At 08:39 PM 05/19/09, you wrote:
I have the -B version of the VHF manual already scanned, but it's 44
megs.
George, KA3HSW / WQGJ413
If your email system can send it without complaining
please send a copy to wa6...@repeater-builder.com, or you
can FTP it to ftp.repeater-builder.com - just
Skipp,
Do you have any idea WHY the models with two dipoles side-by-side
are problematic and the in-line models are not? Are there
differences in the construction of the individual dipoles that cause
problems? Differences in the phasing harness? I'm thinking about
using these dipoles to build
The db/Andrew/Comscope folded dipoles do not have this problem? Why not? What
is the difference?
73 de N5NPO
Norm Knapp
- Original Message -
From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
Sent:
I purchased a Uniden 28 volt power supply today on ebay. It lookes like the
Astron LSRM-25A or 35A both front and back (I assume Astron made it). With out
seeing it I assume it works OK (cost $2.00 + shipping). Has anyone converted
one of these to 12 volts? I have no schematics for it and can
Note the problematic Sinclair VHF dipole arrays are/were the
models with two Dipoles per mast position, which means each
location on the mast has a horizontal bar with a folded dipoles
at each end of the mast (two parallel dipoles per horizontal mast).
The traditional in-line folded dipole
I'll ftp it from home tonight ATT/Yahoo won't allow attachments over 5 MB.
George
From: Mike Morris WA6ILQ wa6...@gmail.com
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, May 20, 2009 1:08:24 AM
Subject: Re: [Repeater-Builder] MSR 2000 simplex base
Should be in the group archives a few years back.
Sinclair renamed/changed the names/model numbers for
pretty much the exact same vhf antennas I have had all
the hell with... but they are pretty much the same design
as the current models with reported changes in the coax
harness/feed system
Hi Andy,
You should have the duplex back plane unit (the card cage) as
easily defined having the R1-Audio Card horizontal above the
station control module. If the unit has CTCSS (PL) there will
be a PL Module horizontal above and on the left side.
It is possible to duplex a base station
Sorry about the misspell of MaxTrac, I know better.
The rack mounts we produce are standard EIA 19 wide and 3.5 high with
standard mounting slots for mounting. Supplied with 10-32 mounting hardware.
We also offer a single version of the Maxtrac size radio cutouts.
We are also do some custom
NORM KNAPP wrote:
The db/Andrew/Comscope folded dipoles do not have this problem? Why not? What
is the difference?
73 de N5NPO
Norm Knapp
- Original Message -
From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
To: Repeater-Builder@yahoogroups.com
--- On Wed, 5/20/09, Charles Lowery clow...@va.net wrote:
From: Charles Lowery clow...@va.net
Subject: [Repeater-Builder] Help with power supply
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, May 20, 2009, 1:27 PM
I purchased a Uniden 28 volt power
supply today on ebay. It lookes
Hello everyone,
I have an issue and I thought I would throw it out there!
I have a Dstar VHF repeater system.
A 4 Can Telewave Duplexer
A Chip Angle Band Pass Filter on receive
and a Chip Angle 18db pre-amp.
Everything works just fine running the repeater barefoot at 20 watts. My
problem is
On Wed, 20 May 2009, atms169 wrote:
A 4 Can Telewave Duplexer A Chip Angle Band Pass Filter on receive and
a Chip Angle 18db pre-amp.
Everything works just fine running the repeater barefoot at 20 watts.
My problem is when I add the TE Systems amp (Around 100 watts out when
hooked up),
Aaron,
My CommShop for Windows program suggests that about 88 dB of isolation is
needed for a 20 watt repeater, assuming 0.2 uV sensitivity on the receiver-
which you didn't specify. Bumping the power to 100 watts will increase that
figure to about 95 dB. My gut feeling is that your duplexer is
Yes, 80 dB on the duplexers, 100 watts in, that's 10 dB and the preamp 18 dB,
so I'm losing 8 dB ??
The sensitivity I believe is 0.4 uV Dstar system.
I live in Texas where it's flat. I'm adjusting my station to compensate for
the height value. More power good receive. There is a 1000 foot
O I C. I guess I have never seen dipole arrays in a horixontal array before. I
didn't know that would work.
- Original Message -
From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
Sent: Wed May 20
Aaron,
You left out the crucial information: What model Telewave duplexer?
