Is there anyone in the Charlotte, NC area who could help me with some
non-radio information about the area?
My e-mail is jmac...@usa.net
thanks
Hi group.
I am working on some db224a folded dipole elements. I have cut them and have
added smaller tubing inside in order to make them longer for proper resonance
on 2m. I have measured several factory dipoles and have noticed that the length
from the bend of the loop to the support tube on
I believe that it's because the center conductor at the feedpoint (where it
attaches) becomes part of the length for the upper portion of the element.
Your real challenge may be the feed harness. You may need to construct a new
one, unless you get lucky.
Chuck
WB2EDV
- Original Message
Added comment...
I have seen variations on element lengths and harness designs over the
years. For some reason Decibel made changes here and there. One note I have
states that for the ham cut, the dipoles are 18.5 from tip to center of
element boom (both ends being the same length), or 37
don't forget www.carmachicago.com for
monitoring and freq lists for the Chicago area.
Ted Bleiman K9MDM
MDM Radio If its in stock...we've got it!
P O Box 31353 - Chicago ,IL 60631-0353
Phone 773. 255. 9838 fax 773.775.8096
see our offerings on
www.twowayshopper.com
Hi there Steve, I have made quite a bit of
progress with remote controlling the PRO5100 for
three channels. Do you or anyone in this group had
any experience in remotintg the Motorola PRO3100.
Grounding the channel change outputs in the
auxillary plug just make the channel light
flashing.
Steve
This is a continuation of the repeater interference issue we started to have
last October. Maybe with a few new pieces of data, it'll spur some new
thoughts.
Background:
Last October, our repeater (146.850 MHz) started experiencing pager
interference. The interference can be clearly heard on
Since it sounds like the problem is there continuously (with the correct
WX conditions) it pretty much rules out another TX that is less than
continuously on.
My very first thought was a TV antenna preamp. I've seen those generate a
lot of crap before. The paging may be mixing at the preamp.
That's one I hadn't thought of, Chuck. Definitely be a bugger to find!
Mike
WM4B
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey
Sent: Saturday, April 24, 2010 12:57 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re:
This kind of problem can come from pretty large distances.
One I was involved with ended up being a paging PA spur landing on my repeater
input - that was 15 miles away.
Another was a control station that the PA generated spurs induced by a
commercial FM station that was a mile from it. That
On Sat, 24 Apr 2010, Mike Besemer (WM4B) wrote:
The issue disappeared over the winter months. If it's a hot, sunny
day you can be sure the problem will be present. A hot, cloudy day is
also a fairly good bet. Also, a cooler, sunny day will bring it out.
Cool and cloudy or cold and sunny
--- In Repeater-Builder@yahoogroups.com, Kris Kirby k...@... wrote:
On Sat, 24 Apr 2010, Mike Besemer (WM4B) wrote:
The issue disappeared over the winter months. If it's a hot, sunny
day you can be sure the problem will be present. A hot, cloudy day is
also a fairly good bet. Also,
So has anyone conducted tests to determine if it is a mixing problem ?
sig gen and proximity ?
To: Repeater-Builder@yahoogroups.com
From: mwbese...@cox.net
Date: Sat, 24 Apr 2010 17:28:41 +
Subject: [Repeater-Builder] Re: Pager Interference Revisited
Elaborate please Barry. you lost me.
Mike
WM4B
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Barry
Sent: Saturday, April 24, 2010 2:36 PM
To: repeater-builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Pager Interference Revisited
foxhunt maybe ?
To: Repeater-Builder@yahoogroups.com
From: mwbese...@cox.net
Date: Sat, 24 Apr 2010 13:09:08 -0400
Subject: RE: [Repeater-Builder] Pager Interference Revisited
That’s one I hadn’t thought of, Chuck. Definitely
be a
Barry,
If you read the original post you'll see that we have beam headings pointing
every which way. Been there, done that, gone broke buying gas. We're not
ever sure what we're hunting yet.
