Re: [Elecraft] 144XV construction experience?
I have preamps on multiple VHF and UHF antennas on the same tower mast. All preamps are powered off together by a master sequencer so if I transmit on one band all others are off. The TR relays also are switched at the same time disconnecting all preamps from their antennas when any one band is in transmit. Exception are the HF antennas and two VHF antennas that are used on FM (only one has an in-line preamp which is RF switched). I run 1300w on the eme array (ERP=135 kW) which is about 130-feet away with no issues observed. The two antennas point at each other when the Moon is in a particular position (az=235) but Moon is usually elevated above the FM antenna (a yagi) by about 30-degrees so RF is down about 25-dB in the direction of the FM antenna. Space loss for 130-feet lowers RF to a non-damaging level for receiving devices (which I consider < 0 dBm). Interestingly, the personnel RF safe zone on-axis for the 2m eme signal is 75.52m (247-feet). But it is safe at head height directly under the eme tower which is 13.7m (50-foot). I would not transmit when anyone climbed the other tower. A very nice program called EMRCalc is available from VK3UM to evaluate RF safety zones from your antenna. 73, Ed - KL7UW --- From: Don Wilhelm To: elecraft@mailman.qth.net Subject: Re: [Elecraft] 144XV construction experience? Message-ID: <52be5f5a.20...@embarqmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed That caution is not restricted to the Elecraft XV series transverters, but is appropriate for any receiver that uses sensitive devices for the receiver front end. The XV series uses the AT F 34143 for the preamp front end. Yes, that is a sensitive device that can be damaged by high RF input. It is prudent to use means to protect that front end from excessive RF from other nearby transmitters whether that be an Elecraft product or any other brand. 73, Don W3FPR 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubus...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 144XV construction experience?
That caution is not restricted to the Elecraft XV series transverters, but is appropriate for any receiver that uses sensitive devices for the receiver front end. The XV series uses the AT F 34143 for the preamp front end. Yes, that is a sensitive device that can be damaged by high RF input. It is prudent to use means to protect that front end from excessive RF from other nearby transmitters whether that be an Elecraft product or any other brand. 73, Don W3FPR On 12/27/2013 4:23 PM, Lloyd Korb wrote: Allan, I am in the process of building the 222 version. Just a word of warning that I received in an email from Elecraft. Now, the caution about disconnecting the antenna when transmitting close to the 222 antenna is going to be a real PITA when working the contests! Removing during lightning storms is a no brainer! __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 144XV construction experience?
Allan, I am in the process of building the 222 version. Just a word of warning that I received in an email from Elecraft. Now, the caution about disconnecting the antenna when transmitting close to the 222 antenna is going to be a real PITA when working the contests! Removing during lightning storms is a no brainer! 73, Lloyd K8DIO *One tip:The RF module usually has a depression in the middle, so if you trim the thermal pad with scissors so it just fits within that depression, it makes for a better clamping and improved heat transfer. Do not exceed 20w of RF output, and disconnect the antenna when lighting storms approach or if you will be transmitting close to the XV222 antenna with another rig.* On Fri, Dec 27, 2013 at 11:11 AM, Don Wilhelm wrote: > Follow the instructions in the manual and you will be successful. Do the > steps in order. > Do not mix up the shielded inductors is the only specific warning that I > can offer. I have built many of the XV transverters. > > 73, > Don W3FPR > > > On 12/27/2013 9:55 AM, Allan Taylor wrote: > >> I am about to begin the build of a 144XV transverter. Before I venture >> forth, >> though, I would like to request the advice of those here who have built >> this >> 2m transverter. Any specific warnings that apply to it? I have just >> completed >> the install of the K60XV mod / kit so that work on the K2 is already done. >> >> > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] 144XV construction experience?
Follow the instructions in the manual and you will be successful. Do the steps in order. Do not mix up the shielded inductors is the only specific warning that I can offer. I have built many of the XV transverters. 73, Don W3FPR On 12/27/2013 9:55 AM, Allan Taylor wrote: I am about to begin the build of a 144XV transverter. Before I venture forth, though, I would like to request the advice of those here who have built this 2m transverter. Any specific warnings that apply to it? I have just completed the install of the K60XV mod / kit so that work on the K2 is already done. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] 144XV construction experience?
I am about to begin the build of a 144XV transverter. Before I venture forth, though, I would like to request the advice of those here who have built this 2m transverter. Any specific warnings that apply to it? I have just completed the install of the K60XV mod / kit so that work on the K2 is already done. -- 73 AllanK7GT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
