hey this is dustin kd5ood im a ham and a oklahoma army mars member in
comanche oklahoma i have been working on a repeater for mars and i was
wondering if anybody hand any equpiment for sale or to donate thanks
Hi all! If a piece of coax is sitting at ground and you suddenly attach a
battery (DC) across it, you're really talking about a step function change in
voltage which carries a wide spectrum of high frequencies The 'change'
propagates down the coax at near the speed of light as expected. True
Dustin,
I don't have any equipment at the moment I can donate, sorry.
One word of advice on the MARS repeater. Most often in the VHF range MARS uses
143/148 frequencies with 5+/- offsets for repeaters. We hams use 0.6 MHz
offsets and we normally have to use large expensive duplexers,
Although I think most coordinating councils do a good job, they do here in
Florida, I really do not want the council telling repeater builders what
equipment to use. They come up with the most stupidest and crazy ideas every
once in a while. The policies are decided in a board room, nice and
Gary,
Now I know you are kidding, hi.
73, ron, n9ee/r
From: Gary Schafer [EMAIL PROTECTED]
Date: 2007/09/01 Sat PM 08:58:13 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers
How do you know it is not 75
Gary,
I don't know. Why don't you tell us.
I don't know why gravity will pull me to the ground real fast if I jump off a
bridge, but I have all the faith in the world it will. Einstin tried to
explain it, but died before he got the results.
Taking the word of good test equipment is a good
Bill,
The UHF Micor receivers are pretty much standard in all Micor radios. Probably
cheapest and best place to look is for a mobile which can be had on e-bay for
$10 plus $100 shipping. The receiver is a simple remove (it unplugs), insert
in your repeater and tune.
If you could talk the
The question is way off base. No one said one cannot carry
DC or any other signal on coax. The question was what was
the impedance of a coax at given frequencies.
You said coax has a low-frequency cutoff. I'm asking about that
specifically. I didn't ask about about impedance.
At DC I
I have an idea for everyone. I have not tried this yet...so if
anyone has...and has had issues...LET US KNOW. I have a db420 that
we are putting up on a 300ft tower here in metro ATL.
This stuff is not only used on aircrafts, but look down at the very
bottom of the page. When shooting
I think we're talking apples and oranges here. A hollow waveguide of a
specific dimension does have a low-frequency cutoff point, below which a
wave cannot propagate through its length. But, a coaxial cable is not a
waveguide, and it does not have a low-frequency cutoff.
73, Eric Lemmon WB6FLY
Thanks Ron for the input. I will look for a used mobile UHF
Micor.
The ironic thing is that I work for Freescale Semiconductor,
we used to be Motorola. I have been there 22 years. I most
likely helped build the IC I need.
Bill
- Original Message Follows -
From: Ron Wright [EMAIL
You just want to remove the tarnish, not dissolve the
metal. Muriatic acid is probably way too strong, not
to mention toxic, even when you know what you're doing
while using it.
Depending on how much elbow grease you want to expend
(I'm all for soaking the can in some kind of solution)
you could
From: Eric Lemmon [EMAIL PROTECTED]
Date: 2007/09/02 Sun AM 09:47:30 CDT
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Low-Frequency Cutoff (Was: Duplexers)
I think we're talking apples and oranges here. A hollow waveguide of a
specific dimension does have a
At 9/1/2007 16:45, you wrote:
I really do not see a problem with D-Star repeaters existing with analog
as long as D-Star follows the analog band plans set forth by the repeater
councels.
We've been trying to co-channel D-Star with analog systems it hasn't been
working well. Kind of like
At 9/1/2007 16:51, you wrote:
[EMAIL PROTECTED] wrote:
At 8/31/2007 11:18, Nate Duehr wrote:
FYI.
Cross-posting to IllinoisDigitalHam list and Repeater-Builder list from
the [EMAIL PROTECTED] list.
Thoughts folks?
Thanks to Mark N5RFX for doing real testing.
Thanks Nate.
At 9/1/2007 17:01, you wrote:
Bob,
Part 97.201 reads:
(b) An auxiliary station may transmit only on the 1.25 m and shorter
wavelength bands, except the 219-220 MHz, 222.000-222.150 MHz, 431-433
MHz, and 435-438 MHz segments.
This is outdated.
However, this is from Part 97 dated Oct 2006. I
At 9/1/2007 21:17, you wrote:
- Original Message -
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, September 01, 2007 5:35 PM
Subject: Re: [Repeater-Builder] Re: subaudibe tones..
[snip]
You guys have control of the quality level of the equipment used
Jeff,
Impedance refers to both R and X, resistance and reactance. Impedance affects
all current flow, DC and AC. X affects AC only.
Yes DC is steady state. Guess you can get the simple stuff.
No a coax will not function the same at 5 Hz as it does at 2 meters.
Evidently you have not had
Hey Folks,
Got a Moto S1327B service monitor whose scope is sick. Traced the
problem to the IC... Problem is my book calls for a MC1357P chip.
