Repeater desense test

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Sumoto pumpe deloviSo this desense problem is present both at my home test location and the repeater site. My thoughts are that the ham grade antennas on my home tower and repeater tower are not duplexing well. My next step is to acquire some good Andrew Heliax and some type of commercial grade antenna (such as a DB-224e) and to try and make it work at my home. With the transmitter still connected to the dummy, and receiver hearing a weak signal, you should be able to turn on and off the transmitter with no change in receiver quieting. This step tests for internal repeater desense. If this test fails, the repeater itself needs work to get rid of all internal desense. >>Does anyone have any information on techniques for measuring receiver >>desense? >>I am looking for a means to measure the effects of a laptop computer >>operating in close proximity to 400MHz FM voice and 800MHz data >>radios. Access to equipment (sig generators, spectrum analyzers, >>etc.) is not a problem. May 15, 2019 · During our May repeater work day, George (WBØIIS) led a group of committee members to help test for repeater desense. After connecting the repeater to a communications service monitor we were able to recreate the chopping issue pretty reliably. area of the repeater’s receiver is effectively reduced by RF from the blocking source. Effects to LMR trunked repeaters are similar, but will typically manifest as deflected calls, where the subscriber unit won’t give the go-ahead signal to the user despite being in coverage and the system being unloaded.

Suppose that the output of a repeater is 100W (50dBm) and that the isotee provides 35dB of isolation. This means that the RF level getting into the attenuator pad is 50 – 35 = 15dBm. Be sure that the signal generator or pad can handle this power level. If not, you must provide more isolation. With the transmitter still connected to the dummy, and receiver hearing a weak signal, you should be able to turn on and off the transmitter with no change in receiver quieting. This step tests for internal repeater desense. If this test fails, the repeater itself needs work to get rid of all internal desense.

  • Helwan brigadier 9mm magazinesOnce Upon a California Hilltop The story of repeater pioneer Art Gentry, W6MEP. (FM) would solve the noise problems for VHF/UHF mobile operators. A device that was new to Amateur Radio would solve the range issue. One of its earliest appearances was in a blockhouse just above the famed “Hollywood” sign over-looking Los Angeles. It was a ... receiver and key the transmitter. If there is any desense you need better shielding. reconnect the transmitter and connect the receiver input to a Next , shielded signal generator. Repeat the test. There should be no desense. either of these tests fail, don't waste time on other experiments until the shielding is improved and these tests are passed.
  • May 26, 2012 · How do I check if my wireless repeater is working or not ? Im using ASUS WL-330N3G in Repeater mode. > potentially leading to a fixable desense situation, by retuning the duplexer and making > certain both the RX and TX ports still represent 50 ohms resistive to the duplexer. The duplexer should have been aligned with a network analyzer (if you have access to one) on a 50 ohm system impedance (most cases).
  • Pesterchum download iphoneRepeat sensitivity test with Antenna connected (Connect to duplexer RX port) With the antenna, the sensitivity is degraded by the antenna noise present.

To test the system performance (repeater and/or base station's sensitivity) you can perform the following tests as (partially) shown in figure 3. Two test are involved, one, site (noise) degradation, and, two, repeater degradation (Tx-Rx). Both tests check desense of the station's receiver. Aug 18, 2015 · This video is part of the series in which I show some of the things I encountered while building a ham radio repeater. The whole series is available here: ht... Once Upon a California Hilltop The story of repeater pioneer Art Gentry, W6MEP. (FM) would solve the noise problems for VHF/UHF mobile operators. A device that was new to Amateur Radio would solve the range issue. One of its earliest appearances was in a blockhouse just above the famed “Hollywood” sign over-looking Los Angeles. It was a ...

So this desense problem is present both at my home test location and the repeater site. My thoughts are that the ham grade antennas on my home tower and repeater tower are not duplexing well. My next step is to acquire some good Andrew Heliax and some type of commercial grade antenna (such as a DB-224e) and to try and make it work at my home. Jun 22, 2014 · Repeater Desense: In addition to the receiver’s effective sensitivity test, it is always a good idea to check for desense of the receiver caused by the repeater’s own transmitter or other transmitters at the site. This is done by generating a signal into the iso-tee (still in the receive line from the duplexer) and leaving the transmitter off. Understanding Repeater Site Interference Presented by: Jay M. Jacobsmeyer, P.E. Pericle Communications Company 1910 Vindicator Drive, Suite 100 Colorado Springs, CO 80919 (719) 548-1040 [email protected] IWCE 2010 - Test & Measurement 101 Understanding Repeater Site Interference Presented by: Jay M. Jacobsmeyer, P.E. Pericle Communications Company 1910 Vindicator Drive, Suite 100 Colorado Springs, CO 80919 (719) 548-1040 [email protected] IWCE 2010 - Test & Measurement 101 3524 ic inverterMar 29, 2003 · Tracking down Cable TV leakage interference to public safety repeater radio systems 29 March, 2003. The times I get called for a wireless system problem are not easy problems, because you can get someone else to do the easy calls at half my price. So this desense problem is present both at my home test location and the repeater site. My thoughts are that the ham grade antennas on my home tower and repeater tower are not duplexing well. My next step is to acquire some good Andrew Heliax and some type of commercial grade antenna (such as a DB-224e) and to try and make it work at my home. After putting both repeaters through this same test, I had the desired numbers at hand. I already knew that the differences between the Mastr II and Fusion would be noticeable, but they turned out to be a bit more so than I had suspected. The Fusion repeater would totally desense with unwanted transmitter signal power of 4.77 uW. Once Upon a California Hilltop The story of repeater pioneer Art Gentry, W6MEP. (FM) would solve the noise problems for VHF/UHF mobile operators. A device that was new to Amateur Radio would solve the range issue. One of its earliest appearances was in a blockhouse just above the famed “Hollywood” sign over-looking Los Angeles. It was a ...

