Thank you for your help. I appreciate it! I've put a couple of questions
inline below.
On Sat, Jan 2, 2010 at 4:18 PM, Kevin Custer kug...@kuggie.com wrote:
Michael Cox wrote:
I justed purchased a GE MAST II UHF repeater that has a 450-460 split
(see it at
Has anyone had any success converting a Motorola Micor TLB1413C amplifier to 6
meters. I know the C is 36-42 Mhz split but I have one available. Any help
would be appreciated.
Charles, NM4V
Hi everyone ,
Happy new year!
We are a club looking for an audio mixer that can mix up to 3 or 4 repeaters
with different impedance, we are hooking up 3 different repeaters together. We
built an homemade audio mixer but not very stable , we hope to find something
solid and well shielded
Michael Cox wrote:
Thank you for your help. I appreciate it! I've put a couple of
questions inline below.
Well - you'll need a duplexer no mater the price... grin
I was under the impression that if I had two antennas, I could get by
without a duplexer. Thanks for the heads up.
Re: Audio Mixer for multiple repeaters
I know it wouldn't at first glance be considered a mixer...
but using an LDG Voter as a mixer (and voter) works out
very well.
http://www.ldgelectronics.com/c/252/products/5/19/1
If you don't need as many inputs, consider the CAT Auto
RLS-1000B.
For fun we operated a 400 watt erp repeater with two antennas and no duplexer.
We were able to achieve about 100db attenuation by using the roof equipment
penthouse. The transmit antenna was mounted on the top of the penthouse and
the receive antenna was installed diagonally from the transmit
Kevin mentioned feedline, but didn't mention to stay away from LMR or 9913
type foil/shield combinations in duplex service.
Chuck
WB2EDV
- Original Message -
From: Kevin Custer
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, January 03, 2010 11:12 AM
Subject: Re:
I believe the issues with LMR were resolved years ago Chuck. Can you refresh
the group on some of the primary issues?
Thanks,
dave
p.s. we've been using it for five years at ten sites with no problems.
- Original Message -
From: Chuck Kelsey
To: Repeater-Builder@yahoogroups.com
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Yes, it was resolved at a lot of commercial sites by not allowing it to be used
;-)
Usually after a bit of time, the cable will start to become a source of noise
as the two dissimilar metals start to react with each other. There are many
documented cases of this problem. Search this group's
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Yes, it said that in the article. However, the article went on to say that some
of the ham dealers sold it for duplex service all the time, so the writer
concluded (somehow) that it was OK to use. Go figure.
Chuck
WB2EDV
- Original Message -
From: AJ
To:
If you are just mixing audio, a cheap mixing board for music applications works
well.
http://www.zzounds.com/item--BEHMX400
-or-
http://www.zzounds.com/item--BEHXENTX802
Behringer is not normally know for it's quality, but some of their items work
really well. Here are some higher priced
Hi fellas,
I need some input...
I have 11, yes 11 DB products Bp cans from various combiners. They are 8 in
diameter and have the model #SP8145-VT1 or SP8145-VT2 on some of them. I want
to turn them into BpBr cans in order to make duplexers out of them. I think I
will need some of those little
At 1/3/2010 11:11, you wrote:
Yes, it was resolved at a lot of commercial sites by not allowing it to be
used ;-)
For me, the resolution came from a Times Microwave sales rep. who
admitted that LMR-400 is not appropriate for duplex use.
Having said that, you can get away with using it in
Hey gang, it's me again.
The repeater package didn't sell as a whole so I'll offer the stuff
individually.
Just make me your best offer on whatever you want.
I'm not thrilled about shipping the duplexers but I'll do my best.
--
ok, you can look over the pictures from the links below, i'll
Very interesting...all our sites are dense with RF from Public Safety radio
systems 800, 700, VHF, etc. No problems in five years. I suspect it has more
to do with how the RF connections are made than the LMR cable. Just my
subjective opinion of one.
73,
dave
wa3gin
- Original Message
Havent opened on of the dB cans, but if it is like these sinclairs I
have, Replace the ground lug on the coupling loop with a Johansen cap.
For VHF you will need the 1-20 caps or 1-30pF. For 220 and UHF use the
2-10pF. This has to do with the split, for me it is about 8pF for the
notch to appear
Also you may wish to try building dual loop BpBr as described here
http://www.repeater-builder.com/antenna/pdf/ve2azx-duplexerinfo.pdf
Takes more connectors and tees, but you don't have to modify the
original cavity.
