not kidding).
Kevin Custer - W3KKC
Countries.
Kevin Custer
List Owner
On 8/30/2010 6:01 PM, Chuck Kelsey wrote:
I agree with Jeff 100%.
Me three...
Kevin
that the
VSWR on the line is acceptable when it may not be./
Sorry - I don't agree.
Kevin Custer
Jeff DePolo wrote:
Because the impedance is not matched between the transmitter
and duplexer, the 'apparent' loss of the duplexer is greater
than the manufacturers stated loss of the duplexer. Changing
the cable length is not changing the loss of the duplexer,
it's changing the power that is
Kevin Custer wrote:
Joe Ham buys a new duplexer and hooks it up to his 110 Watt MASTR II
repeater and gets 50 watts out the antenna port. He does his homework
and realizes that he should only be loosing 29%
Wow -* loosing -* that should have been losing - that's what I get for
being
Kevin Custer wrote:
I had one instance of a ham radio club loosing PA's left and right on
their 2M machine.
Indeed - I am loosing my mind - grin
K
into a sense of
security that the VSWR on the line is acceptable when it may not be.
What? Maybe you would like to have another chance at that one
Kevin Custer
Ross Johnson wrote:
So will someone post a simple rule of thumb... If you have the option
of optimizing cable length from PA to first cavity, IE you haven't
made them yet what's the best simple rule of thumb to follow to
build them to avoid reactance. 1/2wl if allowed minus coupling loop
Jeff DePolo wrote:
Maybe I'm not understanding right. Are you saying that by varying the cable
length between the transmitter and the duplexer that you can affect the
insertion loss of the duplexer?
No.
Because the impedance is not matched between the transmitter and
duplexer, the
Thomas Oliver wrote:
I am in need of a 2-5 watt range amp to drive an external amplifier,
the stock VHF MVP amp is adjustable from 8-25 watts output,
I think by bypassing Q202 I will be close to my goal. I need to know
where to connect the coax to keep Q201 from getting mad.
I have done
the solutions in #1 or #2.
I'm hopeful Jeff DePolo or Allan Crites will look this over and add
correct what ever I missed.
Kevin Custer
radi...@aol.com wrote:
Hi Kevin,
The desense is a staticy reception of weaker signals( ie an HT at 25
miles) It had gotten worse as it started to affect strong signals too.
If the transmitter was turned off, the repeater could hear just fine.
Problem is intermittent and often followed a
motarolla_doctor wrote:
Kevin,
I am using your coaxial matching section on a couple of antennas with good
results. Great article on RB and not too hard to build
MD,
I wish I could take the credit, but the original concept was from a
friend W8ZD - I just improved upon his concept. For
!!
In the MICOR, the first or second stages are usually the culprit, unless
something has taken out the final stages, which should only be replaced
as a whole, with matched units, if one or more are found to be bad.
Kevin Custer
radi...@aol.com wrote:
Hi Kevin,
I have confirmed that 2 of the 4 finals are bad. both are on one side
of the push pull. Both open base connection One has collector to
emitter short. The other open emitter.
I have not yet checked the drivers I might be able to test them
without removal. I
radi...@aol.com wrote:
Sucess!
I completely cleaned and re tinned my Weller 8100 tip, added some
solder, and got heat transfer to pop it up. I was not aware of the
fish paper that the wires came thru. Now to troubleshoot the amp. It
probably has some blown transistors as well as the cooked
Tom Parker wrote:
Why has no one suggested replacing the guts of this beast with a
Mitrek PA?
Why?
Kevin
on the frequency it's
designed to pass.
Kevin Custer
-vhf-tuning-instructions-remec.pdf
Watch for word wrap...
Kevin Custer
Bill wrote:
Apparently no one here got the moto memo on working with giant
heat-sinks. First you only need a 30-40 watt iron to work on them as moto
did at the factory The secret is.. raising the heat-sink to
about 3-400 degrees while you are working on what needs to be
radi...@aol.com wrote:
Thanks Kevin,
I think you are on to something. The areas that are pinned down seem
to be close to where the power supply wires enter the board from the
underside. I am wondering if the wires are glued down with RTV or
something. Cautious prying is still not getting me
radi...@aol.com wrote:
OK Kevin,
I had already tried the desoldering with a really good Pace unit, but
the heat did not transfer well. I will get a buddy to help and use my
Weller guns. I have a big 250 watt one here somewhere.
