der%40yahoogroups.com>
[mailto:Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com>] On Behalf Of Tony KT9AC
Sent: Sunday, August 29, 2010 8:56 AM
To: Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com>
Subject: [Repeater-Builder] Wher
Sorry to ask a dumb question, but I have some Maxar 50 UHF radios
apart that I'm installing crystals from International, and they included
what looks like 1% (light green) resistors. I can't see in the Moto
manual where they would go since Moto would recommend using their parts.
Just need a "
Remember the objective is not to take the brunt of a lightning strike,
but to drain off any static that would attract that strike. Lightning is
just a spark looking to close the gap, and if your antenna is closer to
DC ground, it will find something closer to its potential (i.e. static
charged)
Try dropping PL on the tail. Could be a signal mixing with your repeater
offset and allowing your PL to keep your repeater receiver open. For
example: 442.000 transmit with 100Hz PL + 5Mhz signal = 447.000 with
100Hz PL.
Doesn't matter if you use PL or DPL - it still loops back in, and ham or
Sorry, and apologies for the extra email, just wanted the info to be
complete.
The "3" near the end is the range - 1=403-433, 2=not used, 3=438-470,
4=470-490, 5=490-512
Awesome radios.
On 06/22/2010 09:59 AM, Tony KT9AC wrote:
I think you mean M44GMC29C3AA's - tons f
I think you mean M44GMC29C3AA's - tons for sale on eBay typically around
$50 each.
M = mobile
4 = 25-40W (20% duty cycle)
4 = 438-470 Mhz
GMC = this series (actually German Maxtrac is where these came from)
2 = wideband deviation (5Khz, where a 0 would be 2.5Khz narrowband - not
switchable, one
All is not lost Josh - I'm running Motorola T1507 which are 4-can
pass-only cavities on my Micor. Actually pass-only are better for
commercial sites since they will help keep out a lot of intermod on
either side of how they are tuned.
Pass-notch on the other hand will pass the tuned frequency,
Jeff,
Good explanation, especially the fluttery/noisy user signal.
Would this general theory apply for factory Micor DPL boards as well?
I might run my repeater using DPL since that is what I have available
and its working fine.
Tony
On 05/03/2010 02:36 PM, Jeff DePolo wrote:
I don't ha
Would this still allow the reverse-burst to pass through, or just
abruptly cut off?
On 05/03/2010 12:14 PM, wd8chl wrote:
On 5/3/2010 1:08 PM, Jeff DePolo wrote:
>
>
>> I'm guessing I am not the first to want to do this...
>>
>> I want to use a UHF Micor for a link. I want to be able to stop t
Good question Paul. Remember the Mitrek RF decks are almost the same
used in the MSR2000 repeater, and with their tuned helical front end
make great receivers.
For the transmitter however, I would not run it on its own. Also
reducing the power output below 50-66% of rating might cause spurious
I'll take the Micor elements. PM sent to Terry (hope it didn't get
caught in a spam filter...)
On 04/17/2010 02:58 PM, terry_wx3m wrote:
I recently took 2 UHF machines off the air.
I have for a Mastr II 1 5C on 442.050 and 1 EC on 447.050. These were
custon built by Bomar crystal at a cost
Ken,
If your T1500 cavity is the "loop" type such that the SO239's are closer
to the tuning screw, you can set the pass to 434.xxx and the reject to
442.675, but might have to move the stationary knob to the outer
position to get greater than a 5Mhz split. Rejecting that way is only
effective f
Brian,
I agree with Steve, but as a side note if you can run the mobiles at
their lowest rated *power* and use an external PA and fans, it should be
ok. Rated power for example means a 10-25W model run at 10W (since below
that it might induce problems). I have two Motorola GM300 1-10W radios
(M
Thanks for the explanation Nate. Reminds me of Smartnet II simulcast
systems locally (one TG brings up all five sites for example).
Tony
Nate Duehr wrote:
>
> Each repeater handles two 6.25 KHz "channels" simultaneously, if
> that's what you mean...? But both "channels" are continuously receive
Time to start taking the lead and develop something!!
http://developer.motorola.com/products/twowayradios/
Nate Duehr wrote:
>
> I talked to an owner of a system last night and he confirmed that user
> ID's are 8 digit, as are talk groups. There are some numbers that are
> reserved for all-ca
If it was just audio then there would be no feedback of the PL/DPL
tones, keeping the repeater locked up.