TV/FM Sound IC...but in my scope it is a different chip and different
pin outs. My chip has number: FU6A7754394 which I suspect is a moto
number.
At 9/2/2007 04:38, you wrote:
Although I think most coordinating councils do a good job, they do here in
Florida, I really do not want the council telling repeater builders what
equipment to use.
We don't tell or even officially recommend (coordinate) specific types of
repeater equipment. We
Ah, I didn't think of tapering. Obviously a good idea in this
application. Thanks for the details.
I see we're off topic, so I'll stop now.
Regards,
Jeff W6JK
--- In Repeater-Builder@yahoogroups.com, Jim Brown [EMAIL PROTECTED] wrote:
On the E-4 aircraft we delivered to the Air Force, the
Ron,
Remove the F and you have a Fairchild part number- although it's probably
obsolete. The 7043 is likely a date code.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of rwjohn49
Sent: Sunday, September 02, 2007
Impedance refers to both R and X, resistance and reactance. Impedance
affects all current flow, DC and AC. X affects AC only.
Impedance is specific to AC. There's no such thing as impedance at DC, only
resistance. Look up in the definition of impedance in any engineering text
and you'll find
[EMAIL PROTECTED] wrote:
At 9/1/2007 16:51, you wrote:
[EMAIL PROTECTED] wrote:
At 8/31/2007 11:18, Nate Duehr wrote:
FYI.
Cross-posting to IllinoisDigitalHam list and Repeater-Builder list from
the [EMAIL PROTECTED] list.
Thoughts folks?
Thanks to Mark N5RFX for doing
Ok. Coax doesn't have an impedance at DC it has a resistance.
Coax impedance is found by:
Zo = sqrt [ (R +j 2 pi f L ) / (G + j 2 pi f c) ]
where:
f is frequency
L is inductance
C is capacitance
R is the resistance
G is shunt conductance in mhos caused by the dielectric
j is of course
There are a couple of Micor receivers on E-Bay right now
- Original Message -
From: Ron Wright [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, September 02, 2007 6:55 AM
Subject: Re: [Repeater-Builder] Micor UHF RX IC needed M6707
Bill,
The UHF Micor
More garage and housecleaning... got to be out of the house in 20 days or so...
Make offer...
Two GE M2 mobiles - no cables or heads.
Looks like 40w UHF.
ARRL amateurs manuals from 1942, 1954, 1956, 1964, 1977, 1978
Callbooks from 1974, 1978, 1980.
If they are of any use I will GIVE these to
Jesse,
You got it, well said.
If you take a simple 100 ft piece of 1/4 superflex a typical value for its
C=2400pf, L=6 uH and R=570 Ohm.
At 5 Hz the Ls and Cs mean little compared to the R.
At 10 MHz Ls and Cs mean a lot compared to the R.
One can see there becomes a point where the coax will
Hi Bob,
Well...I can dissolving the metal would not be good ;-)
The thing that impressed me about the TarnX was that it really got in
every nook and cranny...that you can barely get hands into. What
about a very deluted solution? I am sure what acid that is TarnX is
pretty deluted.
Robert
Jeff,
I have plenty of text books here, oh well. All refer to impedance as Z and
Z=R+jX or Z = magnitude and phase angle. A 500 Ohm resistor has an impedance
of 500 Ohms or 500+j0 or 500 0 deg phase.
I think in Jesse's and my last posting you might see about the low and high
freq
From the smell, I always assumed that TarnX was a dilute sulfuric acid
solution. The real key to using it was to QUICKLY flush the treated item
with LOTS of water. (I would recommend distilled water if you are going to
try and use it on a duplexer...)
- Original Message -
From:
--- In Repeater-Builder@yahoogroups.com, georgiaskywarn [EMAIL PROTECTED]
wrote:
Had an experience with using TarnX in cleaning some Moto cans. Had
a
friend of mine that used this with great success. I used it...had
issues. The difference is he used running water when I used a pan
of
Why is everyone so crazy to clean the inside of Motorola
T-1500 duplexer bottle body with cleaners?
Unless there is some pitting on the plunger body... you need only
blow out the dust, put a little tiny bit of lube (I use dry silicon,
teflon, or Amsoil MP) on the threaded shaft and slowly
So to plug some numbers in:
Say you have a cable with the following specs (50 ohm cable)
Capacitance of 100.3 pF/m
Inducatance of 251 nH/m
Resistane of 0.164 ohms/m
Shunt conductance of 12.8 mS/m
Zo = sqrt [ (R + j 2 pi f L ) / (G + j 2 pi f C ) ]
at 100 Hz= 113 ohms
at 1 Khz= 111 ohms
at
I agree skipp, just lube it up and use it... unless it was buried in a pile
of sand I cant see many benefits to cleaning it, other than getting familiar
with the inside of a duplexer. Generally I don't ever open duplexers, a
pain in the neck to take a part and way to easy to mess up putting them
Hey Guys,
The schematic on the website of this card doesn't have the Intercom
switch/button on it. From what I've read there are 2 versions of this
board, the one published on the site and the one I have. The boards
appear very similar, mine just has a few extra parts on it for more
features I
Ron and Eric,
I emailed this out before, here goes again. I learned all I know about the
DB antennas from two of the engineers that designed the antenna many years
ago. My Boss at the time was a personnel friend of one and the other ended
up at Wacom where I did a lot of business with him. I
We had a VHF 70mhz once have other frequencies coming through and on
inspection we found a small area of corrosion in one tin at the base plate
once cleaned all ok again .
