John Mackey wrote:
Anyone have any opinions on the Diamond X-50NA? I have an application
to use it for a simple repeater on UHF.
Out of all the Diamond, Comet and similar antennas on the market I have
experience with the X-50 the the only one worth buying. I have a X-50
that I bought
I've seen several instances where doubling the antenna hight typically
adds about 20 percent more coverage over normal terrain. Of course this
has it's limits since the earth hasn't been flat for many hundreds of
years. I once saw a SMR operator spend about 100K to go from 200 feet
to 450
Paul Finch wrote:
The hard hat is a OSHA regulation..
And it's a good one. There's no way to be sure there isn't some loose
hardware overhead that may be shook loose while climbing. Also a hard
hat will save you head from banging into an overhead side mount or guy
wire. I've had
I've never used the C-Tape but I suspect it's the same stuff available
at marine supply stores called Rescue Tape.
http://www.rescuetape.com/
Dex
Jim Cicirello wrote:
Hi Guys,
A cell phone Tower Tech. gave me some Cell-Tape (C-Tape) for weather
proofing connectors. I used some tonight on a
I was given several of those about 20 years ago. At that time they
appeared to have been in use for at least 20 years so I suspect the
design goes back at least into the 60's. My guess is they were made by
Phelps Dodge which was a popular commercial antenna manufacture during
that time.
Ken,
Going to attend the Southeastern VHF Conference in Orlando? If so I'll
be looking for you.
While traveling I-95 thru NC you will find good coverage from the
Brodway repeaters.
147.105 +
0
Click here for More Info
I've tried several ways to put the link together with no success. These
don't work for me:
http://www.good-times.webshots.com/album/562985533mLTuoH
http://www.goodtimes.webshots.com/album/562985533mLTuoH
Is the picture still available?
I've seen some 40+ year old towers that are still in
Thanks Paul. Guess I picked up the www by clicking on the first part of
the original link then pasting the work wrapped part.
If that tower was in my area there is a local crane operator who would
lay that stick down for less than $500 and no one would even have to climb.
Dex
Paul N1BUG
Wasn't the original post on this subject about the emails sent directly
to the repeater-builder webmaster and owners and not about the post that
are made to the email reflector? If so I believe this discussion has
got off course.
Dexter
Ken,
I've had that problem on several systems. Running shielded CAT5 took
care of most of the noise. I still can detect the noise on a very weak
carrier received by the UHF repeaters but it's not bad enough to degrade
service. The interfering signals aren't present all the time. They
seem
jimmyrtle wrote:
Has anyone ever used this website for predicting repeater coverage?
I'm not sure what the dBuV/m values for the coverage display should be.
Any suggestions?
Thanks,
Jim
Just tried it Jim and it tracks very well with the coverage I get from
several sites.
Thanks for
The most reliable solution is to just break those flimsy socket pins off
and solder the wires directly to the transistor leads. I've had several
supplies fail because of these type sockets. I suspect the transistor
may have failed because of the heat produced by the small contact area
of the
[EMAIL PROTECTED] wrote:
Any suggestions on what to use for a jumper between the
Heliax and the antenna for the last few feet to provide
flexability and make it easier to get the cable into the
antenna mount?
RG-214
Dex
[EMAIL PROTECTED] wrote:
2M and it's a 50' run of LMR400 with a short coax jumper
at the antenna.
At 150 MHz 100 feet of LMR400 has about 1.5 db loss
At 150 MHz 100 feet of LDF4-50 has about 0.815 db loss
Your 50 feet of LMR400 if good has about 0.75 db loss
And if replaced with 50 feet of
Fred Seamans wrote:
Not all WD are experimental calls. My XYL had WD5DXK call as a
General until she let it expire in Oct. 2006.
All the experimental calls I know of with a WD prefix are
WD2. I hold WD2XKO authorized for 2200 meters (137 kHz) and
am one of the WD2XSH 600 meter (505 kHz)
Nevada Amateur Radio Repeaters, Inc. wrote:
What is the allowable deviation for a two meter digipeater in amateur
service? Is 15 kHz excessive?
Yes 3.5 to 4.0 kHz will work fine when received by a
properly set up digipeater.
