Did you use and Filters that helped isolate the tow transmitters?
de KM3W and WPWN390
--- On Mon, 8/31/09, skipp025 skipp...@yahoo.com wrote:
From: skipp025 skipp...@yahoo.com
Subject: [Repeater-Builder] adjacent repeaters linked
To: Repeater-Builder@yahoogroups.com
Date: Monday, August 31,
An opportunity arose for me to get in a site that would serve me well. Time was
of the essence (before they changed their mind) Financially, it just happened
to be a time where I didn't have the funds for 7/8 Andrews. I was able to get a
LMR-400 Chinese equivalent for dirt cheap. This got the
One other thing to check for if you take it apart. If Tram is like Diamond, it
uses capacitors for RF coupling/matching along the length of the antenna. These
are power limited. Two transmitters TXing at the same time can make them go and
they also can pop easily if there is a surge like a
Thanks, John. I'll give him a call this evening.
Doug N3DAB
--- In Repeater-Builder@yahoogroups.com, jo...@... wrote:
Sorry,
That was supposed to be a private reply.
He is Robin Midgett, K4IDC - 615-301-1642 Call him tomorrow evening, he
goes to bed early.
John
Some
Thanks for the infor, but I'm sorry to say that info is available from the
model number as well.
On this (and many radios), this is only the _band_ of operation, not the
_split_, which will be a subset.
For low band Maxtrac's, the splits are 29.7-36, 36-42 and 42-50 MHz. The radio
in one
You might have no problems for a while. Maybe even if you are lucky, for
quite a long time. At least you are aware of what will probably happen and
why. Good luck and keep us posted.
I've seen problems with it, first hand, time and time again. And once in a
great while, it behaves.
Chuck
Thanks anyway, Rich, I always appreciate helping energy.
--- On Mon, 8/31/09, Rich Osman li...@ozindfw.net wrote:
From: Rich Osman li...@ozindfw.net
Subject: Re: [Repeater-Builder] Fw: Sources of Maxtrac's
To: Repeater-Builder@yahoogroups.com
Date: Monday, August 31, 2009, 9:40 PM
Skipp, I have two VHF repeaters linked in-band. 146.92 with a remote base
radio on the other repeater frequency at 145.45. I use GE Mastr II radios in
both repeaters, and used a modified GE Mastr II mobile radio for the link. I
removed the final amp from the link radio and use the 250 mW
I drill a hole perpendicular to the axis of the cable through the RG59
reducer (in the smooth area above the threads) so you can get solder to
flow into it, maybe that's what Chuck was referring to?
For 3/8 Superflex, the OD of the cable shield is just a tad too big to
screw into a PL-259
I solder the reducer onto the heliax shield, then screw it in to the PL259
and finish the soldering - some through the PL259 holes that I have already
enlarged, and the center pin last.
Chuck
- Original Message -
From: Jeff DePolo j...@broadsci.com
To:
Is it ok to use Silver PL259's and nickel reducers (UG176)?
Thanks to everyone on their input. Trying to connect a MSR2000 and T4084
duplexer set (both UHF connectors).
Tony
Chuck Kelsey wrote:
I solder the reducer onto the heliax shield, then screw it in to the
PL259
and finish the
I should have elaborated when I recommended the 3/8.
I use a heat gun to make the jacket a little more pliable.
Works great.
Chris
Kb0wlf
-snip-
For 3/8 Superflex, the OD of the cable shield is just a tad too big to
screw into a PL-259 easily, so I take a drill bit and shave off the
tips of
It's a lot easier to get solder to flow on silver-plated connectors and
reducers...you don't have to use as much heat so it causes less
damage/deformation to the dielectric and jacket.
-Original Message-
From: Repeater-Builder@yahoogroups.com
Very nice Jim, Small problems are starting to rear their
ugly head because the link radio puts out more power than
I need and I have a red-hot receiver distribution system.
I'm sure the whole package would dance and sing out of control
if I didn't have so many protection schemes in place. I
I'm not sure exactly what the question should be... but
the answer is... that I'll have to add even more filtering.
The repeater lives on an Antenna Combiner System (yes, we
have one for the 222 MHz range) and the link radio on a yagi
some distance away (vertical over 100' separation). The
I probably would if I had nothing else.
Chuck
WB2EDV
- Original Message -
From: Tony KT9AC kt...@ameritech.net
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, September 01, 2009 12:33 PM
Subject: Re: [Repeater-Builder] Re: UHF Connectors for 1/2 Andrew Superflex
Is it ok to
I agree, but I've also found that solder will flow better if you take a
small file and shine everything up before soldering.
Chuck
WB2EDV
- Original Message -
From: Jeff DePolo j...@broadsci.com
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, September 01, 2009 12:48 PM
Subject:
Hi folks,
Just a bit of an update... got the 6 cavity Telewave
duplexer tweaked up - looks like it pretty much hit
the specs in the data sheet.
With a dummy load at the 'antenna' port, I used an
iso-tee to inject a signal at both the receiver
input, and between the antenna port the dummy
load.
Tim, did you happen to try the dummy at the end of the feed line instead of
antenna? Are you sure the connector from the 7/8 to the duplexer (or any
connector / adapter near that connection) is good? Did you put all the
covers back on during the antenna test?