Good advice though.
Jeff DePolo wrote:
>
> >
> > On 2/23/2010 3:11 PM, Jim WB5OXQ inb Waco, TX wrote:
> > > Is it possible the AM signal is getting into an audio stage
> > instead of the
> >
and you can't really tell if the problem is in
> the antenna, antenna feeder, or something external.
>
> 73,
> Mark VK3BYY
>
> -Original Message-
> From: Repeater-Builder@ yahoogroups. com
> <mailto:Repeater-Builder%40yahoogroups.com> [mailto:Repeater-Build
If you wouldn't mind...that would be interesting to see how it works.
DCFluX wrote:
>
> How about 1.25 MHz RF coming down the outer jacket of the UHF antenna
> and into the ground of the system? You have about 200 ft or so of
> coax? Try a mag mount antenna temporarily.
>
> Not really sure how yo
passs & isolater on
> the STL system.
> Make certain which station the broadcast audio is coming from and give
> the station engineer a friendly call, may reveal some info to help
> your issue.
>
> Chris
> GMRS Inc.
>
>
> --- In Repeater-Builder@ yahoogroup
Thanks Jeff. The AM station has the same power both day and night, just
goes from 2 towers to 4 to change the pattern.
Rusty bolt or fence line etc seems the most likely. The problem does
seem to disappear when its raining out, which helps verify this theory.
It might be a needle in a haystack
Hi everyone,
A while ago I was troubleshooting a bad feedback or "growl" problem
that was impacting a UHF repeater, of which the short term workaround
was to not encode TX PL (PL or DPL would keep it locked until the signal
dropped enough or timed out).
In doing some more research, I found a
Check and see if the DPL is either being presented or programmed as
"inverted". My TP-38 panel is opposite of what I tell it to do, even
though PL's always work.
On 1/29/2010 3:56 PM, plaimann wrote:
i have a zetron 48b controller , running 2 motorola vhf sm50 mobiles
via the acdcessory conn
).
>
> So as a last resort I have it available with a bit of time
> and work on my end.
>
> s.
>
> > Tony KT9AC wrote:
> >
> > Hi Everyone,
> > Picked up a nice Comm-Spec TP-38 and it appears to have the DCTCSS
> > (DPL) board and updated firmware. I don
Hi Everyone,
Picked up a nice Comm-Spec TP-38 and it appears to have the DCTCSS
(DPL) board and updated firmware. I don't have any documentation on it,
nor can I find anything on the Repeater Builder site. I might contact
Comm-Spec for a better manual if available since the scanned versions
cu
/repeater.html
> <http://www.josephoregonweather.com/repeater.html>
>
> --- In Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com>, Tony KT9AC wrote:
> >
> > Scott,
> > You are not alone in this!! I too have been fighting a problem
someone kerchunked it, then it started.
Tony, KT9AC
offtracks1 wrote:
>
> Thanks for all the post and for the web site and group.
> It's been very helpful to me as I have been setting up my system.
>
> My repeater system is a Kenwood TKR-750 K2, Telwave TPRD-1556 duplexer
&
.@yahoogroups .com] On Behalf Of Tony KT9AC
> Sent: Monday, November 23, 2009 1:36 PM
> To: Repeater-Builder@ yahoogroups. com
> Subject: [Repeater-Builder] Has anyone measured out-of-band rejection for
> a duplexer?
>
> Hi Everyone,
> Without the benefit of a spect
Hi Everyone,
Without the benefit of a spectrum analyzer, I would like to find out
how much rejection of out-of-band signals can be expected from a typical
UHF duplexer. Have a MSF5000 on 452 that works fine with the T4084
duplexers (1500 style), but have a lot of VHF data and FM broadcast hash
Motorola T1504. Just tuned one last weekend and average 81dbm reject
with probably 0.1uV pass loss. Good for 250W and 406-512. Lots of good
documentation on the Repeater-Builder page:
http://www.repeater-builder.com/motorola/t1500.html
Good Luck. Bought my last set for around $140.
Tony
bbfmr
Accessory plug, there is an option to disable TX PL with a jumper or RSS
option.
f...@fitzharris.com wrote:
>
>
> Hi All,
>
> I have a Maxtrac with no Tx PL. I've checked the programming several
> times, even cloned another radio. I've tried both TPL and DPL. I've
> checked the Tx output on the
I have a GM300 narrowband mobile (M34GMC00D3A), how do I know when its
programmed to do 12.5Khz? There is nothing in RSS to select, where the
MTS2000 CPS allows unique modes for narrowband.