On Sun, Jan 3, 2010 at 1:06 PM, DCFluX dcf...@gmail.com wrote:
Havent opened
Very interesting...all our sites are dense with RF from Public Safety radio
systems 800, 700, VHF, etc. No problems in five years. I suspect it has
more to do with how the RF connections are made than the LMR cable. Just my
subjective opinion of one.
Actually it is the cable. My discussion
Yes, that's one of them. Darn thing only ran for 30 years before it broke. :)
'JK
--- In Repeater-Builder@yahoogroups.com, n...@... wrote:
At 1/2/2010 13:20, you wrote:
G.E. pre-Prog.
'JK
Is that 224.660 W6GAA on PV? Can't key it this evening.
Bob NO6B
Yes, I agree. Various plated connectors can also be a problem. Unfortunately
most antenna manufacturers don't use silver plated coax in their pigtails
and harnesses.
Chuck
WB2EDV
- Original Message -
From: n...@no6b.com
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, January 03,
Down here in Florida this week we are ENJOYING somewhat of a cold wave.
Today's high around Tampa about 45 degrees. A bit unusual. My repeater on
224 mhz is having a fit today. Sounds like some kind of a mix getting in,
sometimes not strong enough to open the squelch, sometimes it will creep in
? - Mike
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Mike,
The first question that comes to mind is, what is the make and model of your
repeater? Some repeaters have better low-temperature performance than
others, especially when fully-compensated channel elements are used.
Perhaps the duplexer is affected by the temperature, although 45 degrees
Our local vhf machine experienced a loosening squelch and verhy long tail with
extremely low temps (-30f). A slight tweak on the squelch solved the issue. Its
in an unheated environment.
Sent on the TELUS Mobility network with BlackBerry
-Original Message-
From: Eric Lemmon
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a warehouse.
Can the below nom temps be creating some issues with the nearby environment
and some equipment elsewhere or is it more likely that something is 'chilly'
in my own rack? - Mike
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At 1/3/2010 12:16, you wrote:
Yes, I agree. Various plated connectors can also be a problem. Unfortunately
most antenna manufacturers don't use silver plated coax in their pigtails
and harnesses.
This is probably why all Cushcraft 4-pole antennas eventually cause desense
to the systems they're
Well Cushcraft what can I say? I never saw one I liked. Gamma
matches make pretty poor performers in my opinion.
I don't believe any of the Decibel line over the years used anything but
standard copper braid on any of their antennas. My thought is that while the
copper braid may
The recent discussion about converting a Micor 2W UHF station to 12W by
modifying the TLE1893B Antenna Network is a rehash of the same topic that
was discussed on R-B back in May 2004. One of the key points made was that
the voltage representing reflected power is scaled differently in the 12W
hello looking for someone to tune some duplexers for me couple of vhf and a uhf
will pay what ever i need to and cover postage costs for return, licenced
supplier and will send copys of licences if required thank you
phill
bridlington
east yorkshire
Phil;
Check with KA1RCI, Steve (st...@ka1rci ) He bought a couple of sets of 220 mc.
duplexers from me and retuned them to our band. He has all the equipment.
Clay W 8 J V V
- Original Message
Hi Skipp025,
How would this handle the core and the PTT adio and would it be easy to match
the impedance from all the repeaters ?
Thanks for thr info.
GVÂ
From: skipp025 skipp...@yahoo.com
To: Repeater-Builder@yahoogroups.com
Sent: Sun, January 3, 2010
To follow up on Roger's 13-509 story, we built one also in the mid 70's and has
been in continuous service in the Dallas area since, along with a pair of home
built 224-JJ antennas (DB called them a 244 back then) - no duplexer (easy to
do when you are on a 1500' tower). The radios may be hard
Well speaking of cold we have a MVP remote RX which is a duplexed 2
meter rx to 70 cm tx that is in a elevator room on top of a 15 story
building and that room is largly at near ambient temperature and now
with the cold seems slow to come up. The elements were temp compensated
etc and I really
Randy,
I am surprised that your building inspector allowed your repeater to be
installed at that location. Article 620.37(A) of the National Electrical
Code forbids any equipment or wiring not directly associated with the
elevator to be installed in elevator control rooms or machinery spaces.
Interesting note about that article. I used to do maintenance on a couple
stations that were located in an elevator control room at a hospital in NW wash
DC. I wounder now if they have been moved? It was a very erie place to work on
a station when one of the elevators would start running.