Marty
Let us know how you make out - or, if you need more
martinfriedman67 wrote:
Our Amateur radio club's Motorola MSR 2000 continuous duty amp needs repair.
I cant figure out how to remove the amp board from the heat sink. I removed
all screws from corners as well as the transistors. It seems to be held by
the center, just below the tall air
Joe wrote:
Hello Bob,
I agree that the GLB is a space saving device, but don't you think that
the multistage helical coil stages in the preselector with beat a single
cavity in skirts and out-of-band rejection?
Curves for the GLB are available here:
Kevin wrote:
The problem is, like any receiver that has several
helicals in cascade before the first active stage,
the loss that precedes the active stage has a majority
role in the overall NF of the system that follows. It
matters little what the quality of the active stage is,
n...@no6b.com wrote:
At 7/31/2010 09:31, you wrote:
Joe - the picture was inside the e-mail.
Bob - it is an SO-239 Tee, and it is into
a dummy load. (checked on 2 different ones).
Longshot, but try replacing the T, preferably with a silver-plated one. I
know I've had old
different thing ruining your lunch -
comparing apples to oranges.
Hope this helps...
Kevin Custer
Hi guys,
Took some time away from the project... loosing too many hairs.
Ok, I've gotten another receiver strip, and it has the specified
sensitivity per Mot.
Guess I want to bounce some ideas around
Tim wrote:
Hi Kevin,
Thanks for the info. I've used the PLL MastrII exciter on a couple of
systems also.
Now, since this duplexer is of the 'notch' variety, I already have about
100db of notch (on the TX side) that is tuned to the RX freq. Shouldn't
this be enough?
Yes, 100 dB of
Larry - I didn't.
The 250 watts is produced by a GE MASTR Pro/II 4EF5A1 capable of 330
watts continuous. The MICOR high-band tube amplifier, IMHO, is junk
compared to the GE 4CX250R based VHF power amplifier. The 4EF5A1 is
designed to operate from 144 to 174 MHz. without modification.
skipp025 wrote:
The less gain is related to the internal filtering stages,
not the device. I would expect the version with the GasFet
to have the typical expected NF for that device. Any other
available active devices to have Noise Figures commensurate
with their typical expected values
Tim wrote:
Using the Micor's exciter - about 270mW. Cannot see any spurs/noise
within 80dB of the main carrier.
I wonder Most of the MICOR exciters I have converted to 6M
result in more than 270 mW of power - in fact, 400 to 600 mW is
common. I wonder if something is amiss at the
Steve wrote:
Hi Kev
would it be feasable to use a sig gen cranked right up ?
Depends on how clean the signal generator is. I'd think it doesn't have
enough smoke (output capability) to really be beneficial
Many generators have a strong carrier (here we go again) adjacent from
the desired
Tim wrote:
Actually, the output is about +26dBm, so it's closer to 400mW.
Good - that's more like it.
I've also tried a VX-5 on low power, and got the same result.
Obviously, something is wrong with the operation of your duplexer or
interconnecting cabling. I really don't think it's
Tim wrote:
Hi Kevin,
Yes, the original used RG-58.. couldn't see using it. Figured
it would give me desense!
As far as the amount of notch, I was surprised that the total
was more than each one added,
Don't be - it's common for the apparent notch to be deeper than the
measured addition
that out)). By the way, the GE PLL
exciter has 22 dB less phase noise at 600 kHz from its primary carrier
than does its multiplier counterpart, you can bet it's way more than
that at 6 MHz.
End of thread - everyone please more forward.
Kevin Custer
is getting to each
UHF receiver grin.
Kevin Custer
opinion)
because of the lack of adequate shielding, but this made good use of
otherwise poor quality cable. YMMV.
