I used one twisted pair in un-shielded CAT 5 in my Fire Dept to connect
a radio to an audio amplifier system.
The run was over 100 ft. The audio was tapped at the internal speaker of
the radio at a comfortable listening level.
The other end of the wire went into the aux audio input of a audio
Yeah, same as 220.
There's not really a need for an amateur rig anyway. There are so many
commercial rigs that go there easily, and you would never be able to buy an
amateur rig with the performance of a Spectra!
On Sat, Feb 27, 2010 at 11:35 PM, JOHN MACKEY jmac...@usa.net wrote:
Because
My favorite is direct burial + shielded cat cable.
I've got some here that I've been using for controller to device hookups.
As well as the run from the house to the shed.
Shielded with 100% foil and a joke of a braid.
It is flooded with goo to keep the moisture out as well.
Nice stuff for the
Underground gel filled , several types one of them being as you describe foil
lined and it is cheap and extremly resistant to the egress of time and rf
To: Repeater-Builder@yahoogroups.com
From: demo...@rollanet.org
Date: Sun, 28 Feb 2010 07:47:23 -0600
Subject: RE: [Repeater-Builder] Re:
On 2/27/2010 4:53 PM, Joe wrote:
Oz, in DFW wrote:
Make sure you use twisted pair. Station wire like that use to wire
houses is often not twisted. Ethernet cable is good and has a high
twist pitch - better for this application.
I wonder if CAT 6 would be better than CAT5 due to the
True, but where is the hack for the front panel programmable Spectra?
It's nice to not be limited to preprogrammed channels.
Joe M.
James Adkins wrote:
Yeah, same as 220.
There's not really a need for an amateur rig anyway. There are so many
commercial rigs that go there easily, and
I used to be like that, but now that I've gone commercial, I don't find
that's an issue. I would rather have the improved performance. Plus, you
can program in simplex channels, etc. If you can fill up 128 memory
channels on 900 MHz in your area, that's great. Around here, we have 4
repeaters
On Sat, 27 Feb 2010, JOHN MACKEY wrote:
Using balanced audio in a broadcast environment, I have on rare
occasions experienced issues with cross-talk between long runs of
un-shielded balanced audio lines. (inductive pickup??) I always
wondered if the wires were truly balanced when that
I rum spectras on V/U/900 and love em. I just bought one for P25. As for
programming, once you get a codeplug set for your area and the areas you travel
to it is easy to use. The zone features are nice. 1 or 2 zones per area and
off you go. I also run a regular dual band ham radio for the
At 2/27/2010 09:56 AM, you wrote:
I have been following the 9.6 Volt Micor Voltage information. One post
indicated that if one were to replace the Stock MICOR Supply with a
switcher and add the 9.6 Volt circuit, the monthly electric bill to run
the repeater could be significantly reduced. Is
On Sun, 28 Feb 2010, Chris Curtis wrote:
My favorite is direct burial + shielded cat cable.
I've got some here that I've been using for controller to device
hookups. As well as the run from the house to the shed.
Shielded with 100% foil and a joke of a braid. It is flooded with
goo to
Bob,
Let's not denigrate switching power supplies as a class, just because of a
few bad apples. Switchers-as a class- are more efficient and reliable than
linear supplies. Sure, there may a few brands out there that are spur
generators, but not the top-of-the-line switchers from DuraComm,
Steve,
Why not put the DB-224 folder inside the DB Antennas folder?
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of KD8BIW
Sent: Saturday, February 27, 2010 10:36 PM
To:
A friend of mine full-time broadcast engineering told me he can detect zero
crosstalk between pairs within the same CAT 5 cable at line level. As you
suspect, balance is very important.
Laryn K8TVZ
--- In Repeater-Builder@yahoogroups.com, JOHN MACKEY jmac...@... wrote:
Using balanced audio
Not necessarily true, John.
There are pockets of HIGH activity on 900 MHz - especially on the coasts,
where PAVE PAWS has forced the reduction or elimination of 70cm repeaters.
Unfortunately, I'm not on either coast (I'm in the Chicago area) so your
observation is accurate -- for me anyway.
I know it's a quick and dirty way to go about it, but after nearly 20 years of
operation, I can't complain. Besides, I had the parts in my junk box. Today,
I'd go with an LM317. With age comes wisdom. And the money to do it right LOL!
Bill
KB1MGH
From:
Don't forget, CAT cables have different twist rates for each pair to minimize
crosstalk between them. If one pair doesn't work, try another.
From: larynl2 lar...@hotmail.com
To: Repeater-Builder@yahoogroups.com
Sent: Sun, February 28, 2010 12:27:53 PM
Subject:
What really needs to happen is for someone to design a transistor or FET RF
power doubler for all those 450 Mhz radios that will be coming or now surplus
on the commercial market. Then amateur 900 MHz would boom. Don't ask me to do
it, I don't have any time.
WA9ZZU
--- On Sun, 2/28/10, Mark
http://www.gemoto.com/900/coverage_NEAR900.htm
This is a map of eastern Mass. 900 is very active especially with the linked
repeaters.
Bill
KB1MGH
From: Mark n9...@ameritech.net
To: Repeater-Builder@yahoogroups.com
Sent: Sun, February 28, 2010 12:47:33 PM
On Sun, 28 Feb 2010, allan crites wrote:
What really needs to happen is for someone to design a transistor
or FET RF power doubler for all those 450 Mhz radios that will be
coming or now surplus on the commercial market. Then amateur 900 MHz
would boom. Don't ask me to do it, I don't have
A while ago someone was looking for Motorola vibrasponder reeds for paging
tones, and I responded back that I had a bunch of them but had to find them.
