I have some micor repeaters with the Factory encode boards. I would like to
make them half duplex. I can not get the board to transmit pl encode on ptt/mic
or local. I see the pl on the scope on the exciter but not out the audio path.
Any ideas?? Good thing i have manual or i would be lost. I
Hi all..I want to build a VHF repeater with two Motorola M120s..I have the
sixteen pin interface cables and have made a dual mount box and power supply for
them..Do I need other software apart from the norm M120 programming software and
do I need any other hardware..Help would be much
I wonder what the diameter of the center element, or plunger, was?
I think I still have one with the rivets drilled out, I'll measure when I
get a chance.
--- Jeff WN3A
I need to interface a link receiver (Icom F221S) with an ACC RC-850.
This presents two problems. First, the Icom receiver uses active low
COS, and the RC-850 doesn't seem to have a means to select the sense
of a link receiver. The repeater receiver (Midland BaseTech II) uses
active high COS.
Hey,
The reverse of polarity is very simply achieved by using a one transistor stage
that will invert the input signal. For the audio boost use a TL071 opamp stage
circuit.
If you need further assistance please provide some documentation (schematic or
other relevant material) because I
I wonder if it is a noise floor problem. How does it act on a service
monitor when it is not hooked to an antenna picking up high levels of noise?
tom
[Original Message]
From: Adam Feuer feu...@optonline.net
To: Repeater-Builder@yahoogroups.com
Date: 7/12/2009 7:30:11 AM
Subject: Re:
I have a few old Radio Shack engineer handbooks that have a wealth of these
circuits,
'cause I can never remember them. However, they are packed away still after
moving.
This site : http://www.kpsec.freeuk.com/trancirc.htm Seems to have
mosteverything you'll need to invert the COS.
You can either build a COS inverter or use an aftermarket squelch
board. Also you can try the LM386 amplifier for the audio.
See the following:
http://www.repeater-builder.com/pix/cosinverter2.gif
http://www.repeater-builder.com/projects/remotebasecos.html
Here are a couple of simple circuits to do what you want. Use a well filtered
source of +V for the audio amplifier to keep from developing some hum on the
output. Any voltage source from +5 to +12 should work. Adjust the variable
resistor to set the gain of the audio amplifier.
73 - Jim
Hi Everyone,
I'm thinking about buying a used service monitor for various projects,
and I've come across a few units that look good (from a price point) but
I can't find any data on them.
1) Racal Dana 6113G Digital Radio Test Set Service Monitor
2) Cushman CE-4000
3) HP 8924C
4) Ramsey COM3
The 8924c is nice. I have one of those. The 8920b manual will be of help
with that unit.
I've owned a com3. Was quick and easy but less featured, and less
expensive.
Chris
Kb0wlf
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
buil...@yahoogroups.com] On
Hi Eric
Sorry to bother you, but the link for the harness drawings didn't work. Can you
e-mail to me or can I not find this info on the repeater builders web page?
Thanks.
De N5NPO n5...@hotmail.com
Norm
- Original Message -
From: Repeater-Builder@yahoogroups.com
The OD of the center conductor on a TX-RX 4 diameter 900 MHz cavity is
0.877 (probably 7/8 before silver-plating). It tapers slightly where the
fingers are cut into the bottom (open) end to grip the plunger.
The plunger will recede far enough up into the center conductor to allow for
resonance
The OD of the center conductor on a TX-RX 4 diameter 900 MHz cavity is
0.877 (probably 7/8 before silver-plating). It tapers slightly where the
fingers are cut into the bottom (open) end to grip the plunger.
The plunger will recede far enough up into the center conductor to allow for
resonance
Razvan, Eric, DCFlux, Jim,
Thanks for the great response. I think I can proceed with the info you
have provided. I should be able to build the simple circuits. Thanks.
What a great thing this RB!
John
This message was checked by NOD32 antivirus system.
http://www.eset.com
I'm considering selling my IFR 1200S. If anyone is interested, please email me
direct - don at httpd.org.
If you're interested in a ball park selling price for a monitor of this
caliber, google IFR 1200S and see what the going prices are these days.
The last time I tried this, I had a ham
--- In Repeater-Builder@yahoogroups.com, Thomas Oliver tsoli...@... wrote:
Tom, the receiver and squelch appear to operate normally when using a service
monitor to generate signal. Noise floor issues can certainly be a problem,
although a Motrac receiver works fine on the same exact antenna.
I guess I would then use the Motrac receiver for the time being.
tom
[Original Message]
From: kq2h k...@yahoo.com
To: Repeater-Builder@yahoogroups.com
Date: 7/13/2009 8:52:26 PM
Subject: [Repeater-Builder] Re: Micor Bi-Level Squelch Circuit
--- In Repeater-Builder@yahoogroups.com, Thomas
Thanks for the responses so far. I didn't mean to incide a war over this, but
the going rate for an IFR 1200S is around $4,000 - the reason I'm looking for a
less expensive option.
If anyone can speak about Cushman monitors (the 4000) I have a lead on one of
those. Otherwise, I'll try my luck
--- In Repeater-Builder@yahoogroups.com, Nick w7...@... wrote:
I have some micor repeaters with the Factory encode boards. I would like to
make them half duplex. I can not get the board to transmit pl encode on
ptt/mic or local. I see the pl on the scope on the exciter but not out the
Norm,
That's really odd- the link works fine from both home and work computers.
Nevertheless, I have sent you the file directly.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of NORM KNAPP
Sent:
The tiny URL link didn't work for me either. (I don't need it, just
reporting the problem)
Chuck
WB2EDV
- Original Message -
From: Eric Lemmon wb6...@verizon.net
To: Repeater-Builder@yahoogroups.com
Sent: Monday, July 13, 2009 10:21 PM
Subject: RE: [Repeater-Builder] Notch on
Thank you Eric.
I keep getting error 404 file not found.
Oh well. No problem, I got the PDF.
I will take a picture of the Frankenstien Q-202 and send it to you before I
replace the harness. This repeater actually belongs to The Mobile Amamteur
Radio Club. I am just the technical force behind it
I'd be leaning toward an HP. Even if you have to pay a little more up
front, you'll come out ahead of the game in the long run. I have three HP's
(two 8920B's and an 8921A, with various options), and in the last ten years
or so, only once have I had to get one of them repaired (spectrum
I am going to have a Motorola box for sale shortly that needs a little work and
calibration Email me offthe list if you want information. It is a model
2210B. it is not dead only has a minor problem in the generate mode with the
fine attenuator control. Like a scratchy pot.
If you do opt to get an IFR and it has the high stability oscillator
option, make sure it works properly. I have a bad IFR1200 here that the
heater on the oscillator crapped out. The service monitor works, but it
is way off frequency and can't be adjusted. The last time I priced
repair, it
option, make sure it works properly. I have a bad IFR1200
here that the
heater on the oscillator crapped out. The service monitor
works, but it
is way off frequency and can't be adjusted. The last time I priced
repair, it was in the $1,000+ range.
73, Joe, K1ike
Joe,
You've
Let me add my 2 cents
I have some rubidium oscillators for sale
If interested - off line: com-...@com-rad.com
ED K9QPJ
- Original Message -
From: Jeff DePolo
To: Repeater-Builder@yahoogroups.com
Sent: Monday, July 13, 2009 10:07 PM
Subject: RE: [Repeater-Builder] Re:
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