Repeater Builders,
I pose to you all a question. I have two UHF duplexers, both 4 cavity
pass-reject. One is a Wacom (the ubiquitous 3U rackmount guy) and the
other is from a Motorola MSR2000. I have really poor equipment, and
don't necessarily "trust" manufacturer specs. Anybody have an opi
Looking for factory alignment for the following
Telwave TPRD 1554
Wacom WP655-R2
Ralph, W7HSG
--- Begin Message ---
Check out COMTELCO antennas, they
are on the web at www.comtelcoantennas.com I have
many of them in service with 100% results. They are equa
I wish to take an interest at American HAM's how much actually now to
sell new duplexers in the USA. My company makes antennas and duplexers
for a professional radio communication. Your opinion interests, I was
not late for 20 years?)
Evgeny, IK-Telecom
Anyone one know what to expect SWR wise with a duplexer?
I have a DB products 2 meter duplexer on an amateur repeater.
Measuring with a Bird wattmeter between the duplexer and antenna I
read 50W forward and a couple watts reverse. That is ok. But when I
check between the transmitter and the TX port
I am having some receive problems on my repeater and I am
thinking that it might be desense. I am on 2M running a
MASRII repeater with a Decibal Products band reject 6 can
duplexer.
While I can key the repeater from a pretty good distance
the audio that makes it through the repeater drops off
Is it OK to get some kind of storage container or something like that and
put my duplexer outside? What would be the risks of doing so? I am in
Florida so lots of rain and heat but no freezing months or anything like
that?
Thanks,
Vern
KI4ONW
has anyone or does anyone know where tofind the math formulas to help you
design a set of cavities for a duplexer? I have been looking on the web and
in the arrl handbook and the big book of antennas, and todate I have found
plans for 2 meter duplexers.
I have yet to find any place where they show
Title: Duplexers
Hey guys and gals.
First time poster here.
Just wondering if anyone has a set of duplexers with notch for 2M that they have hanging around and would like to get rid of?
Please let me know directly @ [EMAIL PROTECTED]
I really do appreciate it.
Thanks
Harold
kb7rsi
Las Vega
Dave;
Sorry about that. The two meter one is a 28-37-02 and
the specifications are:
Frequency Range
:
144-174 MHz
Minimum T-R Separation
:
0.5 MHz
Tx Insertion Loss
:
1.5 dB
Rx
Our club was recently given a 220 repeater. We have two seperate antennas. We
do not have a duplexer. My question is do we have to have a duplexer? How can
we keep the transmitter from desensitizing the receiver? The antennas are apart
but can be moved farther.
Thanks
Chris
Kg4bek
any way to tune duplexers without a scope or monitor ?
Bobby/N2BR
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: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Duplexers
Looking for factory alignment for the following
Telwave TPRD 1554
Wacom WP655-R2
Ralph, W7HSG
Are you seeking U.S. distribution?
Please contact [EMAIL PROTECTED] directly.
Thanks
ua3ahm <[EMAIL PROTECTED]> wrote: I wish to take
an interest at American HAM's how much actually now to
sell new duplexers in the USA. My company makes antennas and duplexers
fo
hi all
i have 3 little duplexers
sinclair sd-220
rx 152.660
tx 157.950
if someone is interested send me an email direct please
73/s
make me an offer will see,i dont need them as their GE radio connected
too.
gervais ve2ckn
Generally the duplexer only makes a slight contribution to the reflected
power. How doe the reflected power between the transmitter and antenna,
without the duplexer in line look? Steve NU5D
dallasreact112 wrote:
> Anyone one know what to expect SWR wise with a duplexer?
> I have a DB products
If the duplexer is correctly tuned, there will be NO measurable SWR into it. If
you have 25/60 watts, it is way off frequency.
- Original Message -
From: dallasreact112
To: Repeater-Builder@yahoogroups.com
Sent: Friday, August 24, 2007 7:16 PM
Subject: [Repeater-Builder
>From the Dup. to the Ant. is ok. But the Dup. is out of tune or no good. Might
>even be a bad jumper on the Dup.
dallasreact112 <[EMAIL PROTECTED]> wrote: Anyone one know what to expect SWR
wise with a duplexer?
I have a DB products 2 meter duplexer on an amateur repeater.