I've since lost that person's name/email address. I finally found them
(accidentally). If you're the person that wanted them, please email
On Sun, 28 Feb 2010, Mike Morris WA6ILQ wrote:
2) the pair that was receiving the problem was a high impedance load
or an unbalanced load (i.e. one side grounded). Use an ungrounded 600
ohm winding from a transformer on each end of each pair.
The nominal impedance of a copper pair from CAT5
Kris, the reason we don't put T-1 on cable pairs is of course NEXT FEXT.
The receive level
from a T-1 MUX is 6 Volts P:P so it will spill all over the cable.
The standard for T-1 in seperately shielded pairs.
We do use twisted pairs at a cross connect panel for short runs... (DSX-1
Panel)
The
At 12:38 PM 02/28/10, you wrote:
On Sun, 28 Feb 2010, Mike Morris WA6ILQ wrote:
2) the pair that was receiving the problem was a high impedance load
or an unbalanced load (i.e. one side grounded). Use an ungrounded 600
ohm winding from a transformer on each end of each pair.
The nominal
On Sun, 28 Feb 2010, Mike Morris WA6ILQ wrote:
2) the pair that was receiving the problem was a high
impedance load
or an unbalanced load (i.e. one side grounded). Use an
ungrounded 600
ohm winding from a transformer on each end of each pair.
The nominal impedance of a copper pair
At 09:13 AM 02/27/10, you wrote:
Anyone have a suggestion for a simple 50 ohm signal generator?
I have a number of VHF Phelps Dodge duplexers and several UHF flat
pack duplexers I'd like to be able to test prior to sale and
possibly rough tune for a few projects duing the waning weeks of
I have no doubt you are correct, but I'll still say that 900 Mhz amateur
activity in the US is not very strong (compared to other V/U bands).
-- Original Message --
Received: Sun, 28 Feb 2010 10:47:51 AM PST
From: Mark n9...@ameritech.net
To: Repeater-Builder@yahoogroups.com
Subject: RE:
You wrote:
Switchers -as a class- are more efficient and reliable than linear supplies.
As a Class...
More efficient - yes, More reliable - that's debatable.
In the two-way radio world, linear supplies are the rule, switchers are
the exception. In 25 or 30 years, we'll see if switchers are
Kevin,
So, these tower management companies no longer allow the latest Motorola and
Kenwood stations- which come with switching power supplies- to be installed
at their sites?
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
What's the rationale behind the LMR ban? Leakage?
lh
On Sun, Feb 28, 2010 at 6:35 PM, Kevin Custer kug...@kuggie.com wrote:
You wrote:
Switchers -as a class- are more efficient and reliable than linear
supplies.
As a Class...
More efficient - yes, More reliable - that's debatable.
In
HAL's number is 217-367-7373. Great folks to deal with.
Al, K9SI
--- On Sun, 2/28/10, Larry Horlick llhorl...@gmail.com wrote:
From: Larry Horlick llhorl...@gmail.com
Subject: Re: [Repeater-Builder] Micor Stock Power Supplies
To: Repeater-Builder@yahoogroups.com
Date: Sunday, February 28, 2010, 7:26 PM
What's the rationale behind the LMR ban?
I've never heard of it. As an installer, I'm always under pressure to use
less expensive feedlines than the venerable Heliax, and I had often
considered LMR, but never actually succumbed to the temptation. This is
interesting information. Is this a well documented phenomenon?
Anyone else like to
The subject comes up on this list about every other week. I can only assume you
are new.
LMR and similar cables are not rated for low PIM, a fact verified by the
manufacturer.
Chuck
WB2EDV
- Original Message -
From: Larry Horlick
To: Repeater-Builder@yahoogroups.com
Sent:
Indeed. I'll read the archives. Thanks.
73
On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@roadrunner.com wrote:
The subject comes up on this list about every other week. I can only assume
you are new.
LMR and similar cables are not rated for low PIM, a fact verified by the
Does anyone have a manual for a McMartin
TR-66A SCA Multiplex Receiver.
A whole manual would be nice, a schematic
should do...
Mike WA6ILQ
Look for this to appear in the next version of Icom's vocoder.
'JK
--- In Repeater-Builder@yahoogroups.com, Nate Duehr n...@... wrote:
What specific radio will do both NXDN and P25... and what would firmware
loads to do both legally, cost? Carrying a laptop and switching when needed,
Andrew has a coaxial cable similar (remarkably similar) to LMR, called CNT.
I guess the same cautions apply to
this product, too?
lh
On Sun, Feb 28, 2010 at 9:22 PM, Mike Morris WA6ILQ wa6...@gmail.comwrote:
Go here:
http://www.repeater-builder.com/antenna/ant-sys-index.html
Scroll down
Sorry, I cannot answer that question. My reference was more toward the
replacement of an existing linear supply or new installations such as
GMRS or Amateur Radio systems - repeater or otherwise. Whether or not
their rule applies to newer Motorola or other commercial radio
manufacturers -
--- On Sun, 2/28/10, Larry Horlick llhorl...@gmail.com wrote:
From: Larry Horlick llhorl...@gmail.com
Subject: Re: [Repeater-Builder] Micor Stock Power Supplies
To: Repeater-Builder@yahoogroups.com
Date: Sunday, February 28, 2010, 9:49 PM
Andrew has a coaxial cable similar
At 09:56 AM 02/27/10, you wrote:
I have been following the 9.6 Volt Micor Voltage information. One
post indicated that if one were to replace the Stock MICOR Supply
with a switcher and add the 9.6 Volt circuit, the monthly electric
bill to run the repeater could be significantly reduced. Is
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