On Nov 25, 2009, at 10:18 PM, skipp025 wrote:
The system used Multicast IP (mistake number one), UDP (maybe
mistake number two),
Both Multicast and UDP are not to blame... someone didn't
engineer the system properly.
That was my point.
and when I said, Unplug the Ethernet jack
I now have a Pass/Reject Duplexer Coming To me for my GMRS Project.
A nice guy from the forums here is swapping one to me for my LPB 8ch mono
broadcast board.
but due to the fact i may be moving to alabama soon, it will be official on
dec. 1st. the repeater obviously will not be in the
Okay, so you have a 5 MHz split instead of a 600 kHz split- that makes it
much easier. I like to use two 8 bandpass cavities, simply because they
will fit in a 19 rack and provide maximum performance. I have three
commercial UHF MTR2000 repeaters on the air now, each with two Telewave 8
bandpass
I have been following the post on receiver preamps. I would like to expand the
topic to D-Star repeaters. The project that I am working on is a 2 Meter D-Star
repeater.
The core of the system is an ID-RP2C and the ID-RP2V. I will be running on
145.12 with a - 600 Khz split. The antenna is a
Re: The GLB Preselector- Preamplifier
I think we've covered this before, but I'll say it
again: the noise figure spec, the most important spec
on any preamp, is missing! Would you buy a power
amplifier that only spec'd 10 dB gain?
Yes, if it's composite performance includes very
At 11/26/2009 09:39, you wrote:
You might need to add a several DB attenuator
between
the pre amp and the receiver to keep from over
driving
the front end.
Not if you use a good receiver, or not use a preamp with
too much gain.
Bob NO6B
What defines too much gain
At 11/26/2009 10:08, you wrote:
So what is the recommendation to set the loss of the BP cavity? I have a
setting as to 3 db, 1 Db, .5 Db Etc. Running the ARR preamp on a UHF
repeater, it seems the preamp is a little too much and we get a little
desense. I am only running a 4 cavity duplexer
What defines too much gain can vary wildly.
Each install would be different. But too much gain
can be tested for... (measured) and with the proper
construction be fairly easily controlled.
0.1 uV is about as good as you can do with a NBFM RX,
as that's roughly 6 dB above kTB when T=295
At 11/27/2009 08:35, you wrote:
Re: The GLB Preselector- Preamplifier
I think we've covered this before, but I'll say it
again: the noise figure spec, the most important spec
on any preamp, is missing! Would you buy a power
amplifier that only spec'd 10 dB gain?
Yes, if it's composite
At 11/27/2009 11:14, you wrote:
I would have never considered a dual series RF Preamplifier
layout viable until I'd seen one demonstrated against the
single preamplifier version. The properly installed and
setup dual preamplifier layout with system gain well in excess
of 14dB clearly out preforms
Yes, if it's composite performance includes very
good/great 3r Order Intercept Performance.
...but the P1dB for the GLB isn't given, so we don't
have that either. How do we know (other than anecdotally)
what the 3rd order intercept performance of the GLB
within its passband is?
Two
On Nov 27, 2009, at 12:14 PM, skipp025 wrote:
There are Northern California site locations in operation
where the Repeater Rx Antenna System contains the desired
pre-selection, two series pre-amplifiers separated initially
by an adjustable attenuator and later a fixed value. It's
beyond
On Nov 27, 2009, at 9:00 AM, john_kc4yi wrote:
I have been following the post on receiver preamps. I would like to expand
the topic to D-Star repeaters. The project that I am working on is a 2 Meter
D-Star repeater.
The core of the system is an ID-RP2C and the ID-RP2V. I will be running
I would have never considered a dual series RF Preamplifier
layout viable until I'd seen one demonstrated against the
single preamplifier version. The properly installed and
setup dual preamplifier layout with system gain well in excess
of 14dB clearly out preforms the rest of the bunch
There was a time when the ol' Midland 13-509 mobiles made good radios from
which to build a 220Mhz amateur repeater. I have a 13-509 for sale in
excellent condition and in the original box. Included is the manual,
mounting bracket, and mic. Has several pairs of crystals already installed.
Asking
Hi Nate,
Two or three people have already Emailed me direct so here
goes...
Nate Duehr n...@... wrote:
Nate Duehr, WY0X
I'd love to see how that gets properly measured, if you
ever have the time, Skipp. That one's outside of my
knowledge level, for sure.
Can do:
The measurements
The Midland 13-509 is spoken for.
Thanks all,
Gary
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Gary
Sent: Friday, November 27, 2009 1:38 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Midland 13-509
At 11/27/2009 13:08, you wrote:
Yes, if it's composite performance includes very
good/great 3r Order Intercept Performance.
...but the P1dB for the GLB isn't given, so we don't
have that either. How do we know (other than anecdotally)
what the 3rd order intercept performance of the
FWIW the BF981 is a dual-gate MOSFET, not a GaAsFET. I assume Aria
switched to a GaAsFET for the current-production unit?
Bob NO6B
I bought several of these when they were first on the market.