Measuring with a Bi
epeater-Builder@yahoogroups.com
>Subject: [Repeater-Builder] Duplexers
>
>Anyone one know what to expect SWR wise with a duplexer?
>I have a DB products 2 meter duplexer on an amateur repeater.
>Measuring with a Bird wattmeter between the duplexer and antenna I
>read 50W f
hould see about 59 watts going to
the antenna.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of dallasreact112
Sent: Friday, August 24, 2007 5:16 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Bu
--- Eric Lemmon <[EMAIL PROTECTED]> wrote:
> Bernie,
>
> When you put the Bird between the TX and the
> duplexer, you have changed the
> length of the jumper cable, which upset the tuning.
> But, really, you need
> not worry about what the SWR is, if the forward
> power to the antenna is
> appr
> When you put the Bird between the TX and the duplexer, you
> have changed the
> length of the jumper cable, which upset the tuning.
Adding a wattmeter or any other length of cable between the transmitter and
the duplexer Tx input port has no effect on the tuning of the duplexer. It
may chang
--Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jeff DePolo
Sent: Friday, August 24, 2007 9:30 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Duplexers
> When you put the Bird between the TX and the duplexer, you
>
--- Jeff DePolo <[EMAIL PROTECTED]> wrote:
> > When you put the Bird between the TX and the
> duplexer, you
> > have changed the
> > length of the jumper cable, which upset the
> tuning.
>
> Adding a wattmeter or any other length of cable
> between the transmitter and
> the duplexer Tx input
Ya you should be able to trim your coax so the transmitter "sees" 50 ohms,
which should be every 1/2 wave. All this does it protect the transmitter,
the standing waves are still there, they just gets dissipated/radiated by
the coax.
Also with cans usually, if I have enough time on my hands, I tun
> Ya you should be able to trim your coax so the transmitter
> "sees" 50 ohms, which should be every 1/2 wave. All this
> does it protect the transmitter, the standing waves are still
> there, they just gets dissipated/radiated by the coax.
No, no, no, no, no (thumping head on desk).
If the V
> Jeff you have just made two statements that are the
> exect opposit of each other. If changing the length
> of cable makes a differance, then the swr as seen by
> the transmitter must change.
Re-read what I said. Changing the cable length changes the *Z*, but it
doesn't change the *VSWR*. As
12:30 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Duplexers
> When you put the Bird between the TX and the duplexer, you
> have changed the
> length of the jumper cable, which upset the tuning.
Adding a wattmeter or any other length of cable between the tr
n Behalf Of *Jeff DePolo
> *Sent:* Saturday, August 25, 2007 12:30 AM
> *To:* Repeater-Builder@yahoogroups.com
> *Subject:* RE: [Repeater-Builder] Duplexers
>
>
>
> > When you put the Bird between the TX and the duplexer, you
> > have changed the
> > length of
One can also use 1/4- and 1/2- λ stubs of coaxial cable of the same
impedance as matching networks in conjunction with a "Tee" connector.
"Shorting" or "Opening" the end of the matching stub also makes a
difference, based upon the length being employed.
I believe that VSWR is *one* reason that cab
Sent: Monday, August 27, 2007 12:48 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexers
The length of coax doesn't effect impedance. Trimming the coax effects what
is read on the VSWR meter because what is actually happening is that there
is an interference pa
Lloyd
Sent: Monday, August 27, 2007 12:48 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexers
The length of coax doesn't effect impedance. Trimming the coax effects what
is read on the VSWR meter because what is actually happening is that there
is an interference pattern
> The length of coax doesn't effect impedance.
That statement is misleading, if not totally wrong. If there is anything
other than a perfect match at the load (in other words, if the VSWR on the
line is not a perfect 1:1), the coax behaves as a transformer. The
resulting Z, as measured at the
> I have heard this point argued for years. "Does trimming the
> coax affect the SWR?"
The answer is NO!!
> If the length of coax has an affect on
> impedance, then how could it not affect power out?
Changing the length of the line changes IMPEDANCE at the source end
(assuming the VSWR
As a side note for this discussion, I think Jeff's doing a great job of
explaining how transmission line theory works...
For those that want to dive in a lot further (e.g. Do the math), the
ARRL Antenna Book has a whole section dedicated to this topic, and it's
written well enough that a mathem
> As a side note for this discussion, I think Jeff's doing a
> great job of
> explaining how transmission line theory works...