You're getting closer!
Don W5DK
You state DB-224 100' horizontally 10' vertically separated. I
don't understand what you mean by that.
Joe
tahrens301 wrote:
However, putting the system on the antenna (a 150-160 mhz
DB-224 100' horizontally 10' vertically separated)
through a metal building fed with 7/8 heliax, there
Hi Joe,
The repeater/duplexer is in my workshop (a large metal building).
The heliax goes out the window to a smaller portable building
about 100' away (horizontally spaced). The antenna is on
that building about 10' off the ground.
Don - took the dummyload analyzer to the end of the hard
Seems to me the three most-likely causes of your problem are:
1. Antenna itself is bad/noisy. Substituting antennas may help rule this
out.
2. Not enough isolation between radiating antenna and equipment. The 100'
of horizontal separation may not be enough to keep the strong RF out of your
While you are out at the antenna, stick the wattmeter in line and check the
foward/reflected there with the antenna and the dummy load. My guess is
that you will quickly find your problem.
I would check the connection to the DB-224 coax as well as the connections
to each element. Also check
I swear to God, #4 will make you go completely insane.
Best fixes...
1. Lower output power. The distance-squared rule is your friend
if you're mixing somewhere EXTERNAL to your system.
2. Move off the site.
LOL!
I loved Jeff's very politically correct... You're on your own.
on that one.
Hi Jeff,
I'll try a different antenna... perhaps that's it.
Horizontal isolation possibly not enough, but 'only'
running 30 watts out, the repeater is a quantar,
all leads are RG214, so didn't figure that would be
it... I've seen a lot of installations with antennas
pretty close to the system.
Numbers 1 or 4 are the more likely.
He has a Quantar which is designed to live in high RF environments at antenna
sites making #2 unlikely. Also, with respect to #3, the Quantar PA has a
built in circulator as standard equipment.
Does anyone know or use a program where I can scan large schematics a little
at a time and then connect them back in a file like a pdf file? I cant
afford a large bed scanner but I have several 11x17s I would like to scan on
my 8 ½ x 11 scanner.
Randy
--- On Tue, 9/1/09, tahrens301 tahr...@swtexas.net wrote:
From: tahrens301 tahr...@swtexas.net
Subject: [Repeater-Builder] Re: Antenna SWR = Desense?
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, September 1, 2009, 5:29 PM
Hi Jeff,
I'll try a different antenna... perhaps that's
Hi guys Just updating on the 6mc450s style notch duplexer problem.We found
one of the 6 tuning insulators inside were burnt through the insulator so we
got the local engineering group to lave another insulator out of nylon rod
and have put it back together and tested it on the service monitor and
Northern California Ham Swap this Weekend Sat the 5th
If you're within decent driving range... the annual
W6OMF Western States, Weak Signal Society - Northern
California Ham Swap this Weekend - Sat the 5th at his
(Larry's) rancho in Vacaville, California... is the
coolest event to attend.
Numbers 1 or 4 are the more likely.
He has a Quantar which is designed to live in high RF
environments at antenna sites making #2 unlikely. Also, with
respect to #3, the Quantar PA has a built in circulator as
standard equipment.
OK. I missed (or maybe wasn't paying attention) that
Hi Tim,
My first suspect would be the cable from the duplex er feeding the 7/8. I have
problems there more than anything. Although the 2.1 swr is a bit high I would
shoot the easy target first.
BR
_richard
From: tahrens301 tahr...@swtexas.net
To:
Tim,
This might be it. I miss read the previous. Try the Ringo for grins and see
what transpires. Might be a bad connection on the old antenna.
BR
-Richard
From: tahrens301 tahr...@swtexas.net
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, September 1,
Is the antenna cut for the repeater freq?
In any case I've never known a bad match into a duplexer tuned into a good
match to work.
I've often fudged...Look at forward power while injecting a signal that is
noisy (when transmitter is keyed). Gently rock the cavity frequency just a bit.
If
Randy,
Rather than scan large schematics piecemeal, simply take the sheets to a
commercial graphics shop (some Kinko's may have the 11 by 17 equipment) and
have them scan the document in one piece. My local graphics shop can handle
huge schematics, so I take all Motorola and GE fold-out sheets
Thanks Eric! I will probably do that with my very large pages as you say.
In another group someone mentioned that Adobe Photoshop will stitch together
pdfs so I may try that with some of the 11 x 17s. I wasnt aware Photoshop
would do graphics like that.
Thanks again for your reply.
Randy B.
Randy,
Although stitching sounds really simple, it is hardly so. Many scanners
are not completely linear, because the area near each end of the scan is
distorted a little. When you attempt to cut and paste two segments of a
larger original together, you find that you can never get all of the
This is where that commercial graphics shop might come in handy...
they probably have the $500-$1000 software that can de-warp the
edges AND do the stitching all in a single mouse-click.
But the stuff isn't cheap.
Nate WY0X
I suggest you google Gimp
should be possible with it
To: Repeater-Builder@yahoogroups.com
From: wb6...@verizon.net
Date: Tue, 1 Sep 2009 19:21:42 -0700
Subject: RE: [Repeater-Builder] stitching schematics together
Randy,
Although stitching sounds
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