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of atms169
Sent: Wednesday, May 20, 2009 5:29 PM
To:
He may need to find a set of sinclair Q202's to go with that. I have had a bit
of trouble with Telewave running a 100watts with only .6 mhz sep. They do fine
at 50watts or so. Tuning gets very tricky with the TPRD-1554 cans at that much
power and only .6 meg spread.
- Original Message
Very common for UHF. Not seen as often on VHF. Google some of the antenna
manufacturers or Tessco and look around.
Chuck
WB2EDV
- Original Message -
From: NORM KNAPP nkn...@twowayradio.net
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, May 20, 2009 8:50 PM
Subject: Re:
Sorry about that, the model number is TPRD-1454
Aaron
--- In Repeater-Builder@yahoogroups.com, Eric Lemmon wb6...@... wrote:
Aaron,
You left out the crucial information: What model Telewave duplexer?
73, Eric Lemmon WB6FLY
Anyone with a 500+ guyed tower?I am working on a power point presentation
for the local OEM. The subject matter is selecting an appropriate LZ for
medivac helicopters, IE keep the aircraft away from towers and power lines.
What I am looking for is a night day shot from exactly the same
On Thu, 21 May 2009, atms169 wrote:
Yes, 80 dB on the duplexers, 100 watts in, that's 10 dB and the preamp
18 dB, so I'm losing 8 dB ??
Assuming you're not experiencing front-end overload because of your
pre-amp.
The sensitivity I believe is 0.4 uV Dstar system.
I live in Texas where
This leads me to a question that I have had on my mind. How are people
doing desense testing with D-Star systems? (Remember, it's digital.)
73, Joe, K1ike
Eric Lemmon wrote:
Aaron,
My CommShop for Windows program suggests that about 88 dB of isolation is
needed for a 20 watt repeater,
Receiver gain does not work the same as transmitter power increase. A 10 db
increase in transmitter power is not the equivalent of adding a 10 db preamp
on the receiver. It would be if your receiver was very noisy
(internally)(very poor receiver) to start with and the 10 db preamp overcame
the
Yeah that is a good question. All we do is test from a portable a few miles
from the repeater. Low power settings on TX for the portable.
Test with the amp inline and the amp out of the equation. I find very quickly
there is something wrong.
That's all I can do, I can't vary the output
Aaron,
Howdy again neighbor! Don't start spreading rumors that its flat in Texas,
it's all downhill to the beach.on second thought it IS flat and the
water is bad
Are these the cavities I tuned for you last fall? If so guys these are
typical specs for 4 cans BPBR. Sorry but I
--- In Repeater-Builder@yahoogroups.com, NORM KNAPP nkn...@... wrote:
O I C. I guess I have never seen dipole arrays in a horixontal array before.
I didn't know that would work.
You've seen them. A DB420 (one example) has 8 positions vertically, each
position has a pair of dipoles next to
Hey Don, yeah good to hear ya!
Well, the system is at my house. If I could find a tower (Trust me I have
looked around) then that would make the world of difference.
Its up on my tower about 60 feet (Both UHF and VHF). The VHF has pretty good
coverage. The UHF not so much, probably half of
Put your fire suit on Aaron, you actually typed LMR. Do a search here and
you will find it is known to be a problem in duplex service.
With greater losses on UHF the ranges your observations are expected.
Don
-Original Message-
From: Repeater-Builder@yahoogroups.com
Aaron,
I think we've found the cause of your desense: The TPRD-1454 duplexer,
which has four 5 cans, is rated at 77 dB isolation, and is marginal with 20
watts TX and RX sensitivity of 0.4 uV- which calls for at least 82 dB
isolation. At 100 watts, 95 dB is recommended. While these recommended
On Wed, 20 May 2009, Eric Lemmon wrote:
I think we've found the cause of your desense: The TPRD-1454
duplexer, which has four 5 cans, is rated at 77 dB isolation, and is
marginal with 20 watts TX and RX sensitivity of 0.4 uV- which calls
for at least 82 dB isolation. At 100 watts, 95 dB
I was originally leaning in that direction, purchasing 2 more cans and a new
phasing harness. I was told to stop what I was doing and rethink by other hams.
I think you are right. I will order the new cans and make another trip to San
Antonio to see Don.
Don, if your reading.. I'm a headin up
I have opened both repeaters. The VHF already had the blue hardline in it, the
UHF however I replaced with superflex.
I may try something different. Hardline up the tower and for a patch cord
(about 10 feet) up the mast I'll use superflex. I'll have to play around and
see what I have still.
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