Kevin Custer
Jeff DePolo wrote:
I took a quick look at them, and what stands out like a sore thumb is 1.6 db
insertion loss with a 150 watt power rating. That means they'll be
dissipating close to 50 watts in such a small package. Doesn't give me a
warm and fuzzy feeling...
skipp025 wrote:
For those of you who'd like to see a few different examples
of various Simulcast Systems explained.
http://www.simulcastsolutions.com/case-studies.htm
Another explanation is available here:
http://www.repeater-builder.com/k7pp/index.html
Kevin Custer
Jeff DePolo wrote:
To get the RF phase accuracy you're implying that is required would mean
that everything in the RF path would have to guarantee that phase
relationship. That means the same length RF interconnect cables inside the
cabinet, same RF feedline length (or full-wavelength
Jeff DePolo wrote:
Everyone is entitled to make an ass out of himself now and then, but you're
abusing the privilege...
Now that's funny...
BTW: I had set the dudes posting privileges to Moderated, but Scott
decided to toss him - - Scott wins.
Onward and Upward.
Kevin Custer
Scott Zimmerman wrote:
--- That reminds me of a story Kevin told about when he worked in a CB
shop.
A guy came in and said he mounted his radio and now it didn't work.
Kevin went out to investigate and found the guy drilled two holes right
straight through the radio and used two lag bolts
has been cut or removed on the exciter. If so,
replace it or install a PL encoder board.
Kevin
Hi Kevin and group,
I get PTT on pin 9 and 10. before i replace parts the manual says about Q8
and a CR5 as problems any thoughts ?
Ryan n3ssl
--- In Repeater-Builder@yahoogroups.com, Kevin
n3ssl wrote:
Hi Group,
I have a Vhf Micor unified station that was modfied prior to ownership. The
Mods for the Station control module were performed as on the RB site. The
problem I am having is there is no PTT on pin 5 of the back plane. Is there
something i should check ? The Station
DCFluX wrote:
Working on converting a Linear Modulation (Similar to ACSSB) 220
Trunking repeater to Amateur Radio applications, but I need your help.
I am experimenting with a LMC3005 repeater, also known as
the Viking LX. I believe the RF and Signal processing boards are similar
to the
DCFluX wrote:
Can you power one up and see what the display says?
Mine all show and have a solid squelch that blinks off about once
every 2 seconds. Maybe there is something critical in the RAM module
and the battery went dead.
As I understand it there is an elaborate power up thing
I got several personal emails about not being able to reach the Repeater
Builder site this morning. Google has reported the site has been hacked
and most browsers redirect you to a big warning page. I scanned the
supposed infected pages, http://repeater-builder.com and
La Rue Communications wrote:
Right on Kevin -
Thanks for staying on top of this. I checked all my browsers, I have
about 10 on both my Mac and PCs and got no errors.
Warning page redirects are only happening to people that have or use
(subscribe to) Google add-ons and similar software.
So, here is the conclusion to today's events following the supposed
repeater-builder.com site hack.
We have processed your request for review of your website,
http://repeater-builder.com/. At this time, none of our data partners
are reporting badware activity related to the site. Any warnings
Bob Meister has written a nice article on the Molotora Gontor for RB.
http://www.repeater-builder.com/molotora/gontor/gontor.html
Thanks go out to Bob for his efforts!
Kevin Custer
://www.amtronix.com/e8285a.htm
Rick can be reached at:
http://www.amtronix.com/
Kevin Custer
Nicholas Cerreto wrote:
Hello!
Does anyone have a service manual for the Doug Hall Voter 4RV Voter?
Not likely...A manual with schematic is not offered by Hall.
If you need it repaired, try shotgunning the IC's or send it back to
them for repair.
Kevin Custer
as others.
Kevin Custer
Kris Kirby wrote:
IIRC Motorola usually used about 1W at the exciter to drive the PA to full
power.
--
Kris Kirby, KE4AHR
Disinformation Analyst
Not on the MICOR line. All are 400 mW out of the exciter regardless of
band. Low Band exciters usually make 600 mW, but their spec is 400 mW.
tahrens301 wrote:
Hi all,
Working on a micor mobile to be used as a
repeater (only using the exciter/control board/PA).
Was going through it, and am only able to get
about 75 watts out of it with the exciter on 53.7.
The exciter is putting out 0.3 watts... a bit more
than most exciters
or
something. This is not their normal practice and I can only assume
your messages are not getting delivered.
I'll let you know when I get their reply.
Kevin Custer
List Owner
and savings accounts.
