I have a choice on where I apply a bandpass filter in the system, and
I don't see a clear winner..
On a 2m repeater, I have a preamp after the cans. I'd like to add a
filter in front of it.
Now I could put the filter between the receive cans and the amp.
The filter then only acts on the
Dave VanHorn wrote:
I have a choice on where I apply a bandpass filter in the system, and
I don't see a clear winner..
On a 2m repeater, I have a preamp after the cans. I'd like to add a
filter in front of it.
Now I could put the filter between the receive cans and the amp.
The filter then
Dave VanHorn wrote:
You've got a big project there.
What is it exactly that you're looking to learn?
I need som good reference about passive filters. I have Eagleware Genesys
software, but everything i simulate i do not get so much usable results.
I'm asking, because you seem to want to take
Does anyone have a pointer to a doc that translates Johnson Call guard
numbers to PL tone frequencies?
Thanks!
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I've seen gensets and air compressors here in NY, I was told by the
crew of the crane they mostly did it to
keep the cable tensioned on the crane, any kink overnight was difficult
to deal with the next day. not doing it
made for some bumpy lifts which can add some excitment that they really
Dave VanHorn [EMAIL PROTECTED] wrote:
I have a choice on where I apply a bandpass filter
in the system, and I don't see a clear winner..
There isn't one unless you need the filter. Kevin replied
to ask what the filter bandwidth was, which is one part
of the bigger picture we might need to
Dave VanHorn wrote:
The Amateur radio handbook, published by the ARRL in the USA, is a
pretty good source.
I got some old CD...will take a look for a newer...
Them's fightin' words! :) I'm a long time Atmel AVR guy.
I've used PICs but the banking and holes in the memory drive me
nuts.
.. I'd like to add a filter in front of it.
Do you need it?
Not sure yet. I'll know when I get up there with the SA, so I can
see what's coming down the pipe.
I'm just gaming out my options.
You know the old saying... if it works don't mess
with it..?
Yes, and it's about
At 1/11/2006 11:09 AM, you wrote:
You know the old saying... if it works don't mess
with it..? If you really don't need the bp filter,
don't bother. The extra loss and potential for problems
from coax - connector joints, junctions and extra
hardware just might shoot your repeater in the foot
--- In Repeater-Builder@yahoogroups.com, Dave VanHorn [EMAIL PROTECTED]
wrote:
Does anyone have a pointer to a doc that translates Johnson Call
guard
numbers to PL tone frequencies?
Nevermind, thanks, I found it..
I have it in a one-page PDF, if anyone's interested.
Yahoo! Groups
Send it to me and I'll upload it to the Johnson section of RBTIP
Dave VanHorn wrote:
I have it in a one-page PDF, if anyone's interested.
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Back around 1990, we were having a problem on VHF with an interfering signal
that drifted ever so slowly back and forth across 2-Meters and the VHF business
band. One of the radio techs in our radio shop had a 2-Meter Repeater nearby,
which would wind up being keyed up for long periods of time
Very Interesting
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Got a small question, I have recently been given a pair of 12 v BAT_0103
batteries. These are sealed lead acid cell (UPS) and are 75 amp hr. I am
currently using a pair of car batteries as battery back-up. Are the sealed
ones better to use or does it make no difference. The GE power supply will
OK I found exactly what I was looking for. No good for my needs (high
TX low rx), so back on the shelf it goes for another project
73
Andy KC2GOW
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At 03:58 PM 2006-01-11 -0600, you wrote:
Very Interesting
Agreed. Anecdotes like this are always worth reading.
An excellent means of passing knowledge down the generations.
Tony (a newbieish ham)
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Everything depends on everything Bob. I've seen some
poor quality N elbows that ruined an 800MHz trunking
system (round body type). Replacing the round body
elbows with the better made square body N-Elbow brought
the trunking system rx pre-selector back to life.
Not only can the mechnical
Even though it's configured for operation that way,
you might be able to swap the coax jumpers around (if
they're different) and get it to tune properly anyway.
Worth a try. It's not doing you any good right now, so
what have you got to lose except an hour on the bench
with a spectrum analyzer.
At 1/11/2006 02:38 PM, you wrote:
Everything depends on everything Bob. I've seen some
poor quality N elbows that ruined an 800MHz trunking
system (round body type). Replacing the round body
elbows with the better made square body N-Elbow brought
the trunking system rx pre-selector back to life.
The quick story... circa early mid 1980's
Motorola had just put a brand new 800MHz trunking
system on the air from above San Jose on Monument
Peak with what appeared to be really numb receivers.
an $80,000 boat anchor...
A group of us mountain top types were called to
fix the problem.
At 12:58 AM 1/12/2006 -, you wrote:
Don't know much about their physical construction but
I have seen connectors with springs for conductors,
which I know can't be good news.
---When I first got into EME work, I heard of another EME op who used
Radio Shack right-angle adapters, which use
The extra loss and potential for problems
from coax - connector joints, junctions and extra
hardware just might shoot your repeater in the foot
type thing. A generic rule of thumb might assume each
coax connector is about .2 dB of loss added to the
system.
You know, has
Greetings,
I have several RCA 700 UHF mobile transceivers available in Nashville, TN.
These were working when they were removed from service years ago. These
radios would be good for making repeater link radios, IRLP or EchoLink
nodes, or as the Tx Rx strips for repeaters, or perhaps putting a
Hello,
Another funny interference story, I may have put it on here before but it
bears repeating. One of the Police repeaters in the area that the shop I
worked for and maintained was getting a stable, slightly off-frequency
signal modulated with a 1000 Hz tone but without CTCSS. It did not key
I concur... This is one of the most interesting groups I've had the pleasure
of participating in. Indeed, a rare collection of talent in this group.
Fairly new to the world of repeaters,
Richard, N7TGB
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED]
- Original Message -
From: Paul Finch [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, January 11, 2006 9:53 PM
Subject: RE: [Repeater-Builder] OT - funny interference story
Anyone know who this Guy is? He is also famous for the power supplies
he builds.
Hello again,
I am working on a weird interference problem right now for that matter, it's
been going on for two weeks or so. I have a customer that I maintain a 800
MHz LTR Trunk system for. One of the receivers is getting a stable dead
carrier signal 2.5 KHz high in frequency. It is
Charles,
No, it is a Walt though and he's not a SK.
Paul
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of Charles Miller
Sent: Wednesday, January 11, 2006 10:27 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] OT -
what state are you in?
- Original Message -
From: Paul Finch [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, January 12, 2006 12:13 AM
Subject: [Repeater-Builder] OT - NOW NOT SO funny interference story
Hello again,
I am working on a weird interference
h Walt Whitman?
Paul Finch wrote:
Hello,
Another funny interference story, I may have put it on here before but it
bears repeating. One of the Police repeaters in the area that the shop I
worked for and maintained was getting a stable, slightly off-frequency
signal modulated with a
At 1/11/2006 13:48, you wrote:
We then went to the apartment across the hall. No one was home, so the
apartment Manager opened the door with his master key, and we all went in.
The first thing we tried was unplugging the aquarium heater, since they're
often such a terrible electrical noise
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