Thank You,
Ian Wells,
Kerinvale Comaudio,
www.kerinvalecomaudio.com.au
---Original Message---
From: Jesse Lloyd
Jesse,
What number is stamped in black ink on your card? I'll see if I can dig up
the data. I see at least seven different AS cards used in the MSR2000
station.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of
Its a TRN 9689
On 9/2/07, Eric Lemmon [EMAIL PROTECTED] wrote:
Jesse,
What number is stamped in black ink on your card? I'll see if I can dig up
the data. I see at least seven different AS cards used in the MSR2000
station.
73, Eric Lemmon WB6FLY
-Original Message-
From:
Paul,
Prior to putting up our DB224 we coated the connections with a commerical
coating for antennas. It was from a local broadcast station who uses it. Not
sure if same 3M product you mentioned. It was gold in color and really stands
out on the antenna. This has been done on a number of
Jesse,
I have the info for that module, and I will scan it and send it to you
directly.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jesse Lloyd
Sent: Sunday, September 02, 2007 3:50 PM
To:
Sounds good, thanks!
Jesse
On 9/2/07, Eric Lemmon [EMAIL PROTECTED] wrote:
Jesse,
I have the info for that module, and I will scan it and send it to you
directly.
73, Eric Lemmon WB6FLY
-Original Message-
From:
But it is your statement.
73
Gary K4FMX
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Ron Wright
Sent: Sunday, September 02, 2007 6:46 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE: RE: RE: RE: RE: Re: Re: RE:
Yes Ron, a tongue in cheek reply, but not entirely.
73
Gary K4FMX
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Ron Wright
Sent: Sunday, September 02, 2007 6:40 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE:
I was wondering when someone was going to dredge that up from the Beldon
papers. Good going Jesse.
But that still doesn't mean or show that coax cable has a low frequency
cutoff or that it stops looking like or acting like a coax cable at low
frequencies. It tells us that other factors come into
My reply was a tongue in cheek reply to try and inspire some explanations
rather than the just because it is kind.
You are correct about steady state DC. Just food for thought In order to
get to that steady state at the far end of the cable you must first apply
the DC at the opposite end. It
Wow that stuff is expensive...when I did a search on it. What were
you paying for that.
Skipp...I know what you are saying on cleaning of them. I guess I am
looking at trying to make the things as clean as possible. You would
think that a tuned circuit would have issues with extra stuff
Isn't it interesting to note that the impedance goes UP at low frequencies
but not by leaps and bounds.
However you didn't say if the R resistance in the equations is DC
resistance or AC resistance?
If you also look in those Beldon papers you will see that the
characteristic impedance of
Ron,
I can't stress the importance if tightening ALL of the hardware on the DB
antennas, they were built for the low mount and top of tower installations.
It sounds like loose connections from the factory is what your static
problems are. I can't tell you the number of antennas I have prepared
Does anybody have and notes or down n' dirty drawings on best practice
for integrating a ts-64 to the msr2000? I think my PL card is flaky, and
I have a space ts64...
--
Jay Urish W5GM
ARRL Life MemberDenton County ARRL VEC
N5ERS VP/Trustee
Monitoring 444.850 PL-88.5
I mean spare ts-64 :)
Jay Urish wrote:
Does anybody have and notes or down n' dirty drawings on best practice
for integrating a ts-64 to the msr2000? I think my PL card is flaky, and
I have a space ts64...
--
Jay Urish W5GM
ARRL Life Member Denton County ARRL VEC
N5ERS VP/Trustee
Correction to below: Change the word frequency to wavelength. It should
read;
There is no high frequency cutoff but as the spacing of the center
conductor and shield gets larger compared to WAVELENGTH a point is reached
where the propagation mode of the cable changes and other modes come into
While that is true, when an applicant applies for frequency
coordination, he is asking for specifications that will allow him to
receive a coordination. As such, those limitations/specifications are
largely self-imposed. That is what he is willing to do to receive
coordination. Some people will go
Might anyone have a configuration manual for the ZR340? I had one,
but can't seem to find it at this time. It's only a few pages. Maybe
scanning and e-mailing it to me. If so, many thanks !
Paul Metzger
K6EH
[EMAIL PROTECTED]
I purchased a COM3010 shortly after it was released and have been
extremely happy with it. It has gone back to the factory for
complete software and calibration upgrade once since new. Ramsey
says they have sold over 400 of them since release.
Pros:
Small, light, easy to operate and carry to
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