separate ctcss frequency
assigned to their radios for TX and rx so they can only hear their own cars.
Thank You,
Ian Wells,
Kerinvale Comaudio,
361 Camboon Road.Biloela.4715
www.kerinvalecomaudio.com.au
-------Original Message-------
From: Jim Brown
Date: 5/01/2008 12:36:06 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Linking two shared repeaters
I think I understand what you are saying Ian. Your
#2 repeater has it's input frequency on the #1
repeater's output frequency. That way you would only
require one extra receiver (on a third frequency) and
precedence circuit at the #1 repeater site. The #2
site would have to have it's output on the third
frequency to make it all work.
I think you have simplified the system down to the
minimum required hardware to make it work. CTCSS
Transmitted only while an input is present would round
out the system requirement. Your multi-user CTCSS
controllers should keep things private as different
users use the different tones.
Sometimes thinking outside the box can make for a real
worthwhile reduction in hardware.
73- Jim W5ZIT
--- Kerincom <[EMAIL PROTECTED]> wrote:
> Hi again Jim
> With your thinking below .My remote private site
> should work in the same
> sort of way as what you are suggesting except while
> s2 has a signal on it
> it sends this signal to both s2 users and back to s1
> repeater at the same
> time.In return the signal works the same as your
> first 3-5 lines below.I
> only require one link radio on the remote sites and
> not one at each end of
> the link .However with our open we have a separate
> link repeater paired with
> the s1 (explained better in my response to skip) so
> the link system works at
> the same time as the central site repeater.In the
> open system we don't link
> the TX frequencies directly from site to site
> .I.e.(s1tx to s2rx)(s2tx to
> s1rx) due to a error in frequency allocation,which
> will be fixed and which
> we expect to link directly with our private system
> as we wont get the sites
> frequencies licensed so close together next time
>
> Thank You,
> Ian Wells,
> Kerinvale Comaudio,
> 361 Camboon Road.Biloela.4715
> www.kerinvalecomaudio.com.au
>
> -------Original Message-------
>
> From: Jim Brown
> Date: 4/01/2008 8:25:48 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Linking two shared
> repeaters
>
> Ian, here is my thinking. When site 1 has a signal
> on
> the repeater input, the signal from site 2 is
> blocked
> because of the circuit that gives precedence to the
> local site repeater receiver. When a site 1 user
> unkeys, there will be no CTCSS tone coming back from
> site 2 to key the site 1 repeater. The combination
> of
> the precedence circuit and CTCSS requirement for
> both
> repeaters keeps the system from locking up. The same
> circuit would be required between the receivers at
> site 2 as in site 1. And both repeaters would have
> to
> be configured to only transmit a CTCSS tone when a
> user keys the input, not during the squelch tail.
>
> 73 - Jim W5ZIT
>
> --- Kerincom <[EMAIL PROTECTED]> wrote:
>
> > I will have a look at the circuit and see .The
> > problem we found with link
> > setup 1 upper design is we could not have one link
> > radio on one site and one
> > on another site as when the site 2 link stops
> > transmitting and rx site 1
> > tail retrips site 2 and keeps them on .Another
> > problem was while s1 link in
> > transmitting s2 receiver is trying to pick up the
> > incoming signal and s1
> > link transmission at the same time .
__________________________________________________________
Never miss a thing. Make Yahoo your home page.
http://www.yahoo.com/r/hs
