Our local Medical Center, Scott and White Memorial has an RV park, and a Med 8 duplex base station, that uses 5 key clicks to operate a telephone patch to the ER Department.At times an interfering signal would cause the patch to go wild. We traced it down to the RV area and suspected an active
This is the antenna that was causing interference :-
http://www.winegard.com/interference.htm
There was also an ARRL article floating around a while back.
Andrew
--
---
KC2EUS - GM1YMI
KC2EUS/R 443.700 MHz 100 Hz PL
IRLP #4925 Elink #9969
www.kc2eus.org
Well, after a few months of agrivation, we have finally found the
trouble.
There is an internet and cellphone relay system on the tower as well
as the commercial FM transmitter. The problem was high speed data
being radiated at a very low level from the data line that runs from
the
Go to this adress for RS-50M...
http://www.repeater-builder.com/astron/astron-index.html
Best 73'
Eric VE2VXT
-Message d'origine-
De : Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] De la part de Gary
Envoyé : 26 mai, 2006 20:02
À : Repeater-Builder@yahoogroups.com
Objet
Jan Each radio should be put onto it's own simplex Fq, not a repeater pair. Be very careful when hooking up the RICK. I have two radios sitting in the shop right now because an employee thought it would be fun to play with the connction cables on two repeaters. Then he didn't remember what
I am using a pair of GM300 radios hooked up to a duplexer and getting
a repeater controller. The problem that I am having is the 250' run
of coax to get from the shack to the antenna.
My question is this. Can a preamp and dc injector be used when the
antenna it is hookup up to is both the tx
hi can any 1 help me ?i have a burndept be 527 transmiter ?its vhf ex
police ,any one got any info on it it as an eprom for the freqs.
Yahoo! Groups Links
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* To unsubscribe from this group,
I thought Florida was so flat, you didn't need
anything higher than 30 ft?!?!?!
Actually the trees at the signal killers here !!
Yahoo! Groups Links
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Please forgive me if this message is out of subject. I am trying
everything to locate this info and apologize if this message is out
of subject.
Scott
Hi All,
Well I finnally did it ! I have rid myself of most of my Motorola
eqpt ! I am now in the process of stocking up on Icom and I am in
Gary- This is going to sound a little simple-ish, but have you disconnected the
receive
antenna to see if the noise is still there with no antenna? This will
instantly indicate
whether the signal is strong enough to be coming directly into/overloading the
receiver
front end. If it goes
Easy question for all other repeater owners. What should I do?
I have a pair of folded looped-dipole antenna's for my repeater which
pushes 42 Watts. Once I add the antenna and duplexers I get 25 Watts
output. The antenna has 4 looped-dipole antenna's with phasing
harness but I only use one
Bob:
I think that I have a number of the connectors that you need. Correct me if
I am wrong, but the jumpers that you want come in two sizes on the mastr II.
They both have rca connectors on one and a chassis so239 on the other end
for the rf output.
If you think that these are the right
Date :05-29-2006
Time :8:00 PM CST
From :Lige Turner
Repeter-Builder
I,m Am A GMRS Radio Operater
And I Would Like More On How
To Build A UHF-FM Land Mobile
Radio(LMR)Repeter That Will Put
Out 100 Watts ERP Output And Would
Work On The Input Frequency 462.675 Mhz
CTCSS Tones 141.3 Hz And Output
No. You WILL NOT be able to run a preamp. You will have to compensate
for the loss by running big hardline.
Stop and think. How can the inline preamp amplify an incoming signal
with 20-30 watts coming up its input?
danryant wrote:
I am using a pair of GM300 radios hooked up to a duplexer and
With a single antenna in full duplex, the answer is no.
73,
Dick
- Original Message -
From: danryant
To: Repeater-Builder@yahoogroups.com
Sent: 26 May, 2006 16:03
Subject: [Repeater-Builder] DC INJECTOR AND PREAMP
I am using a pair of GM300 radios hooked up to a duplexer and
#1 Go for Height.
#2 Go for antenna gain (helps Receive and Transmit)
#3 Power - probably should not have much more erp than the users will have talking back...
Height is great up to a point. Once you get past 400 to 500 feet, the horizon doesn't get much further out without a substantial
That seems like a LOT of loss... Have you had the cans and antenna(s)
tuned?
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of atms169
Sent: Monday, May 29, 2006 9:46 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Double
Depending on the degree of coupling, at VHF, the loss in 2, 8 cavities will be around 1.5 dB., send or receive. 10 LOG 25/42 comes to around 2.25 dB. A little on the high side. I don't understand where adding the remaining 2 elements to a 4 element antenna will change the loss.
