At 10:50 PM 08/30/07, you wrote:
>At 12:25 AM 2007-08-31 -0400, you wrote:
>
>>Our local FD has been plagued by theives stealing the aluminum cans from
>>our can trailer.
>
>FWIW one ham club I know of have some kind of plug in cable connecting
>their building alarm system with the ARES/event trail
At 12:25 AM 2007-08-31 -0400, you wrote:
Our local FD has been plagued by theives stealing the aluminum cans from
our can trailer.
FWIW one ham club I know of have some kind of plug in cable connecting
their building alarm system with the ARES/event trailer. What kind of
sensors and such I
Our local FD has been plagued by theives stealing the aluminum cans from
our can trailer. It must be worth it. And the content of Heliax (no
matter what you call it) has to be higher than a thin walled can.
Joe M.
Ralph Mowery wrote:
>
> --- DCFluX <[EMAIL PROTECTED]> wrote:
>
> > Perhaps they
I just looked at the Andrew spec sheet for AVA5-50, which is the "Andrew
Virtual Air" replacement for LDF5-50, and the two cables appear to
identical. The AVA5-50 has a copper tube inner conductor and a corrugated
copper outer conductor. I suspect that the thickness of both inner and
outer conduc
Isn't LDF a copper shield with an aluminum core that has copper coating on
it?
Jesse
On 8/30/07, Bob Dengler <[EMAIL PROTECTED]> wrote:
>
> At 8/30/2007 03:45 PM, you wrote:
> >The Wal Mart effect* makes it to the Communications Feed-Line industry
> >(*Global Economy)
> >
> >enjoy,
> >s.
> >
>
> -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 8/29/2007 06:40 PM, you wrote:
Fred, et al:
The General Electric Datafile Bulletin 10003-1 is available for download
here:
These two files are also needed to perform the calculations:
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Fred Se
At 8/30/2007 03:45 PM, you wrote:
>The Wal Mart effect* makes it to the Communications Feed-Line industry
>(*Global Economy)
>
>enjoy,
>s.
>
>[paste text]
>Building upon the market success of its two most significant cable
>products, Andrew Corporation has announced they will be streamlining
>its l
I wonder what you were using to measure the impedance of the cable with
below .5 MHz?
Some cable especially rg59 types have copper clad steel center conductors.
If the copper clad is very thin low frequencies can penetrate the copper
clad and get into the steel where the loss can go up substantiall
Contains no copper
I live just south of Orland Park, IL (Andrew's old Corporate office) I had
the opportunity a few years back to pick up some LDF5. While on the
property I saw 2 - 30 yard dumpsters side by side by one of the manufacturing
buildings. The 1 dumpster had
--- DCFluX <[EMAIL PROTECTED]> wrote:
> Perhaps they should mark the jacket with 'Contains
> no copper' to
> deture cell site theft as well.
>
>
I think the price of aluminum is up enough also to
make it worth while to scrap. I have heard of reports
of aluminum siding being ripped off.
I have had a 125 Ft. of Andrews
LDF 450 ½ in On My 444.75 Repeater for over 15 Yrs. it actually got
bent a little during a Move I put 3 Popsicle Sticks on it and Tape SWR
Is Still 1.1 , I just wonder if they Switch to alum if it will cause
some kind of reaction of Dissimilar Metals on the Connect
--- Ron Wright <[EMAIL PROTECTED]> wrote:
> Ralph,
>
> I am sure the equation is
>
> Distance (in miles) = Square Root of (2 * height
> >> in feet)
>
> not
>
> Distance (in miles) = Square Root (height in feet).
>
>
Then my refferance (ARRL Antenna Book 1974 version
page 11) must be wro
skipp025 wrote:
> The Wal Mart effect* makes it to the Communications Feed-Line industry
> (*Global Economy)
>
> enjoy,
> s.
>
> [paste text]
> Building upon the market success of its two most significant cable
> products, Andrew Corporation has announced they will be streamlining
> its long
Perhaps they should mark the jacket with 'Contains no copper' to
deture cell site theft as well.
