We installed a small repeater system on our new fire station and are
not getting the coverage we expected at all. Our antenna sits about
27m up on top of the building. The repeater is a 50watt VHF w/
duplexer. I believe it's the old coax we are using, which I think is
about 15 yrs old and
Check out www.batlabs.com
They may have the manual(s). If not, they will have some other good info
for your radios.
William Vines
- Original Message -
From: Frederick Wong [EMAIL PROTECTED]
Date: Monday, November 21, 2005 7:43 pm
Subject: [Repeater-Builder] Service Manuals
I would
Thanks for the info! This one is in good condition, except that
the four programming switches have had the bat handles broken off! Strange.
Another project!
73 Tom/W4OKW
snip---
As previously mentioned, that is a digital metering
panel (DMP) for an MSF5000 station.
Those switches are not available from Motorola - I had
one with the same problem. Eventually I bought a junk
meter with other parts missing and swapped the
switches.
They're just SPDT switches that happen to mount
vertically with a support bracket that solders into
the circuit board. I've seen
Bob, just a suggestion, has he taken the repeater away from the site, hooked it to another antenna to see if he might be riding along a frequency there at the tower site. He could be pulling something in from a second harmonic there. The only reason I mention this, is a friend of mine had a 440
On Tue, 22 Nov 2005, Ken Arck wrote:
I'd like to try a circulator before buying one, since if it doesn't
help the situation, it's a waste of money to have it there.
---Aside from presenting a pretty much constant 50 ohm load to your
xmtr, why do you think a circulator will make a
At 04:27 PM 11/22/2005 +, you wrote:
Well, for one it will limit any locally generated mixing products
resulting from rectification in the PA transistors.
---Yes it will. But that is not the cause of desense, that is one of the
causes of intermodulation products.
Ken
At 08:15 AM 11/22/2005 -0800, you wrote:
I once had an Exec II RFPA that didn't like the duplexer load it was
TXing into. Had massive desense unless there was a circulator between the
TX duplexer.
---Makes sense. I know all about PA's driving a reactive load :-)
Ken
Could it be opposite of Sharp audio???
Chris n6icw
At 08:26 PM 11/21/2005 -0500, you wrote:
No, Ken. Flat audio is what you get when your HT is run over by
a
pavement roller.
---Unless it's a vibrating pager that is run over. Then you have a
pancake
motor.
Ken
The resistive load isn't an antenna either.
Neil
Ken Arck wrote:
At 08:15 AM 11/22/2005 -0800, you wrote:
I once had an Exec II RFPA that didn't like the duplexer load
it was TXing into. Had massive desense unless there was a
circulator between the TX duplexer.
---Makes
At 09:09 AM 11/22/2005 -0800, you wrote:
The resistive load isn't an antenna either.
---I generally face little resistance when it comes to antennae...
Ken
--
President and CTO - Arcom Communications
Makers of
My 2 cents worth...
A filter is not going to help if it is on your input.
Depending upon how much signal you have from your remote site, I would think
increasing the squelch level to the point that the un-wanted signal will not
open the squelch, but low enough that your remote site can still get
If anything is coming back down the antennaand through
the duplexer and mixing in the PA, the circulator will
prevent or reduce that effect.
Bob M.
==
--- Ken Arck [EMAIL PROTECTED] wrote:
At 06:00 AM 11/22/2005 -0800, you wrote:
I'd like to try a circulator before buying one,
since
if
This repeater is in the middle of nowhere. The nearest
house is at least 1/2 mile away. No link radios are
involved. The repeater itself, when connected to the
antenna, is the only thing putting out energy on 444.5
MHz. We see a rise in noise level on the receiver port
of the duplexer when the
At 06:41 PM 11/22/2005 -, you wrote:
Because all that unmatched stray rf is very often
looking for some place betta' (or worse) to go.
though I wouldn't qualify it as a fix for desense.
---That's my point. The symptoms (and causes) of intermod are not the same
as the symptoms (and
I looked at the duplexer with a spectrum analyzer and
a return loss bridge. It's making spec (100dB
rejection) on each side. PB loss is 1.1dB. I did
notice that the return loss indication on the SA
showed a very nice sharp deep null (over 60dB) when
looking into one port, while the other port was
At 10:47 AM 11/22/2005 -0800, you wrote:
If anything is coming back down the antennaand through
the duplexer and mixing in the PA, the circulator will
prevent or reduce that effect.