I try...
> For those that want to dive in a lot further (e.g. Do the math), the
> ARRL Antenna Book has a whole section dedicated to this
> topic, and it's
> writte
ugust 27, 2007 11:48 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexers
The length of coax doesn't effect impedance. Trimming the coax effects what
is read on the VSWR meter because what is actually happening is that there
is an interference pattern created
gt;
> 73
>
> Gary K4FMX
>
>
>
>
> --
>
> *From:* Repeater-Builder@yahoogroups.com [mailto:
> [EMAIL PROTECTED] *On Behalf Of *Jesse Lloyd
> *Sent:* Monday, August 27, 2007 11:48 AM
> *To:* Repeater-Builder@yahoogroups.com
> *Subject:*
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jesse Lloyd
Sent: Monday, August 27, 2007 9:39 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexers
If your coax is the same impedance as your transmitter, but different
> If your coax is the same impedance as your transmitter, but
> different than your load, can it still be a transformer
> though?
It will ALWAYS act as a transformer when the cable's Z does not match the
LOAD Z. The SOURCE device (transmitter) plays NO part in the transformation
that happens.
Jeff DePolo wrote:
> NO. VSWR on a transmission line doesn't directly manifest as "heat" in a
> transmitter. The whole notion of high VSWR creating heat in a transmitter
> is likely based on a drop in efficiency in SOME transmitters when they are
> not properly matched to the feedline.
Or wor
At 8/27/2007 20:52, you wrote:
>Yes your right VSWR is the ratio between Vmax and Vmin, node and anodes,
>of the interference pattern caused by standing waves. Even still there is
>a point where the voltage is at a minimum on the line. What happens if
>that point is at the transmitters output
> >It doesn t matter where the min and max are on the line. The
> same amount
> >of reflected power will be seen at any point. Reflected
> power does NOT get
> >back into the transmitter. It gets re-reflected back towards
> the antenna
> >when it reaches the transmitter circuits.
>
> I don't
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Tuesday, August 28, 2007 10:54 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] Duplexers
>
>
At 8/29/2007 06:40 PM, you wrote:
> > >If you have two watt meters and an antenna matching device you can put
> > one
> > >wattmeter between the transmitter and the matching device and tune it for
> > >minimum reflected power on the first meter. Then with a second meter
> > >between the tuner and
> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Bob Dengler
> Sent: Thursday, August 30, 2007 12:53 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] Duplexers
>
> At 8/29/
>
>Adding or removing cable lengths between the transmitter and duplexer also
>does not change the VSWR as seen by the transmitter (minimal cable loss
>effects notwithstanding).
>
> --- Jeff
>
>
>
True but only if everything (tx out, cable and duplexer) is
be a cable problem.
Milt
N3LTQ
- Original Message -
From: "Eric Lemmon" <[EMAIL PROTECTED]>
To:
Sent: Saturday, August 25, 2007 1:38 AM
Subject: RE: [Repeater-Builder] Duplexers
> My statement regarding "tuning" did not explicitly refer to the actual
> t
> >Adding or removing cable lengths between the transmitter and
> duplexer also
> >does not change the VSWR as seen by the transmitter (minimal
> cable loss
> >effects notwithstanding).
> >
> > --- Jeff
> True but only if everything (tx out, cable and duplex
Time for an isolated TEE test with a dummy load. Why did you have the
duplexers tuned ? Was there a problem prior?
You should be able to split the duplexer without any trouble - just mark
things so you can go back as it was.
Best luck and 73, Steve NU5D
[EMAIL PROTECTED] wrote:
> I am having
I would be quite surprised if you are NOT having desense with a Mastr
II and a 6 can notch only duplexer at 600 khz
Typically a 6 can reject only duplexer is not sufficient isolation at
600khz for 2 meters with a solid state PA.. Vertical separation or a
pass/reject duplexer will be needed.
