[Repeater-Builder] Asntenna Painting
I am seeking advise ...but if I can be pointed to the right direction, I will be most appreciative. This summer, I plan to take down my Cellwave Station Master (repeater antenna) for service, maintenance or painting. Over the years, moss and algae set in and the bright white fiberglass finish is beginning to disappear. I seek advise on the following: 1. What cleaning agent would be best to take down foreign objects in the antenna 2. What paint if any...or preparation therof before application is neglegible in the optimum performance of this antenna. This antenna has served us well over the years. 3. Other recommendation. thanks chris
Re: [Repeater-Builder] Re: air com
I enjoyed transacting with air.com with Sid Cohen...go out his way to help you out..Lately the atmosphere (customer relation) at air.comm is totally different...I am not sure that Sid Cohen is still around. I will dig up their phone contact. \ csi --- On Tue, 9/16/08, skipp025 [EMAIL PROTECTED] wrote: From: skipp025 [EMAIL PROTECTED] Subject: [Repeater-Builder] Re: air com To: Repeater-Builder@yahoogroups.com Date: Tuesday, September 16, 2008, 7:10 AM Always makes me think of a Mel Brooks Movie... don't know why. Air-Comm sells a lot of stuff on Ebay... forgot their ID but I see them listing surplus radio items fairly regular (regular being the time between item listings, not the people). :-) Their contact phone number is provided in their auction listings. cheers, s. ask for Sid Does anyone have a phone number or web site address for Air Com in Phoenix. The aircom.com does not look like a place that sells used stuff! Yahoo! Groups Links
Re: [Repeater-Builder] Measuring Coverage Area
The Island Way: I used my IC-28H..(mobile) .which has led bars on rx signal strength. I drove around the island and map out receptions on strategic points. Clients are satisfied that a 15-watts tx at repeater site covered the whole island (32 square miles). Repeater located at center (highest point) of the island about 1700 ft. above sea level...coverage of 20+miles easy. All system powered by solar power. my 2-cents. Chris Mariana Islands Nate Duehr [EMAIL PROTECTED] wrote: Mike Besemer (WM4B) wrote: Whats the most accurate down-and-dirty method of measuring the footprint of a repeaters receiver coverage? I know the whole question sounds like an oxymoron, but inquiring minds want to know. de WM4B Mike Down-and-dirty: Drive around and see where it covers. Write on napkin from fast-food joint. (GRIN) Really-Fancy Down-and-Dirty: Find some software to plot received signal strength from a connected radio at regular intervals that also logs GPS data. Coverage for a repeater is reall a function of two things, the transmitter coverage and receiver usable sensitivity. You can build a system that transmits well but can't hear anything (alligator), and vice-versa (elephant). With that said, assuming your system is relatively balanced and youre engineering is right for both... Transmitter coverage is the above drive around method (well, if you can't key the repeater from where you can hear it, you might find out you're not as balanced as you thought you were). Receiver usable sensitivity (not just raw sensitivity, but sensitivity while hooked to the antenna system including noise and any interference present) is measured at the site. There's a nice article on the RB website about how to do that measurement, I believe. You can only extrapolate from there, because you don't know what the mobile rig's RF output, feedline, antenna, and height will be... so you just take something average and do the math from there to see where the repeater will hear. (The most often used method here is just to go for the maximum usable receiver sensitivity that you can possibly squeeze out of your system and not worry about where it will theoretically hear. Push the number as low as you can without getting into the noise floor of the site or the noise figure of the radio -- since you're probably adding a pre-amp to get there on most receivers, even modern ones.) A another more engineering method would be to get a theoretical coverage pattern would be to use RF coverage prediction software and with good measurements of power output and the manufacturer's specifications for the antenna gain, you could build maps like this one: http://www.colcon.org/fig/thorodin_coverage.gif But you still have to go compare the map to the real world with real radios at some point. How much of that you do, all depends on how precise you want to be about it and how much time you can dedicate to the process. (GRIN) Free software is available for predication that does a decent job for the prediction part of it, and commercial