On 8/30/07, skipp025 <[EMAIL PROTECTED]> wrote:
> The Wal Mart effect* makes it to the Communications Feed-Line industry
> (*Global Economy)
>
> enjoy,
> s.
>
> [paste text]
> Building upon the market
The Wal Mart effect* makes it to the Communications Feed-Line industry
(*Global Economy)
enjoy,
s.
[paste text]
Building upon the market success of its two most significant cable
products, Andrew Corporation has announced they will be streamlining
its long-running and market-leading HELIAXï¿
Hi Ron,
Think about what goes on in power and RF transmission. Radiation is a
problem in power distribution just like it is in RF. Propagation down the
line is a concern in power distribution the same as RF.
If you compare 160 meter transmitter/tuner L and C values to those of values
used at 2 me
Ralph,
I am sure the equation is
Distance (in miles) = Square Root of (2 * height
>> in feet)
not
Distance (in miles) = Square Root (height in feet).
>From: Ralph Mowery <[EMAIL PROTECTED]>
>Date: 2007/08/30 Thu PM 12:12:53 CDT
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: Re: [Repea
Bob,
It is better to have someone so one can set down and talk to. This e-mail is
great for bringing the world together, but face to face is much better except
for most of the ugly Hams I hang out with.
The problem with a tuner is the feedline losses, but better than no tuner at
all unless go
We are looking to use a couple of Midland 70-1632B UHF radios to link
to our tower location for interconnect of other repeaters. Any one
know the secret of getting them to go out of band and lock. I have
tried to retune the two pots to 1.5 volts but for some reason they do
not want to stay.
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
--- Ron Wright <[EMAIL PROTECTED]> wrote:
>
>
> >
> >
> >On Aug 30, 2007, at 12:35 AM, ldgelectronics wrote:
> >
> >> As a quick and dirty method, the radio horizon
> is:
> >>
> >> Distance (in miles) = Square Root of (2 * height
> in feet).
> >
>
> This equation is ok, but f
> >> As a quick and dirty method, the radio horizon (RH) is:
> >>
> >> Distance (in miles) = Square Root of (2 * height in feet).
> This equation is ok, but for a perfect spheer. Is a good place to
>start. Here in FL where max altitude is about 330 ft ASL it works
>pretty well although the lo
On that topic I found that a pager works just as well:
http://www.iinc.com/ggcomm/pager.html
Been using one for quite a while now with good results.
Dakota Summerhawk
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of R. K. Brumback
Sent: Thur
--- Joel <[EMAIL PROTECTED]> wrote:
> Ok Skipp, and Jesse,
>
> So, I supposed that the specification of such,
> should be presented by the manufacturers of the
> said, and with the said, right! Or there is a
> general concept for duplexers, as in both examples,
> .1 to 3dB Jesse, and Skipp inpu
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of
Ron Wright
Sent: Thursday, August 30, 2007 11:48 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers
Gary,
Coax also has the
Gary,
I've measured RG59 cable terminated into a 75 Ohm resistive load with a
variable freq impedance meter. We found the coax stopped being 75 Ohms below
about 0.5 MHz. The cable manufacture also verified this. Other engineers in
our department knew of this as well.
We were designing securi
Telewave once told me their TPRD 4 bottle 5 inch duplexer insertion
loss per side... target value is about 1.2 to 1.5 dB per side, which
works out to about 35 watts output with 50 watts input. One can
often see those figures in play out in the real world.
Work with what ever value best describ
Gary,
AC power line transmission theory is very different than RF. In RF radiation
and propagation down the line follows a much different science. Also in AC
lines the load is continously changing and at 60 Hz it takes large Ls and Cs to
make much difference. AC power is more concerned with
Quote: “for between $30 and $150.”