So this desense problem is present both at my home test location and the repeater site. My thoughts are that the ham grade antennas on my home tower and repeater tower are not duplexing well. My next step is to acquire some good Andrew Heliax and some type of commercial grade antenna (such as a DB-224e) and to try and make it work at my home. Jan 07, 2020 · After putting both repeaters through this same test, I had the desired numbers at hand. I already knew that the differences between the Mastr II and Fusion would be noticeable, but they turned out to be a bit more so than I had suspected. The Fusion repeater would totally desense with unwanted transmitter signal power of 4.77 uW.

Mar 29, 2003 · Tracking down Cable TV leakage interference to public safety repeater radio systems 29 March, 2003. The times I get called for a wireless system problem are not easy problems, because you can get someone else to do the easy calls at half my price. When locating multiple stations at a single site, several precautions must be taken to guard against interference to all stations at the site. Among the factors that must be considered are transmitter noise and receiver desensitization (desense). There are tools that can be used to calculate and solve transmitter noise and receiver desense problems. Understanding Repeater Site Interference Presented by: Jay M. Jacobsmeyer, P.E. Pericle Communications Company 1910 Vindicator Drive, Suite 100 Colorado Springs, CO 80919 (719) 548-1040 [email protected] IWCE 2010 - Test & Measurement 101 May 06, 2014 · Frequency –First you need to program in the frequency of the repeater you want to access. The actual key strokes or knob turns will depend on the particular model of radio so consult your operating manual. The frequency you enter is the repeater transmit frequency which will be your receive frequency. May 15, 2019 · During our May repeater work day, George (WBØIIS) led a group of committee members to help test for repeater desense. After connecting the repeater to a communications service monitor we were able to recreate the chopping issue pretty reliably.

With the transmitter still connected to the dummy, and receiver hearing a weak signal, you should be able to turn on and off the transmitter with no change in receiver quieting. This step tests for internal repeater desense. If this test fails, the repeater itself needs work to get rid of all internal desense. Baofeng UV-5R Notes (BFS311 Firmware) Test Unit. Baofeng UV-5R (purchased new in 2013) Firmware BFS311 130903N; S/N US201311**** S/N may also be a date code. Unit was purchased in 11/2013 and may have been manufactured the same month. Battery Saver. When Menu 3 SAVE is enabled, the receiver is periodically turned off to reduce power consumption. Understanding Repeater Site Interference Presented by: Jay M. Jacobsmeyer, P.E. Pericle Communications Company 1910 Vindicator Drive, Suite 100 Colorado Springs, CO 80919 (719) 548-1040 [email protected] IWCE 2010 - Test & Measurement 101

Jan 21, 2007 · the test is repeated, but this time transmitting while measuring SINAD (if the device under test is a repeater or full-duplex device). The increase in signal generator level over that required to overcome ambient noise is the amount of desense created by the transmitter. Jun 22, 2014 · Repeater Desense: In addition to the receiver’s effective sensitivity test, it is always a good idea to check for desense of the receiver caused by the repeater’s own transmitter or other transmitters at the site. This is done by generating a signal into the iso-tee (still in the receive line from the duplexer) and leaving the transmitter off. Understanding Repeater Site Interference Presented by: Jay M. Jacobsmeyer, P.E. Pericle Communications Company 1910 Vindicator Drive, Suite 100 Colorado Springs, CO 80919 (719) 548-1040 [email protected] IWCE 2010 - Test & Measurement 101

Feb 06, 2019 · Tutorial on testing receiver sensitivity using a SINAD meter and two way radio. If you like this video, please subscribe to my channel. Repeater desense measurements Another benefit of using the lossy T is to compute transmitter-induced noise in a repeater system. Again, with the setup shown in Figure 3, measure the receiver sensitivity with the repeater transmitter disabled. Note this level. Now, while leaving the setup the same, turn on the transmitter. Jan 07, 2020 · After putting both repeaters through this same test, I had the desired numbers at hand. I already knew that the differences between the Mastr II and Fusion would be noticeable, but they turned out to be a bit more so than I had suspected. The Fusion repeater would totally desense with unwanted transmitter signal power of 4.77 uW. With the transmitter still connected to the dummy, and receiver hearing a weak signal, you should be able to turn on and off the transmitter with no change in receiver quieting. This step tests for internal repeater desense. If this test fails, the repeater itself needs work to get rid of all internal desense.

Subject: Re: [repeater-builder] Polyphaser Desense I've tested hundreds of Polyphasors when I worked at Nextel during routine antenna testing and the test failure was poor return loss. The Polyphasor would still pass signals, but the Return loss would be less than 30dB. > potentially leading to a fixable desense situation, by retuning the duplexer and making > certain both the RX and TX ports still represent 50 ohms resistive to the duplexer. The duplexer should have been aligned with a network analyzer (if you have access to one) on a 50 ohm system impedance (most cases). Remember the repeater will have to work in more places than just a test bench. The other half of the repeater system is the transmitter. Advances in the design of transmitter exciters and power amplifiers have created transmission that is clean and free of harmonics and spurious noise, while maintaining high stability.

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