Gm 300 does have an internal deviation setting (max
dev )on the rf board side of the radio.
R302 -VCO mod being max dev and R164 pot being Ref
(ctcss)
There is also the squelch pot R60.
I do have some mods for bi-level squelch on these
radios that work just as well (better ) than the Micor
Is there an official procedure for adjusting both R302
and R164? I thought those were set at the factory and
the RSS deviation was supposed to be used in the
field.
Bob M.
==
--- bradley glen [EMAIL PROTECTED] wrote:
Gm 300 does have an internal deviation setting (max
dev )on the rf board
Good Day Bob
Yes these are factory set for the diffrent bandwidths
10/12,5/20/25khz although there is no technical
reason why one can change them in the field to
optimise your system.
What I do is check the RSS settings and make sure they
are roughly in the centre of their software and then
You might want to start here:
http://www.repeater-builder.com/mitrek/mitrek-index.html
Neil - WA6KLA
Scott wrote:
Would anyone have the tune up procedure for a VHF T43JJA Mitrek,
or maybe want to part with a manual. Putting together an APRS
radio, and need it.
Scott NA4IT
At 12/17/2005 08:05, you wrote:
With regard to interfacing radios via packet data ports.
Has anyone looked at the audio flatness of these ports?
Also, some rigs have a 1200 baud in/out and a 9600 baud
in/out, which (apparently) have very different audio levels.
I suspect there are other
At 12/17/2005 10:15, you wrote:
I've got the same setup. I also have a 4-section
Celwave bandpass filter between the duplexer and
preamp. I found that the 17dB gain was way too much
for the receiver, and the noise level increased
dramatically, to the point that I had to tighten the
squelch
At 12/17/2005 11:07, you wrote:
Bob M. wrote:
I found that the 17dB gain was way too much for the receiver, and the
noise level increased dramatically, to the point that I had to tighten
the squelch settings.
Think about this for a minute, if the noise level increased, the squelch
circuit
At 12/17/2005 10:21, you wrote:
At 10:15 AM 12/17/2005 -0800, you wrote:
I found that the 17dB gain was way too much for the receiver
---That's one reason I swear by Chip's stuff for over 15 year.
He places stability and noise figure over gain. The result are preamps with
extremely low
That all depends on witch pre-amp you buy what spec you need for your site
noise. I also swear buy his product.
Oregon Repeater Linking Group
Mike Mullarkey
6539 E Street
Springfield, OR 97478
www.orlg.org
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL
Scott,
The Mitrek VHF Service Manual 6881045E70 is still available from Motorola
Parts (800-422-4210) for about $30.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Scott
Sent: Saturday, December 17, 2005 6:28 PM
Speaking of UHF preamps, does anyone have any experience/recommendations
for tower mounted preamps? I have a receiving only site at 425 feet AGL,
DB420 antenna, 7/8 line, that feeds five receivers at present. Tried an ARR
on the ground before the splitter but it seemed to overload from UHF
I would like to install one antenna for four link receivers.How
complicated is this? What do I need to do this?
Thanks in advance
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Vincent,
It's easy! What you need is known as a multicoupler. This
unit usually comprises a preselector to limit the bandwidth of the incoming
signals, a low-noise amplifier, and a splitter with two, four, or eight output
ports. The gain of the amplifier is tailored to the number of
Think about this for a minute, if the noise level increased, the squelch
circuit would have seen MORE noise and rammed the squelch closed.
What actually happened is, adding a better device in front of the
receiver lowered the receivers total noise figure, decreasing the noise
in the
How about a lead to such vendors and some model numbers as well, would be helpful. Mathew Eric Lemmon [EMAIL PROTECTED] wrote: Vincent,It's easy! What you need is known as a multicoupler. This unit usually comprises a preselector to limit the bandwidth of the incoming signals, a
Good Day
If you are able to lose = - 6 db of the signal to
each receiver you could use a passive device which you
can build yourself and save many many dollars.
There is pleny of information on the web on a 4-port
Wilkonson divider .
The same phasing harness is used for a 4-stack dipole
Al,
I agree, you have a major-league headache! However, I believe that a
tower-top preamp is not the solution. The 7/8 inch feedline is rather small
for the frequency band and the length, with more than 3.5 dB of loss, but
it'll have to do. My suggestion is to put two 8 bandpass filter
Stephen Rice wrote:
Well Kevin I sent some questions to the ICS group but pretty much got all
the answers by playing with a touch tone pad and some wires so I could
program using the Cntrl input. Messages aren't approved yet so don't show up
on the group ! What I found is there are 2 errors on
Hello,
I'm searching for a working Tait T835-20 or -25
series I receiver module or a source to get one.
A source or seller in europe would be fine ;-)
73
Bernd
DM5BM
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Unless your test banch is inside a Fariday Cage you can'y rule out
extraneous signals. If there is a strong transmitter near by it's
still questionable. But you're right about off frequency or
off channel signals causing quieting in the receiver. This is
another reason for pre filtering the
Al,
Having to cover that band you should Notch out the paging
transmitters. All preamps that I know of are broad band devices and
that is likely why you got over loading. I would suggest a Notch
cavity for each paging frequency in series with between your antenna
line and the preamp/splitter.
