Here in Australia all the digital stations are somewhat lower power than
the analogs, so as far as interference to your receivers goes, that may
be a saving grace.
I would imagine that if you live near a TV station that your front ends
will need to have pretty good on intermod performance (I don't
Know Chip well, see him every year at the Cactus Meetings. Great preamp
but cost $110. Would be nice to find a 10-15 db easy to make preamp for
440mhz.
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=actionkey=PR-SERIES
Great for sites that don't require pre-selection ahead
Repeater Builder5a.
Re: digital TV channels
Posted by: MCH m...@nb.net ncc74656_uss_voyager
Sat Jan 10, 2009 7:45 pm (PST)
That was the original plan, but the TV industry whined about losing
them, so they are back in the TV lineup. There is a CH 2 DTV station in
Harrisburg, PA.
I would
Hello Group,
A week or so ago, I believe I read on this list, that someone said the CERT
groups were allowed to
apply for Commercial radio channel(s). Here, on Vashon Island, Wa., we have
over 100 CERT members. They are using FRS radios in the field. It makes it
very difficult for our EOC to
Any group can apply for a commercial band repeater and use it, licensing can
be expensive for commercial frequencies though. What we use is MURS for the
non hams and then the team leaders are hams and relay the information back
to the CP. Might look into seeing if your public service has a
Tim,
Your community public works, police, EOC, and/or fire department are a good
place to start. An
established public safety agency will have far less trouble getting such a
license and, it's often
at no cost because public agencies are exempt from fees for Part 90 licenses.
Everything can be
re: Ramsey Rx Preamplifier Kits.
Kevin Custer kug...@... wrote:
Great for sites that don't require pre-selection ahead of
the preamp.
Kevin
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=actionkey=PR-SERIES
Excellente' lead...
Couldn't ask for a more practical
On Wed, 7 Jan 2009, Chuck Kelsey wrote:
How can I identify an otherwise unknown tower as Rohn 20, 25, 45, etc.
or even another tower manufacturer altogether?
I'm printing off the Rohn 25, 45, and 55 section details, but beyond
those drawings, I've no other clues to ID the tower.
Chuck that looks like a Ham Ant beam, Do You know who the Person was
that owned it , They might know
Good Luck
Don KA9QJG
At 1/11/2009 06:12, you wrote:
Correct, here is the order info sheet from the wayback machine
73, Joe, K1ike
OK, is it just me or is there NO noise figure spec. in any of these documents?
My guess is that the GLB preselector consists of the filter followed by the
preamp. Also because of
The specifications for digital out of channel noise are tighter than for
analog. Also, digital is generally running less power than analog, so the
combination of the two should spell much LESS interference on 6m from a channel
2 digital transmitter.
Hap Griffin
VP - Engineering
SCETV
-
The DTV mask specifications are tighter for digital than for analog for out of
channel noise. In fact, it takes a special setup to even measure it since
spectrum analyzers generally don't have the dynamic range to measure it
directly.
Hap Griffin WZ4O
VP - Engineering
SCETV
- Original
It certainly looks like Rohn 45.
Randy
--- In Repeater-Builder@yahoogroups.com, Kris Kirby k...@... wrote:
On Wed, 7 Jan 2009, Chuck Kelsey wrote:
How can I identify an otherwise unknown tower as Rohn 20, 25,
45, etc.
or even another tower manufacturer altogether?
I'm
It appears to be a 45G, some of which is in not so good condition.
Depending on how bad the rust is on the upper part, it might not have much
life left. Almost looks like the bottom may have already been painted at one
time.
Chuck
WB2EDV
- Original Message -
From: Kris Kirby
At the risk of dragging this OT thread out a little further, I have a tech
question. I need to order a number of converter boxes to use as emergency
alert system (EAS) receivers (just using the left/right audio outputs, don't
care about video). I need to find boxes that will power up
At the risk of dragging this OT thread out a little further, I have a tech
question. I need to order a number of converter boxes to use as emergency
alert system (EAS) receivers (just using the left/right audio outputs,
don't
care about video). I need to find boxes that will power up
Jeff, you can do that with a $3 microcontroller easily. PVT me if you
need some help.
If you're hinting at sending IR to turn the box on, and change to the
desired channel, after the power failure, I thought of that, but I'm looking
for an off-the-shelf solution.
If you're hinting at sending IR to turn the box on, and change to the
desired channel, after the power failure, I thought of that, but I'm
looking
for an off-the-shelf solution.
This is something that needs to be done only once (for all the boxes)
and replicated. If you need any help
http://www.fda.gov/cdrh/medsun/AudioConf_files/MedicalTelemetryWireless/Lessons_learned.pdf
Ray KB0STN
- Original Message -
From: Hap Griffin
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, January 11, 2009 4:58 PM
Subject: Re: [Repeater-Builder] DTV
Kris is who was looking to identify it.
Chuck
- Original Message -
From: Don Kupferschmidt d...@httpd.org
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, January 11, 2009 8:43 PM
Subject: Re: [Repeater-Builder] Tower Identification
Chuck,
I have a rohn tower at my dad's house
Re CERT licensing -
If the organization is an association or a corporation, like a club or a public
service group, you can license on a commercial frequency. You will have to go
with Narrowband though. Wideband channels just are not available on Vashon
Island since you are near the Canadian
I have three of these preamps in service on GE Mastr II 440 repeaters.
The tuned circuit in front of the transistor will help a bit
with out of band signals.
I build a shield from galvanized flashing and put it around the two turn front
end coil. I use these preamps installed in the normal
Re: GLB Preamplifier
n...@... wrote:
OK, is it just me or is there NO noise figure spec. in any
of these documents?
The Philips data sheets give typical noise figures for the BF981
as 0.7 dB at 200 MHz and 0.6 dB at 600 MHz. Curves are provided
for determining the source admittance
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