I had them tuned because I had just bought them and didn't
really trust that they were right. They were very far out
so it's good that I got them tuned. I was having the same
problem as now though very poor receive. Right now I have
a radio on there for receive that was getting about 30
mil
al Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, September 24, 2007 7:02 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Duplexers
I am having some receive problems on my repeater and I am
thinking tha
Decibel did make a 6 cavity notch duplexer - 4" full sized cavities -
that would work nicely on a 110 Watt M2 station @ 600 kHz. Isolated
TEE test into a dummy load - how bad is the receiver desense ? If you
don't have some test equipment - signal gen, dummy load, and a TEE
fitting with the sid
Our local club recently installed a 2 meter repeater on a water tank adjacent
to a cell site. Two cell towers are serviced by four buildings housing
equipement, and we are having some desense due to noise pickup on the antenna.
Running an iso-tee we found that our GE Mastr II receiver with GE
The duplexer is a DB-4048.
I have had this repeater for a couple of months and it has
always had problems. I don't have access to a service
monitor or anything like that right now but I have a
friend that has one however someone is borrowing it right
now.
From what I can tell the desense is
Of Jim Brown
Sent: Tuesday, September 25, 2007 8:20 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexers
Our local club recently installed a 2 meter repeater on a water tank
adjacent to a cell site. Two cell towers are serviced by four buildings
housing equipement
At 9/25/2007 05:20, you wrote:
>Our local club recently installed a 2 meter repeater on a water tank
>adjacent to a cell site. Two cell towers are serviced by four buildings
>housing equipement, and we are having some desense due to noise pickup on
>the antenna. Running an iso-tee we found th
>The noise floor is really decreasing the utility of the new
>repeater. The noise source seems to come and go as a quiet signal
>on the repeater input can become suddenly noisey, and vice versa - a
>noisey signal can become suddenly quiet.
It looks like you have a 10dB degradation. Many time
The 10dBd Yagi I mentioned is for 900MHz, something smaller would
have to be used for VHF :)
73,
Mark N5RFX
At 9/25/2007 07:59, you wrote:
> >The noise floor is really decreasing the utility of the new
> >repeater. The noise source seems to come and go as a quiet signal
> >on the repeater input can become suddenly noisey, and vice versa - a
> >noisey signal can become suddenly quiet.
>
>It looks like y
[EMAIL PROTECTED] wrote:
> I had them tuned because I had just bought them and didn't
> really trust that they were right. They were very far out
> so it's good that I got them tuned. I was having the same
> problem as now though very poor receive. Right now I have
> a radio on there for rec
Thanks for the great info as soon as we get the service
monitor back we are going to try these things.
I have already seperated the 2 sides and have seen much
improvement so I think that this is really my problem.
I do have a question about duplexers in general. I am
sure that this is a dumb
A transmitter may have broadband noise with considerable noise content
at the receive frequency. The notch in the transmit side removes
transmitter noise that may impair your receiver's capability. In an
earlier post there was mention of a solid state transmitter.
Traditionally tube transmit
At 11:12 AM 9/26/2007, Steve wrote:
>A transmitter may have broadband noise with considerable noise content
>at the receive frequency. The notch in the transmit side removes
>transmitter noise that may impair your receiver's capability.
In my day job 99% of the problems I have with noise floor is
This makes sense.
I guess what might help is to find a single VHF bandpass
can to put in front of the receive side of the duplexer.
How much does the power output effect the required filter
attinuation? Right now I am running about 70w out would
turning it down make much of a difference? Fro
is all relative.
--- On Mon, 10/27/08, Mung Bungholio <[EMAIL PROTECTED]> wrote:
From: Mung Bungholio <[EMAIL PROTECTED]>
Subject: [Repeater-Builder] Duplexers
To: Repeater-Builder@yahoogroups.com
Date: Monday, October 27, 2008, 9:14 AM
Is it OK to get some kind of storage container
ubject: Re: [Repeater-Builder] Duplexers
I would think that at the least you would want to build a small building,
even something close to a large dog house, 3'D X 4'W x 4'H. Leaves at least
a little room to breath and work around, heat may be a factor depending on
the cans yo
wally-world was around
$100 or so.
Scott
Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Rd
Boswell, PA 15531
- Original Message -
From: Mung Bungholio
To: Repeater-Builder@yahoogroups.com
Sent: Monday, October 27, 2008 10:40 AM
Subject: RE: [Repeater-Builder] Dupl
Yes I agree, something designed to be out in the elements a bit more.
From: Scott Zimmerman <[EMAIL PROTECTED]>
To: Repeater-Builder@yahoogroups.com
Sent: Monday, October 27, 2008 10:59:24 AM
Subject: Re: [Repeater-Builder] Duplexers
I often thought
That is what I was thinking of too.