---Absolutely correct. BUT that is not the same thing as desense nor are
the symptoms the same.
You said the
At 10:54 AM 11/22/2005 -0800, you wrote:
If the PA and duplexer weren't happy together,
wouldn't I also get desense when running on the dummy
load also? Remember it's perfectly happy on a 500w
Bird load.
---You answered your own question. Suspect the antenna, feedline or both.
Ken
The antenna/coax is showing 0.05w reflected (1/2 of
the first minor division) on a 5W element in a Bird 43
with 200 watts feeding the duplexer. From a purely
VSWR standpoint, that's acceptable. Whether or not
it's 50 ohms is something we did not check yet.
Future steps include sweeping the
At 11/22/2005 10:46 AM, you wrote:
[EMAIL PROTECTED] wrote:
I once had an Exec II RFPA that didn't like the
duplexer load it was TXing into.
The duplexer shouldn't be the load...
I should have left the word load out. Technically the load was the
duplexer followed by a 50 ohm
M/A 3 PORT CIRCULATOR AND LOAD $165 + SHIPPING MDMSEE AT WWW.MDMRADIO.COMAND YES IT WAS MY INTENTION TO USE UPPER CASE
Ted Bleiman K9MDM
MDM Radio Ltd - 1629-B N. 31 st Ave Melrose Park, IL 60160 708.681.0300 fax 708.681.9800 web http://www.mdmradio.com -
Check it now!!
nevermind... solved it 0.3dB insertion loss now...
mike
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of Mike Perryman
Sent: Tuesday, November 22, 2005 12:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] tuning a
... only when you hold it out the window ...
Neil
Ken Arck wrote:
At 09:09 AM 11/22/2005 -0800, you wrote:
The resistive load isn't an antenna either.
---I generally face little resistance when it comes to antennae...
Ken
Yahoo! Groups Links
* To visit your group on
Just out of curiosity, where did the hardline come from, also, it is not Radian by any chance? I heard of that happening once to a guy who bought some cheap hardline, so he thought. Just kicking idea's around here. Mathew "Bob M." [EMAIL PROTECTED] wrote: I looked at the duplexer with a
Hi name is Carlos i am from Puerto Rico and i am
looking for a duplexer for my 2m repeater.
Carlos Quinones
WP4MXB
e-mail: [EMAIL PROTECTED]
web: www.wp4mxb.net
__
Yahoo! FareChase: Search multiple travel sites in one click.
Good Day
I would like to have comment on the use of the
compressor on the repeater hardware between the rx and
tx units , with that repeater run up using the flat
audio principle.
What will happen to the existing audio's attack/decay
stats?
The expeimental unit made for this test- specs for
(having email issues today, so if this is a dupe, please ignore)
RE: cell mixes and 440 repeater
I had a 440 repeater at a site with no other UHF transmitters for
probably a mile or two. On an adjacent tower was a cell site (this was
back in the early 90's AMPS days). When certain cell
I don't think this is a dupe.
The amp IS a Henry 20in/200out job, brand new. It has
its own switching power supply mounted on the back. I
think they're using 24V MOSFETs now. My 10in/100out
amp uses ordinary 14VDC and bipolar transistors.
I didn't look directly at the PA output. I do remember
Just so you don't have to spend more money on a new repeater after a few thunderstorms, a lightning arrestor is a must. A polyphaser is the arrestor of choice on our systems. The old feedline could be the problem as far as your coverage problems go. Some things to help determine what you
--- Dan [EMAIL PROTECTED] wrote:
Does any one have the proceedure for programming the
GLB ID chips.. I
believe its just a 2713. I have the programmer but
need help with the
code.
Dave N3CNJ
The GLB ID'er used a 2716 eprom. The way it was
programmed was to start at address 0 and
Not me, but could have been. I went to buy a piece of 7/8" hardline a few years back, thought the deal was to good to be, then found it was Radian. No the other guy put up 150' of it, only to find it would not work.Mathew Chuck Kelsey [EMAIL PROTECTED] wrote: So how much did you end up
Say Kevin;
If the interference is coming form a Part 15 device
and IF on a licensed ham freq. it is called a incidental radiator, the
FCC does send NAL's. research the ARRl web page for history of
incidential radiators good info when you ask the owner to change
channels or
yeah i got your message but i replied in lower case btw happy turkey
day .
m
Ted Bleiman K9MDM - MDM Radio wrote:
M/A 3 PORT CIRCULATOR AND LOAD $165 + SHIPPING
MDM
SEE AT WWW.MDMRADIO.COM
AND YES IT WAS MY INTENTION TO USE UPPER CASE
Ted
Looking a few things for a RCA 500 Repeater;
pl reeds - 77hz
Mic
Please contact me direct.
