I have to stick my nose into this one. Use balanced audio ESPECIALLY if
there is any other strong RF at or near your site. 140 feet is a good
AM broadcast antenna! Shield grounds for your cable should be at one
end (best bet is at the controller for everything!) It also might be
wise to
John,
The professional sound and recording industry addressed this problem long
ago, when wired microphones and other pickups needed to be run several
hundred feet from the performer on stage to the mixing board. We used
balanced twisted pair shielded cable with XLR connectors on each end. A
Just had one on the bench last night, about 3 db hotter than anything else. I
have no info, was told by the guy I got it from that tehre is a GaAsFET in
there. I had this on a Mastr repeater, one cavity ahead of it, it ahead of
duplexer, and at 50 watts into PD526 has zip desense.
GeorgeC
W2DB
In a station, the 9.6 volt circuitry *could* be run from 12 volts, as
long as its regulated. I'm not suggesting someone does that, because
the circuits were optimized for 9.6 volts, but I'm trying to
make a point.
Point taken, but to add to your cautionary note, there are some circuits
I have a odd situation where I need to run long audio cables
between my
repeater controller and two repeaters. In this case, the
repeater controller
will be connected to 2 repeaters in the same cabinette. The other two
repeaters will connected thru about 140 feet of wiring to the
other
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 winter.
I realize a network analyzer
John,
You will save yourself a lot of grief by using real transformer
isolation at each end in addition to balanced lines. The $12 dollar ones at
RS will work fine for communication audio frequencies. If you want to go
first class find some WE111 repeat coils.
For wire CAT 5 will work
Chris -
I have 2 of the HAL ID-1A units that I picked up surplus from a Western NY
utility company last year.
They used these 2 units on their older repeater systems (circa 1970s) -- and
one unit -- was converted
fro 120 VAC to 12 VDC.
YES, they are diode matrix programmed (for ID) -- which
On Sat, 27 Feb 2010, AJ 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 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 this due to the fact that the
Jim,
I performed load tests on many different power supplies, including the
ferroresonant supplies common to Motorola and GE stations. The results are
posted in the Power Supplies folder in the Files section of the
Repeater-Builder Group.
As shown by the efficiency numbers, switchers are far
I vigorously second Jeff's recommendation. This is an application where
iron is still the right answer.
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.
Repeat coils
Hi Jeff,
In general I don't like raising the ground on 7xxx series fixed regulators
by adding diodes to what would normally be the ground lead.
You're right, the diode trick is not recommended. National recommends putting a
voltage divider across the output of the regulator and connecting the
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 difference in twist?
Joe
I will send those specific pages --
How to program Diode matrix and schematic diagram for the HAL ID-1A
to Repeater Builders for posting (access),
The FULL manual is still available for HAL Communications, Urbana, IL
greg
w9gb
Mike, Your comments and help is very much appreciated. You have gone to an
effort to help me greatly and I extend my thanks to you. Great details!
The TPN number is TPN2264 SP01
It has been mentioned to me that the SP could mean either special product or
special price. I haven't actually
Ya, I bought the cable from ebay and I had an old laptop.
I've walked past this stuff for years at hamfests and heard the horror stories.
Motorola did everything they could to make this radio proprietary ..like
everything else.
I even replaced the display caps and some on the audio. blah blah
Then it's not COR [Carrier Operated Relay].
It would be RUS [Receiver UnSquelch].
And running any voice station strictly on PL/DPL is a bad idea.
PL [CTCSS] is prone to falsing if it isn't AND'ed with carrier detect.
I have to figure that DPL is better, but random energy from the 'hiss' has got
Graham,
The SP01 might refer to a power supply that is modified to operate on 230
VAC 50 Hz, or that is fitted with the special Type 1 plug used in New
Zealand, or both. In any case, the SP01 does, in fact, mean that the unit
is a special product that may have been custom-made for a particular
Joe k1ike_m...@... wrote:
I wonder if CAT 6 would be better than CAT5 due to the
difference in twist?
Joe
A number of different items in the specifications would be
worth examining... like how much C per foot and I don't
believe CAT network cables are shielded.
s.
Oz, in DFW wrote:
Skipp, yes you can get shielded Cat 5. I've used it a few times when
running near
AC fixtures etc.
73 John VE3AMZ
- Original Message -
From: skipp025 skipp...@yahoo.com
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, February 27, 2010 10:43 PM
Subject: [Repeater-Builder] Re:
Skipp-
They make Shielded Cat 5 6, as well as shielded RJ45 ends. Takes a special
crimp tool but it is available.
Also, Belden and other wire manufactuers are making special series of Cat
cables with low-skew design specifically for the purposes of sending Audio
Video down the Cat cables.
Shielding is not usually necessary for line level balanced pair audio on CAT 5
or any good twisted pair. CAT 5 is often used in broadcast audio work.
Laryn K8TVZ
--- In Repeater-Builder@yahoogroups.com, skipp025 skipp...@... wrote:
Joe k1ike_mail@ wrote:
I wonder if CAT 6 would be better
Because 900 Mhz is only available to amateurs in the US and not in Japan. The
900 Mhz amateur activity in the US is not very strong.
-- Original Message --
Received: Sat, 27 Feb 2010 07:02:17 PM PST
From: Fuggitaboutit mikew...@hotmail.com
To: Repeater-Builder@yahoogroups.com
SNIP
Why
Hello all,
I've created 2 folders, and uploaded a few files to them They are DB-224 and
DB Antennas. These are for passing along files relating to the Decible DB
antennas.
If the moderators could move some of the other files that are scattered around
the files page, it would make it alot
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 happened.
I prefer to used shielded balanced
At the multi-FM broadcast transmitter site I work at ALL my network wiring is
shielded cat5 or shielded cat6. I have never experienced some of the strange
networking problems related to interference that I occasionally hear others
complain about.
At my studio I had a problem a couple years ago
I think when I made the original post it was late I was tired!!
I work in broadcasting and use the 111C coils often in long analog audio runs
for remote broadcasts. I do agree that transformers would be better than
active balanced devices.
The active devices are easier to deal with for short
I agree!
I just made another post and I definitely agree the transformers are the
better route over active devices for long audio runs. The active devices are
best suited for interfacing un-balanced devices to balanced connections in a
production or control room.
I am thinking of running a
--- In Repeater-Builder@yahoogroups.com, skipp025 skipp...@... wrote:
hybridfan wa6osb@ wrote:
OK, since we've activated the Wy Back Machine again, does
anyone remember the VHF high band West Coast Electronics remote
mount mobiles?
I'm still looking for photos of the
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