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Scott Zimmerman
Sent: Monday, October 27, 2008 10:59 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexers
I often thought about using a Rubbermaid
[mailto:[EMAIL PROTECTED] On Behalf Of Scott Zimmerman
Sent: Monday, October 27, 2008 10:59 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexers
I often thought about using a Rubbermaid product.
Here is a deck box:
Rubbermaid item #3743
or a vertical
ey sell high-dollar NEMA
cabinets with their own air conditioners, but they probably won't sell one to
me!
73,
Paul, AE4KR
- Original Message -
From: Mung Bungholio
To: Repeater-Builder@yahoogroups.com
Sent: Monday, October 27, 2008 7:14 AM
Subject: [Repeater-Builder] D
I have it on good advice from Lloyd Alcorn at Wacom Products (RIP Wacom)
that Black Magic is involved.
Steve
In a nutshell, the cavities are either 1/4 or 3/4 wavelength with
coupling loops oriented for a particular degree of coupling, and also
the length affects coupling. Some cavities use 2 lo
March 15, 2004 2:42 PM
Subject: RE: [Repeater-Builder] duplexers
> I have it on good advice from Lloyd Alcorn at Wacom Products (RIP Wacom)
> that Black Magic is involved.
>
> Steve
>
> In a nutshell, the cavities are either 1/4 or 3/4 wavelength with
> coupling loops oriente
From: "David Schornak" <[EMAIL PROTECTED]>
To:
Sent: Monday, March 15, 2004 5:25 PM
Subject: [Repeater-Builder] duplexers
> has anyone or does anyone know where tofind the math formulas to help you
> design a set of cavities for a duplexer? I have been looking on the web
and
>
/~g4kqu/gb3dx_photos.htm
- Original Message -
From: "David Schornak" <[EMAIL PROTECTED]>
To:
Sent: Monday, March 15, 2004 4:25 PM
Subject: [Repeater-Builder] duplexers
has anyone or does anyone know where tofind the math formulas to help you
design a set of cavities f
Found this site too:
http://www.amalgamate2000.com/radio-hobbies/radio/coaxial_resonators.htm
- Original Message -
From: "David Schornak" <[EMAIL PROTECTED]>
To:
Sent: Monday, March 15, 2004 4:25 PM
Subject: [Repeater-Builder] duplexers
has anyone or does anyone k
I suspect when you add the coupling loop length that the interstage cables
will be on the order of 3/4 wave length, or around 10" or so.
I ran into the 3/4 wavelength business taking some 10" Sinclair VHF
cavities, and building a 5 channel UHF combiner with cavities and dual
junction isolators.
S
Steve I am beginning to believe that with as much info as I have found.
> I have it on good advice from Lloyd Alcorn at Wacom Products (RIP Wacom)
> that Black Magic is involved.
>
> Steve
>
> In a nutshell, the cavities are either 1/4 or 3/4 wavelength with
> coupling loops oriented for a parti
-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mackey
Sent: Monday, August 30, 2010 4:44 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Duplexers
Our club was recently given a 220 repeater. We have two seperate antennas.
eater-buil...@yahoogroups.com_
(mailto:Repeater-Builder@yahoogroups.com)
Subject: [Repeater-Builder] Duplexers
Our club was recently given a 220 repeater. We have two seperate antennas.
We do not have a duplexer. My question is do we have to have a duplexer?
How
can we keep the transmitter from desensi
vity of the receiver. The receiver bandwidth and antenna types also
> play a factor.
>
> 73, Eric Lemmon WB6FLY
>
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:Repeater-Builder@yahoogroups.com]
> On Behalf Of Mackey
> Sent: Monday,
other pursuits.
Good luck!
73,
Paul, AE4KR
- Original Message -
From: cmcclel...@aol.com
To: Repeater-Builder@yahoogroups.com
Sent: Monday, August 30, 2010 6:44 PM
Subject: Re: [Repeater-Builder] Duplexers
Thank you for your response.
