Hi All,
I am trying to build a circuit to roll of the discriminator audio
coming out of my UHF Mastr II receiver. I have one of those
controllers that does smart squelch by paying attention to the high
frequency noise and it seems the Mastr II receiver does not have
adequate filtering to stop
atms169 wrote:
Hey guys, I'm trying to find radiation patterns or a calculator to see
what would be the best possible coverage for our repeater.
There's a number of calculators on the web, and some good links in the
RB website for Excel spreadsheets where you can see the math if you like.
We
Yes, this is a good point to mention. However, it would become painfully
obvious at some point.
Chuck
WB2EDV
- Original Message -
From: Laryn Lohman [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, May 30, 2008 11:18 PM
Subject: [Repeater-Builder] Re: Weather
At 50 ft HAAT, which looks as what you have, 10 mi ideal situation
coverage (dist=(sq root (2 x 50)).
A good DB224 or fiberglass like the RFS 220 or Telewave ANT150F6-2 (I am
assuming 2 m) would give good coverage of what you have. Feed line 1/2
heliax a min. At this run going to larger
Performance wise, given the same gain, they will perform the same. However,
the folded dipole array will hold up to a lightning strike and I've never
seen a fiberglass antenna survive one.
Chuck
WB2EDV
- Original Message -
From: atms169 [EMAIL PROTECTED]
To:
Mark,
Not sure what the manufacture is talking about.
I think your problem is at the audio level, not 455 kHz.
Sounds as if you are taking de-emphasised audio which has a roll up of 6
db/octive...with same deviation coming in as you double the mod freq you
double the amplitude. This give
One other comment.
If at only 50 ft and this is where you plan staying for a while I would
go with one of the Diamond or Comet longer dual banders. They do
work...just not as rugged and lots cheaper than folded dipoles or RFS
220.
Normally I would not recommed this except you are low,
For 2 minutes I would think a weather alert would be more helpful than
what the net was covering. All should hear the weather alert in most
all cases.
73, ron, n9ee/r
Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.
Hi Nate
we tryed the SD222-SF3PASNM and we find it quite directionnal i must say.
the SD212-HF2P2SNM has been my antenna for 5 years and never failed me and
since we are in salted air region they are well built too.
in fact my other repeater will have this antenna and remember too that the
oh Chuck
after our test here we found also that Fiberglass seems to catch static much
more then metal antenna,
you need a good protection for that.
another to be added!!!
and the angle of radiationdont remember if it was mention in some email???
ok bye for now,qsy at the shuttle
Depending on the circumstances, we'll probably turn the receiver off during
a weather net and let the net control pass the info on. OTOH, it'd be easy
enough to switch in a voltage divider to allow two different audio levels.
P.S. The club may be passing the hat to buy a WX-200 from CAT
Does anyone know anything about this thing? It has a transistor in it
- NEC 74030. Google can't find either. Looking at it on the
scope...looks to have something like 12,14,16 db gain? Could be wrong
on that.
Thanks,
Robert
I am actually working on this, this weekend. I am going to set the
WX alert to interupt all traffic, but, use a simple * to shut it up,
also since I can now tell weather it is a watch, warning, or
statement from the alarm inputs, I may let a statement or watch get
recorded and played when
Robert,
That amplifier is a component of a Sinclair RM series UHF multicoupler. The
RM units comprise a 2U rackmount tray with an FP series compact preselector,
an A series preamplifier, a small 12 VDC power supply, and a hybrid power
divider providing 2, 4, 8, or 12 separate outputs. The gain
Please do!
Mike
WM4B
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of ks4ec
Sent: Saturday, May 31, 2008 10:59 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Weather Receivers - follow up
I am actually working on this, this
I acquired a number of UHF Micor unified chassis stations, with the
intention of converting at least one to GMRS duty. They are in numerous
states of disassembly - some are complete chassis less the cards, other have
had modules removed, etc. I did get a box of various station cards and at
least
Being in Nebraska - near, if not in, tornado alley - weather events have had a
high priority on our repeater.
When our machine first went on the air 30 years ago it was a primary means to
relay real-time spotter information from the field to our local National
Weather Service (NWS). It was
what city and state are you in?
