We have a MSR2000 for our club repeater. Every so often on a weak signal we get
a noise that sounds like...well you know when you go to the dentist and get
your teeth cleaned. The little tube that they put in your mouth and sucks all
the spit out. Wel... that is on the tail of some
Sounds like intermod involving your repeater's transmitter as part of the
mix.
Chuck
WB2EDV
- Original Message -
From: Robert kd4...@juno.com
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, August 14, 2010 7:32 AM
Subject: [Repeater-Builder] Strange noise on our club repeater
Because the impedance is not matched between the transmitter
and duplexer, the 'apparent' loss of the duplexer is greater
than the manufacturers stated loss of the duplexer. Changing
the cable length is not changing the loss of the duplexer,
it's changing the power that is accepted at
FWIW,
TX/RX Systems talks about adverse length cable between the transmitter and
the duplexer in their technical papers.
Chuck
WB2EDV
- Original Message -
From: Jeff DePolo j...@broadsci.com
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, August 14, 2010 8:44 AM
Subject: RE:
On 8/14/2010 8:44 AM, Jeff DePolo wrote:
But if the duplexer is tuned to 50 ohms, and the cable is 50 ohms, varying
the cable length isn't going to change the Z seen by the transmitter. Or
are you suggesting the duplexer is purposely de-tuned from 50 ohms?
I use a Network Analyzer to tune
It appears to work too. I have to be honest it is very hard to see it at the
bottom of the messages. Maybe that could help it some to find it.
Kenneth Cook, W8DZN
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Richard
Sent:
Has anyone done any comparison testing between the HYT Repeater and The
Motorola Trbo repeater? I am particulary interested in making a future
purchase of either one. I have read about the IPsec concerns and that to me is
really not an issue. I am sure that HYT will address that concern as
Larry:
I am using a version 2 TKR 850 with an Angle Linear GAas Fet Pre-amp with a
bandpass cavity. Exc results without desense. The preamp is before the cavity.
As I agree with the other writers, you will need to retune the receiver for
optimum performance.
Invest in a Good Commercial
I think that stands out :D
Regards,
-Frank C.
On Aug 13, 2010, at 9:26 PM, Kenneth Cook wrote:
This is an experiment to see if I could make the link stand out. This is NOT
to start problems!
73…de Ken Cook, W8DZN
Switch to: Text-Only, Daily Digest • Unsubscribe • Terms of
oh i know that it wasnt sent from any of the computers that the YL or myself
use nor was it sent through the local networks both here and at my house. i am
of the belief that both of us were fished while on the laptop i bought for mom.
i thought i installed spybot SD but i guess not. as
Larry:
I am using a version 2 TKR 850 with an Angle Linear GAas Fet Pre-amp with a
bandpass cavity. Exc results without desense. The preamp is before the cavity.
As I agree with the other writers, you will need to retune the receiver for
optimum performance.
Invest in a Good Commercial
Your best bet is to setup your email to receive each post in digest form
meaning once a day on average you will receive a bunch of postings in just one
email into your inbox. When you get around to opening up your inbox you can
just scroll through each individual posting, read the ones that
Hi Artie,
Regardless of what make and model repeater equipment you
choose, be sure to actually check the receiver discriminator
output performance. I traced problems in a system running
LTR and DCS Data back to one model of lower priced desktop
repeater receiver. (also known as a two mobiles
--- In Repeater-Builder@yahoogroups.com, Jeff DePolo j...@... wrote:
c) Although not explictly described in GE's tuning procedures, significant
improvement in efficiency can be obtained with proper tuning of the
Z-matcher. Tuning for 50+j0 at the input to the Z-matcher is NOT
necessarily
You guys are silly...
Consider changing your group settings to read on the web
using a web browser. Then... simply locate the group with
your web browser bookmark anytime you want to read the group
posts.
No flood of inbound Emails for each post or large digest
Emails required. Probably
Jeff DePolo wrote:
Because the impedance is not matched between the transmitter
and duplexer, the 'apparent' loss of the duplexer is greater
than the manufacturers stated loss of the duplexer. Changing
the cable length is not changing the loss of the duplexer,
it's changing the power that is
HOLY CRAP I've been wondering that for some time. Guess the manual
isn't always right. and maybe that's why the GE Z-match is there for the
recruiting of true GE tuners.. Never-mind keeping your PA happy at 100%
DC. I always wanted to ask but never did (for thought of flames from the
GE
Kevin Custer wrote:
Joe Ham buys a new duplexer and hooks it up to his 110 Watt MASTR II
repeater and gets 50 watts out the antenna port. He does his homework
and realizes that he should only be loosing 29%
Wow -* loosing -* that should have been losing - that's what I get for
being in a
Kevin Custer wrote:
I had one instance of a ham radio club loosing PA's left and right on
their 2M machine.
Indeed - I am loosing my mind - grin
K
DB-420's are about as good as they get. I like the big blue Telewave's, but so
does lightening if you are on top of the tower.
- Original Message -
From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
To: Repeater-Builder@yahoogroups.com
Kevin,
Don't feel bad- look at the number of postings that use you instead of your,
your instead of you're, mhz instead of MHz, Khz instead of kHz, it's instead
of its... the list is endless!