software ($$$) will be marginally better at the analysis, and perhaps easier to use. (I don't know -- I don't use commercial software. http://www.cplus.org/rmw/english1.html - RadioMobile Software The free stuff is good enough almost all of the time for your personal use. If doing reports for others, the liability issues might drive you into the arms of a commercial piece of software. Many 2-way shops will do this type of thing for a fee, also -- if you're not the do-it-yourself type and don't have any friends in the biz. Of course all of the above also has other real-world realities that affect it... multi-path, interference sources off-site that don't bother the repeater but bother the end-users, adjacent channel interference/problems, etc etc etc. Just shoot for the best receiver sensitivity you can muster, engineer that in from the very start, and do it right (proper bandpass or other filtering, and pre-amp with the right amount of gain for the Noise Figure of your chosen repeater's receiver) and the transmitter at something reasonable... 50W out the duplexer (after duplexer loss, isolator, etc.) to the antenna is very similar to what the mobiles are going to push back toward the repeater... HT's 5W... So you can see it's really easy to build an alligator. There are solid engineering reasons to build an alligator at times (remote receiver sites, need for building penetration for listening to the machine on HT's while someone will talk back on a fixed mobile in the building, etc.)... but mostly a balanced to slightly alligator system works best for the users. They can listen to the repeater to get a feel for how well they'll be into it... a major alligator never gives that kind of user feedback loop to the end-user... they hear it well everywhere and can't figure out why they can't get into it reliably. Nate WY0X
[Repeater-Builder] simple repeater
I have access to IC 28h mobiles and intend to make a repeater out of two mobiles. ...not for heavy use...but casual ...club use...5-10 watts tx. will be sufficient ...will be powered by solar ...not too sure whether to use duplexer or two antenna ...to make it portable to readily move to another location and access (program directly by dial) other repeaters. any idea from this group...whether this radio is reliable for this application.? thanks chris - Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now.
Re: [Repeater-Builder] Repeater on Portable Radios
I am grateful to all who pointed out ...heads-up... on using 9913...I was just pointing out what I have in preparation...In actuality we do have sufficient run of Andrew Heliax of which we will eventually use. thanks csi Chuck Kelsey [EMAIL PROTECTED] wrote: About twice a month this topic comes up. The answer is always the same Don't use coax with foil/braid shield in duplex service Don't use coax with foil/braid shield in duplex service Don't use coax with foil/braid shield in duplex service There are isolated reports of people using it with success, but save yourself the expense, grief and time. Maybe Kevin needs to put this message on every email that appears on Repeater-Builder ;-) Chuck WB2EDV - Original Message - From: To: Sent: Thursday, October 18, 2007 6:10 PM Subject: Re: [Repeater-Builder] Repeater on Portable Radios I thought LMR400 was supposed to be good on 2m. That is what I am using. Maybe that is part of the problem I am having. Is LMR600 the same way? I am running that from the antenna to the duplexer only. Everything else is double shielded. Yahoo! Groups Links __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
[Repeater-Builder] Repeater on Portable Radios
For our American Red Cross use...local chapter We are in a project to make a simple repeater from two IC H-16 VHF (donation) to assist us in our immediate response in a small community (outside of continental U.S.). 1. We are looking for a simple controller, no bells and whistles,, just the cables coming out of the controller and plugged into the audio/ptt to activte the repeater. We would like to have this controller encased. We now have the following: a. 9913 coaxial cable b. solar panels c. auto batteries d. access to 200 ft. tower e. station master cellwave antennae 1. We do not intend to use duplexer. aa. the ic- h 16 would be primary repeater. bb. we are using Ht-600/mt-1000 portables cc. we are always looking out to purchase (shallow pocket) ht-600/mt-1000 vhf...proven to be a workhorse in our harsh salty environment (island close to salt water). any recommendation/suggestion from this group. thanks chris __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [Repeater-Builder] Repeater on Portable Radios