At 1/3/2010 04:37 PM, you wrote:
Well speaking of cold we have a MVP remote RX which is a duplexed 2
meter rx to 70 cm tx that is in a elevator room on top of a 15 story
building and that room is largly at near ambient temperature and now
with the cold seems slow to come up. The elements were
Well Eric, I guess I am not sure if it really qualifys as the elevator
room or not as I beleive that is a story below. Only time anyone has
been there is when we installed it. Therefore it has been a long time
since I have been there, as the need hasn't happened. Since a trip that
requires
Well you might have hit the nail on the head. It is turned down to
about 3-4 watts as that was all we needed to make the path. I only
noticed this last winter and this one now but guess it could have been
like that from the beginning without us noticing it. Next time I have
one to test I will
Thanks, George, for the chart.
Today I put the board on the bench and applied power as noted in the
manual for bench testing. First thing I tested was the reference
voltage and lo and behold it was wandering around (light bulb above head
begins to glow!).
Close inspection of the ref voltage
I remember the 146.79 repeater in Henrietta (Rochester) NY back in the
mid/late 70's It was housed in an old 'fridge in a shed in the middle
of a farm field, at the base of the tower. IIRC, it had a fan to cool it in
the summer, and a 25-watt light buld to keep it warm in the winter.
Will this Duplexer work with the Mastr II repeater?
http://cgi.ebay.com/UHF-50W-6-CAVITY-DUPLEXER-FOR-REPEATER-FREE-TUNING_W0QQitemZ350300447727QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item518f88a3ef
On Sun, Jan 3, 2010 at 9:32 AM, WA3GIN wa3...@comcast.net wrote:
For fun we operated a
I totally agree with that Bob. I believe the dissimilar metal *thing* has far
less to do with generating noise and PIM, than the simple fact that we have
separate wires and elements constructing the shield that have very bad
electrical connections with each other.
Aluminum is known to always
What cable do you guys recommend?
Thanks,
Michael H. Cox
michaelh...@gmail.com
-Original Message-
From: larynl2 lar...@hotmail.com
Date: Mon, 04 Jan 2010 05:36:20
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Mastr II mods and parts
I totally agree with that
For connection between duplexer and radios I like 1/4 Superflex, but RG400 or
RG142 is also great. To a duplex antenna for short runs those same cables
could be used, keeping loss figures in mind. Otherwise appropriately sized
Heliax or equivalent cables should be used.
Laryn K8TVZ
--- In
I would not recommend that duplexer for a repeater.
-- Original Message --
Received: Sun, 03 Jan 2010 08:47:16 PM PST
From: Michael Cox michaelh...@gmail.com
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Mastr II mods and parts
Will this Duplexer work with the
Any reasons?
Thanks,
Michael H. Cox
michaelh...@gmail.com
-Original Message-
From: JOHN MACKEY jmac...@usa.net
Date: Sun, 03 Jan 2010 21:55:33
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Mastr II mods and parts
I would not recommend that duplexer for a
Any reasons?
First, it could be used as a duplexer, however you don't get all the benefit
you would get from a BpBr duplexer.
The one in question is a notch only duplexer, the cavities are designed to
notch the two frequencies in use. While it can work, you generally cannot
get the required
Excellent. Thanks for the info. This is going to be my first repeater and so
I'm still learning. Thx.
Thanks,
Michael H. Cox
michaelh...@gmail.com
-Original Message-
From: Daron Wilson daronwil...@yahoo.com
Date: Sun, 3 Jan 2010 22:22:05
To: Repeater-Builder@yahoogroups.com
Subject:
You might want to inspect your connectors first to see if you have any
moisture going into the connectors good Amp connectors help out
with extremes. Used to have a repeater in NYC. When it snowed or got
wet, it squealed and grunted with 9914. Swapped out the old cabe to
the good stuff Heiiax
mobile duplexers generally have poor performance, not enough for a decent
repeater. The model you suggested is one of the worst.
-- Original Message --
Received: Sun, 03 Jan 2010 10:04:33 PM PST
From: Michael H. Cox michaelh...@gmail.com
To: Repeater-Builder@yahoogroups.com
Subject: Re:
Ok. Thx for info. I appreciate it.
Thanks,
Michael H. Cox
michaelh...@gmail.com
-Original Message-
From: JOHN MACKEY jmac...@usa.net
Date: Sun, 03 Jan 2010 22:43:41
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Mastr II mods and parts
mobile duplexers generally
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