The problem is that the rep
:
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of cmcclel...@aol.com
Sent: Monday, August 30, 2010 5:45 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Duplexers
Thank you for
Since We are on the Topic of Duplexers, And some claim there is no such
thing as a Dumb Question but at the Risk of Asking one I will take a
chance , I have the Wacom 4 can on My 220 System,
The Question I have in a non controlled environment such as No Heat or Air
Will the Duplex
r@yahoogroups.com
>[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mackey
>Sent: Monday, August 30, 2010 4:44 PM
>To: Repeater-Builder@yahoogroups.com
>Subject: [Repeater-Builder] Duplexers
>
>
>
>Our club was recently given a 220 repeater. We have two seperate antenn
Wow this must of Really been a Dumb question , No one answered it
Don KA9QJG
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of ka9qjg
Sent: Monday, August 30, 2010 9:07 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder
No problem. Most are in non-climate controlled environments.
Chuck
WB2EDV
- Original Message -
From: ka9qjg
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, August 31, 2010 1:42 PM
Subject: RE: [Repeater-Builder] Duplexers
Wow this must of Really been a Dumb
peater-Builder@yahoogroups.com
> *Subject:* RE: [Repeater-Builder] Duplexers
>
>
>
>
>
> Since We are on the Topic of Duplexers, And some claim there is no such
> thing as a Dumb Question but at the Risk of Asking one I will take a
> chance , I have the Wacom 4 can on M
eater-buil...@yahoogroups.com] On Behalf Of ka9qjg
Sent: Monday, August 30, 2010 9:07 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Duplexers
Since We are on the Topic of Duplexers, And some claim there is no such
thing as a Dumb Question but at the Risk of Asking one I will take
@yahoogroups.com
Subject: RE: [Repeater-Builder] Duplexers
I have a set of Wacoms on 2-meters in a totally uncompensated shack, running
from the teens in the winter to probably 150 in the summer. I've never had an
issued. I have another set in a similar shack, but it it air condition
; Sent: Monday, August 30, 2010 9:07 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] Duplexers
>
>
>
>
>
>
> Since We are on the Topic of Duplexers, And some claim there is no
> such thing as a Dumb Question but at the Risk of Aski
nt: Monday, August 30, 2010 9:07 PM To:
Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Duplexers
Since We are on the Topic of Duplexers, And some claim there is no
such thing as a Dumb Question but at the Risk of Asking one I will
take a chance , I have the Waco
owler" < k...@k4fh.com
>
To: < Repeater-Builder@yahoogroups.com
Cc: "ka9qjg" < ka9...@wowway.com
>
Sent: Tuesday, August 31, 2010 11:08 AM
Subject: RE: [Repeater-Builder] Duplexers
For there to be condensation there must be humidity in the air. The
more hu
31, 2010 1:42:32 PM
Subject: RE: [Repeater-Builder] Duplexers
Wow this must of Really been a Dumb question , No one answered it
Don KA9QJG
From:Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com]
On Behalf Of ka9qjg
Sent: Monday, August 30, 2010 9:07 PM
To
I've never had a problem. I would say that if the duplexers are out
of tune on the transmit side there is a possibility that they might get
hot, then cool off. This may cause them to take in moist air and cause
condensation. I've never seen it happen, but I can see how it could.
73, Jow, K
Of Mackey
Sent: Monday, August 30, 2010 4:44 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Duplexers
Our club was recently given a 220 repeater. We have two seperate
antennas. We do not have a duplexer. My question is do we have to have a
duplexer? How can we keep the transm
, No one answered it
>
>
>
> Don KA9QJG
>
>
>
> *From:* Repeater-Builder@yahoogroups.com [mailto:
> repeater-buil...@yahoogroups.com] *On Behalf Of *ka9qjg
> *Sent:* Monday, August 30, 2010 9:07 PM
>
> *To:* Repeater-Builder@yahoogroups.com
> *Subject:* RE: [Repeate
t;
>
> - Original Message -
> From: "Chris Fowler" >
> To:
> >
> Cc: "ka9qjg" >
> Sent: Tuesday, August 31, 2010 11:08 AM
> Subject: RE: [Repeater-Builder] Duplexers
>
> > For there to be condensation there must be humidity in th
ink I'd rather err on the side of staying a little warm in a repeater shack,
within reason.
73,
Paul, AE4KR
- Original Message -
From: ka9qjg
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, August 31, 2010 11:42 AM
Subject: RE: [Repeater-Builder] Duplexers
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