73,
Mike
WM4B
From: Repeater-Builder@yahoogroups.com
Portable sig gen into the repeater site and swing it about the place in various
locations , sort of a revrse hammer to the power poles
if it is coax introduced you quickly confirm your suspicions but if its ac
introduced or grounding or some other oddity it usually helps to eliminate the
Given that the interference is in three different repeaters over about 40
air-miles, I have not done that. I've THOUGHT about it, but it didn't make
sense, give the circumstances.
73,
Mike
WM4B
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf
How close is Robins AFB? Maybe?
Chuck
WB2EDV
- Original Message -
From: Mike Besemer (WM4B)
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, April 24, 2010 2:48 PM
Subject: RE: [Repeater-Builder] Re: Pager Interference Revisited
Given that the interference is in
I don't think so, Chuck. I work on Robins and traverse it pretty much from
end-to-end daily. I also have to traverse it quite a ways just to get off
of it to go foxhunt this beast. Generally the signals on-base are weak to
non-existent.
It's bloody amazing how much RF crap is in the air.
Ted any chance you're going to Dayton???
Jerry VE3 EXT
Mike,
Does the interfering signal come and go or is it constant?
Does it have any AC component; ie buzz or hum at 60Hz, 120Hz, etc., or any raw
buzzing noise?
Are there any broiadcast TV stations in the area, DTV or LP translators?
Is the UHF pager signal analog, digital or both?
What test
Milt,
Not sure what you mean by 'come and go'. It's there when the pager
transmitter is up, gone when it's not. It also comes and goes with heat and
sun. we may have days with no interference if it's cool and cloudy or just
plain cold. Rain makes no difference.
Nothing remarkable
How do the paging signals get to the three transmitters? Wireline? 72
MHz link? 930 MHz link?
Matthew Kaufman
1 is wireline, two are satellite.
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Matthew Kaufman
Sent: Saturday, April 24, 2010 4:44 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Pager Interference Revisited
How do
Yes, but odds are good you are dealing with three different problems -
similar mechanisms but different participants. Unless of course you can
hear it at all three sites on the same frequency.
On 4/24/2010 1:48 PM, Mike Besemer (WM4B) wrote:
Given that the interference is in three
Mike,
I'm coming to this late, but I have comments and questions.
What type of hardware are the paging transmitters? What are the
repeaters in question, and what type of duplexers, feedline, and
antennas are used?
On 4/24/2010 3:42 PM, Mike Besemer (WM4B) wrote:
Not sure what you mean by
OK, this is probably not going to be an easy one.
I have seen several instances of mast-mounted TV preamps oscillating and acting
as miniature transmitters capable of sweeping over wide swaths of spectrum as
the temperature changes. They usually exhibit a raw AC buzz on the signal.
They
Not sure about the paging systems.
The repeaters themselves are a variety of systems and their architecture
really doesn't matter since the interference can be heard on the input
frequency with a string and a tin can. That being said, I know that 2 of
them (mine) are using DB-224s, 7/8
Problem is Milt, the darn signal level varies like crazy from day to day and
location to location. I can be in a certain spot and receive the signal
very well, drive until it disappears, and then have it reappear at a high
level as I continue on. Obviously elevation and blockage has a lot to do
Hi- Just tried to bring up the Pion and Simon site and no luck ? Anyone know of
a change ?? TKS,Jerry W8KQ
Dan,
I believe that the Digital Decoder Board is a TLN1467A Multifunction
Digital Decoder. The service manual for that station is 6881016E15, still
available from Motorola Parts for about $28. The manual is titled, Micor
Compa-Station Base Radio with Digital Decoder 132-174 MHz. The model
what is the range of a 800mhz handheld 4watts with msf5000 repeater 450watts on
the antena
Any approximation would depend on the repeater antenna height and the terrain
of the area.
I would hate to see the price tag on an 800MHZ 450W amplifier :-)
I do mean literally approximation. Many factors come into play. Especially at
high frequencies.
The length and type of the antenna
George,
Since the range of any repeater system is generally dictated by how well
it receives distant users and not by the transmitter power, the effective
sensitivity of your receiver during full duplex operation will determine
your range. My gut feeling is that such a system would do well with
Exactly, so like i said what type of cable are you using as line loss will
seriously effect receiver sensitivity.