Seems the
The common answer is probably no... you can't run a remote
preamp as described in your post. There is always a but
There is a yes answer, but it takes quite a bit of hardware,
which doesn't seem practical except in very special cases. It's
a hardware layout of an rf tower mounted rx preamp
Why not use outdoor romex cable to extend AC power, and move the repeater closer to the antenna - loss would then be in the AC power line, and not in the transmission line. Assumes you can find a suitable and secure outdoor enclosure
Steve NU5D
On 5/30/06, skipp025 [EMAIL PROTECTED]
Yes, I was using the Top Half of a 4-element antenna. I have now
added the 3-Way connector and now have the entire antenna connected.
I have noticed it has cleaned up the receive on week stations but, it
seems to have dropped a little in the signal.
System was just re-tuned, duplexers and
Folks,
Ken and I have been chatting about my
problem. I have a VA3TO (DRF Technologies) Echolink Interface. It is
configured to port 3 on the RC210. PTT and COS lines are crossed as well
as the audio. The macro is set to link port 3 to port 1 and to unlink it
when I don't want Echolink
Yes, I was using the Top Half of a 4-element antenna. I have
now added the 3-Way connector and now have the entire antenna
connected.
I have noticed it has cleaned up the receive on week stations
but, it seems to have dropped a little in the signal.
System was just re-tuned, duplexers
The power should not have changed.I suspect you incur an antenna problem when u add the second half, causing some reflected power causing the repeater to start shutting back. Wonder what the forward and reflected power are, before and after?
I am not sure about a 3 way connectorA DB
Yes I have to add a tee for the bottom half. The entire antenna is
one complete unit 4-folded dipoles. Maybe I assumed and thought all
the phasing harness's were already there as I can see where the splits
are on the coax.
It is a VHF system.
I am measuring from out of the duplexers up the
Yes I have to add a tee for the bottom half. The entire
antenna is one complete unit 4-folded dipoles. Maybe I
assumed and thought all the phasing harness's were already
there as I can see where the splits are on the coax.
What kind of antenna is it?
I am measuring from out of the
Commercial antenna *unknown, with 80' LMR-400
I have another set of antenna's (Just 2 folded dipoles) and I can
change it out to see if that makes a difference. Strange, I did try
it with a full wave ringo-ranger and I still lose about 20 watts
through the duplexers.
Aaron
--- In
First check the VSWR. (it may be going up when you
add the second set of elements, the harness must be
done correctly for the VSWR to stay low)
If the VSWR is OK or things are corrected so it seems
OK then retune the duplexer using a Spectrum Analyzer
and Return Loss Bridge. Do this with the
I can't measure the reflected power. I can measure SWR and that is flat.
I am going to change it to another pair of folded dipoles and see if
it changes anything.
Aaron
--- In Repeater-Builder@yahoogroups.com, Steve Bosshard (NU5D)
[EMAIL PROTECTED] wrote:
The power should not have
Don't know if I'd trust the remote ac power option in
some cases.
The cable would have to be underground and/or well
protected above ground...
Plain Romex would scare me and make an insurance carrier
even more nervous.
cheers,
skipp
Steve Bosshard (NU5D) [EMAIL PROTECTED] wrote:
Why
I'd have to reverse items one and two... but they are both
the big ticket and interplay quite a bit.
Antenna gain is the major performance free lunch you can add
to a radio system and probably the best bang for the buck.
cheers,
skipp
#1 Go for Height.
#2 Go for antenna gain (helps
Last time I checked Part 95 it said 50w max. from the tansmitter not
50w ERP from the antenna. When did it change? With the min. losses
for the duplexer,connecters and feedline and max, gain on antenna and
radiation pattern he could achieve 200w ERP or more.
Doug N3DAB/WPRX486 GMRS/WPJL709
Hi
20w loss through the duplexer is a huge ammount, have you
measured the foward and reverse pwr of your ant, ideally
a good ant should be almost 1 to 1.
Steve
- Original Message -
From: atms169 [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, May 30, 2006 6:45 PM
National Emergency Assistance Radio Team Headquters wrote:
Date :05-29-2006
Time :8:00 PM CST
From :Lige Turner
Repeter-Builder
I,m Am A GMRS Radio Operater
And I Would Like More On How
To Build A UHF-FM Land Mobile
Radio(LMR)Repeter That Will Put
Out 100 Watts ERP Output And Would
Yes I have to add a tee for the bottom half.
That's your problem. You need the specific harness for a 4-bay antenna.
It will have the connector you connect to, which will split into two
paths, then further down each one will split again.
Tee connectors will cut the impedance in half. If you
to me this does not make sence ... what power do you get out of the
duplexer with a dummy load on ..
I think you have a problem with the ant. I don't see why you would lose so
much power out of the duplexer when you add the 2nd set of dipoles ..
Rick
On 30 May 2006 at 16:55, atms169
Alright for all those that think I'm an idiot, it's true I am!
I went back up to the repeater site and did some testing. I did find
that there was some water in the coax. I blew it out and re-sealed
the connectors. Now I am back up to 22-25 watts with a 1.1 match on
the 4 antenna's. So I
At 02:21 PM 5/29/2006 -0500, you wrote:
Anyone know what has happened to the RC-110 Group? Wonder if it is a
personal problem or has the group been disbanded?