Kevin Custer
Tedd Doda wrote:
Kevin Custer wrote:
John paid with an eCheck, which is subject to delays just like a check
that clears the the bank. There are ways to transfer money to PayPal
instantly, like instant transfers from checking and savings accounts.
In all the years (since 1999
filter or
something. This is not their normal practice and I can only assume your
messages are not getting delivered.
I'll let you know when I get their reply.
Kevin Custer
List Owner
Kris Kirby wrote:
I see the guidelines for writing; what are the guidelines for scanning
documents?
PDF please. Make the file as small as possible, BUT, don't skimp
terribly just to save server space. There are many methods in which to
scan and save - trial and error will reveal what you
with a
rural run 50 watt Japanese mobile.
Kevin Custer
The question that pops into my mind concerns the proposed 200 watt power
amplifier. I have to wonder where the notion to run an alligator system
originated. I see four possible answers:
1. We have this 200 watt amplifier, so we are duty-bound
working on an antenna that will cover what you need so your
transmitter can be ten watts or less.
The antenna doesn't know if it's receiving or transmitting - so the
antenna has absolutely nothing to do with transmit or receive balance -
which is now the subject.
Kevin Custer
need all of his 200 watts.
Kevin Custer
for the incorporation of its protection in a 220 conversion - but
I have never saw it if it has been done.
Kevin Custer
You wrote:
Switchers -as a class- are more efficient and reliable than linear supplies.
As a Class...
More efficient - yes, More reliable - that's debatable.
In the two-way radio world, linear supplies are the rule, switchers are
the exception. In 25 or 30 years, we'll see if switchers are
Sorry, I cannot answer that question. My reference was more toward the
replacement of an existing linear supply or new installations such as
GMRS or Amateur Radio systems - repeater or otherwise. Whether or not
their rule applies to newer Motorola or other commercial radio
manufacturers -
the whole LM-317 or diodes in the ground leg
deal. It only serves to make the circuitry more involved , harder to
mount, and for NO advantage whatsoever.
Kevin Custer
skipp025 wrote:
Oh yeah..? Got an Allen B. Dumont, (Fred) Link key in that collection?
My father had a Link FM transmitter on VHF - used a pair of 2E26's in
the final. It was paired with a receiver, but I don't recall what it
was. The receiver would get so hot it would burn up the tube
Doug wrote:
Jared;
You need to warp 4khz not 400hz... If they were made up for 146.01 I would
assume that they can do that.
Jared wrote:
I just need the crystal to go up a hair more (400 Hz on the crystal freq).
In Jared's defense, he did say on the crystal frequency
He needs
AJ wrote:
Gents -
I completely spaced using existing CATV gear - I have a pallet of
Motorola/GI minibridger housings with just the power modules in the lid.
I'll see what I can do to test this out over the week and try to
report back - Pretty sure I can fit an entire remote receiver in to a
AJ wrote:
We've been given the opportunity to setup a remote receiver at the end
of local local cable television provider's plant on the hill to help
with coverage. Powering is the only issue we're running in to -
currently the only power available within 6 pole spans is the 90 V AC
plant
Eric Lemmon wrote:
AJ,
The obvious solution is to connect a commercial switching power supply-
definitely NOT a linear supply- across the AC source. Most Samlex, Astron,
and DuraComm switchers can work wonders in such an environment, where
conventional linear power supplies will surely
RE: 11M Repeater
This thread is now closed. Period.
Kevin Custer
List Owner
Off topic but curious—my Google Alert for myself picks up every entry
I make on Repeater builders—I belong to a number of sigs on yahoo and
yours is the only one that Google finds, wondering if there is a sig
setting to prevent Google from finding the posts or if it is something
you like
-builder.com/rbtip/222sensitronRX.html
This deeply discounted pricing won't last forever. Email me (directly
please) with any questions.
Thanks,
Kevin Custer
kuggie [at] kuggie [dot] com
will
be excellent so the voter can do it's job well. FM exciters on UHF in
the MASTR II are a little scarce. Use the following article to change
the common phase modulated UHF exciter to FM:
http://www.repeater-builder.com/ge/mastrII/ap-50-fm-mastr2.html
Kevin Custer
Since we have veered off course with this discussion, and it seams that
everyone that was interested gave an opinion, the THREAD IS NOW CLOSED.