--- On Sat, 4/24/10, Eric Lemmon wb6...@verizon.net wrote:
From: Eric Lemmon wb6...@verizon.net
Subject: RE: [Repeater-Builder] how far
To: Repeater-Builder@yahoogroups.com
Date:
ok the antenna is from cell site 14dbm 4-element in a plastic housing, the
amplifier is 600 watts capable linear mosfet 8element hybrid splitters and
combiners... but the power supply is up to 65 ampers at 24 volts, driven by a
C class 130 watt amplifier. the antenna is not on a commercial
OK there is a cute little program that actually comes fairly close to
calculating effective radio range based on height, power, line loss(has a cable
database), and frequency. Add the cavity losses in with the line loss.
Calculate the portable at 6 feet, unity gain, using worst case terrain
At the risk of mentioning something that's been mentioned and/or checked by you
before...
I believe you said that linking to the sites is not terrestrial RF but wireline
and satellite. Be sure that there isn't some RF linking that's been fogotten
by someone not very familiar with the entire
Somewhere between 2000' and 200 miles depending on the terrain between
the HT and the 5000.
Joe M.
George wrote:
what is the range of a 800mhz handheld 4watts with msf5000 repeater 450watts
on the antena
the terrain is in new york city area.
thank you for the consideration and the fast response!
--- In Repeater-Builder@yahoogroups.com, kevin valentino kevinvalent...@...
wrote:
OK there is a cute little program that actually comes fairly close to
calculating effective radio range based on
Laryn,
I don't 'think' there are any forgotten links, but I'll certainly ask the
question when I speak to the owner again. He's very open about his systems
and I believe he's very involved, but like any of us who is getting older,
it's possible he forgot something.
I agree about the spur
Wonder if you might supply a link to the program? It would be useful in
understanding the range of my 440 machine. Thanks.
KA9MXW
- Original Message -
From: kevin valentino
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, April 24, 2010 9:00 PM
Subject: Re:
Try, www.pionsimon.com
They have a new web site for about a month now
It worked for me just now...
73 John VE3AMZ
- Original Message -
From: orangetruck38 orangetruc...@yahoo.com
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, April 24, 2010 7:11 PM
Subject:
As mentioned finding the trigger both with and without the antenna would assist
with a solution , it could be very simple but you need to establish possible
triggers and monitor accordingly with the Spec unit
What Coax or hardline and antenna's are in use for both rpt's ? What happens
when another RX is used at the site? Maybe a IF issue with the Ham rpt's and 72
mhz some thoughts.
Ryan n3ssl
Allright just found the darn program. Was on an older machine. Norton picks up
a virus, ARRGH, so i will remove it and send it to ypu. You can share this
amongst yourselves but I would appreciate if you DID NOT upload it to any files
section of ANY group , it is copyrighted. Back to removing
No guys. The signals on the INPUT are heard in many places around town. If
the signals are on the INPUT it ain't the ham equipment.
Aside from that, I've already stated that the hardline is 7/8 and the
antennas are DB-224.
WM4B
_
From: Repeater-Builder@yahoogroups.com
Just for grins, find a place (house) to hook your spectrum analyzer up to
the local cable system and see if it is on there.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mike Besemer (WM4B)
Sent: Saturday, April 24,
You're reading my mind, Gary!
73,
Mike
WM4B
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Gary Schafer
Sent: Saturday, April 24, 2010 10:59 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: Pager
Jim,
Try this guy, Kurt Gruber. kurtgru...@yahoo.com
He works on IFRs.
Ken
WA6OSB
--- In Repeater-Builder@yahoogroups.com, George C geo...@... wrote:
That's the smaller series 6 pin, S406, the IFR used the larger one with
locating pin.
G
--- In Repeater-Builder@yahoogroups.com,
Sent the program to George, Bon Hal.
If anyone else wants a copy you can ask myself or them. Please do not post It
in a file section on any groups, (I look in those), It's copyrighted.
It's nothing fancy but does a fairly good job with some nice little utilities
to boot. Old as dirt but hey I
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