---Sorry Jim! As other pointed out, I had been in Dayton and notification
from Yahoogroups about your attempt to join the list were
if you are loosing 3db in the duplexer then thay are out of wack but you said
thay where tuned ..
2 there is STILL a problem in the coax
3 there could be a problem in the ant connectors
check the specks on the duplexer when you got it tuned it should show you
how much loss and again CHECK
atms169 wrote:
Alright for all those that think I'm an idiot, it's true I am!
I went back up to the repeater site and did some testing. I did find
that there was some water in the coax. I blew it out and re-sealed
the connectors. Now I am back up to 22-25 watts with a 1.1 match on
Hi
getting there. If your coax had water in it, really you should replace it.
I take it that without the duplexer you are getting full
power, if so your duplexer is probably in need of tuning
as it sounds like it is actualy tuned to drop power on the
tx leg and not on the rx.
Steve
- Original
I interfaced an RC-210 port 3 to EchoLink for a friend, and had no
problem with the interface. The RC-210 was missing a land in the audio
path for port 3 and we had to add a wire jumper on the RC-210 board to
correct that, but the interface to EchoLink worked with no problem. We
used a
At 03:53 PM 5/30/2006 -0500, you wrote:
I interfaced an RC-210 port 3 to EchoLink for a friend, and had no
problem with the interface. The RC-210 was missing a land in the audio
path for port 3 and we had to add a wire jumper on the RC-210 board to
correct that, but the interface to EchoLink
I can't measure the reflected power. I can measure SWR and
that is flat.
You said you had a wattmeter to measure your power output - why can't
you use it to measure the reflected power?
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus
A buddy gave me a defective 220 amp, the VHF Engineering BLD 10/120.
Anybody have a scematic for this thing?
Thanks,
dave NA6DF
Yahoo! Groups Links
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* To unsubscribe from this group, send an
It hasn't changed. Some people get confused about the difference between
ERP and straight RF power.
Johnny
n3dab wrote:
Last time I checked Part 95 it said 50w max. from the tansmitter not
50w ERP from the antenna. When did it change? With the min. losses
for the duplexer,connecters and
I didn't think so...
Johnny wrote:
It hasn't changed. Some people get confused about the difference between
ERP and straight RF power.
Johnny
n3dab wrote:
Last time I checked Part 95 it said 50w max. from the tansmitter not
50w ERP from the antenna. When did it change?With the min.
It looks great Bob... can't wait to see when they become
available for sale. I'll probably be right there at the
order desk when they're ready.
The nice part about you repeater controller guys is there's
almost no work involved to make the box and write the software...
arr... arr...
Hi Skipp,
It looks great Bob... can't wait to see when they become
available for sale. I'll probably be right there at the
order desk when they're ready. The nice part about you
repeater controller guys is there's almost no work involved to make the
box and write the software...
It's RV season again here in Connecticut and I'm expecting a few of these to
roll into the area on their way to the casinos near our sites. The tough part
is that they only tend to stay a short time before they run out of money and
leave. Hard to find.
The problem seems to be worse when the
With money, the answer is yes. TX RX Systems makes a tower top amplifier that
will do this, but prepare to spend a lot of money. But, I wouldn't recommend
it because you would have an imbalance between receive and transmit unless you
run the proper amount of repeater transmit power to match
You can go to the FCC site and pull Part 95 like I just did and read
it for yourself.
I'm running 50w from my Micor rptr. xmtr. with 1.5db loss from a MOt.
1504 duplexer into 50' of 1/2' LDF4-50 heliax to a DB410 9.2db gain
omni antenna. This all calculates out to approx. slightly more than
I am looking for a print out of the TRN6091C Spectra-Tac Signal
Quality module. If any one has a copy I will gladly pay for a copy or
the cost to copy it along with the postage. This is the later verison
of the SQM and I have check a couple sites with no luck. If someone
has the the number to
Mike,
Give Motorola a call at 800-422-4210 then follow prompt to PARTS ID. Give
them the TRN part number and they will give you the manual number to order.
Or
You can give me a call at 214-671-9290 after 9:00 am and I will give you the
manual number.
I might be able to scan it and e-mail a
Mike,
The TRN6091C SQM is completely covered in the SpectraTAC Comparator
Reference Manual 6881039E50, which is still available from Motorola Parts
for about $11. Call 800-422-4210 to order a copy of this very valuable
manual.
73, Eric Lemmon WB6FLY
-Original Message-
From:
n3dab [EMAIL PROTECTED] wrote:
You can go to the FCC site and pull Part 95 like I just did and read
it for yourself.
I'm running 50w from my Micor rptr. xmtr. with 1.5db loss from a MOt.
1504 duplexer into 50' of 1/2' LDF4-50 heliax to a DB410 9.2db gain
omni antenna. This all calculates
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