W4DEX
William A. Fourneau wrote:
PLEASE I NEED HELP TO MAKE THE WIRING BETWEEN A REPEATER AND A
DUPLEXER, OF WHICH SO LARGE THE WIRING IS PLACED THAT CONNECTS THE
REPEATER WITH THE DUPLEXER.
La necesidad del cable para sólo ser de alcanzar lo
suficiente. Ninguna longitud especial es requerida.
retiredcss01 wrote:
I've got a class of new prospective Hams and I am using the cwid as a
project. The info I got off repeater-builder is not clear enough for
me to proto a board. Does anyone have a good copy of the component and
solder side of the pc board?
The front cover of the manual
Gerald Bishop wrote:
Hi- Kind of off subject- our group was given a bunch of RG177U,Looks
to be heavy duty coax. Would anyone know impedance ,and if it can be
used for repeater usage? Tks,Jerry
Seems to be 50 ohm: http://www.rfcafe.com/references/electrical/coax_chart.htm
Dex
skipp025 wrote:
A big thank you to Dexter for making his COR-2 scans available to
Chris I.
Glad to help. Getting rather old myself I have a lot of older manuals in my
file cabinet. Certainly to much to set down and scan it all so I've been doing
it on an as needed basis. Here's an index
I'm fairly sure I have a copy. If no one else replies soon I'll scan it for
you.
Dex, W4DEX
kt4xa wrote:
I'm looking for the manual for the original Hamtronics COR
module--that is, the OLD one from the early 80's that predates the
COR-2 and COR-3. Hamtronics no longer has the manual, and I
Mike Morris WA6ILQ wrote:
I've had no problems after I put a o-ring around the center pin and
pushed it up inside the plug.
Great idea Mike! I can see how the o-ring will keep a little pressure on the
connector threads to keep it from vibrating loose.
Thanks,
Dex
The only sure way to keep these silly connectors from coming loose is to use
Lock Tight! No other way to keep them on when the radio is installed in heavy
equipment and farm vehicles. Just make it permanent and when the radio needs
to
be removed cut the coax and make a pig tale of it with a
Wby would you even use pl259 connectors on uhf ?
Because a PL-259 is required for the best mobile UHF radio ever made. Motorola
Syntor X
W4DEX
Gary wrote:
Yes I know you can plug an N connector into a bnc.
Yes you can but I believe you will find the pin on a N male is larger than a
BNC
female is designed to take. A 75 ohm N pin is probably close to the same as a
BNC. Years ago after finding broken BNC jacks on some high
Anyone familiar with the RELM SMX921 repeater? I wonder if the VHF model will
program down into the ham band?
http://www.relm.com/spec_sheets/SMX_921.pdf
W4DEX
The best 802.11 units for the money I found are the Senao NL-2611CB3 radios.
They run 200mw and there is also a 400mw version. Also the receivers in these
units are better than most low end radios. I have a 2.5 mile non line of site
path working with these units for two years now with no
Anyone have any experience with this device?
http://www.dingotel.com/2way/index.asp
Dex
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]
* Your use
Someone suggested an ID board listed on eBay. I was looking for a cheap
versatile ID board for a microwave beacon so I bought the kit. It
arrived promptly and I assembled it this morning. It took maybe one
half hour to install the components on the board and have it connected
to the
Fred Fitte wrote:
Having a radar unit is perfectly legal.
But using it on the highway can get you in trouble. I know someone who
almost got boxed up by a group of 18 wheelers when they figured out the
signal lighting up their radar detectors was coming from a personal
vehicle. A lot
Anyone have an idea how much power would be saved by running a MSF-5000
that is idle most of the time from a switcher instead of the stock heavy
iron power supply?. The transformers produce a lot of heat just in
standby mode. I have several of these machines on line and also a GE
repeater
Depends upon your terrain. If you are in the flat lands I would suggest
the 420. Otherwise I would use a 408.
W4DEX
georgiaskywarn wrote:
I am curious if anyone has gone from a DB420 to a DB408 (or the other
way). I may have to go up on another tower (before the present tower
I am on comes
Dave VanHorn wrote:
If you've not seen what happens in southern CA with the Santa Ana
winds, you'd never believe it.
AMAZING levels of noise right across the VHF spectrum.
AFAIK, not much you can do about
that.