Let's move on - back to subjects that are more on topic.
Thank you,
Kevin Custer
Kevin Custer wrote:
and it seams
Geesh It seems that I got lost in the seams.
more difficult.
Kevin Custer
Jeff DePolo wrote:
Does anyone have any two-way or microwave engineering contacts at Duke
Energy or Texas Eastern (pipeline)?
(If my memory isn't failing me As I remember)
N3LIF Roy Ed Kern worked for Texas Eastern as a radio/microwave
technician. He is likely retired now.
Ed's in
not $79.00 technology.
Kevin Custer
Mike.
Kevin Custer
is a service level agreement in which a company
guarantees connectivity - to some degree. The more reliability the
agreement extends - the higher the cost.
Kevin Custer
Jed Barton wrote:
tell me about this system a little bit.
You'll note that the manufacturer is not suggesting that you utilize
Michael Cox wrote:
Thank you for your help. I appreciate it! I've put a couple of
questions inline below.
Well - you'll need a duplexer no mater the price... grin
I was under the impression that if I had two antennas, I could get by
without a duplexer. Thanks for the heads up.
of the Week.
http://www.repeater-builder.com/acc/acc-rc-85-96y2k.html
Kevin Custer
Dan Blasberg wrote:
All right folks,
For those that run a 220 repeater, what are you running as far as the
machine itself?
MICOR VHF Mobile converted to 220 and duplexed to a repeater.
A local group is looking to put a 220 MHz repeater on the air and
would like some ideas.
Here's
prefer the MICOR, but there is absolutely nothing wrong with a MASTR
II on 220.
If you'd rather not do the conversion yourself, Scott Zimmerman will do
the conversion (GE or Motorola) for you:
http://www.repeater-builder.com/custombuilt/index.html
Kevin Custer
Kevin Custer wrote:
If you are into GE MASTR II radios instead of MICOR's, get yourself a
PLL VHF MASTR II mobile and use this conversion kit. It's by far the
simplest conversion to the 220 ham band.
Forgot the dumb link
http://www.repeater-builder.com/products/MIIconversionkit.html
recommend a NHRC model that plugs into the Systems
board, or, one of the Pion Simon models that plug into the card cage.
http://www.nhrc.net/ge-stuff.php
http://www.pionsimon.com/products.htm
Good luck,
Kevin Custer
circuitry can be gotten rid of.
The NHRC Micro is a really good controller choice where power
consumption is concerned. The Micro installed in a MICOR allows solid
RF technology to be interfaced with a modern controller.
http://www.nhrc.net
Good luck with the project,
Kevin Custer
Joe wrote:
We were just talking about the GLB preselectors recently. Now I have a
dead one.
I got a call that one of the local ham repeaters went stone deaf after a
lightning storm a couple of weeks ago. I got time today to stop by and
found that the GLB preselector bit the dust. I
tahrens301 wrote:
Hi Folks,
snip---
Since I'm looking at using it as a solar pwr'd repeater, what
is the best way to turn the power down (without making a bunch
of spurs along with it)?
Remove parts of the PA back to the desired output. Match that
in it -- go figure.
GLB stand for Gilbert L. Boelke W2EUP inventor of the Hybrid Ring
Duplexer - a design sold to Sinclair Radio Labs in Tonawonda NY
Kevin Custer
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
W8YSU wrote:
Does anyone on this list have pictures or scematic of a VHF Master II hooked
up to an ARCOM RC-210?
We are starting to work on one for our Club Repeater and I am looking for
some examples for reference.
Dean,
Station or converted mobile?
Did you look here?
www.mastr2.com
hetrodyning? (especially with PL tones
tone-out tones).
Here is a good tutorial written by a good friend of mine, Pete Policani K7PP
Hope this helps...
Kevin Custer
Properly simulcast transmitters coupled with voted receivers really
make a nice system; where the user is concerned
over - back to our regularly
scheduled programming.
Kevin Custer
List Owner
a nice vacation. Those
continuing with the OT posts will be promptly banned - period.
Thank you for your consideration,
Kevin Custer
List Owner
gain in an omni directional
pattern is doable.
Kevin Custer
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