Speaking of UHF preamps, does anyone have any
experience/recommendations
for tower mounted preamps?
Al,
My experiences with tower-mounted preamps have been less than perfect. Good
designs will have dual amplifiers (redundant) and/or a bypass relay. Aside
from amplifier damage due
Well we just installed a 1412RRN on our system this weekend and it
seems like a nice unit. Yes there isn't much info out there on the
web about TE Systems.
So I did want to post a link to the opperating and service manual that
I scanned in.. For HIGH-POWER 144-148MHz AMPLIFIER: MODEL 1412, MODEL
On a somewhat related note, has anyone used LNA Technology's (Chet Pierson
K3TV) preamps? He has some interesting designs. www.lnatechnology.com
--- Jeff
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Thanks for all the great info!
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Along these lines, someone on the list mentioned using coax multi-dropped
(coax tee) off to each receiver for a voter application. Can't find the
original posting. I was curious about the lengths required between the
antenna and then to each radio?
tnx,
Ralph W4XE
If you
Say I did see a AKAI TV set there seems like they are venturing the
consumer mkt. also Sams Club carries AKAI also.
I already have a RCA TV
Neil McKie wrote:
May work ok ... if you bother going to radio shaft at all ...
Neil - WA6KLA
Mike Morris wrote:
Date:
How many feet of 7/8 line? How high is the antenna? We try to avoid
tower mounted preamps at work due to the trouble servicing them. It
requires a tower climber to get to it, and then you hope that he knows how
to service it. 7/8 cable should have less than 1dB of loss per 100 feet
at
At 12/18/2005 17:12, you wrote:
On a somewhat related note, has anyone used LNA Technology's (Chet Pierson
K3TV) preamps? He has some interesting designs. www.lnatechnology.com
--- Jeff
I haven't, but notice the specs on the cavity input 432 MHz preamp: 3 dB
got a UHF amp from them about 2 years ago. was to be 150 watts output with
5 watts in.
gave them all the info ever the freg we wanted it tuned to.
when it came in is put out 134 to 137 watts with the 5 watts in.
called a number of time but no call back.
not sure if they still make product.
That sounds like an interesting solution, I would be interested in
learning more about it.
Ralph Hogan wrote:
Along these lines, someone on the list mentioned using coax multi-dropped
(coax tee) off to each receiver for a voter application. Can't find the
original posting. I was curious
Hi Al,
Both Telewave and Sinclair make tower mounted preamps,
but you'd better do much planning and engineering to
get the design/order right the first time.
As we saw with Alex in the South American VHF trunking
System. Many out of the box offerings can cause more
problems vs how much
If you use any of the below listed devices, you'd
better chuck the pre-selector (rx-filter) and
put something better in front of the preamp.
Been there, done that, coffee mug and tee-shirt.
cheers,
skipp
Eric Lemmon [EMAIL PROTECTED] wrote:
Good idea! Here are two:
Sinclair:
Jeff DePolo WN3A [EMAIL PROTECTED] wrote:
My experiences with tower-mounted preamps have
been less than perfect.
I've not see a perfect out of the box tower mounted
rx preamp assembly... yet. Some are good and well
designed, but none have been perfect.
...a number of tower-top preamps
Joe [EMAIL PROTECTED] wrote:
7/8 cable should have less than 1dB of loss
per 100 feet at 450Mhz. If it is a short run
of cable, you would be better off putting
the preamp where you can get at it,
For 98% plus people... Joe is right on the
money. Especially when a really good antenna
I've posted this a few times...
**IF** loss on the incoming signal(s) isn't an issue ...
1/2-wave (or multiple thereof) jumpers, daisy-chained
between Ts.
[rx.ant-coax] -- [T-(rx)] -jumper- [T-(rx)] -jumper- [last
rx]
Our RXs did not exhibit problematic interactions -- used
RG58 PL259s.
Our
From a Radioshack dealer stand point fo view, right now, you should ba able to get a 10% discount on a great majority of items from Radioshack, and yes Neil, they are giving the shaft, and many reasons why, the got the gadget guys in there, and they are always a day late, and 1/3 over priced.
The below is an old Decibel Products method
and it does works (and was used) on their
Tx Combiners. I have one here... along with
some very limited paperwork on it.
cheers,
skipp
[EMAIL PROTECTED] wrote:
I've posted this a few times...
**IF** loss on the incoming signal(s) isn't an
I used to have a RCA TV ... was a black and white ... got it back
in the late fifties.
Now I have a Sony, a Toshiba and a couple of others too.
Neil
Mark A. Holman wrote:
Say I did see a AKAI TV set there seems like they are venturing
the consumer mkt. also Sams Club carries
.. And the best part, Out Of Stock.
Should be called The Out House ... out of this and out of that.
Neil - WA6KLA
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By any chance dos anyone have the Info on the TE SYSTEMS 2210RA
220 Repeater Amp.
Happy Holidays to All
Thanks Don KA9QJG
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