John
- Original Message -
From: n9wys
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, May 31, 2008 11:13 AM
Subject: [Repeater-Builder] Micor Unified Chassis
I acquired a number of UHF Micor unified chassis stations, with the
The duplexer I said was NG for 2 meters is 4 cans, but doing some
preliminary tests indicate it can tune in the 440 band. I checked for
lowest SWR in the VHF area, then for lowest in the UHF area.
IT does seem to work, and has what looks like good steep skirts testing
this way.
These
Just outside Chicago.
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Maire-Radios
Sent: Saturday, May 31, 2008 10:42 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Micor Unified Chassis
what city and state are you in?
John
If you can stand to wait until early next week... I'll try to
provide you with a basic circuit. Otherwise you can check at
places like the www.repeater-builder.com web site for some ideas.
cheers,
skipp
Tyson S. [EMAIL PROTECTED] wrote:
I am trying to build an interface to connect a
after our test here we found also that Fiberglass seems to
catch static much more then metal antenna.
Static is not exclusive to one type of antenna... I've had
and heard some real train-wreck stories about placing antennas
in classic high desert and hot/dry locations where the wind
Thanks, I have been trying to figure this out for a year now so a week more is
certainly not a problem! I found some schematics for PTT/hang timer type
circuits but they are all based on being connected to a signal line that
switches from 0v to 5v when the receiver becomes active, it appears
A couple of observations:
Same gain - same coverage. Fiberglass encased or exposed dipole - 5.8
dBd = 5.8 dBd - this is about the max you can expect from a 2M antenna
before the law of diminishing returns kicks in. More Gain for BUCKS
- look at a DB228 - 40 some odd ft long exposed
wish you was in Florida as I got a number of the repeaters I would like to get
out of here at a low cost.
- Original Message -
From: n9wys
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, May 31, 2008 12:35 PM
Subject: RE: [Repeater-Builder] Micor Unified Chassis
Hello Ron,
The audio emphasis for FM is a different issue. When I put the
discriminator output from the Mastr II receiver on a analyzer you can
clearly see a spike way out at 455khz which I believe is the IF
frequency in the receiver.
This controller has a auto-squelch feature (it does not use
Thanks. Your results are encouraging! The duplexers I have are notch type and
like yours only have one connector with a tee.
73 and aloha, Eric KH6CQ
--- On Sat, 5/31/08, Wayne [EMAIL PROTECTED] wrote:
From: Wayne [EMAIL PROTECTED]
Subject: Re: [Repeater-Builder] GE Radios to sale
To:
At 08:27 AM 05/31/08, you wrote:
Being in Nebraska - near, if not in, tornado alley - weather events
have had a high priority on our repeater.
When our machine first went on the air 30 years ago it was a primary
means to relay real-time spotter information from the field to our
local
At 11:33 PM 05/30/08, you wrote:
Hi All,
I am trying to build a circuit to roll of the discriminator audio
coming out of my UHF Mastr II receiver. I have one of those
controllers that does smart squelch by paying attention to the high
frequency noise and it seems the Mastr II receiver does not
does any have or could send me to the link of the current list the FCC has for
the band from 460 to 470 with the 6.25 set up list?
thanks John
I am near Florida. How cheap you want to get rid of them?
Collin
-Original Message-
From: Maire-Radios [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sat, 31 May 2008 3:38 pm
Subject: Re: [Repeater-Builder] Micor Unified Chassis
wish you was in Florida as I got a
Just use a simple inverter circuit.
Take an NPN transistor, ground the emitter.
Run a 10K resistor from the base to your input signal.
Run a 4.7K or a 10K from the collector to +5. The collector is your
inverted input.
We don't have a basic logic circuits page at repeater builder, so I can't
Hey guys,
Scott here. I found a very interesting way for me to run my repeater
considering I am blind. Has anyone used the Echolink Station software?