But, back to the thread... it's refreshing to see that more than a few list
members know that a dummy
So will someone post a simple rule of thumb. If you have the option of
optimizing cable length from PA to first cavity, IE you haven't made
them yet what's the best simple rule of thumb to follow to build them
to avoid reactance. 1/2wl if allowed minus coupling loop depth? Or is
that past a simple
FORGOT to multiply cable VF then subtract coupling loop depth!!! Forgive
me :-)
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ross Johnson
Sent: Saturday, August 14, 2010 11:59 AM
To: Repeater-Builder@yahoogroups.com
I am subscribed to all of my groups in 'single e-mail' form. I have
configured Thunderbird to sort those groups into individual folders. By
doing this, I can look at things in a digest mode. If I want to get rid
of a bunch at one clip, I can select all and hit delete.
Just my 2c worth of
What link?
From: Richard gbis-reply-...@gbis.com
To: Repeater-Builder@yahoogroups.com
Sent: Fri, August 13, 2010 11:35:07 PM
Subject: RE: [Repeater-Builder] unsubscribe
Well, I think it's funny.
Richard, N7TGB
www.n7tgb.net
The problem with socialism is
That's because there are as many rules as there are thumbs. ;-)
I don't know about anyone else, but I can tell you about the highly
scientific method I use.
I start with a multiple of 1/2 electrical wavelength and trim as
necessary. I'd stay away from an odd-multiple of 1/4 wavelength in
Some related comments, if you don't mind.
Temperature changes seem to be the biggest detuner of largely
mechanical devices like cavity duplexers. We often send our repeaters
off to live in less-than-ideal environments, then expect cavity
input/output impedances to remain as we measured them
Um Ok, I want this gone. Tried swapping it, and selling it so how low do i have
to go before someone will bite.
not that i will necessarily let it go extremely cheap, but i am just curious
about how low i have to go to get it sold. also want to know the reasoning of
why it is so hard to get it
Here's an excerpt from a TX RX publication that ties in with this
discussion
Adverse cable length between Duplexer and transmitter using varactor or
broadband hybrid combining type
transmitter outputs. Even though the Duplexer VSWR is flat on frequency, the
reflected impedance of the
Duplexer
One correction here; the Bird power meter is not just a voltage measuring
meter. It does in fact measure voltage and current to calculate power. It
will give true power even if used in a non 50 ohm circuit. But you must
always subtract reflected power from indicated forward power to find true
The HYT repeater is actually a Proper repeater and has been designed around
the Spectra Engineering MX800
http://www.spectraeng.com.au/So if you are looking at implementing a DMR
repeater into a RF dense site, I'd definitely know which way I'd go. No
questions
Gareth Bennett
RadioSystems
On Aug 12, 2010, at 9:09 PM, Zephyr wrote:
Thanks for having me in your group. I am a long-time military veteran and a
paramedic. I hope to learn a lot from the group. One of the reasons I joined
the group is to find out what kind of EMP hardening is considered when
designing and building
On Aug 14, 2010, at 12:57 PM, Scott Zimmerman wrote:
I am subscribed to all of my groups in 'single e-mail' form. I have
configured Thunderbird to sort those groups into individual folders. By
doing this, I can look at things in a digest mode. If I want to get rid
of a bunch at one clip,
I'm the opposite. I want all my email dumped in one inbox. I'm afraid if it
gets sorted to different folders, something's bound to get missed. Just like
the mailman puts all my snail mail in one mailbox. Works just fine. Same
reason I prefer list servers to forums - I don't want to have to go
And I am one of those with separate folders for two reasons, first it
makes things easier to see, and I have never had a problem with getting
email mixed up, I subscribe to multiple yahoo groups and each one has
its own folder which makes it easy to see when there is new email from
each group.
what is the input power on the 200 watt Vocom amp?
K+John
- Original Message -
From: n2len
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, August 14, 2010 9:24 PM
Subject: [Repeater-Builder] Repeater Stuff For Sale!
Motorola RKR-1225 VHF Repeater with Rack
Russ Hines wrote:
Some related comments, if you don't mind.
Temperature changes seem to be the biggest detuner of largely
mechanical devices like cavity duplexers. We often send our repeaters
off to live in less-than-ideal environments, then expect cavity
input/output impedances to remain
Sid, I think I found your formula. Look on page 62 of:
http://www.repeater-builder.com/antenna/pdf/ve2azx-duplexerinfo.pdf
BTW, my guess was wrong. Length is expressed in inches.
73, Russ WB8ZCC
On 8/13/2010 1:44 PM, Russ Hines wrote:
Hmm, the formula is a bit off, but... 30 x 32.785 =
Ross Johnson wrote:
So will someone post a simple rule of thumb... If you have the option
of optimizing cable length from PA to first cavity, IE you haven't
made them yet what's the best simple rule of thumb to follow to
build them to avoid reactance. 1/2wl if allowed minus coupling loop
Jeff, you aren't stepping on my toes at all. Glad to see your
comments.
OK, good. Since you've never met me, I can assure you, you definately DO
NOT want me stepping on your toes, it would be painful.
I do have to agree with Kevin that most duplexer
manufacturers recommend different cable
So will someone post a simple rule of thumb. If you have the
option of optimizing cable length from PA to first cavity, IE
you haven't made them yet what's the best simple rule of
thumb to follow to build them to avoid reactance. 1/2wl if
allowed minus coupling loop depth? Or is that past
OK, I think, for the most part, we're on the same page. I'm cuttin' and
trimmin' a lot here...
And this is where I believe the duplexer manufacturers are
covering their butt. They don't want the problem with
complex reactance presented by the duplexer to be their
problem. Not that I
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
buil...@yahoogroups.com] On Behalf Of Jeff DePolo
Sent: Saturday, August 14, 2010 10:45 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Coax length, etc.
Jeff, you aren't
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