Thanks,
Tony
Cort Buffington wrote:
>
> I said I'd report back
>
> XYL and I were out with the EX50
Hey everyone,
Working on a MSF5000 repeater with a 457 receiver getting overload from
a nearby 152 data transmitter (almost exact 3rd harmonic). The two
towers are about 10 miles apart and of course line-of-sight.
I seem to recall that UHF duplexers only have a useful range of 300-600
Mhz so
Hey everyone,
Thought about this yesterday...would it be possible to use a
conventional pass/reject duplexer to combine two UHF transmitters into a
single antenna?
Example:
Transmitter A is 453Mhz
Transmitter B is 443Mhz
Low-side pass 443, reject 453 (10Mhz spread); high-pass 453, reject 4
What about a local Trunked Simulcast system for a rough reference? They
should be GPS aligned somehow.
Al Wolfe wrote:
>
>
> Pity that the guy selling all this stuff is in China. I think I'll pass.
>
> Al, k9si
>
> > Re: ATSC pilot frequencies for sig. gen. alignment
> > Posted by: "wb6ymh" f
Sorry, listed the wrong assembly. If anyone has one for sale or trade
please let me know.
Tony
Tony KT9AC wrote:
Good Morning,
I am looking to upgrade my MSF5000 from a 40W to 110W UHF Range 2
(450-470).
Would anyone have one available for sale or know where I can find one?
Probably
Good Morning,
I am looking to upgrade my MSF5000 from a 40W to 110W UHF Range 2
(450-470).
Would anyone have one available for sale or know where I can find one?
Probably a TTE1754A from what I've been reading.
Thanks,
Tony, KT9AC
Does anyone know if a MSF5000 converted to narrowband operation would be
legal under Part 90 after 2013?
Tony
Gary wrote:
Don't know where you got the "below 512Mhz" comment from (except perhaps a
sloppy comment in a recent article printed in Urgent Communications) but
here's what the R& O
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 th
t
> > may be
> > > possible to join the connector to the cable would be to have a sleeve
> > > extend
> > > over the superflex and the outside of the UHF connector and then
> > solder
> > > the
> > > sleeve. This might not be as good of an idea as getting proper
Hello Everyone,
I need to make some short jumpers UHF-male to UHF-male and have a
length of 1/2 Andrew Superflex on order (actually eBay). Can I use
regular silver-teflon PL259's with this cable, similar to how 1/4"
superflex is used with the reducer? I can't find UHF Male connectors for
1/2"
Francois,
I have a 100W MSR2000 UHF and all the adjustments are in the PA itself
(intermittent unit). 400mW out of the exciter drives it, with no feedback.
My suggestion would be to look at the schematic and rig up your own
feedback circuit with a variable resistor. I'm not familiar with the 30
Other than ordering the software, is there an "old-school" formula that
can be used for this? I been using the "decibel-wheel" to convert from
microvolts to dbm.
NORM KNAPP wrote:
>
>
> H
> How about a mastr ii pll Vhf 147.225/147.825 with db224a @ 270' with
> 300' ldf7-50a and 110watts.
Hi Everyone,
I was helping a friend tune a Motorola T1502 duplexer yesterday, and
got the following readings using a service monitor and GM300 receiver. I
just want to confirm that what I did looks reasonable as I did tweak one
of the band-reject loops since observing a low reading. The repeate
Hi Everyone,
I'm thinking about buying a used service monitor for various projects,
and I've come across a few units that look good (from a price point) but
I can't find any data on them.
1) Racal Dana 6113G Digital Radio Test Set Service Monitor
2) Cushman CE-4000
3) HP 8924C
4) Ramsey COM3
Funny, I was just looking at this on Friday! Makes my 1/4 trunk-mount
seem less effective!
http://www.larsen-antennas.com/docfiles/ASB9/Mobile/MobileSeriesDesignations.pdf
Daron Wilson wrote:
There was an awesome pictorial in the back of some two way manual, I'm
thinking back to the Micor
Since you're going above frequency specs, is the Quantar anything like a
MSF5000 where you need to adjust a VCO to cover the new range?
Greg wrote:
Hi everyone,
I have a Motorola Quantar on the bench at the moment and I am having a
slight issue with the programming of the unit. I have prog
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