-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Nate Duehr
I'm curious to see if:
1. You're seeing the majority of failures in PA's.
2. If you're seeing other failures of some sort. (That would be odd to me,
at least from our
Anyone know the answer to the original question.
How do you make sure you have enough high level, function, and low level
guard tones at the repeater input?
The way I see it you have the keyer output into the phone line to make your
initial adjustment. Then the repeater has a line input as
Two different answers about allowable loss. My line meter is marked in
green for 16db, and I always heard that was reliable loss from end to end.
So, what Steve is saying is if the line is flat, then setting for -10dbm @
1000hz for 3khz deviation and all the rest will line up fine at the
I currently have at work, an Motorola R2600 service monitor.
I need to upgrade to one that will work with Motorola VRM's like the VRM600
and 850's using the RDLAP, or whatever it is...
Anyway, I would assume I would go with the next service monitor up that has
the stuff I need. I know they are
Thanks Eric for the nice detailed message. Gives me a good place to begin.
-Tim
www.ldservice.com/tim/tim
Eric Lemmon [EMAIL PROTECTED] wrote:
__
Tim,
My preference is a matched pair of coaxial cables, 1 meter long, made
with RG-400/U (not RG-142/U!) double-shielded cable. Each end to
Your overkill may have saved me a couple of hours today.
When I was working with my repeater I thought I had a big loss through the
duplexer. It turned out it was my substandard cables. Then it was a bigger
bear trying to tune it back after I messed with it.
I'm not sure what kind of cables
Go for it. I built my first repeater using moxys. It worked well and sounded
good.
It's a great learning experience. Get in there and tinker around and figure
stuff out. That's what ameatur radio is all about.
-Tim
kb9qbt wrote:
To the group,
This is my first post but have been a
This is a little off topic but I could use some help.
I am working on a fire truck that is getting interferrence on the VHF
(156.075mhz) from the trucks wiring.
If I put an HT near I get the interferrence on the HT. When I disconnect the
battery it goes away.
We removed one fuse at a time
I replied direct about the TM-7VA and got no response either.
:
.
www.ldservice.com/tim/tim
Dave [EMAIL PROTECTED] wrote:
__
I emailed him off list wanting the 742 but he's never replied
Doug Strobel-kb3ham [EMAIL PROTECTED] wrote: rus if i were you i would
email nick off
Is there a radio repair list like this one is for repeaters?
A lot of radios have the same kind of breakdowns over and over again, so it
would be nice to have a list to discuss them.
Just wondering.
-Tim
Yahoo! Groups Links
* To visit your group on the web, go to:
Thanks to all the help here and repeater-builder.com I got it figured out.
Quite interesting actually.
I verified the input to the duplexer had 42 watts by using a coupler on the
duplexer input cable and hooking it up to my service monitor.
And hooked it all back up and I had 42 watts into the
] Duplexer story update
In order to do a meaningful calculation, I would have to know the type of
dielectric in the coax to determine the velocity factor. The VF will be
less than one.
73
Glenn
WB4UIV
At 07:36 PM 10/01/04, Tim S. wrote:
Thanks to all the help here and repeater-builder.com I got
That is interesting that both you and Coy mentioned the z-matcher.
I have never heard of one. I will be looking into it for the sake of
knowledge enrichment ;-)
I assumed that the input cable length from the pa to the duplexer did not
matter and that I hit some kind of magic wavelength length
-Original Message-
From: Thomas Oliver [mailto:[EMAIL PROTECTED]
I like to tune the duplexer with service monitor for best peak and notch
like you did then hook up repeater and check reflected power at
transmitter
output as you did and compare foreward and reflected readings with
So from what I am getting here.
Only some PA's are affected by the cable length. Mine happens to be a
Master II Tband. It's only trial and error to discover it the problem. It's
trial and error to make the cable length right so the PA is happy.
If I understand this right, what cause the
. Although the length of the
cable is certainly a factor, you should also check to be
certain that the cable is not defective.
What would be the best way to check the cable for not being defective?
I checked the output directly off the PA and then through the cable and it
was the same.
10:07 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexer story update
Tim S. wrote:
So from what I am getting here.
Only some PA's are affected by the cable length. Mine happens to be a
Master II Tband. It's only trial and error to discover it the problem
As I stated a few times here I have a duplexer that has been giving me
desense. To get rid of the desense I turned down the TX power until it went
away because the duplexer is rusty and hasn't been messed with in 20+ years.
I came across another duplexer in a base station cabinet we had and
Comments within...
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Tim, a couple of questions come to mind.
1.) Are you trying to tune a T-band Duplexer down to
440? Not reccomended.
No I am not trying to make it go to ham band. I maintain a private tband
-Original Message-
From: Paul Kelley [mailto:[EMAIL PROTECTED]
What is the SWR looking into the duplexer?
Did not check that. What should it be? I assume 10% or less reflected.
Have you tried
different length cables from the transmitter to the
duplexer and looked to see if the power
Thanks Joe.
I'll check that out.
-Tim
-Original Message-
From: mch [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 30, 2004 10:44 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] The duplexer story...
Tim S. wrote:
-Original Message-
From: Paul
Thanks Jim. Great explanation.
-Tim
-Original Message-
From: Jim B. [mailto:[EMAIL PROTECTED]
Leave the tone turned off first.
If you have any way to put a local mic on the tx, or generate audio
DIRECTLY into the mic input, set the deviation on the transmitter for
maximum
What's the best way to adjust the transmit deviation for a repeater.
I was thinking of doing it this way.
Setup the service monitor for duplex mode and hook the cable up to the
antenna port on the duplexer.
Manually key the transmitter and adjust the PL for .6 kHz deviation.
Then adjust the
Thanks for the information Eric.
Really clears things up well.
-Tim
www.ldservice.com/tim/tim
-Original Message-
From: Eric Lemmon [mailto:[EMAIL PROTECTED]
Sent: Monday, September 20, 2004 6:39 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] detuned duplexer
Mike,
I used to get mine done here:
Silverado Avionics
(707) 255-5588
2500 Airport Rd
Napa, CA 94558
-Tim
www.ldservice.com/tim/tim
-Original Message-
From: Mike Perryman [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 21, 2004 8:34 AM
To: Repeater-Builder@yahoogroups.com
Pretty sure I know the answer to this.
But can a transmitter keying into a duplexer that's detuned cause intermod
interference?
I have a transmitter that I turned down the power because it had desense on
it. Turning the power down fixed the desense but now I am wondering since
its still
, 2004 8:14 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: detuned duplexer cause intermod?
Tim S. [EMAIL PROTECTED] wrote:
Pretty sure I know the answer to this.
But can a transmitter keying into a
duplexer that's detuned cause intermod
interference?
big time
Will do!
Thanks for the input.
-Tim
www.ldservice.com/tim/tim
-Original Message-
From: Tony lelieveld [mailto:[EMAIL PROTECTED]
Sent: Monday, September 20, 2004 2:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: detuned duplexer cause intermod?
Tim S
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