Kevin Custer wrote:
Charged particles of dust, rain, snow, or anything else
Don wrote:
The Morse code team will consist of Chip Margelli K7JA and Ken Miller
K6CTW.
Chip and Ken do a lot of contests and DXpeditions. Joe Drago, props
manager for the show is KF6OCP.
Chip and Ken did a great job, especially with the pressure of being on
TV and with the audience
I understand your frustration Mark. However each time I've done a phone
order from Bomar they have told me the total for the order while on the
phone. They started the $50 minimum order several years ago but I don't
see any mention of this on their web page. I've had a few problems with
Chris Peterson wrote:
Thanks very much for helping not only identify these, but find docs for them
also.
Thanks even more for not letting this degenerate into a flame war about VHF
Engineering.
I think this is the first time a VHF Engineering question has been asked
without a bunch of
Benjamin Naber wrote:
Here's something else to be figure out
Who invented the cell phone and what was the
original use? And where was the first tower installed?
The subject is OT but..somewhere I have a late 70's ATT Bell Labs
Record magazine which featured this new technology.
Jeff Corkren wrote:
Where is the best place (other than Astron) to purchase 2N3771 pass
transistors for a Astron power supply ?
I recently ordered these from Digikey. Have also seen them listed on
eBay from a guy in NJ.
Dex
Yahoo! Groups Links
* To visit your group on the web, go
Perhaps the repeater buyers would like to start a Repeater-Buyers
group and leave the technical challenges to real repeater builders.
Dex
Yahoo! Groups Links
* To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
* To unsubscribe from this group,
I agree in general that converted mobiles make good ham repeaters. But
if I wanted a compact energy efficient repeater I would consider using
the Hamtronics boards. I've had lots of experience with both units on
VHF and UHF. The Hamtronics boards will cost you a lot more but you
will learn
russ wrote:
I would like to thank every
one who told me about the DB-228!
Wow! You guys where right! I bought
one last week and it got installed this
morning in Ocean City NJ. I now can
work the 147.285 in Glassboro NJ
mobile! On the DB-224 I could work
it from the base but not mobile.
TOM MANNING wrote:
Glenn and T.J.
If my memory serves me well the RG-55 was replaced with RG-223/U
Tom Manning , AF4UG
I have several fairly new BNC cables labeled RG-55/U made by Fujikura.
I think they came with an Anritsu Site Master.
Dex
Yahoo! Groups Links
* To visit your group
Anyone know of a source for the load resistor which is used in a
IFR-1200S service monitor? The device is labeled ACR 0603, CR1060. A
picture can be seen at:
http://w4dex.com/temp/ifr_1200s_power_sensor.jpg
Thanks,
Dexter
Yahoo! Groups Links
* To visit your group on the web, go to:
Benjamin Naber wrote:
thought the same you did, but nope didn't help
Any one else?
I suspect the addition of the arrestor changes your match because the
antenna isn't properly matched to begin with. Try adding adapters to
the coax equal to the length of the arrestor to see if you get
Mike WA6ILQ wrote:
Do you, by chance, have a manufacturer's name?
product info (i.e. product name, part number)?
Is one known to work better then the other?
GC Type 44 I think is a non silicon heat sink compound. I used it while
working with ATT on microwave TWT amps. It also has/had a
I have used the mgf1902 to replace 1302. The 1902 is available from
Down East Microwave. Very nice people to deal with. You will find the
1902 listed about 3/4 way down on this page:
http://www.downeastmicrowave.com/cat-frame.htm
GL,
Dex
w9mwq wrote:
Anyone have a good source available for
Rick - VA3RZS/Charlotte - VA3CMR wrote:
was looking for a little more info then that ..
will it move down to the ham band .. has any one cracked it open to
retune it ?
Rick,
I can't help you with any details on the antenna you have but I did once
work with 225-400 MHz ground to air
A pair of Syntor UHF units configured as a repeater has performed flawlessly
for several years at this site:
http://www.w4dex.com/kc4fwc/444575.htm
Dex
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
This subject is one of those that seems to make a regular appearence on this
reflector. Since there are may repeaters sending the automatic wx alearts I
think
if the FCC saw this as a problem someone would have been reprimanded for doing
so.
Anyone aware of this happening?
Dex
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