Ron: thanks for the heads-up...I am just listing what we have in the form of donationwe can deviate from using what we now have and recourse to whatever is recommended and within my personal funds (shallow pocket). I have surfed the net on repeater maker but haven't identified a unit that would work for us and within my budget. thanks chris Ron Wright [EMAIL PROTECTED] wrote: Chris, One note...never, never, never use 9913 for a repeater, even if no duplexer and using separate antennas which sounds as if you are going to do. 9913 and any coax that had different metals for the outer shield (9913 has foil and braid). It can generate noise from the transmitter that will interfere with the receiver. This also goes for cable like LM400. If you want to use a coax use something like RG214 or if you can get 1/2 hardline. For the controller sounds as if you are trying to use get input/key tx. Wonder if you are going to use an IDer??? Might also consider some type of remote control, but your application might have a control op at the repeater when in op. 73, ron, n9ee/r From: chris Inos Date: 2007/10/18 Thu PM 02:03:46 CDT To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Repeater on Portable Radios For our American Red Cross use...local chapter We are in a project to make a simple repeater from two IC H-16 VHF (donation) to assist us in our immediate response in a small community (outside of continental U.S.). 1. We are looking for a simple controller, no bells and whistles,, just the cables coming out of the controller and plugged into the audio/ptt to activte the repeater. We would like to have this controller encased. We now have the following: a. 9913 coaxial cable b. solar panels c. auto batteries d. access to 200 ft. tower e. station master cellwave antennae 1. We do not intend to use duplexer. aa. the ic- h 16 would be primary repeater. bb. we are using Ht-600/mt-1000 portables cc. we are always looking out to purchase (shallow pocket) ht-600/mt-1000 vhf...proven to be a workhorse in our harsh salty environment (island close to salt water). any recommendation/suggestion from this group. thanks chris __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome. Yahoo! Groups Links __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
[Repeater-Builder] painting antenna
would like to paint a cellwave stationmaster...any recommendation as to what would be a fitting paint and where to procure it? thanks chris Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ countries) for 2¢/min or less. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] repeater..activate without tones
people from avionics are quick to come to the rescue for someone looking for help..and not spend times with "Unpallatable Dry Jokes" Chris Honolulu, HawaiiChris: Lucky you. :-)Joe M. 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 of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ Yahoo! Personals Single? There's someone we'd like you to meet. Lots of someones, actually. Try Yahoo! Personals YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] repeater..activate without tones
JOE:I am toying around with the repeater-maker "SR4-D". I have this equipment now for more than 15 years. Is sleeps and can be awaken by certain command... csiJoe [EMAIL PROTECTED] wrote: I guess my question would be: Why pick this means of control when there are so many other better ways?chris_inos wrote: can one remotely activate a repeater without tones? Say: click PTT three times within 3 seconds and repeater is up. click PTT four times within 3 seconda dn repeater is down 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 of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ Yahoo! DSL Something to write home about. Just $16.99/mo. or less Yahoo! Music Unlimited - Access over 1 million songs. Try it free. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] repeater..activate without tones
Joe M. I do not think so...this is a well control group...something like one big family ...not more than 10 users...each one look-out for the other.. outside the continental us...in an island of 3000 people. thanks for your contribution. csimch [EMAIL PROTECTED] wrote: I imagine the kerchunkers would have a ball playing with that!In the middle of a conversation, they would shut the repeater off.Joe M.chris_inos wrote: can one remotely activate a repeater without tones? Say: click PTT three times within 3 seconds and repeater is up.click PTT four times within 3 seconda dn repeater is down thanks csi Yahoo! Groups LinksYahoo! 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 of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ Yahoo! Music Unlimited - Access over 1 million songs. Try it free. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
