Thanks Bill! I was initially curious because I have a few Microwave Test equipment pieces here in the shop that I have no idea what to do with. Specifically a 6GHz Pre-Amp and a Vintage Motorola Microwave Modulation Tester. (Not sure what freqs the tester handles. Need to look again).
John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn ----- Original Message ----- From: Bill Smith To: [email protected] Sent: Wednesday, May 12, 2010 11:26 AM Subject: Re: [Repeater-Builder] Just curious... Microwave frequencies Microwave is having a resurgence in popularity. with the demand for wireless data increasing and cellular networks becoming all digital, Microwave is being used where it will be cost-prohibitive to install fiber. Companies like Fiber Tower are providing microwave backhaul for some cellular companies and instead of paying tens or even hundreds of thousands to pull in fiber, they throw in a microwave link for $10,000-$15,000. The microwave equipment of today is nothing like it used to be. The 11 GHz links I have are tower mounted radios and bolt right onto the back of the dish. They have four separate radios built in for redundancy and only need a single cat-5 cable to feed power and signal to them. ------------------------------------------------------------------------------ From: La Rue Communications <[email protected]> To: [email protected] Sent: Wed, May 12, 2010 11:50:28 AM Subject: Re: [Repeater-Builder] Just curious... Microwave frequencies So in a nutshell, microwave is a band of precision and pinpoint accuracy? Common sense that people shouldnt use wood for anything outside that demands long-term stability. Not only do the elements cause warping, but also prone to termites, etc. Wow! Thanks for all the good input! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn ----- Original Message ----- From: DCFluX To: [email protected] Sent: Wednesday, May 12, 2010 9:43 AM Subject: Re: [Repeater-Builder] Just curious... Microwave frequencies Generally microwave is used for point to point communications such as intercity links for telephone and studio to transmitter links for television and radio stations. The power generated by the transmitter is fairly low in the 10-100mW range but the antenna gain of a dish is extremely high 30-40dB depending on frequency and size of the dish, making a 100mW transmitter have an ERP that is 100 - 1000W. With that being said it is probably not a good idea to hang around the appreture of the dish while one of these systems is running. These frequencies are a challange because of the water vapor and rain really like to absorb them and with antenna gain that high the beam width is extremely narrow. I have a 6ft cookie that is .8 degrees wide. Longest path I saw was 65 miles on 12 GHz, had 15 foot dishes on both ends. Normal towers have a tendency to twist depending on wind and temperature variations so its a good idea to mount the dishes with super thick poles directly into the ground with concrete. The local cable company put a system on 24 GHz that went 1 mile. worked great until it rained and got humid, they mounted the dishes on wooden phone poles and they twisted to the point where the link quit working. On Wed, May 12, 2010 at 9:32 AM, La Rue Communications <laruec...@gmail. com> wrote: With that being said, how popular is the rest of the microwave band? Is it one of the more dangerous bands if used improperly? John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl. com/2dtngmn ----- Original Message ----- From: DCFluX To: Repeater-Builder@ yahoogroups. com Sent: Wednesday, May 12, 2010 9:27 AM Subject: Re: [Repeater-Builder] Just curious... Microwave frequencies No 800 band for hams, closest is 902-928 which is the 33cm ham band, it is also used by ISM type devices such as cordless phones, baby monitors, 802.11 internet and wireless video senders. 10 S. Aurora Street Stockton, CA 95202 http://tinyurl. com/2dtngmn