When this unit was first in production from Gil, he made it available
like this:
Under 200
Great! Too bad the manufacturer didn't do this;
would've saved you others the trouble of having
to characterize a brand new component.
I actually ended up verifying what another person on
a similar path did before me.
I didn't miss that at all. You seem to be missing
my point
Re: The GLB Preselector- Preamplifier
Kevin Custer kug...@... wrote:
I bought several of these when they were first on
the market.
I think enough of the GLB designs that I'd like to buy
anyone's used working or dead unit if they're not trying
to retire on the sale price.
When this
skipp025 wrote:
Smart guy... cumbersome type of duplexer that worked
fairly well. I survived living near Tonawanda NY in
Cheektowaga where snow is no fun.
Yes, Gil was a very smart guy - somewhat ahead of his time.
Here is the only information I can find (that is still available) about
At 11/27/2009 15:27, you wrote:
Great! Too bad the manufacturer didn't do this;
would've saved you others the trouble of having
to characterize a brand new component.
I actually ended up verifying what another person on
a similar path did before me.
I didn't miss that at all. You
Thanks for the reply Nate. I have read the Utah reports. They give a good work
around for proofing the repeater system using analog test equipment. I
commend them for spending that much time in the lab doing equipment
evaluations.
I am still hoping to get a response from someone who has
For those readers who are unfamiliar with the GLB Preselector Preamp, I have
attached a network analyzer plot of the 220 unit I have.
73, Eric Lemmon WB6FLY
GLB Electronics P-222.900 Preamp.pdf
Description: Adobe PDF document
- Original Message -
From: Gary
The Midland 13-509 is spoken for.
===
I have two or three of these radios, not only in the original boxes, but
still in the factory plastic. They have never been unwrapped nor had 12V
applied to them. I originally
Tonawanda doesn't get near as much snow as a bit further south - Chautauqua
County. We had 295 here in Mayville last season.
Chuck
WB2EDV
- Original Message -
From: Kevin Custer
To: Repeater-Builder@yahoogroups.com
Sent: Friday, November 27, 2009 7:27 PM
Subject: Re:
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the Repeater-Builder
group.
File: /Polyphasor F.I.S.T.2 Tester/Polyphasor_FIST2_Tester.pdf
Uploaded by : k1ike k1ike_m...@snet.net
Description : Polyphasor FIST2
The key is the manufactures data sheet for the device
and the completed pre-amplifiers real world measured
3rd order performance.
This reply appears to be in the context of one designing
their own preamp. I was thinking in terms of commercially
available preamps.
So was I..
I was able to get a Polyphasor Field Impulse Suppressor Tester-2 on
loan. I scanned the manual and posted it to the group FILES area. I'll
send some photos in the next few days and see if I can get some time to
play around with it. This manual may answer some of the questions that
have been
Excellente'
Any chance you can park a copy of it in the group files
section for those of us who don't receive attachments
when we read the group via a web browser?
s.
Eric Lemmon wb6...@... wrote:
For those readers who are unfamiliar with the GLB
Preselector Preamp, I have attached a
Anyone have a schematic?
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the Repeater-Builder
group.
File: /GLB/GLB Electronics P-222.900 Preamp.pdf
Uploaded by : wb6fly wb6...@verizon.net
Description : Network Analyzer Plot of GLB
Is there any other way I can get this file as I seem to have forgotten my yahoo
id so have no access
Tnx
B
From: Repeater-Builder@yahoogroups.com
To: Repeater-Builder@yahoogroups.com
Date: Sat, 28 Nov 2009 02:45:58 +
Subject: [Repeater-Builder] New file uploaded to Repeater-Builder
At 11/27/2009 18:33, you wrote:
Anyone have a schematic?
Or noise figure measurements? Or P1dB measurements?
I'd expect the P1dB to be quite reasonable, perhaps a couple of dB better
than a typical GaAsFET due to the loss of what filtering it does have on
the input side of the preamp. I'm
It comes down to where are the IM products really being generated.
I think what Skipp is trying to say is that if the preamp generates spurious
products from overload that fall outside of the center frequency, that
filtering behind the preamp will help keep those products out of the
receiver.
At 11/27/2009 18:19, you wrote:
Yep, but the GLB trailing tuned circuits would also
improve the realized GaAs Fet device equipped 3rd
order performance... as would properly set cavities
between a pre-amplifiers output and the receivers
input.
No, they don't. They only improve the
I have recently received several partial Mastr II and Mastr IIe UHF remote
stations. I do not need, and cannot use, all of the cards and parts in the
units. If anyone needs a card or module, they are available for postage.
Please only request one if you truely need it.
Thank you
Bill
To the group I am new at building ,with the help of a friend we put together a
uhf mobil. at 45 watts out I had a problem with the pa . A small copper loop
beside the power adjust pot. burned thru the board and took out a cap.I was
able to get it back online but am worried about overheating
Hi Tim,
Another tip/trick,
After replacing the caps. You also should clean the board(s). After they leak
it will in some cases destroy the traces it is highly acidic and highly
conductive. Some times you can see discoloration on the board around the cap as
they leaked. Clean that off and your
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