That will alleviate a lot of work on my end for the repeater cause since I
don't have eyes that will be a lot less soldering for this boy. I
for a PS you can uses a Mastr II power supply
make sure you take out the switch / receptacle panel and bend switch terminals
to eliminate possibility of shorts to rear of compartment
http://www.repeater-builder.com/ge/mastrii/mastr2arcing.html
Gary
- Original Message -
From:
yes
the 'Control and Application' is the one you really need
but the others will be useful in the long run
examine the rear of the back-plane of the control shelf carefully for factory
mods before you start; if there is anything 'SP' about it, that's usually where
you will find it, in the
Yes, I have spent a lot. It's a Dstar repeater.
--- In Repeater-Builder@yahoogroups.com, Ron Wright [EMAIL PROTECTED] wrote:
At 50 ft HAAT, which looks as what you have, 10 mi ideal situation
coverage (dist=(sq root (2 x 50)).
A good DB224 or fiberglass like the RFS 220 or Telewave
It's the KE5KAF Dstar system in Laredo.
2 Meters
120 watts after duplexers
Telawave 4 cans 600 Split
Coax LMR-400 80feet
Antenna I want to put up is a Commercial Anitron-150 Similar to a DB220
--- In Repeater-Builder@yahoogroups.com, Nate Duehr [EMAIL PROTECTED] wrote:
atms169 wrote:
Hey
Mark,
Could you describe EXACTLY where on the MASTR II you are pulling audio
from and what type of audio (discriminator/pre-emphasized or regular/
de-emphasized) your voter is expecting?
Like everyone else who's responded so far, I've never seen and extra
audio from the IF of a MASTR II
Shame you can only get up to 50 ft. D-Star is exciting mode and the
telewave 4 can duplexer is good. I would consider something other than
the LMR400 for with their dis-similar double shields it can cause noise.
I would seriously consider 1/2 heliax and 80 ft will not be big
investment.
what are you looking for and I will let you know.
John
- Original Message -
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, May 31, 2008 5:59 PM
Subject: Re: [Repeater-Builder] Micor Unified Chassis
I am near Florida. How cheap you want to
At 5/31/2008 13:55, you wrote:
Hello Ron,
The audio emphasis for FM is a different issue. When I put the
discriminator output from the Mastr II receiver on a analyzer you can
clearly see a spike way out at 455khz which I believe is the IF
frequency in the receiver.
This controller has a
Well as you know, one is never satisfied with their own repeater.
Always wanting to have better!
Yes, the Dstar system is great. I am changing the fiberglass vertical
to the Anitron-150 which is a set of folded dipoles.
I'm running a TE Systems PA and a Chip Angle preamp.
Yes, 50 feet sucks
Whenever I've looked at the (properly set) TS-64 output coming out of a
MASTR II, it has looked clean... the level is probably just set too high
on the exciter so you're hearing it.
Well I haven't scoped it yet. What drew my attention to it was the
service monitor. When I keyed the TX there it
Just use a simple inverter circuit.
Take an NPN transistor, ground the emitter.
Run a 10K resistor from the base to your input
signal. Run a 4.7K or a 10K from the collector
to +5. The collector is your inverted input.
We don't have a basic logic circuits page at
repeater builder
Doug wrote:
Whenever I've looked at the (properly set) TS-64 output coming out of a
MASTR II, it has looked clean... the level is probably just set too high
on the exciter so you're hearing it.
Well I haven't scoped it yet. What drew my attention to it was the
service monitor. When I keyed
Usually the fiberglass antennas don't like swaying in the wind. If one
does not have a top mount and the wind picks up the antenna starts to
wip around and cause noise. The folded dipoles normally do not have
this problem.
I like providing a top mount on a fiberglass, something not easily
Same gain - same coverage. Fiberglass encased or exposed
dipole - 5.8 dBd = 5.8 dBd - this is about the max you can
expect from a 2M antenna before the law of diminishing
returns kicks in. More Gain for BUCKS
An Amen is heard from the crowd...
- look at a DB228 - 40 some odd ft
I have two UHF mobile duplexers. One from, supposedly, a Motorola,
and had been tuned down to the 440 band, the other I stripped from a
garbage Motorola unit, have not tried retuning it.
Either would be good for up to 50 watts, but maybe not much more.
And they can be had fairly cheap when
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