WOW!! Consumer beware………huh
Randy
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of tgundo2003
Sent: Thursday, August 30, 2007 9:30 AM
To: Repeater-Builder@yahoogroups.com
Subject:
>
>
>On Aug 30, 2007, at 12:35 AM, ldgelectronics wrote:
>
>> As a quick and dirty method, the radio horizon is:
>>
>> Distance (in miles) = Square Root of (2 * height in feet).
>
This equation is ok, but for a perfect spheer. Is a good place to start. Here
in FL where max a
Nate,
Totally aggree with you. HAAT, true HAAT, is the real factor. Coverage of a
repeater is determined by HAAT.
I've been told by a repeater owner and users a repeater is say 850 ft high.
Turns out they were giving referenced to ASL and the ground ASL was 800 ft, hi.
Kinda down the same l
Joel,
I aggree the major is the equipment working. If it aint broke don't fix it.
Test gear measurments allow determining the source of a problem if there is a
problem. If your ears say it aint working what is not working and in this case
might not be the duplexer. Yes the test gear measurem
Thanks!!
On 8/30/07, tgundo2003 <[EMAIL PROTECTED]> wrote:
>
> This is a bit off-topic, but I thought it would be important to get
> the word out as life safety is involved...
>
> Tom
> W9SRV
>
> NEWS from CPSC
> U.S. Consumer Product Safety Commission
> Office of Information and Public A
Ok Skipp, and Jesse,
So, I supposed that the specification of such, should be presented by the
manufacturers of the said, and with the said, right! Or there is a general
concept for duplexers, as in both examples, .1 to 3dB Jesse, and Skipp input
loss 15 to 35%
And which will be more accurat
tgundo2003 wrote:
> This is a bit off-topic, but I thought it would be important to get
> the word out as life safety is involved...
>
> Tom
> W9SRV
>
> Firm's Recall Hotline: (800) 203-4921
> CPSC Recall Hotline: (800) 638-2772
> CPSC Media Contact: (301) 504-7908
>
> Weather Radios Recalled b
MCH wrote:
> Which results in OH 'claiming' 30 of the 32 (or 38) available tones.
>
> That leaves 2 or 8 tones for everyone else. Not a particularly fair or
> reasonable plan.
>
> Joe M.
??
--
Jim Barbour
WD8CHL
This is a bit off-topic, but I thought it would be important to get
the word out as life safety is involved...
Tom
W9SRV
NEWS from CPSC
U.S. Consumer Product Safety Commission
Office of Information and Public Affairs
Washington, DC 20207
FOR IMMEDIATE RELEASE
August 29, 2007
Release #07-292
To All Interested: I would invite you attention to a paper presented by Kenneth
Bullington, "Radio Propagation at Frequencies Above 30 Meagcycles" in the
October 1947 Proceedings of the I.R.E. - Waves and Electronics Section. Most
all radio propagation prediction methods over the years have been
On Aug 30, 2007, at 1:20 AM, MCH wrote:
> Height = elevation AMSL of the antenna, HAAT, or AGL (which would make
> no sense)?
I assumed HAAT for my calculations and that number seemed to be the
most sane, after trying a few. But I think the resulting number is
generous for a badly-built rep
On Aug 30, 2007, at 12:35 AM, ldgelectronics wrote:
> As a quick and dirty method, the radio horizon is:
>
> Distance (in miles) = Square Root of (2 * height in feet).
It's a rule of thumb, but isn't nearly as accurate as doing the real
engineering on a system.
> Power and frequency do not re
Height = elevation AMSL of the antenna, HAAT, or AGL (which would make
no sense)?
Joe M.
ldgelectronics wrote:
>
> As a quick and dirty method, the radio horizon is:
>
> Distance (in miles) = Square Root of (2 * height in feet).
Correct!
There is a rule for FCC Commercial radio type acceptance that
radios can not be front panel programmed.
-- Original Message --
Received: Wed, 29 Aug 2007 07:33:03 PM CDT
From: "Bob M." <[EMAIL PROTECTED]>
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: [A
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