Thanks!
Robert
KD4YDC
Yahoo! Groups Links
* To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
* To unsubscribe from this group, send an email to:
[EMAIL PROTECTED] wrote:
See a blurb I wrote a few years ago on repeater-builder.com regarding
audio processing in narrowband FM.
That would be here:
http://www.repeater-builder.com/tech-info/audioprocessing.html
Kevin
Yahoo! Groups Links
* To visit your group on the web, go to:
Robert,
I think those are the same reeds that are in a Motorola radio, at least in
the Vibrasponder style (I think). Man, I did not think anyone else had or
knew anything about those old radios! I have four of them here in storage
and have been wondering what I am going to do with them. They
No they are not - although they look the same same as the
Motrac, Mocom-30 70, and Micor encoder reeds ... they are not
interchangeable.
The internal coupling is the difference.
The Motorola K-1000A series reeds seem to work ok though.
Neil - WA6KLA
Paul Finch wrote:
Paul,
I have three RCA Series 700 base stations and some CC20 remotes
to add to your 'collection.'
Please let me know when you'll be here to get them,
Neil
Paul Finch wrote:
Robert,
I think those are the same reeds that are in a Motorola radio, at least in
the
Neil,
That's a dirty word right now, I am doing some serious house/garage/shop
cleaning. I have thrown out such things as KAAR DT-83's, Sat controllers
and BBL System III paging terminals!
Paul
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf
Neil,
I remember that now, it was the 1000 series of reeds that would interchange.
Been way to long.
Paul
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of Neil McKie
Sent: Tuesday, November 22, 2005 9:23 PM
To:
Hi Guys,
Thanks for the advise so far.
I have just been up to the repeater site today, and have tightened up the
squelch some so it does not open so easy.
The offending signal is still there, and I can hear it on the input of my
mobile radio.
For information, here in New Zealand we have a Gov.
In Queensland we have to also track down the offending signal .All we use is a radio ,a beam ,and aunit that reduces the signal when you get closer and we have no problem finding signals and where they come from.
Thank You,
Ian Wells,
Kerinvale Comaudio,
www.kerinvalecomaudio.com.au
Kevin,
I strongly recommend CTCSS over DCS. It's hard enough to tweak commercial-grade
radios to have exactly the right digital waveform to reliably encode and decode
DCS, but Amateur-grade transceivers are not nearly as reliable. Also, the DCS
turn-off code is always a 134 Hz tone, regardless
Hi all,
Not repeater related directly, but have run across a few Maxar 80's in
storage and wondering what they are. Know zilch about Moto model
numbers, and figured this group would have someone that knows.
Model: D04TSA3300BK
The box has a label that they're UHF 4W.
Also if anyone remembers
Bob,
Depending upon the frequency band and the modulation being used, it's
possible that the cellular transmitter is radiating a low-level spurious
signal. All cellular telephone sites transmit one or more control
channels continuously, and the associated mobile units home on this
channel to
Hi Nate,
You have what was called the 2 Watt LPI (low power-industrial) version
of the UHF Maxar 80. The model number would indicate that it is a 2-
freq radio with tone PL.
The cover can be removed by disconnecting the mic connector on the
side of the radio and removing the knobs (they pull
At 09:21 PM 11/22/05, Nate Duehr [EMAIL PROTECTED] wrote:
Hi all,
Not repeater related directly, but have run across a few Maxar 80's in
storage and wondering what they are. Know zilch about Moto model
numbers, and figured this group would have someone that knows.
Model: D04TSA3300BK
The box
I second this suggestion. I use
Polyphaser arresters, and have been quite happy with them. Youll know
when they take a hit. wink
I also have some questions for the original
poster, though.
You mentioned that the antenna is about
27m up on top of the building. Did you mean 27 FEET?
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