Eric makes a very important point here. I have found in several cases that the
placement of the filter capacitor in a circuit makes a great deal of difference
in its effectiveness.
For instance, in one case we were using a simple transformer/rectifier/filter
cap power supply on the low
Motorola p/n TLD9640B obviously an SWR sensor of some sort, N
connectors, and 2 RCA jacks labeled forward and reverse.
So I know it is an SWR sensor of some sort.
Looking for Info on frequency and power rating?
Any Help Appreciated.
Here is my setup:
UHF Vertex VXR7000 in / out port A
VHF Vertex VXR7000 in / out port B
FF800 controller
both repeaters are wired identical, and are using carrier sense and PL
Detecct (active Low) to key up the controller.
I have situation where after a user unkeys, I get a chopping burst for
In my case, without an antenna there was no way to key it up - HI
73 - Jim W5ZIT
Nate Duehr [EMAIL PROTECTED] wrote:
On Apr 22, 2008, at 12:56 PM, Jim Brown wrote:
Mine was on the air - but not active at the time the ax was applied
to the hard line. You
I finally received my Dayton tickets this weekend. Whew, I was beginning to
wonder!
Bill - WA0CBW
**Need a new ride? Check out the largest site for U.S. used car
listings at AOL Autos.
(http://autos.aol.com/used?NCID=aolcmp0030002851)
Direct from Motorola's parts website:
1. Item Number. TLD9640B * Item has been cancelled
WATTMETTER VHF
Not sure if that helps - not much information provided by Motorola...
but at least now you know the band.
Mark - N9WYS
-Original Message-
From:
The Motorola TLD9640B, described as Wattmeter VHF in the catalog, was only
recently cancelled. I suspect that it is a Telewave PA-2A-300 RF Power
Monitor. Go here for info:
www.telewave.com/pdf/TWDS-3015.pdf
73, Eric Lemmon WB6FLY
-Original Message-
From:
Ooops! How about PM-2A-300? I mis-typed.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Eric Lemmon
Sent: Monday, April 28, 2008 7:10 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder]
Jim,
It sounds as if the added filter cap was an RF or high freq related
problem/solution.
Often where a bypass cap is placed on a PCB can affect it function in reducing
noise.
When trying to fix a hum or other noise problem it is best to determine the
cause and then the solution. In your
Thanks!
I think you have put me in the ballpark, although what I have looks
different, I will post a photo to the list tonight.
--- In Repeater-Builder@yahoogroups.com, Eric Lemmon [EMAIL PROTECTED]
wrote:
Ooops! How about PM-2A-300? I mis-typed.
73, Eric Lemmon WB6FLY
-Original
At 4/27/2008 19:19, you wrote:
Ok. Put the little op-amp together via the Repeater Builder website.
http://www.repeater-builder.com/rbtip/audioamp.htmlhttp://www.repeater-builder.com/rbtip/audioamp.html
The LM386 is not an op amp. It is an audio power amplifier with a nominal
gain of 26 dB.
The circuit on the audioamp web page is a speaker monitor amp.
Look here:
http://www.repeater-builder.com/tech-info/op-amp-design-reference.pdf
Set aside an hour or so and read that, and you will have a much
better mental handle on the whole op-amp concept.
Mike WA6ILQ
At 07:19 PM 04/27/08,
MOTOROLA ELECTRONICS TEST KIT on E-bay appears to have Micor cable with it.
Item number: 260234370700
http://cgi.ebay.com/MOTOROLA-ELECTRONICS-TEST-KIT_W0QQitemZ260234370700QQihZ016QQcategoryZ71574QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I have nothing to do with this sale just passing it along.
The radio audio input is probably a higher level because of the
electret cartridge inside the mic. And some mics might also have
a small preamplifier stages inside. I would guess the electret
cartridge first and maybe followed with a preamplifier stage...
Mototorola does it on some of their
georgiaskywarn [EMAIL PROTECTED] wrote:
Ok. Put the little op-amp together via the Repeater Builder
website. http://www.repeater-builder.com/rbtip/audioamp.html
I did the one with the 15k resistor and .0047uf cap. Couldn't
tell you what pot I used. Grabbed one and threw it on. Going
to
Bears the markings KM4OI Audio process board, has an LM1036n, three
adjustment pots (bourns), several caps and resistors.
Thanks
Robert,
Haste in creating a soultion to a problem such as this often results in
frustration.
Years ago, I damaged a piece of equipment in much the same way you did here,
looking for a place to tack-solder a lead that would allow me to interface
to COS. Had I started with a schematic, and found
There are several Internet sites, including www.mods.dk, that have
downloadable schematics for the ADI AR-247. I found them by doing a Google
search for ADI 247 schematic.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On
Hi Paul (and everyone else that has responded),
Thanks for the replies.
You mentioning about damaging equipment was exactly why I didn't
finish this project back at the end of the summer. Instead of using
my magnifying light / glass...I tried changing the ctcss or the cos
point (can't remember
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